Open auto-closeable resources in try-with-resource

When an auto-closeable resources is not opened in try-with-resource,
the warning "should be managed by try-with-resource" is emitted by
Eclipse.

Fix the ones that can be silenced simply by moving the declaration of
the variable into a try-with-resource.

In cases where we explicitly call the close() method, for example in
tests where we are testing specific behavior caused by the close(),
suppress the warning.

Leave the ones that will require more significant refcactoring to fix.
They can be done in separate commits that can be reviewed and tested
in isolation.

Change-Id: I9682cd20fb15167d3c7f9027cecdc82bc50b83c4
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/ServletUtils.java

@@ -220,12 +220,9 @@ public final class ServletUtils {
 	public static void send(byte[] content, final HttpServletRequest req,
 			final HttpServletResponse rsp) throws IOException {
 		content = sendInit(content, req, rsp);
-		final OutputStream out = rsp.getOutputStream();
-		try {
+		try (OutputStream out = rsp.getOutputStream()) {
 			out.write(content);
 			out.flush();
-		} finally {
-			out.close();
 		}
 	}
 

org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/SmartOutputStream.java

@@ -110,11 +110,8 @@ class SmartOutputStream extends TemporaryBuffer {
 			if (256 < out.length() && acceptsGzipEncoding(req)) {
 				TemporaryBuffer gzbuf = new TemporaryBuffer.Heap(LIMIT);
 				try {
-					GZIPOutputStream gzip = new GZIPOutputStream(gzbuf);
-					try {
+					try (GZIPOutputStream gzip = new GZIPOutputStream(gzbuf)) {
 						out.writeTo(gzip, null);
-					} finally {
-						gzip.close();
 					}
 					if (gzbuf.length() < out.length()) {
 						out = gzbuf;
@@ -131,12 +128,9 @@ class SmartOutputStream extends TemporaryBuffer {
 			// hardcoded LIMIT constant above assures us we wouldn't store
 			// more than 2 GiB of content in memory.
 			rsp.setContentLength((int) out.length());
-			final OutputStream os = rsp.getOutputStream();
-			try {
+			try (OutputStream os = rsp.getOutputStream()) {
 				out.writeTo(os, null);
 				os.flush();
-			} finally {
-				os.close();
 			}
 		}
 	}

org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/ProtocolErrorTest.java

@@ -149,19 +149,15 @@ public class ProtocolErrorTest extends HttpTestCase {
 			c.setRequestProperty("Content-Type",
 					GitSmartHttpTools.RECEIVE_PACK_REQUEST_TYPE);
 			c.setFixedLengthStreamingMode(reqbin.length);
-			OutputStream out = c.getOutputStream();
-			try {
+			try (OutputStream out = c.getOutputStream()) {
 				out.write(reqbin);
-			} finally {
-				out.close();
 			}
 
 			assertEquals(200, c.getResponseCode());
 			assertEquals(GitSmartHttpTools.RECEIVE_PACK_RESULT_TYPE,
 					c.getContentType());
 
-			InputStream rawin = c.getInputStream();
-			try {
+			try (InputStream rawin = c.getInputStream()) {
 				PacketLineIn pckin = new PacketLineIn(rawin);
 				assertEquals("unpack error "
 						+ JGitText.get().packfileIsTruncatedNoParam,
@@ -169,8 +165,6 @@ public class ProtocolErrorTest extends HttpTestCase {
 				assertEquals("ng refs/objects/A n/a (unpacker error)",
 						pckin.readString());
 				assertSame(PacketLineIn.END, pckin.readString());
-			} finally {
-				rawin.close();
 			}
 		} finally {
 			c.disconnect();

org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SetAdditionalHeadersTest.java

@@ -107,8 +107,7 @@ public class SetAdditionalHeadersTest extends HttpTestCase {
 
 		assertEquals("http", remoteURI.getScheme());
 
-		Transport t = Transport.open(dst, remoteURI);
-		try {
+		try (Transport t = Transport.open(dst, remoteURI)) {
 			assertTrue("isa TransportHttp", t instanceof TransportHttp);
 			assertTrue("isa HttpTransport", t instanceof HttpTransport);
 
@@ -117,8 +116,6 @@ public class SetAdditionalHeadersTest extends HttpTestCase {
 			headers.put("AnotherKey", "someValue");
 			((TransportHttp) t).setAdditionalHeaders(headers);
 			t.openFetch();
-		} finally {
-			t.close();
 		}
 
 		List<AccessEvent> requests = getRequests();

org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SmartClientSmartServerTest.java

@@ -267,9 +267,9 @@ public class SmartClientSmartServerTest extends HttpTestCase {
 				final HttpServletResponse r = (HttpServletResponse) response;
 				r.setContentType("text/plain");
 				r.setCharacterEncoding("UTF-8");
-				PrintWriter w = r.getWriter();
+				try (PrintWriter w = r.getWriter()) {
 					w.print("OK");
-				w.close();
+				}
 			}
 
 			@Override
@@ -397,11 +397,8 @@ public class SmartClientSmartServerTest extends HttpTestCase {
 			assertTrue("isa TransportHttp", t instanceof TransportHttp);
 			assertTrue("isa HttpTransport", t instanceof HttpTransport);
 
-			FetchConnection c = t.openFetch();
-			try {
+			try (FetchConnection c = t.openFetch()) {
 				map = c.getRefsMap();
-			} finally {
-				c.close();
 			}
 		}
 

org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java

@@ -94,20 +94,13 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 	 */
 	protected static void copyFile(final File src, final File dst)
 			throws IOException {
-		final FileInputStream fis = new FileInputStream(src);
-		try {
-			final FileOutputStream fos = new FileOutputStream(dst);
-			try {
+		try (FileInputStream fis = new FileInputStream(src);
+				FileOutputStream fos = new FileOutputStream(dst)) {
 			final byte[] buf = new byte[4096];
 			int r;
 			while ((r = fis.read(buf)) > 0) {
 				fos.write(buf, 0, r);
 			}
-			} finally {
-				fos.close();
-			}
-		} finally {
-			fis.close();
 		}
 	}
 
@@ -293,10 +286,11 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 				dce.setFileMode(treeItr.getEntryFileMode());
 				dce.setLastModified(treeItr.getEntryLastModified());
 				dce.setLength((int) len);
-				FileInputStream in = new FileInputStream(
-						treeItr.getEntryFile());
-				dce.setObjectId(inserter.insert(Constants.OBJ_BLOB, len, in));
-				in.close();
+				try (FileInputStream in = new FileInputStream(
+						treeItr.getEntryFile())) {
+					dce.setObjectId(
+							inserter.insert(Constants.OBJ_BLOB, len, in));
+				}
 				builder.add(dce);
 				treeItr.next(1);
 			}
@@ -380,8 +374,9 @@ public abstract class RepositoryTestCase extends LocalDiskRepositoryTestCase {
 			while (actTime <= startTime) {
 				Thread.sleep(sleepTime);
 				sleepTime *= 2;
-				FileOutputStream fos = new FileOutputStream(tmp);
-				fos.close();
+				try (FileOutputStream fos = new FileOutputStream(tmp)) {
+					// Do nothing
+				}
 				actTime = fs.lastModified(tmp);
 			}
 			return actTime;

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Version.java

@@ -96,14 +96,9 @@ class Version extends TextBuiltin {
 	}
 
 	private static String getBundleVersion(URL url) {
-		try {
-			InputStream is = url.openStream();
-			try {
+		try (InputStream is = url.openStream()) {
 			Manifest manifest = new Manifest(is);
 			return manifest.getMainAttributes().getValue("Bundle-Version"); //$NON-NLS-1$
-			} finally {
-				is.close();
-			}
 		} catch (IOException e) {
 			// do nothing - will return null
 		}

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/TextHashFunctions.java

@@ -288,11 +288,8 @@ class TextHashFunctions extends TextBuiltin {
 			else
 				rb.findGitDir(dir);
 
