diff --git a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
index b21c94e4e..7b76cecf0 100644
--- a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
+++ b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
@@ -411,7 +411,8 @@ class SignerV4 {
 		String stringToSign = stringToSign(SCHEME, ALGORITHM, dateTimeStamp,
 				scope, canonicalRequest);
 
-		byte[] signature = (SCHEME + bucketConfig.getSecretKey()).getBytes();
+		byte[] signature = (SCHEME + bucketConfig.getSecretKey())
+				.getBytes(UTF_8);
 		signature = sign(dateStamp, signature);
 		signature = sign(bucketConfig.getRegion(), signature);
 		signature = sign(S3, signature);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTest.java
index ca0630ea3..6f1e0cf22 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CommitAndLogCommandTest.java
@@ -42,6 +42,7 @@
  */
 package org.eclipse.jgit.api;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -358,7 +359,7 @@ public class CommitAndLogCommandTest extends RepositoryTestCase {
 					messageHeader + messageFooter)
 					.setInsertChangeId(true).call();
 			// we should find a real change id (at the end of the file)
-			byte[] chars = commit.getFullMessage().getBytes();
+			byte[] chars = commit.getFullMessage().getBytes(UTF_8);
 			int lastLineBegin = RawParseUtils.prevLF(chars, chars.length - 2);
 			String lastLine = RawParseUtils.decode(chars, lastLineBegin + 1,
 					chars.length);
@@ -371,7 +372,7 @@ public class CommitAndLogCommandTest extends RepositoryTestCase {
 					.setInsertChangeId(true).call();
 			// we should find a real change id (in the line as dictated by the
 			// template)
-			chars = commit.getFullMessage().getBytes();
+			chars = commit.getFullMessage().getBytes(UTF_8);
 			int lineStart = 0;
 			int lineEnd = 0;
 			for (int i = 0; i < 4; i++) {
@@ -389,7 +390,7 @@ public class CommitAndLogCommandTest extends RepositoryTestCase {
 					messageHeader + changeIdTemplate + messageFooter)
 					.setInsertChangeId(false).call();
 			// we should find the untouched template
-			chars = commit.getFullMessage().getBytes();
+			chars = commit.getFullMessage().getBytes(UTF_8);
 			lineStart = 0;
 			lineEnd = 0;
 			for (int i = 0; i < 4; i++) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/AttributesNodeTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/AttributesNodeTest.java
index f0d3c3690..f4ccf0506 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/AttributesNodeTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/AttributesNodeTest.java
@@ -42,6 +42,7 @@
  */
 package org.eclipse.jgit.attributes;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.attributes.Attribute.State.SET;
 import static org.eclipse.jgit.attributes.Attribute.State.UNSET;
 import static org.junit.Assert.assertEquals;
@@ -88,7 +89,7 @@ public class AttributesNodeTest {
 		String attributeFileContent = "*.type1 A -B C=value\n"
 				+ "*.type2 -A B C=value2";
 
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node,
@@ -102,7 +103,7 @@ public class AttributesNodeTest {
 		String attributeFileContent = "!*.type1 A -B C=value\n"
 				+ "!*.type2 -A B C=value2";
 
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node, new Attributes());
@@ -113,7 +114,7 @@ public class AttributesNodeTest {
 	public void testEmptyNegativeAttributeKey() throws IOException {
 		String attributeFileContent = "*.type1 - \n" //
 				+ "*.type2 -   -A";
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node, new Attributes());
@@ -125,7 +126,7 @@ public class AttributesNodeTest {
 		String attributeFileContent = "*.type1 = \n" //
 				+ "*.type2 =value\n"//
 				+ "*.type3 attr=\n";
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node, new Attributes());
@@ -140,7 +141,7 @@ public class AttributesNodeTest {
 				+ "    \n" //
 				+ "*.type2 -A B C=value2";
 
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node,
@@ -156,7 +157,7 @@ public class AttributesNodeTest {
 				+ "*.type3  \t\t   B\n" //
 				+ "*.type3\t-A";//
 
