BundleWriterTest: Open RevWalk in try-with-resource

Change-Id: Ie25770a73b19d6522bad9fdc0966f48370f96265
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

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

@@ -126,24 +126,26 @@ public class BundleWriterTest extends SampleDataRepositoryTestCase {
 		assertNull(newRepo.resolve("refs/heads/a"));
 
 		// Next an incremental bundle
-		bundle = makeBundle("refs/heads/cc", db.resolve("c").name(),
-				new RevWalk(db).parseCommit(db.resolve("a").toObjectId()));
-		fetchResult = fetchFromBundle(newRepo, bundle);
-		advertisedRef = fetchResult.getAdvertisedRef("refs/heads/cc");
-		assertEquals(db.resolve("c").name(), advertisedRef.getObjectId().name());
-		assertEquals(db.resolve("c").name(), newRepo.resolve("refs/heads/cc")
-				.name());
-		assertNull(newRepo.resolve("refs/heads/c"));
-		assertNull(newRepo.resolve("refs/heads/a")); // still unknown
-
-		try {
-			// Check that we actually needed the first bundle
-			Repository newRepo2 = createBareRepository();
-			fetchResult = fetchFromBundle(newRepo2, bundle);
-			fail("We should not be able to fetch from bundle with prerequisites that are not fulfilled");
-		} catch (MissingBundlePrerequisiteException e) {
-			assertTrue(e.getMessage()
-					.indexOf(db.resolve("refs/heads/a").name()) >= 0);
+		try (RevWalk rw = new RevWalk(db)) {
+			bundle = makeBundle("refs/heads/cc", db.resolve("c").name(),
+					rw.parseCommit(db.resolve("a").toObjectId()));
+			fetchResult = fetchFromBundle(newRepo, bundle);
+			advertisedRef = fetchResult.getAdvertisedRef("refs/heads/cc");
+			assertEquals(db.resolve("c").name(), advertisedRef.getObjectId().name());
+			assertEquals(db.resolve("c").name(), newRepo.resolve("refs/heads/cc")
+					.name());
+			assertNull(newRepo.resolve("refs/heads/c"));
+			assertNull(newRepo.resolve("refs/heads/a")); // still unknown
+
+			try {
+				// Check that we actually needed the first bundle
+				Repository newRepo2 = createBareRepository();
+				fetchResult = fetchFromBundle(newRepo2, bundle);
+				fail("We should not be able to fetch from bundle with prerequisites that are not fulfilled");
+			} catch (MissingBundlePrerequisiteException e) {
+				assertTrue(e.getMessage()
+						.indexOf(db.resolve("refs/heads/a").name()) >= 0);
+			}
 		}
 	}