-			Repository repo = rb.build();
-			try {
+			try (Repository repo = rb.build()) {
 				run(repo);
-			} finally {
-				repo.close();
 			}
 		}
 	}

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ResetCommandTest.java

@@ -100,39 +100,39 @@ public class ResetCommandTest extends RepositoryTestCase {
 		File nestedFile = new File(dir, "b.txt");
 		FileUtils.createNewFile(nestedFile);
 
-		PrintWriter nesterFileWriter = new PrintWriter(nestedFile);
-		nesterFileWriter.print("content");
-		nesterFileWriter.flush();
+		try (PrintWriter nestedFileWriter = new PrintWriter(nestedFile)) {
+			nestedFileWriter.print("content");
+			nestedFileWriter.flush();
 
 			// create file
 			indexFile = new File(db.getWorkTree(), "a.txt");
 			FileUtils.createNewFile(indexFile);
-		PrintWriter writer = new PrintWriter(indexFile);
+			try (PrintWriter writer = new PrintWriter(indexFile)) {
 				writer.print("content");
 				writer.flush();
 
 				// add file and commit it
 				git.add().addFilepattern("dir").addFilepattern("a.txt").call();
-		secondCommit = git.commit().setMessage("adding a.txt and dir/b.txt")
-				.call();
+				secondCommit = git.commit()
+						.setMessage("adding a.txt and dir/b.txt").call();
 
-		prestage = DirCache.read(db.getIndexFile(), db.getFS()).getEntry(
-				indexFile.getName());
+				prestage = DirCache.read(db.getIndexFile(), db.getFS())
+						.getEntry(indexFile.getName());
 
 				// modify file and add to index
 				writer.print("new content");
-		writer.close();
-		nesterFileWriter.print("new content");
-		nesterFileWriter.close();
+			}
+			nestedFileWriter.print("new content");
+		}
 		git.add().addFilepattern("a.txt").addFilepattern("dir").call();
 
 		// create a file not added to the index
 		untrackedFile = new File(db.getWorkTree(),
 				"notAddedToIndex.txt");
 		FileUtils.createNewFile(untrackedFile);
-		PrintWriter writer2 = new PrintWriter(untrackedFile);
+		try (PrintWriter writer2 = new PrintWriter(untrackedFile)) {
 			writer2.print("content");
-		writer2.close();
+		}
 	}
 
 	@Test

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/PackFileTest.java

@@ -146,7 +146,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 		assertFalse("is not large", ol.isLarge());
 		assertTrue("same content", Arrays.equals(data, ol.getCachedBytes()));
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
@@ -154,7 +154,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 			IO.readFully(in, data2, 0, data.length);
 			assertTrue("same content", Arrays.equals(data2, data));
 			assertEquals("stream at EOF", -1, in.read());
-		in.close();
+		}
 	}
 
 	@Test
@@ -180,7 +180,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 					.getMessage());
 		}
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
@@ -188,7 +188,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 			IO.readFully(in, data2, 0, data.length);
 			assertTrue("same content", Arrays.equals(data2, data));
 			assertEquals("stream at EOF", -1, in.read());
-		in.close();
+		}
 	}
 
 	@Test
@@ -239,7 +239,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 			assertNotNull(ol.getCachedBytes());
 			assertArrayEquals(data3, ol.getCachedBytes());
 
-			ObjectStream in = ol.openStream();
+			try (ObjectStream in = ol.openStream()) {
 				assertNotNull("have stream", in);
 				assertEquals(Constants.OBJ_BLOB, in.getType());
 				assertEquals(data3.length, in.getSize());
@@ -247,7 +247,7 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 				IO.readFully(in, act, 0, data3.length);
 				assertTrue("same content", Arrays.equals(act, data3));
 				assertEquals("stream at EOF", -1, in.read());
-			in.close();
+			}
 		}
 	}
 
@@ -282,22 +282,16 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 			File packName = new File(dir, idA.name() + ".pack");
 			File idxName = new File(dir, idA.name() + ".idx");
 
-			FileOutputStream f = new FileOutputStream(packName);
-			try {
+			try (FileOutputStream f = new FileOutputStream(packName)) {
 				f.write(pack.toByteArray());
-			} finally {
-				f.close();
 			}
 
-			f = new FileOutputStream(idxName);
-			try {
+			try (FileOutputStream f = new FileOutputStream(idxName)) {
 				List<PackedObjectInfo> list = new ArrayList<>();
 				list.add(a);
 				list.add(b);
 				Collections.sort(list);
 				new PackIndexWriterV1(f).write(list, footer);
-			} finally {
-				f.close();
 			}
 
 			PackFile packFile = new PackFile(packName, PackExt.INDEX.getBit());
@@ -321,17 +315,18 @@ public class PackFileTest extends LocalDiskRepositoryTestCase {
 		assertTrue("has blob", wc.has(id));
 
 		ObjectLoader ol = wc.open(id);
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertTrue(in instanceof ObjectStream.SmallStream);
 			assertEquals(300, in.available());
-		in.close();
+		}
 
 		wc.setStreamFileThreshold(299);
 		ol = wc.open(id);
-		in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertTrue(in instanceof ObjectStream.Filter);
 			assertEquals(1, in.available());
 		}
+	}
 
 	private static byte[] clone(int first, byte[] base) {
 		byte[] r = new byte[base.length];

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/PackWriterTest.java

@@ -515,11 +515,8 @@ public class PackWriterTest extends SampleDataRepositoryTestCase {
 
 		// Validate that an index written by PackWriter is the same.
 		final File idx2File = new File(indexFile.getAbsolutePath() + ".2");
-		final FileOutputStream is = new FileOutputStream(idx2File);
-		try {
+		try (FileOutputStream is = new FileOutputStream(idx2File)) {
 			writer.writeIndex(is);
-		} finally {
-			is.close();
 		}
 		final PackIndex idx2 = PackIndex.open(idx2File);
 		assertTrue(idx2 instanceof PackIndexV2);
@@ -715,14 +712,14 @@ public class PackWriterTest extends SampleDataRepositoryTestCase {
 			String id = pw.computeName().getName();
 			File packdir = repo.getObjectDatabase().getPackDirectory();
 			File packFile = new File(packdir, "pack-" + id + ".pack");
-			FileOutputStream packOS = new FileOutputStream(packFile);
+			try (FileOutputStream packOS = new FileOutputStream(packFile)) {
 				pw.writePack(NullProgressMonitor.INSTANCE,
 						NullProgressMonitor.INSTANCE, packOS);
-			packOS.close();
+			}
 			File idxFile = new File(packdir, "pack-" + id + ".idx");
-			FileOutputStream idxOS = new FileOutputStream(idxFile);
+			try (FileOutputStream idxOS = new FileOutputStream(idxFile)) {
 				pw.writeIndex(idxOS);
-			idxOS.close();
+			}
 			return PackIndex.open(idxFile);
 		}
 	}