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("file.type1", node,
@@ -170,7 +171,7 @@ public class AttributesNodeTest {
 	public void testDoubleAsteriskAtEnd() throws IOException {
 		String attributeFileContent = "dir/** \tA -B\tC=value";
 
-		is = new ByteArrayInputStream(attributeFileContent.getBytes());
+		is = new ByteArrayInputStream(attributeFileContent.getBytes(UTF_8));
 		AttributesNode node = new AttributesNode();
 		node.parse(is);
 		assertAttribute("dir", node,
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java
index dc05eeabe..acdaf3aa3 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java
@@ -44,6 +44,7 @@
 
 package org.eclipse.jgit.internal.storage.file;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
@@ -67,31 +68,31 @@ import org.junit.Test;
 public class ReflogReaderTest extends SampleDataRepositoryTestCase {
 
 	static byte[] oneLine = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\tcommit: Add a toString for debugging to RemoteRefUpdate\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	static byte[] twoLine = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
 			+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n")
-			.getBytes();
+					.getBytes(UTF_8);
 
 	static byte[] twoLineWithAppendInProgress = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
 			+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n"
 			+ "54794942a18a237c57a80719afed44bb78172b10 ")
-			.getBytes();
+					.getBytes(UTF_8);
 
 	static byte[] aLine = "1111111111111111111111111111111111111111 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to a\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	static byte[] masterLine = "2222222222222222222222222222222222222222 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to master\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	static byte[] headLine = "3333333333333333333333333333333333333333 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to HEAD\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	static byte[] oneLineWithoutComment = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	static byte[] switchBranch = "0d43a6890a19fd657faad1c4cfbe3cb1b47851c3 4809df9c0d8bce5b00955563f77c5a9f25aa0d12 A O Thor Too <authortoo@wri.tr> 1315088009 +0200\tcheckout: moving from new/work to master\n"
-			.getBytes();
+			.getBytes(UTF_8);
 
 	@Test
 	public void testReadOneLine() throws Exception {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogWriterTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogWriterTest.java
index d7e601e65..a84be7e9f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogWriterTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogWriterTest.java
@@ -74,7 +74,7 @@ public class ReflogWriterTest extends SampleDataRepositoryTestCase {
 		writer.log("refs/heads/master", oldId, newId, ident,
 				"stash: Add\nmessage\r\nwith line feeds");
 
-		byte[] buffer = new byte[oneLine.getBytes().length];
+		byte[] buffer = new byte[oneLine.getBytes(UTF_8).length];
 		readReflog(buffer);
 		assertEquals(oneLine, new String(buffer, UTF_8));
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java
index 6e2cddb4c..30a07421a 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java
@@ -48,6 +48,7 @@
 
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.concurrent.TimeUnit.HOURS;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
@@ -812,7 +813,7 @@ public class ConfigTest {
 	public void testIncludeTooManyRecursions() throws IOException {
 		File config = tmp.newFile("config");
 		String include = "[include]\npath=" + pathToString(config) + "\n";
-		Files.write(config.toPath(), include.getBytes());
+		Files.write(config.toPath(), include.getBytes(UTF_8));
 		try {
 			loadConfig(config);
 			fail();
@@ -833,7 +834,7 @@ public class ConfigTest {
 		File config = tmp.newFile("config");
 
 		String fooBar = "[foo]\nbar=true\n";
-		Files.write(config.toPath(), fooBar.getBytes());
+		Files.write(config.toPath(), fooBar.getBytes(UTF_8));
 
 		Config parsed = parse("[include]\npath=" + pathToString(config) + "\n");
 		assertFalse(parsed.getBoolean("foo", "bar", false));
@@ -844,11 +845,11 @@ public class ConfigTest {
 			throws IOException, ConfigInvalidException {
 		File included = tmp.newFile("included");
 		String content = "[foo]\nbar=true\n";
-		Files.write(included.toPath(), content.getBytes());
+		Files.write(included.toPath(), content.getBytes(UTF_8));
 