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java

@@ -137,10 +137,10 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 	@Test
 	public void test000_openrepo_default_gitDirSet() throws IOException {
 		File repo1Parent = new File(trash.getParentFile(), "r1");
-		Repository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (Repository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
 		FileRepository r = (FileRepository) new FileRepositoryBuilder()
@@ -162,10 +162,10 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 	public void test000_openrepo_default_gitDirAndWorkTreeSet()
 			throws IOException {
 		File repo1Parent = new File(trash.getParentFile(), "r1");
-		Repository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (Repository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
 		FileRepository r = (FileRepository) new FileRepositoryBuilder()
@@ -187,10 +187,10 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 	@Test
 	public void test000_openrepo_default_workDirSet() throws IOException {
 		File repo1Parent = new File(trash.getParentFile(), "r1");
-		Repository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (Repository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
 		FileRepository r = (FileRepository) new FileRepositoryBuilder()
@@ -213,13 +213,13 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 		File repo1Parent = new File(trash.getParentFile(), "r1");
 		File workdir = new File(trash.getParentFile(), "rw");
 		FileUtils.mkdir(workdir);
-		FileRepository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (FileRepository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
 			final FileBasedConfig cfg = repo1initial.getConfig();
 			cfg.setString("core", null, "worktree", workdir.getAbsolutePath());
 			cfg.save();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
 		FileRepository r = (FileRepository) new FileRepositoryBuilder()
@@ -242,13 +242,13 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 		File repo1Parent = new File(trash.getParentFile(), "r1");
 		File workdir = new File(trash.getParentFile(), "rw");
 		FileUtils.mkdir(workdir);
-		FileRepository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (FileRepository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
 			final FileBasedConfig cfg = repo1initial.getConfig();
 			cfg.setString("core", null, "worktree", "../../rw");
 			cfg.save();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
 		FileRepository r = (FileRepository) new FileRepositoryBuilder()
@@ -273,26 +273,24 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 		File indexFile = new File(trash, "idx");
 		File objDir = new File(trash, "../obj");
 		File altObjDir = db.getObjectDatabase().getDirectory();
-		Repository repo1initial = new FileRepository(new File(repo1Parent,
-				Constants.DOT_GIT));
+		try (Repository repo1initial = new FileRepository(
+				new File(repo1Parent, Constants.DOT_GIT))) {
 			repo1initial.create();
-		repo1initial.close();
+		}
 
 		File theDir = new File(repo1Parent, Constants.DOT_GIT);
-		FileRepository r = (FileRepository) new FileRepositoryBuilder() //
+		try (FileRepository r = (FileRepository) new FileRepositoryBuilder() //
 				.setGitDir(theDir).setObjectDirectory(objDir) //
 				.addAlternateObjectDirectory(altObjDir) //
 				.setIndexFile(indexFile) //
-				.build();
+				.build()) {
 			assertEqualsPath(theDir, r.getDirectory());
 			assertEqualsPath(theDir.getParentFile(), r.getWorkTree());
 			assertEqualsPath(indexFile, r.getIndexFile());
 			assertEqualsPath(objDir, r.getObjectDatabase().getDirectory());
 			assertNotNull(r.open(ObjectId
 					.fromString("6db9c2ebf75590eef973081736730a9ea169a0c4")));
-		// Must close or the default repo pack files created by this test gets
-		// locked via the alternate object directories on Windows.
-		r.close();
+		}
 	}
 
 	protected void assertEqualsPath(File expected, File actual)
@@ -417,14 +415,11 @@ public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 		// Verify the commit we just wrote is in the correct format.
 		ObjectDatabase odb = db.getObjectDatabase();
 		assertTrue("is ObjectDirectory", odb instanceof ObjectDirectory);
-		final XInputStream xis = new XInputStream(new FileInputStream(
-				((ObjectDirectory) odb).fileFor(cmtid)));
-		try {
+		try (XInputStream xis = new XInputStream(
+				new FileInputStream(((ObjectDirectory) odb).fileFor(cmtid)))) {
 			assertEquals(0x78, xis.readUInt8());
 			assertEquals(0x9c, xis.readUInt8());
 			assertEquals(0, 0x789c % 31);
-		} finally {
-			xis.close();
 		}
 
 		// Verify we can read it.

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/UnpackedObjectTest.java

@@ -130,7 +130,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		assertFalse("is not large", ol.isLarge());
 		assertTrue("same content", Arrays.equals(data, ol.getCachedBytes()));
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
@@ -138,7 +138,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 			IO.readFully(in, data2, 0, data.length);
 			assertTrue("same content", Arrays.equals(data2, data));
 			assertEquals("stream at EOF", -1, in.read());
-		in.close();
+		}
 	}
 
 	@Test
@@ -150,11 +150,8 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 
 		ObjectLoader ol;
 		{
-			FileInputStream fs = new FileInputStream(path(id));
-			try {
+			try (FileInputStream fs = new FileInputStream(path(id))) {
 				ol = UnpackedObject.open(fs, path(id), id, wc);
-			} finally {
-				fs.close();
 			}
 		}
 
@@ -171,7 +168,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 					.getMessage());
 		}
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
@@ -179,7 +176,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 			IO.readFully(in, data2, 0, data.length);
 			assertTrue("same content", Arrays.equals(data2, data));
 			assertEquals("stream at EOF", -1, in.read());
-		in.close();
+		}
 	}
 
 	@Test
@@ -316,23 +313,13 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		write(id, gz);
 
 		ObjectLoader ol;
-		{
-			FileInputStream fs = new FileInputStream(path(id));
-			try {
+		try (FileInputStream fs = new FileInputStream(path(id))) {
 			ol = UnpackedObject.open(fs, path(id), id, wc);
-			} finally {
-				fs.close();
-			}
 		}
 
-		try {
 		byte[] tmp = new byte[data.length];
-			InputStream in = ol.openStream();
-			try {
+		try (InputStream in = ol.openStream()) {
 			IO.readFully(in, tmp, 0, tmp.length);
-			} finally {
-				in.close();
-			}
 			fail("Did not throw CorruptObjectException");
 		} catch (CorruptObjectException coe) {
 			assertEquals(MessageFormat.format(JGitText.get().objectIsCorrupt,
@@ -354,16 +341,12 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		write(id, tr);
 
 		ObjectLoader ol;
-		{
-			FileInputStream fs = new FileInputStream(path(id));
-			try {
+		try (FileInputStream fs = new FileInputStream(path(id))) {
 			ol = UnpackedObject.open(fs, path(id), id, wc);
-			} finally {
-				fs.close();
-			}
 		}
 
 		byte[] tmp = new byte[data.length];
+		@SuppressWarnings("resource") // We are testing that the close() method throws
 		InputStream in = ol.openStream();
 		IO.readFully(in, tmp, 0, tmp.length);
 		try {
@@ -389,16 +372,12 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		write(id, tr);
 
 		ObjectLoader ol;
-		{
-			FileInputStream fs = new FileInputStream(path(id));
-			try {
+		try (FileInputStream fs = new FileInputStream(path(id))) {
 			ol = UnpackedObject.open(fs, path(id), id, wc);
-			} finally {
-				fs.close();
-			}
 		}
 
 		byte[] tmp = new byte[data.length];
+		@SuppressWarnings("resource") // We are testing that the close() method throws
 		InputStream in = ol.openStream();
 		IO.readFully(in, tmp, 0, tmp.length);
 		try {
@@ -426,14 +405,15 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		assertFalse("is not large", ol.isLarge());
 		assertTrue("same content", Arrays.equals(data, ol.getCachedBytes()));
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
 			byte[] data2 = new byte[data.length];
 			IO.readFully(in, data2, 0, data.length);
-		assertTrue("same content", Arrays.equals(data, ol.getCachedBytes()));
-		in.close();
+			assertTrue("same content",
+					Arrays.equals(data, ol.getCachedBytes()));
+		}
 	}
 
 	@Test
@@ -444,13 +424,8 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 		write(id, compressPackFormat(type, data));
 
 		ObjectLoader ol;
-		{
-			FileInputStream fs = new FileInputStream(path(id));
-			try {
+		try (FileInputStream fs = new FileInputStream(path(id))) {
 			ol = UnpackedObject.open(fs, path(id), id, wc);
-			} finally {
-				fs.close();
-			}
 		}
 
 		assertNotNull("created loader", ol);
@@ -466,7 +441,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 					.getMessage());
 		}
 
-		ObjectStream in = ol.openStream();
+		try (ObjectStream in = ol.openStream()) {
 			assertNotNull("have stream", in);
 			assertEquals(type, in.getType());
 			assertEquals(data.length, in.getSize());
@@ -474,7 +449,7 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 			IO.readFully(in, data2, 0, data.length);
 			assertTrue("same content", Arrays.equals(data2, data));
 			assertEquals("stream at EOF", -1, in.read());
-		in.close();
+		}
 	}
 
 	@Test
@@ -573,11 +548,8 @@ public class UnpackedObjectTest extends LocalDiskRepositoryTestCase {
 	private void write(ObjectId id, byte[] data) throws IOException {
 		File path = path(id);
 		FileUtils.mkdirs(path.getParentFile());
-		FileOutputStream out = new FileOutputStream(path);
-		try {
+		try (FileOutputStream out = new FileOutputStream(path)) {
 			out.write(data);
-		} finally {
-			out.close();
 		}
 	}
 

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/WindowCacheGetTest.java

@@ -74,11 +74,10 @@ public class WindowCacheGetTest extends SampleDataRepositoryTestCase {
 		super.setUp();
 
 		toLoad = new ArrayList<>();
-		final BufferedReader br = new BufferedReader(new InputStreamReader(
+		try (BufferedReader br = new BufferedReader(new InputStreamReader(
 				new FileInputStream(JGitTestUtil
 						.getTestResourceFile("all_packed_objects.txt")),
-				Constants.CHARSET));
-		try {
+				Constants.CHARSET))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final String[] parts = line.split(" {1,}");
@@ -90,8 +89,6 @@ public class WindowCacheGetTest extends SampleDataRepositoryTestCase {
 				// parts[4] is the offset in the pack
 				toLoad.add(o);
 			}
-		} finally {
-			br.close();
 		}
 		assertEquals(96, toLoad.size());
 	}

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java

@@ -176,12 +176,9 @@ public class RacyGitTests extends RepositoryTestCase {
 
 	private File addToWorkDir(String path, String content) throws IOException {
 		File f = new File(db.getWorkTree(), path);
-		FileOutputStream fos = new FileOutputStream(f);
-		try {
+		try (FileOutputStream fos = new FileOutputStream(f)) {
 			fos.write(content.getBytes(Constants.CHARACTER_ENCODING));
 			return f;
-		} finally {
-			fos.close();
 		}
 	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java

@@ -253,11 +253,11 @@ public class RefTest extends SampleDataRepositoryTestCase {
 			InterruptedException {
 		Ref ref = db.exactRef("refs/heads/master");
 		assertEquals(Storage.PACKED, ref.getStorage());
-		FileOutputStream os = new FileOutputStream(new File(db.getDirectory(),
-				"refs/heads/master"));
+		try (FileOutputStream os = new FileOutputStream(
+				new File(db.getDirectory(), "refs/heads/master"))) {
 			os.write(ref.getObjectId().name().getBytes());
 			os.write('\n');
-		os.close();
+		}
 
 		ref = db.exactRef("refs/heads/master");
 		assertEquals(Storage.LOOSE, ref.getStorage());

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RepositoryCacheTest.java

@@ -94,24 +94,25 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 
 	@Test
 	public void testFileKeyOpenExisting() throws IOException {
-		Repository r;
-
-		r = new FileKey(db.getDirectory(), db.getFS()).open(true);
+		try (Repository r = new FileKey(db.getDirectory(), db.getFS())
+				.open(true)) {
 			assertNotNull(r);
 			assertEqualsFile(db.getDirectory(), r.getDirectory());
-		r.close();
+		}
 
-		r = new FileKey(db.getDirectory(), db.getFS()).open(false);
+		try (Repository r = new FileKey(db.getDirectory(), db.getFS())
+				.open(false)) {
 			assertNotNull(r);
 			assertEqualsFile(db.getDirectory(), r.getDirectory());
-		r.close();
+		}
 	}
 
 	@Test
 	public void testFileKeyOpenNew() throws IOException {
-		final Repository n = createRepository(true, false);
-		final File gitdir = n.getDirectory();
-		n.close();
+		File gitdir;
+		try (Repository n = createRepository(true, false)) {
+			gitdir = n.getDirectory();
+		}
 		recursiveDelete(gitdir);
 		assertFalse(gitdir.exists());
 
@@ -143,6 +144,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 	@Test
 	public void testCacheOpen() throws Exception {
 		final FileKey loc = FileKey.exact(db.getDirectory(), db.getFS());
+		@SuppressWarnings("resource") // We are testing the close() method
 		final Repository d2 = RepositoryCache.open(loc);
 		assertNotSame(db, d2);
 		assertSame(d2, RepositoryCache.open(FileKey.exact(loc.getFile(), db.getFS())));
@@ -176,6 +178,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 	@Test
 	public void testRepositoryUsageCount() throws Exception {
 		FileKey loc = FileKey.exact(db.getDirectory(), db.getFS());
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository d2 = RepositoryCache.open(loc);
 		assertEquals(1, d2.useCnt.get());
 		RepositoryCache.open(FileKey.exact(loc.getFile(), db.getFS()));
@@ -189,6 +192,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 	@Test
 	public void testRepositoryUsageCountWithRegisteredRepository()
 			throws IOException {
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository repo = createRepository(false, false);
 		assertEquals(1, repo.useCnt.get());
 		RepositoryCache.register(repo);
@@ -200,6 +204,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 	@Test
 	public void testRepositoryNotUnregisteringWhenClosing() throws Exception {
 		FileKey loc = FileKey.exact(db.getDirectory(), db.getFS());
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository d2 = RepositoryCache.open(loc);
 		assertEquals(1, d2.useCnt.get());
 		assertThat(RepositoryCache.getRegisteredKeys(),
@@ -214,6 +219,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 	@Test
 	public void testRepositoryUnregisteringWhenExpiredAndUsageCountNegative()
 			throws Exception {
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository repoA = createBareRepository();
 		RepositoryCache.register(repoA);
 
@@ -234,7 +240,9 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 
 	@Test
 	public void testRepositoryUnregisteringWhenExpired() throws Exception {
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository repoA = createRepository(true, false);
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository repoB = createRepository(true, false);
 		Repository repoC = createBareRepository();
 		RepositoryCache.register(repoA);
@@ -268,6 +276,7 @@ public class RepositoryCacheTest extends RepositoryTestCase {
 
 	@Test
 	public void testReconfigure() throws InterruptedException, IOException {
+		@SuppressWarnings("resource") // We are testing the close() method
 		Repository repo = createRepository(false, false);
 		RepositoryCache.register(repo);
 		assertTrue(RepositoryCache.isCached(repo));

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/SquashCommitMsgTest.java

@@ -66,12 +66,9 @@ public class SquashCommitMsgTest extends RepositoryTestCase {
 		db.writeSquashCommitMsg(null);
 		assertEquals(db.readSquashCommitMsg(), null);
 		assertFalse(new File(db.getDirectory(), Constants.SQUASH_MSG).exists());
-		FileOutputStream fos = new FileOutputStream(new File(db.getDirectory(),
-				Constants.SQUASH_MSG));
-		try {
+		try (FileOutputStream fos = new FileOutputStream(
+				new File(db.getDirectory(), Constants.SQUASH_MSG))) {
 			fos.write(squashMsg.getBytes(Constants.CHARACTER_ENCODING));
-		} finally {
-			fos.close();
 		}
 		assertEquals(db.readSquashCommitMsg(), squashMsg);
 	}

org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/ResolveMergerTest.java

@@ -1033,19 +1033,21 @@ public class ResolveMergerTest extends RepositoryTestCase {
 		git.commit().setMessage("added c.txt").call();
 