 		File config = tmp.newFile("config");
 		content = "[Include]\npath=" + pathToString(included) + "\n";
-		Files.write(config.toPath(), content.getBytes());
+		Files.write(config.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(config);
 		assertTrue(fbConfig.getBoolean("foo", "bar", false));
@@ -859,11 +860,11 @@ public class ConfigTest {
 			throws IOException, ConfigInvalidException {
 		File included = tmp.newFile("included");
 		String content = "[foo]\nbar=true\n";
-		Files.write(included.toPath(), content.getBytes());
+		Files.write(included.toPath(), content.getBytes(UTF_8));
 
 		File config = tmp.newFile("config");
 		content = "[include]\nPath=" + pathToString(included) + "\n";
-		Files.write(config.toPath(), content.getBytes());
+		Files.write(config.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(config);
 		assertTrue(fbConfig.getBoolean("foo", "bar", false));
@@ -886,11 +887,11 @@ public class ConfigTest {
 		File included = tmp.newFile("included");
 		String includedPath = pathToString(included);
 		String content = "[include]\npath=\n";
-		Files.write(included.toPath(), content.getBytes());
+		Files.write(included.toPath(), content.getBytes(UTF_8));
 
 		File config = tmp.newFile("config");
 		String include = "[include]\npath=" + includedPath + "\n";
-		Files.write(config.toPath(), include.getBytes());
+		Files.write(config.toPath(), include.getBytes(UTF_8));
 		try {
 			loadConfig(config);
 			fail("Expected ConfigInvalidException");
@@ -917,7 +918,7 @@ public class ConfigTest {
 				21, 31, CoreConfig.AutoCRLF.FALSE,
 				"+refs/heads/*:refs/remotes/origin/*") + "\n[include]\npath="
 				+ pathToString(includedFile);
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_ORIGIN, REFS_UPSTREAM);
@@ -940,7 +941,7 @@ public class ConfigTest {
 				+ createAllTypesSampleContent("Alice Parker", false, 11, 21, 31,
 						CoreConfig.AutoCRLF.FALSE,
 						"+refs/heads/*:refs/remotes/origin/*");
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsConfig(fbConfig, REFS_UPSTREAM, REFS_ORIGIN);
@@ -960,7 +961,7 @@ public class ConfigTest {
 
 		File configFile = tmp.newFile("config");
 		String content = "[include]\npath=" + pathToString(includedFile);
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_UPSTREAM);
@@ -981,7 +982,7 @@ public class ConfigTest {
 		File configFile = tmp.newFile("config");
 		String content = "[user]\n[include]\npath="
 				+ pathToString(includedFile);
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_UPSTREAM);
@@ -1003,7 +1004,7 @@ public class ConfigTest {
 		File configFile = tmp.newFile("config");
 		String content = "[include]\npath=" + pathToString(includedFile)
 				+ "\n[user]";
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_UPSTREAM);
@@ -1024,7 +1025,7 @@ public class ConfigTest {
 		File configFile = tmp.newFile("config");
 		String content = "[user]\nemail=alice@home\n[include]\npath="
 				+ pathToString(includedFile);
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_UPSTREAM);
@@ -1046,7 +1047,7 @@ public class ConfigTest {
 		File configFile = tmp.newFile("config");
 		String content = "[include]\npath=" + pathToString(includedFile)
 				+ "\n[user]\nemail=alice@home\n";
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 		assertValuesAsIncluded(fbConfig, REFS_UPSTREAM);
@@ -1066,13 +1067,13 @@ public class ConfigTest {
 		RefSpec includedRefSpec = new RefSpec(REFS_UPSTREAM);
 		String includedContent = "[remote \"origin\"]\n" + "fetch="
 				+ includedRefSpec;
-		Files.write(includedFile.toPath(), includedContent.getBytes());
+		Files.write(includedFile.toPath(), includedContent.getBytes(UTF_8));
 