 		// Get a handle to the the file so on windows it can't be deleted.
-		FileInputStream fis = new FileInputStream(new File(db.getWorkTree(),
-				"b.txt"));
+		try (FileInputStream fis = new FileInputStream(
+				new File(db.getWorkTree(), "b.txt"))) {
 			MergeResult mergeRes = git.merge().setStrategy(strategy)
 					.include(masterCommit).call();
 			if (mergeRes.getMergeStatus().equals(MergeStatus.FAILED)) {
 				// probably windows
 				assertEquals(1, mergeRes.getFailingPaths().size());
-			assertEquals(MergeFailureReason.COULD_NOT_DELETE, mergeRes
-					.getFailingPaths().get("b.txt"));
+				assertEquals(MergeFailureReason.COULD_NOT_DELETE,
+						mergeRes.getFailingPaths().get("b.txt"));
+			}
+			assertEquals(
+					"[a.txt, mode:100644, content:master]"
+							+ "[c.txt, mode:100644, content:side]",
+					indexState(CONTENT));
 		}
-		assertEquals("[a.txt, mode:100644, content:master]"
-				+ "[c.txt, mode:100644, content:side]", indexState(CONTENT));
-		fis.close();
 	}
 
 	@Theory

org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/PatchCcErrorTest.java

@@ -96,17 +96,14 @@ public class PatchCcErrorTest {
 
 	private Patch parseTestPatchFile() throws IOException {
 		final String patchFile = JGitTestUtil.getName() + ".patch";
-		final InputStream in = getClass().getResourceAsStream(patchFile);
+		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
-		try {
 			final Patch p = new Patch();
 			p.parse(in);
 			return p;
-		} finally {
-			in.close();
 		}
 	}
 

org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/PatchCcTest.java

@@ -199,17 +199,14 @@ public class PatchCcTest {
 
 	private Patch parseTestPatchFile() throws IOException {
 		final String patchFile = JGitTestUtil.getName() + ".patch";
-		final InputStream in = getClass().getResourceAsStream(patchFile);
+		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
-		try {
 			final Patch p = new Patch();
 			p.parse(in);
 			return p;
-		} finally {
-			in.close();
 		}
 	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/PatchErrorTest.java

@@ -177,17 +177,14 @@ public class PatchErrorTest {
 
 	private Patch parseTestPatchFile() throws IOException {
 		final String patchFile = JGitTestUtil.getName() + ".patch";
-		final InputStream in = getClass().getResourceAsStream(patchFile);
+		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
-		try {
 			final Patch p = new Patch();
 			p.parse(in);
 			return p;
-		} finally {
-			in.close();
 		}
 	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/PatchTest.java

@@ -357,17 +357,14 @@ public class PatchTest {
 
 	private Patch parseTestPatchFile() throws IOException {
 		final String patchFile = JGitTestUtil.getName() + ".patch";
-		final InputStream in = getClass().getResourceAsStream(patchFile);
+		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
-		try {
 			final Patch p = new Patch();
 			p.parse(in);
 			return p;
-		} finally {
-			in.close();
 		}
 	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleAddTest.java

@@ -129,10 +129,11 @@ public class SubmoduleAddTest extends RepositoryTestCase {
 			command.setPath(path);
 			String uri = db.getDirectory().toURI().toString();
 			command.setURI(uri);
-			Repository repo = command.call();
+			ObjectId subCommit;
+			try (Repository repo = command.call()) {
 				assertNotNull(repo);
-			ObjectId subCommit = repo.resolve(Constants.HEAD);
-			repo.close();
+				subCommit = repo.resolve(Constants.HEAD);
+			}
 
 			SubmoduleWalk generator = SubmoduleWalk.forIndex(db);
 			assertTrue(generator.next());
@@ -141,10 +142,10 @@ public class SubmoduleAddTest extends RepositoryTestCase {
 			assertEquals(uri, generator.getModulesUrl());
 			assertEquals(path, generator.getModulesPath());
 			assertEquals(uri, generator.getConfigUrl());
-			Repository subModRepo = generator.getRepository();
+			try (Repository subModRepo = generator.getRepository()) {
 				assertNotNull(subModRepo);
 				assertEquals(subCommit, commit);
-			subModRepo.close();
+			}
 
 			Status status = Git.wrap(db).status().call();
 			assertTrue(status.getAdded().contains(Constants.DOT_GIT_MODULES));
@@ -209,16 +210,14 @@ public class SubmoduleAddTest extends RepositoryTestCase {
 				fullUri = fullUri.replace('\\', '/');
 			}
 			assertEquals(fullUri, generator.getConfigUrl());
-			Repository subModRepo = generator.getRepository();
+			try (Repository subModRepo = generator.getRepository()) {
 				assertNotNull(subModRepo);
-			assertEquals(
-					fullUri,
-					subModRepo
-							.getConfig()
-							.getString(ConfigConstants.CONFIG_REMOTE_SECTION,
+				assertEquals(fullUri,
+						subModRepo.getConfig().getString(
+								ConfigConstants.CONFIG_REMOTE_SECTION,
 								Constants.DEFAULT_REMOTE_NAME,
 								ConfigConstants.CONFIG_KEY_URL));
-			subModRepo.close();
+			}
 			assertEquals(commit, repo.resolve(Constants.HEAD));
 
 			Status status = Git.wrap(db).status().call();

org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleSyncTest.java

@@ -135,12 +135,14 @@ public class SubmoduleSyncTest extends RepositoryTestCase {
 		generator = SubmoduleWalk.forIndex(db);
 		assertTrue(generator.next());
 		assertEquals(url, generator.getConfigUrl());
-		Repository subModRepository = generator.getRepository();
+		try (Repository subModRepository = generator.getRepository()) {
 			StoredConfig submoduleConfig = subModRepository.getConfig();
-		subModRepository.close();
-		assertEquals(url, submoduleConfig.getString(
+			assertEquals(url,
+					submoduleConfig.getString(
 							ConfigConstants.CONFIG_REMOTE_SECTION,
-				Constants.DEFAULT_REMOTE_NAME, ConfigConstants.CONFIG_KEY_URL));
+							Constants.DEFAULT_REMOTE_NAME,
+							ConfigConstants.CONFIG_KEY_URL));
+		}
 	}
 
 	@Test
@@ -208,11 +210,13 @@ public class SubmoduleSyncTest extends RepositoryTestCase {
 		generator = SubmoduleWalk.forIndex(db);
 		assertTrue(generator.next());
 		assertEquals("git://server/sub.git", generator.getConfigUrl());
-		Repository subModRepository1 = generator.getRepository();
+		try (Repository subModRepository1 = generator.getRepository()) {
 			StoredConfig submoduleConfig = subModRepository1.getConfig();
-		subModRepository1.close();
-		assertEquals("git://server/sub.git", submoduleConfig.getString(
+			assertEquals("git://server/sub.git",
+					submoduleConfig.getString(
 							ConfigConstants.CONFIG_REMOTE_SECTION,
-				Constants.DEFAULT_REMOTE_NAME, ConfigConstants.CONFIG_KEY_URL));
+							Constants.DEFAULT_REMOTE_NAME,
+							ConfigConstants.CONFIG_KEY_URL));
+		}
 	}
 }

org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleUpdateTest.java

@@ -121,10 +121,10 @@ public class SubmoduleUpdateTest extends RepositoryTestCase {
 
 		SubmoduleWalk generator = SubmoduleWalk.forIndex(db);
 		assertTrue(generator.next());
-		Repository subRepo = generator.getRepository();
+		try (Repository subRepo = generator.getRepository()) {
 			assertNotNull(subRepo);
 			assertEquals(commit, subRepo.resolve(Constants.HEAD));
-		subRepo.close();
+		}
 	}
 
 	@Test

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/NetRCTest.java

@@ -74,10 +74,10 @@ public class NetRCTest extends RepositoryTestCase {
 	}
 
 	private void config(final String data) throws IOException {
-		final OutputStreamWriter fw = new OutputStreamWriter(
-				new FileOutputStream(configFile), "UTF-8");
+		try (OutputStreamWriter fw = new OutputStreamWriter(
+				new FileOutputStream(configFile), "UTF-8")) {
 			fw.write(data);
-		fw.close();
+		}
 	}
 
 	@Test

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/PackParserTest.java

@@ -93,8 +93,7 @@ public class PackParserTest extends RepositoryTestCase {
 	@Test
 	public void test1() throws  IOException {
 		File packFile = JGitTestUtil.getTestResourceFile("pack-34be9032ac282b11fa9babdc2b2a93ca996c9c2f.pack");
-		final InputStream is = new FileInputStream(packFile);
-		try {
+		try (InputStream is = new FileInputStream(packFile)) {
 			ObjectDirectoryPackParser p = (ObjectDirectoryPackParser) index(is);
 			p.parse(NullProgressMonitor.INSTANCE);
 			PackFile file = p.getPackFile();
@@ -107,8 +106,6 @@ public class PackParserTest extends RepositoryTestCase {
 			assertTrue(file.hasObject(ObjectId.fromString("902d5476fa249b7abc9d84c611577a81381f0327")));
 			assertTrue(file.hasObject(ObjectId.fromString("aabf2ffaec9b497f0950352b3e582d73035c2035")));
 			assertTrue(file.hasObject(ObjectId.fromString("c59759f143fb1fe21c197981df75a7ee00290799")));
-		} finally {
-			is.close();
 		}
 	}
 
@@ -121,8 +118,7 @@ public class PackParserTest extends RepositoryTestCase {
 	@Test
 	public void test2() throws  IOException {
 		File packFile = JGitTestUtil.getTestResourceFile("pack-df2982f284bbabb6bdb59ee3fcc6eb0983e20371.pack");
-		final InputStream is = new FileInputStream(packFile);
-		try {
+		try (InputStream is = new FileInputStream(packFile)) {
 			ObjectDirectoryPackParser p = (ObjectDirectoryPackParser) index(is);
 			p.parse(NullProgressMonitor.INSTANCE);
 			PackFile file = p.getPackFile();
@@ -140,8 +136,6 @@ public class PackParserTest extends RepositoryTestCase {
 			assertTrue(file.hasObject(ObjectId.fromString("20a8ade77639491ea0bd667bf95de8abf3a434c8")));
 			assertTrue(file.hasObject(ObjectId.fromString("2675188fd86978d5bc4d7211698b2118ae3bf658")));
 			// and lots more...
-		} finally {
-			is.close();
 		}
 	}
 

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java

@@ -419,12 +419,9 @@ public class WalkEncryptionTest {
 				URLConnection c = url.openConnection();
 				c.setConnectTimeout(500);
 				c.setReadTimeout(500);
-				BufferedReader reader = new BufferedReader(
-						new InputStreamReader(c.getInputStream()));
-				try {
+				try (BufferedReader reader = new BufferedReader(
+						new InputStreamReader(c.getInputStream()))) {
 					return reader.readLine();
-				} finally {
-					reader.close();
 				}
 			} catch (UnknownHostException | SocketTimeoutException e) {
 				return "Can't reach http://checkip.amazonaws.com to"
@@ -654,9 +651,9 @@ public class WalkEncryptionTest {
 			Properties props = Props.discover();
 			props.put(AmazonS3.Keys.PASSWORD, JGIT_PASS);
 			props.put(AmazonS3.Keys.CRYPTO_ALG, algorithm);
-			PrintWriter writer = new PrintWriter(JGIT_CONF_FILE);
+			try (PrintWriter writer = new PrintWriter(JGIT_CONF_FILE)) {
 				props.store(writer, "JGIT S3 connection configuration file.");
-			writer.close();
+			}
 		}
 
 		/**
@@ -668,9 +665,9 @@ public class WalkEncryptionTest {
 		static void configCreate(Properties source) throws Exception {
 			Properties target = Props.discover();
 			target.putAll(source);
-			PrintWriter writer = new PrintWriter(JGIT_CONF_FILE);
+			try (PrintWriter writer = new PrintWriter(JGIT_CONF_FILE)) {
 				target.store(writer, "JGIT S3 connection configuration file.");
-			writer.close();
+			}
 		}
 
 		/**
@@ -836,10 +833,10 @@ public class WalkEncryptionTest {
 			{
 				byte[] origin = sourceText.getBytes(charset);
 				ByteArrayOutputStream target = new ByteArrayOutputStream();
-				OutputStream source = crypto.encrypt(target);
+				try (OutputStream source = crypto.encrypt(target)) {
 					source.write(origin);
 					source.flush();
-				source.close();
+				}
 				cipherText = target.toByteArray();
 			}
 			{
@@ -1074,10 +1071,10 @@ public class WalkEncryptionTest {
 				remoteConfig.update(config);
 				config.save();
 
-				Git git = Git.open(dirOne);
+				try (Git git = Git.open(dirOne)) {
 					git.checkout().setName("master").call();
 					git.push().setRemote(remote).setRefSpecs(specs).call();
-				git.close();
+				}
 
 				File fileStatic = new File(dirOne, nameStatic);
 				assertTrue("Provided by setup", fileStatic.exists());
@@ -1089,13 +1086,13 @@ public class WalkEncryptionTest {
 				File fileStatic = new File(dirTwo, nameStatic);
 				assertFalse("Not Provided by setup", fileStatic.exists());
 
-				Git git = Git.cloneRepository().setURI(uri).setDirectory(dirTwo)
-						.call();
-				git.close();
-
+				try (Git git = Git.cloneRepository().setURI(uri)
+						.setDirectory(dirTwo).call()) {
 					assertTrue("Provided by clone", fileStatic.exists());
 				}
 
+			}
+
 			{ // Verify static file content.
 				File fileOne = new File(dirOne, nameStatic);
 				File fileTwo = new File(dirTwo, nameStatic);
@@ -1111,11 +1108,11 @@ public class WalkEncryptionTest {
 				assertTrue("Provided by create", fileDynamic.exists());
 				assertTrue("Need content to encrypt", fileDynamic.length() > 0);
 
-				Git git = Git.open(dirOne);
+				try (Git git = Git.open(dirOne)) {
 					git.add().addFilepattern(nameDynamic).call();
 					git.commit().setMessage(nameDynamic).call();
 					git.push().setRemote(remote).setRefSpecs(specs).call();
-				git.close();
+				}
 
 			}
 
@@ -1124,9 +1121,9 @@ public class WalkEncryptionTest {
 				File fileDynamic = new File(dirTwo, nameDynamic);
 				assertFalse("Not Provided by setup", fileDynamic.exists());
 
-				Git git = Git.open(dirTwo);
+				try (Git git = Git.open(dirTwo)) {
 					git.pull().call();
-				git.close();
+				}
 
 				assertTrue("Provided by pull", fileDynamic.exists());
 			}

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/NotTreeFilterTest.java

@@ -57,13 +57,14 @@ import org.junit.Test;
 public class NotTreeFilterTest extends RepositoryTestCase {
 	@Test
 	public void testWrap() throws Exception {
-		final TreeWalk tw = new TreeWalk(db);
+		try (TreeWalk tw = new TreeWalk(db)) {
 			final TreeFilter a = TreeFilter.ALL;
 			final TreeFilter n = NotTreeFilter.create(a);
 			assertNotNull(n);
 			assertTrue(a.include(tw));
 			assertFalse(n.include(tw));
 		}
+	}
 
 	@Test
 	public void testNegateIsUnwrap() throws Exception {

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/TemporaryBufferTest.java

@@ -87,10 +87,8 @@ public class TemporaryBufferTest {
 				assertEquals(1, r.length);
 				assertEquals(test, r[0]);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(1, r.length);
 				assertEquals(test, r[0]);
@@ -118,10 +116,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -149,10 +145,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -178,10 +172,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -208,10 +200,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -236,10 +226,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -253,15 +241,14 @@ public class TemporaryBufferTest {
 	public void testInCoreInputStream() throws IOException {
 		final int cnt = 256;
 		final byte[] test = new TestRng(getName()).nextBytes(cnt);
-		final TemporaryBuffer.Heap b = new TemporaryBuffer.Heap(cnt + 4);
+		try (final TemporaryBuffer.Heap b = new TemporaryBuffer.Heap(cnt + 4)) {
 			b.write(test);
-		b.close();
-
 			InputStream in = b.openInputStream();
 			byte[] act = new byte[cnt];
 			IO.readFully(in, act, 0, cnt);
 			assertArrayEquals(test, act);
 		}
+	}
 