 		File configFile = tmp.newFile("config");
 		RefSpec refSpec = new RefSpec(REFS_ORIGIN);
 		String content = "[include]\npath=" + pathToString(includedFile) + "\n"
 				+ "[remote \"origin\"]\n" + "fetch=" + refSpec;
-		Files.write(configFile.toPath(), content.getBytes());
+		Files.write(configFile.toPath(), content.getBytes(UTF_8));
 
 		FileBasedConfig fbConfig = loadConfig(configFile);
 
@@ -1094,7 +1095,7 @@ public class ConfigTest {
 		String includedContent = createAllTypesSampleContent("Alice Muller",
 				true, 10, 20, 30, CoreConfig.AutoCRLF.TRUE,
 				"+refs/heads/*:refs/remotes/upstream/*");
-		Files.write(includedFile.toPath(), includedContent.getBytes());
+		Files.write(includedFile.toPath(), includedContent.getBytes(UTF_8));
 		return includedFile;
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutMaliciousPathTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutMaliciousPathTest.java
index 32a1ec96a..057e0c881 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutMaliciousPathTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutMaliciousPathTest.java
@@ -37,6 +37,7 @@
  */
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -343,7 +344,7 @@ public class DirCacheCheckoutMaliciousPathTest extends RepositoryTestCase {
 			ObjectInserter newObjectInserter;
 			newObjectInserter = git.getRepository().newObjectInserter();
 			ObjectId blobId = newObjectInserter.insert(Constants.OBJ_BLOB,
-					"data".getBytes());
+					"data".getBytes(UTF_8));
 			newObjectInserter = git.getRepository().newObjectInserter();
 			FileMode mode = FileMode.REGULAR_FILE;
 			ObjectId insertId = blobId;
@@ -366,8 +367,8 @@ public class DirCacheCheckoutMaliciousPathTest extends RepositoryTestCase {
 			insertId = blobId;
 			for (int i = path.length - 1; i >= 0; --i) {
 				TreeFormatter treeFormatter = new TreeFormatter();
-				treeFormatter.append(path[i].getBytes(), 0,
-							path[i].getBytes().length,
+				treeFormatter.append(path[i].getBytes(UTF_8), 0,
+						path[i].getBytes(UTF_8).length,
 							mode, insertId, true);
 				insertId = newObjectInserter.insert(treeFormatter);
 				mode = FileMode.TREE;
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutTest.java
index eb8782780..7cb91a206 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/DirCacheCheckoutTest.java
@@ -40,6 +40,7 @@
  */
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -310,7 +311,7 @@ public class DirCacheCheckoutTest extends RepositoryTestCase {
 			assertTrue("unexpected content for path " + path
 					+ " in index. Expected: <" + expectedValue + ">",
 					Arrays.equals(db.open(read.getEntry(j).getObjectId())
-							.getCachedBytes(), i.get(path).getBytes()));
+							.getCachedBytes(), i.get(path).getBytes(UTF_8)));
 		}
 	}
 
@@ -405,7 +406,7 @@ public class DirCacheCheckoutTest extends RepositoryTestCase {
 
 	ObjectId genSha1(String data) {
 		try (ObjectInserter w = db.newObjectInserter()) {
-			ObjectId id = w.insert(Constants.OBJ_BLOB, data.getBytes());
+			ObjectId id = w.insert(Constants.OBJ_BLOB, data.getBytes(UTF_8));
 			w.flush();
 			return id;
 		} catch (IOException e) {
@@ -2048,7 +2049,7 @@ public class DirCacheCheckoutTest extends RepositoryTestCase {
 						assertArrayEquals(
 								"unexpected content for path " + path
 										+ " in workDir. ",
-								buffer, i.get(path).getBytes());
+								buffer, i.get(path).getBytes(UTF_8));
 					}
 					nrFiles++;
 				} else if (file.isDirectory()) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
index ac142ed32..7d2c4a278 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
@@ -45,6 +45,7 @@
 