 	@Test
 	public void testInCoreLimit_SwitchOnAppendByte() throws IOException {
@@ -279,10 +266,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -308,10 +293,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -340,10 +323,8 @@ public class TemporaryBufferTest {
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(test.length, r.length);
 				assertArrayEquals(test, r);
@@ -399,10 +380,8 @@ public class TemporaryBufferTest {
 				assertEquals(expect.length, r.length);
 				assertArrayEquals(expect, r);
 			}
-			{
-				final ByteArrayOutputStream o = new ByteArrayOutputStream();
+			try (ByteArrayOutputStream o = new ByteArrayOutputStream()) {
 				b.writeTo(o, null);
-				o.close();
 				final byte[] r = o.toByteArray();
 				assertEquals(expect.length, r.length);
 				assertArrayEquals(expect, r);

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFOutputStreamTest.java

@@ -96,9 +96,9 @@ public class AutoCRLFOutputStreamTest {
 		for (int i = -4; i < 5; ++i) {
 			int size = Math.abs(i);
 			byte[] buf = new byte[size];
-			InputStream in = new ByteArrayInputStream(inbytes);
+			try (InputStream in = new ByteArrayInputStream(inbytes);
 					ByteArrayOutputStream bos = new ByteArrayOutputStream();
-			OutputStream out = new AutoCRLFOutputStream(bos);
+					OutputStream out = new AutoCRLFOutputStream(bos)) {
 				if (i > 0) {
 					int n;
 					while ((n = in.read(buf)) >= 0) {
@@ -117,13 +117,12 @@ public class AutoCRLFOutputStreamTest {
 						out.write(c);
 				}
 				out.flush();
-			in.close();
-			out.close();
 				byte[] actualBytes = bos.toByteArray();
 				Assert.assertEquals("bufsize=" + size, encode(expectBytes),
 						encode(actualBytes));
 			}
 		}
+	}
 
 	String encode(byte[] in) {
 		StringBuilder str = new StringBuilder();

org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/UnionInputStreamTest.java

@@ -58,13 +58,13 @@ import org.junit.Test;
 public class UnionInputStreamTest {
 	@Test
 	public void testEmptyStream() throws IOException {
-		final UnionInputStream u = new UnionInputStream();
+		try (UnionInputStream u = new UnionInputStream()) {
 			assertTrue(u.isEmpty());
 			assertEquals(-1, u.read());
 			assertEquals(-1, u.read(new byte[1], 0, 1));
 			assertEquals(0, u.available());
 			assertEquals(0, u.skip(1));
-		u.close();
+		}
 	}
 
 	@Test
@@ -211,8 +211,8 @@ public class UnionInputStreamTest {
 
 	@Test
 	public void testCloseDuringClose() throws IOException {
-		final UnionInputStream u = new UnionInputStream();
 		final boolean closed[] = new boolean[2];
+		try (UnionInputStream u = new UnionInputStream()) {
 			u.add(new ByteArrayInputStream(new byte[] { 1 }) {
 				@Override
 				public void close() {
@@ -228,8 +228,7 @@ public class UnionInputStreamTest {
 
 			assertFalse(closed[0]);
 			assertFalse(closed[1]);
-
-		u.close();
+		}
 
 		assertTrue(closed[0]);
 		assertTrue(closed[1]);
@@ -237,6 +236,7 @@ public class UnionInputStreamTest {
 
 	@Test
 	public void testExceptionDuringClose() {
+		@SuppressWarnings("resource") // We are testing the close() method
 		final UnionInputStream u = new UnionInputStream();
 		u.add(new ByteArrayInputStream(new byte[] { 1 }) {
 			@Override

org.eclipse.jgit/src/org/eclipse/jgit/api/CloneCommand.java

@@ -386,12 +386,9 @@ public class CloneCommand extends TransportCommand<CloneCommand, Git> {
 		if (!update.call().isEmpty()) {
 			SubmoduleWalk walk = SubmoduleWalk.forIndex(clonedRepo);
 			while (walk.next()) {
-				Repository subRepo = walk.getRepository();
+				try (Repository subRepo = walk.getRepository()) {
 					if (subRepo != null) {
-					try {
 						cloneSubmodules(subRepo);
-					} finally {
-						subRepo.close();
 					}
 				}
 			}

org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java

@@ -1734,23 +1734,17 @@ public class RebaseCommand extends GitCommand<RebaseResult> {
 				String content)
 				throws IOException {
 			File file = new File(parentDir, name);
-			FileOutputStream fos = new FileOutputStream(file);
-			try {
+			try (FileOutputStream fos = new FileOutputStream(file)) {
 				fos.write(content.getBytes(Constants.CHARACTER_ENCODING));
 				fos.write('\n');
-			} finally {
-				fos.close();
 			}
 		}
 
 		private static void appendToFile(File file, String content)
 				throws IOException {
-			FileOutputStream fos = new FileOutputStream(file, true);
-			try {
+			try (FileOutputStream fos = new FileOutputStream(file, true)) {
 				fos.write(content.getBytes(Constants.CHARACTER_ENCODING));
 				fos.write('\n');
-			} finally {
-				fos.close();
 			}
 		}
 	}

org.eclipse.jgit/src/org/eclipse/jgit/api/StashCreateCommand.java

@@ -303,12 +303,9 @@ public class StashCreateCommand extends GitCommand<RevCommit> {
 						entry.setLastModified(wtIter.getEntryLastModified());
 						entry.setFileMode(wtIter.getEntryFileMode());
 						long contentLength = wtIter.getEntryContentLength();
-						InputStream in = wtIter.openEntryStream();
-						try {
+						try (InputStream in = wtIter.openEntryStream()) {
 							entry.setObjectId(inserter.insert(
 									Constants.OBJ_BLOB, contentLength, in));
-						} finally {
-							in.close();
 						}
 
 						if (indexIter == null && headIter == null)

org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityIndex.java

@@ -147,19 +147,13 @@ public class SimilarityIndex {
 
 	private void hashLargeObject(ObjectLoader obj) throws IOException,
 			TableFullException {
-		ObjectStream in1 = obj.openStream();
 		boolean text;
-		try {
+		try (ObjectStream in1 = obj.openStream()) {
 			text = !RawText.isBinary(in1);
-		} finally {
-			in1.close();
 		}
 
-		ObjectStream in2 = obj.openStream();
-		try {
+		try (ObjectStream in2 = obj.openStream()) {
 			hash(in2, in2.getSize(), text);
-		} finally {
-			in2.close();
 		}
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java

@@ -131,18 +131,10 @@ public class RepoProject implements Comparable<RepoProject> {
 			File srcFile = new File(repo.getWorkTree(),
 					path + "/" + src); //$NON-NLS-1$
 			File destFile = new File(repo.getWorkTree(), dest);
-			FileInputStream input = new FileInputStream(srcFile);
-			try {
-				FileOutputStream output = new FileOutputStream(destFile);
-				try {
+			try (FileInputStream input = new FileInputStream(srcFile);
+					FileOutputStream output = new FileOutputStream(destFile)) {
 				FileChannel channel = input.getChannel();
-					output.getChannel().transferFrom(
-							channel, 0, channel.size());
-				} finally {
-					output.close();
-				}
-			} finally {
-				input.close();
+				output.getChannel().transferFrom(channel, 0, channel.size());
 			}
 		}
 	}