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.junit.Assert.assertEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -261,7 +262,7 @@ public class RefTest extends SampleDataRepositoryTestCase {
 		assertEquals(Storage.PACKED, ref.getStorage());
 		try (FileOutputStream os = new FileOutputStream(
 				new File(db.getDirectory(), "refs/heads/master"))) {
-			os.write(ref.getObjectId().name().getBytes());
+			os.write(ref.getObjectId().name().getBytes(UTF_8));
 			os.write('\n');
 		}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
index 777a784c3..b401d2bea 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
@@ -101,14 +101,14 @@ public class FileBasedConfigTest {
 
 	@Test
 	public void testSystemEncoding() throws IOException, ConfigInvalidException {
-		final File file = createFile(CONTENT1.getBytes());
+		final File file = createFile(CONTENT1.getBytes(UTF_8));
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
 		config.load();
 		assertEquals(ALICE, config.getString(USER, null, NAME));
 
 		config.setString(USER, null, NAME, BOB);
 		config.save();
-		assertArrayEquals(CONTENT2.getBytes(), IO.readFully(file));
+		assertArrayEquals(CONTENT2.getBytes(UTF_8), IO.readFully(file));
 	}
 
 	@Test
@@ -120,7 +120,7 @@ public class FileBasedConfigTest {
 
 		config.setString(USER, null, NAME, BOB);
 		config.save();
-		assertArrayEquals(CONTENT2.getBytes(), IO.readFully(file));
+		assertArrayEquals(CONTENT2.getBytes(UTF_8), IO.readFully(file));
 	}
 
 	@Test
@@ -150,8 +150,8 @@ public class FileBasedConfigTest {
 	@Test
 	public void testLeadingWhitespaces() throws IOException, ConfigInvalidException {
 		final ByteArrayOutputStream bos1 = new ByteArrayOutputStream();
-		bos1.write(" \n\t".getBytes());
-		bos1.write(CONTENT1.getBytes());
+		bos1.write(" \n\t".getBytes(UTF_8));
+		bos1.write(CONTENT1.getBytes(UTF_8));
 
 		final File file = createFile(bos1.toByteArray());
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -162,18 +162,18 @@ public class FileBasedConfigTest {
 		config.save();
 
 		final ByteArrayOutputStream bos2 = new ByteArrayOutputStream();
-		bos2.write(" \n\t".getBytes());
-		bos2.write(CONTENT2.getBytes());
+		bos2.write(" \n\t".getBytes(UTF_8));
+		bos2.write(CONTENT2.getBytes(UTF_8));
 		assertArrayEquals(bos2.toByteArray(), IO.readFully(file));
 	}
 
 	@Test
 	public void testIncludeAbsolute()
 			throws IOException, ConfigInvalidException {
-		final File includedFile = createFile(CONTENT1.getBytes());
+		final File includedFile = createFile(CONTENT1.getBytes(UTF_8));
 		final ByteArrayOutputStream bos = new ByteArrayOutputStream();
-		bos.write("[include]\npath=".getBytes());
-		bos.write(pathToString(includedFile).getBytes());
+		bos.write("[include]\npath=".getBytes(UTF_8));
+		bos.write(pathToString(includedFile).getBytes(UTF_8));
 
 		final File file = createFile(bos.toByteArray());
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -184,10 +184,10 @@ public class FileBasedConfigTest {
 	@Test
 	public void testIncludeRelativeDot()
 			throws IOException, ConfigInvalidException {
-		final File includedFile = createFile(CONTENT1.getBytes(), "dir1");
+		final File includedFile = createFile(CONTENT1.getBytes(UTF_8), "dir1");
 		final ByteArrayOutputStream bos = new ByteArrayOutputStream();
-		bos.write("[include]\npath=".getBytes());
-		bos.write(("./" + includedFile.getName()).getBytes());
+		bos.write("[include]\npath=".getBytes(UTF_8));
+		bos.write(("./" + includedFile.getName()).getBytes(UTF_8));
 
 		final File file = createFile(bos.toByteArray(), "dir1");
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -198,11 +198,11 @@ public class FileBasedConfigTest {
 	@Test
 	public void testIncludeRelativeDotDot()
 			throws IOException, ConfigInvalidException {
-		final File includedFile = createFile(CONTENT1.getBytes(), "dir1");
+		final File includedFile = createFile(CONTENT1.getBytes(UTF_8), "dir1");
 		final ByteArrayOutputStream bos = new ByteArrayOutputStream();
-		bos.write("[include]\npath=".getBytes());
+		bos.write("[include]\npath=".getBytes(UTF_8));
 		bos.write(("../" + includedFile.getParentFile().getName() + "/"
-				+ includedFile.getName()).getBytes());
+				+ includedFile.getName()).getBytes(UTF_8));
 
 		final File file = createFile(bos.toByteArray(), "dir2");
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -213,10 +213,10 @@ public class FileBasedConfigTest {
 	@Test
 	public void testIncludeRelativeDotDotNotFound()
 			throws IOException, ConfigInvalidException {
-		final File includedFile = createFile(CONTENT1.getBytes());
+		final File includedFile = createFile(CONTENT1.getBytes(UTF_8));
 		final ByteArrayOutputStream bos = new ByteArrayOutputStream();
-		bos.write("[include]\npath=".getBytes());
-		bos.write(("../" + includedFile.getName()).getBytes());
+		bos.write("[include]\npath=".getBytes(UTF_8));
+		bos.write(("../" + includedFile.getName()).getBytes(UTF_8));
 
 		final File file = createFile(bos.toByteArray());
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -227,10 +227,10 @@ public class FileBasedConfigTest {
 	@Test
 	public void testIncludeWithTilde()
 			throws IOException, ConfigInvalidException {
-		final File includedFile = createFile(CONTENT1.getBytes(), "home");
+		final File includedFile = createFile(CONTENT1.getBytes(UTF_8), "home");
 		final ByteArrayOutputStream bos = new ByteArrayOutputStream();
-		bos.write("[include]\npath=".getBytes());
-		bos.write(("~/" + includedFile.getName()).getBytes());
+		bos.write("[include]\npath=".getBytes(UTF_8));
+		bos.write(("~/" + includedFile.getName()).getBytes(UTF_8));
 
 		final File file = createFile(bos.toByteArray(), "repo");
 		final FS fs = FS.DETECTED.newInstance();
@@ -246,7 +246,7 @@ public class FileBasedConfigTest {
 			throws IOException, ConfigInvalidException {
 		// use a content with multiple sections and multiple key/value pairs
 		// because code for first line works different than for subsequent lines
-		final File includedFile = createFile(CONTENT3.getBytes(), "dir1");
+		final File includedFile = createFile(CONTENT3.getBytes(UTF_8), "dir1");
 
 		final File file = createFile(new byte[0], "dir2");
 		FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/InterIndexDiffFilterTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/InterIndexDiffFilterTest.java
index cba35d804..ea5db0934 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/InterIndexDiffFilterTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/InterIndexDiffFilterTest.java
@@ -42,6 +42,7 @@
  */
 package org.eclipse.jgit.treewalk.filter;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -114,7 +115,7 @@ public class InterIndexDiffFilterTest extends LocalDiskRepositoryTestCase {
 	}
 