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

@@ -209,8 +209,7 @@ public final class DfsPackFile extends BlockBasedFile {
 			try {
 				ctx.stats.readIdx++;
 				long start = System.nanoTime();
-				ReadableChannel rc = ctx.db.openFile(desc, INDEX);
-				try {
+				try (ReadableChannel rc = ctx.db.openFile(desc, INDEX)) {
 					InputStream in = Channels.newInputStream(rc);
 					int wantSize = 8192;
 					int bs = rc.blockSize();
@@ -221,7 +220,6 @@ public final class DfsPackFile extends BlockBasedFile {
 					idx = PackIndex.read(new BufferedInputStream(in, bs));
 					ctx.stats.readIdxBytes += rc.position();
 				} finally {
-					rc.close();
 					ctx.stats.readIdxMicros += elapsedMicros(start);
 				}
 			} catch (EOFException e) {

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectoryPackParser.java

@@ -429,8 +429,7 @@ public class ObjectDirectoryPackParser extends PackParser {
 
 	private void writeIdx() throws IOException {
 		List<PackedObjectInfo> list = getSortedObjectList(null /* by ObjectId */);
-		final FileOutputStream os = new FileOutputStream(tmpIdx);
-		try {
+		try (FileOutputStream os = new FileOutputStream(tmpIdx)) {
 			final PackIndexWriter iw;
 			if (indexVersion <= 0)
 				iw = PackIndexWriter.createOldestPossible(os, list);
@@ -438,8 +437,6 @@ public class ObjectDirectoryPackParser extends PackParser {
 				iw = PackIndexWriter.createVersion(os, indexVersion);
 			iw.write(list, packHash);
 			os.getChannel().force(true);
-		} finally {
-			os.close();
 		}
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectLoader.java

@@ -194,8 +194,7 @@ public abstract class ObjectLoader {
 		if (!isLarge())
 			return getCachedBytes();
 
-		ObjectStream in = openStream();
-		try {
+		try (ObjectStream in = openStream()) {
 			long sz = in.getSize();
 			if (sizeLimit < sz)
 				throw new LargeObjectException.ExceedsLimit(sizeLimit, sz);
@@ -212,8 +211,6 @@ public abstract class ObjectLoader {
 
 			IO.readFully(in, buf, 0, buf.length);
 			return buf;
-		} finally {
-			in.close();
 		}
 	}
 
@@ -255,8 +252,7 @@ public abstract class ObjectLoader {
 	public void copyTo(OutputStream out) throws MissingObjectException,
 			IOException {
 		if (isLarge()) {
-			ObjectStream in = openStream();
-			try {
+			try (ObjectStream in = openStream()) {
 				final long sz = in.getSize();
 				byte[] tmp = new byte[8192];
 				long copied = 0;
@@ -269,8 +265,6 @@ public abstract class ObjectLoader {
 				}
 				if (0 <= in.read())
 					throw new EOFException();
-			} finally {
-				in.close();
 			}
 		} else {
 			out.write(getCachedBytes());

org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java

@@ -1946,11 +1946,8 @@ public abstract class Repository implements AutoCloseable {
 
 	private void writeCommitMsg(File msgFile, String msg) throws IOException {
 		if (msg != null) {
-			FileOutputStream fos = new FileOutputStream(msgFile);
-			try {
+			try (FileOutputStream fos = new FileOutputStream(msgFile)) {
 				fos.write(msg.getBytes(Constants.CHARACTER_ENCODING));
-			} finally {
-				fos.close();
 			}
 		} else {
 			FileUtils.delete(msgFile, FileUtils.SKIP_MISSING);

org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java

@@ -1642,17 +1642,17 @@ public abstract class PackParser {
 
 	private void inflateAndSkip(final Source src, final long inflatedSize)
 			throws IOException {
-		final InputStream inf = inflate(src, inflatedSize);
+		try (InputStream inf = inflate(src, inflatedSize)) {
 			IO.skipFully(inf, inflatedSize);
-		inf.close();
+		}
 	}
 
 	private byte[] inflateAndReturn(final Source src, final long inflatedSize)
 			throws IOException {
 		final byte[] dst = new byte[(int) inflatedSize];
-		final InputStream inf = inflate(src, inflatedSize);
+		try (InputStream inf = inflate(src, inflatedSize)) {
 			IO.readFully(inf, dst, 0, dst.length);
-		inf.close();
+		}
 		return dst;
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportAmazonS3.java

@@ -339,11 +339,8 @@ public class TransportAmazonS3 extends HttpTransport implements WalkTransport {
 			final String s;
 			String ref = ROOT_DIR + rn;
 			try {
-				final BufferedReader br = openReader(ref);
-				try {
+				try (BufferedReader br = openReader(ref)) {
 					s = br.readLine();
-				} finally {
-					br.close();
 				}
 			} catch (FileNotFoundException noRef) {
 				return null;

org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkFetchConnection.java

@@ -853,18 +853,13 @@ class WalkFetchConnection extends BaseFetchConnection {
 			pm.beginTask("Get " + idxName.substring(0, 12) + "..idx", //$NON-NLS-1$ //$NON-NLS-2$
 					s.length < 0 ? ProgressMonitor.UNKNOWN
 							: (int) (s.length / 1024));
-			try {
-				final FileOutputStream fos = new FileOutputStream(tmpIdx);
-				try {
+			try (final FileOutputStream fos = new FileOutputStream(tmpIdx)) {
 				final byte[] buf = new byte[2048];
 				int cnt;
 				while (!pm.isCancelled() && (cnt = s.in.read(buf)) >= 0) {
 					fos.write(buf, 0, cnt);
 					pm.update(cnt / 1024);
 				}
-				} finally {
-					fos.close();
-				}
 			} catch (IOException err) {
 				FileUtils.delete(tmpIdx);
 				throw err;

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

@@ -1280,11 +1280,8 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 
 		IgnoreNode load() throws IOException {
 			IgnoreNode r = new IgnoreNode();
-			InputStream in = entry.openInputStream();
-			try {
+			try (InputStream in = entry.openInputStream()) {
 				r.parse(in);
-			} finally {
-				in.close();
 			}
 			return r.getRules().isEmpty() ? null : r;
 		}
@@ -1332,11 +1329,8 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		private static void loadRulesFromFile(IgnoreNode r, File exclude)
 				throws FileNotFoundException, IOException {
 			if (FS.DETECTED.exists(exclude)) {
-				FileInputStream in = new FileInputStream(exclude);
-				try {
+				try (FileInputStream in = new FileInputStream(exclude)) {
 					r.parse(in);
-				} finally {
-					in.close();
 				}
 			}
 		}
@@ -1353,11 +1347,8 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 
 		AttributesNode load() throws IOException {
 			AttributesNode r = new AttributesNode();
-			InputStream in = entry.openInputStream();
-			try {
+			try (InputStream in = entry.openInputStream()) {
 				r.parse(in);
-			} finally {
-				in.close();
 			}
 			return r.getRules().isEmpty() ? null : r;
 		}

org.eclipse.jgit/src/org/eclipse/jgit/util/TemporaryBuffer.java

@@ -487,11 +487,8 @@ public abstract class TemporaryBuffer extends OutputStream {
 			if (Integer.MAX_VALUE < len)
 				throw new OutOfMemoryError(JGitText.get().lengthExceedsMaximumArraySize);
 			final byte[] out = new byte[(int) len];
-			final FileInputStream in = new FileInputStream(onDiskFile);
-			try {
+			try (FileInputStream in = new FileInputStream(onDiskFile)) {
 				IO.readFully(in, out, 0, (int) len);
-			} finally {
-				in.close();
 			}
 			return out;
 		}
@@ -505,16 +502,13 @@ public abstract class TemporaryBuffer extends OutputStream {
 			}
 			if (pm == null)
 				pm = NullProgressMonitor.INSTANCE;
-			final FileInputStream in = new FileInputStream(onDiskFile);
-			try {
+			try (FileInputStream in = new FileInputStream(onDiskFile)) {
 				int cnt;
 				final byte[] buf = new byte[Block.SZ];
 				while ((cnt = in.read(buf)) >= 0) {
 					os.write(buf, 0, cnt);
 					pm.update(cnt / 1024);
 				}
-			} finally {
-				in.close();
 			}
 		}