 	private ObjectId id(String data) {
-		byte[] bytes = data.getBytes();
+		byte[] bytes = data.getBytes(UTF_8);
 		return db.newObjectInserter().idFor(Constants.OBJ_BLOB, bytes);
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RunExternalScriptTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RunExternalScriptTest.java
index d92293bde..19af83611 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RunExternalScriptTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RunExternalScriptTest.java
@@ -76,7 +76,7 @@ public class RunExternalScriptTest {
 		File script = writeTempFile("cat -");
 		int rc = FS.DETECTED.runProcess(
 				new ProcessBuilder("sh", script.getPath()), out, err,
-				new ByteArrayInputStream(inputStr.getBytes()));
+				new ByteArrayInputStream(inputStr.getBytes(UTF_8)));
 		assertEquals(0, rc);
 		assertEquals(inputStr, new String(out.toByteArray(), UTF_8));
 		assertEquals("", new String(err.toByteArray(), UTF_8));
@@ -143,7 +143,7 @@ public class RunExternalScriptTest {
 		File script = writeTempFile("echo $#,$1,$2,$3,$4,$5,$6 >&2 ; cat -; exit 5");
 		int rc = FS.DETECTED.runProcess(
 				new ProcessBuilder("sh", script.getPath(), "a", "b", "c"),
-				out, err, new ByteArrayInputStream(inputStr.getBytes()));
+				out, err, new ByteArrayInputStream(inputStr.getBytes(UTF_8)));
 		assertEquals(5, rc);
 		assertEquals(inputStr, new String(out.toByteArray(), UTF_8));
 		assertEquals("3,a,b,c,,," + LF, new String(err.toByteArray(), UTF_8));
@@ -173,7 +173,7 @@ public class RunExternalScriptTest {
 		File script = writeTempFile("cat -");
 		ProcessBuilder pb = new ProcessBuilder("sh", script.getPath());
 		ExecutionResult res = FS.DETECTED.execute(pb,
-				new ByteArrayInputStream(inputStr.getBytes()));
+				new ByteArrayInputStream(inputStr.getBytes(UTF_8)));
 		assertEquals(0, res.getRc());
 		assertEquals(inputStr,
 				new String(res.getStdout().toByteArray(), UTF_8));
@@ -200,7 +200,7 @@ public class RunExternalScriptTest {
 		ProcessBuilder pb = new ProcessBuilder("sh", script.getPath(), "a",
 				"b", "c");
 		ExecutionResult res = FS.DETECTED.execute(pb,
-				new ByteArrayInputStream(inputStr.getBytes()));
+				new ByteArrayInputStream(inputStr.getBytes(UTF_8)));
 		assertEquals(5, res.getRc());
 		assertEquals(inputStr,
 				new String(res.getStdout().toByteArray(), UTF_8));
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFInputStreamTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFInputStreamTest.java
index 1272e1617..8f77c55af 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFInputStreamTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFInputStreamTest.java
@@ -43,6 +43,8 @@
 
 package org.eclipse.jgit.util.io;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -89,8 +91,8 @@ public class AutoCRLFInputStreamTest {
 
 	private void assertNoCrLfHelper(String expect, String input)
 			throws IOException {
-		byte[] inbytes = input.getBytes();
-		byte[] expectBytes = expect.getBytes();
+		byte[] inbytes = input.getBytes(UTF_8);
+		byte[] expectBytes = expect.getBytes(UTF_8);
 		for (int i = 0; i < 5; ++i) {
 			byte[] buf = new byte[i];
 			try (ByteArrayInputStream bis = new ByteArrayInputStream(inbytes);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFOutputStreamTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFOutputStreamTest.java
index 065582731..3a3dc8117 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFOutputStreamTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoCRLFOutputStreamTest.java
@@ -44,6 +44,8 @@
 
 package org.eclipse.jgit.util.io;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -91,8 +93,8 @@ public class AutoCRLFOutputStreamTest {
 
 	private void assertNoCrLfHelper(String expect, String input)
 			throws IOException {
-		byte[] inbytes = input.getBytes();
-		byte[] expectBytes = expect.getBytes();
+		byte[] inbytes = input.getBytes(UTF_8);
+		byte[] expectBytes = expect.getBytes(UTF_8);
 		for (int i = -4; i < 5; ++i) {
 			int size = Math.abs(i);
 			byte[] buf = new byte[size];