Add experimental support for Java 16 (#1059)

.travis.sh

@@ -75,6 +75,9 @@ case "$JDK" in
 15-ea)
   install_jdk $JDK15_EA_URL
   ;;
+16-ea)
+  install_jdk $JDK16_EA_URL
+  ;;
 esac
 
 # Do not use "~/.mavenrc" set by Travis (https://github.com/travis-ci/travis-ci/issues/3893),
@@ -110,6 +113,10 @@ case "$JDK" in
   mvn -V -B -e verify -Dbytecode.version=15 \
     --settings=./.travis/settings.xml
   ;;
+16-ea)
+  mvn -V -B -e verify -Dbytecode.version=16 \
+    --settings=./.travis/settings.xml
+  ;;
 *)
   echo "Incorrect JDK [$JDK]"
   exit 1;

.travis.yml

@@ -31,5 +31,6 @@ env:
   - JDK=13
   - JDK=14
   - JDK=15-ea
+  - JDK=16-ea
 
 script: ./.travis.sh

org.jacoco.build/pom.xml

@@ -841,6 +841,20 @@
       </properties>
     </profile>
 
+    <profile>
+      <id>java16-bytecode</id>
+      <activation>
+        <property>
+          <name>bytecode.version</name>
+          <value>16</value>
+        </property>
+      </activation>
+      <properties>
+        <maven.compiler.source>13</maven.compiler.source>
+        <maven.compiler.target>13</maven.compiler.target>
+      </properties>
+    </profile>
+
     <!-- This profile enables use of ECJ -->
     <profile>
       <id>ecj</id>

org.jacoco.core.test.validation/pom.xml

@@ -246,6 +246,31 @@
         <module>../org.jacoco.core.test.validation.scala</module>
       </modules>
     </profile>
+
+    <profile>
+      <id>java16-bytecode</id>
+      <activation>
+        <property>
+          <name>bytecode.version</name>
+          <value>16</value>
+        </property>
+      </activation>
+      <properties>
+        <!-- see respective profile in org.jacoco.build about this override -->
+        <maven.compiler.source>16</maven.compiler.source>
+        <maven.compiler.target>16</maven.compiler.target>
+      </properties>
+      <modules>
+        <module>../org.jacoco.core.test.validation.kotlin</module>
+        <module>../org.jacoco.core.test.validation.java7</module>
+        <module>../org.jacoco.core.test.validation.java8</module>
+        <module>../org.jacoco.core.test.validation.java14</module>
+        <!-- Groovy 2.5.8 doesn't support bytecode version 16
+        <module>../org.jacoco.core.test.validation.groovy</module>
+        -->
+        <module>../org.jacoco.core.test.validation.scala</module>
+      </modules>
+    </profile>
   </profiles>
 
 </project>

org.jacoco.core.test/src/org/jacoco/core/analysis/AnalyzerTest.java

@@ -107,7 +107,7 @@ public void should_ignore_synthetic_classes() throws Exception {
 	@Test
 	public void should_not_modify_class_bytes_to_support_next_version()
 			throws Exception {
-		final byte[] originalBytes = createClass(Opcodes.V14 + 1);
+		final byte[] originalBytes = createClass(Opcodes.V15 + 1);
 		final byte[] bytes = new byte[originalBytes.length];
 		System.arraycopy(originalBytes, 0, bytes, 0, originalBytes.length);
 		final long expectedClassId = CRC64.classId(bytes);
@@ -130,14 +130,14 @@ private static byte[] createClass(final int version) {
 	 */
 	@Test
 	public void analyzeClass_should_throw_exception_for_unsupported_class_file_version() {
-		final byte[] bytes = createClass(Opcodes.V14 + 2);
+		final byte[] bytes = createClass(Opcodes.V15 + 2);
 		try {
 			analyzer.analyzeClass(bytes, "UnsupportedVersion");
 			fail("exception expected");
 		} catch (IOException e) {
 			assertEquals("Error while analyzing UnsupportedVersion.",
 					e.getMessage());
-			assertEquals("Unsupported class file major version 60",
+			assertEquals("Unsupported class file major version 61",
 					e.getCause().getMessage());
 		}
 	}
@@ -217,15 +217,15 @@ public void testAnalyzeClass_BrokenStream() throws IOException {
 	 */
 	@Test
 	public void analyzeAll_should_throw_exception_for_unsupported_class_file_version() {
-		final byte[] bytes = createClass(Opcodes.V14 + 2);
+		final byte[] bytes = createClass(Opcodes.V15 + 2);
 		try {
 			analyzer.analyzeAll(new ByteArrayInputStream(bytes),
 					"UnsupportedVersion");
 			fail("exception expected");
 		} catch (IOException e) {
 			assertEquals("Error while analyzing UnsupportedVersion.",
 					e.getMessage());
-			assertEquals("Unsupported class file major version 60",
+			assertEquals("Unsupported class file major version 61",
 					e.getCause().getMessage());
 		}
 	}

org.jacoco.core.test/src/org/jacoco/core/instr/ClassFileVersionsTest.java

@@ -29,6 +29,7 @@
 import static org.objectweb.asm.Opcodes.V12;
 import static org.objectweb.asm.Opcodes.V13;
 import static org.objectweb.asm.Opcodes.V14;
+import static org.objectweb.asm.Opcodes.V15;
 import static org.objectweb.asm.Opcodes.V1_1;
 import static org.objectweb.asm.Opcodes.V1_2;
 import static org.objectweb.asm.Opcodes.V1_3;
@@ -129,7 +130,12 @@ public void test_14() throws IOException {
 
 	@Test
 	public void test_15() throws IOException {
-		testVersion(V14 + 1, true);
+		testVersion(V15, true);
+	}
+
+	@Test
+	public void test_16() throws IOException {
+		testVersion(V15 + 1, true);
 	}
 
 	private void testVersion(int version, boolean frames) throws IOException {

org.jacoco.core.test/src/org/jacoco/core/instr/InstrumenterTest.java

@@ -99,7 +99,7 @@ public void setup() throws Exception {
 	@Test
 	public void should_not_modify_class_bytes_to_support_next_version()
 			throws Exception {
-		final byte[] originalBytes = createClass(Opcodes.V14 + 1);
+		final byte[] originalBytes = createClass(Opcodes.V15 + 1);
 		final byte[] bytes = new byte[originalBytes.length];
 		System.arraycopy(originalBytes, 0, bytes, 0, originalBytes.length);
 		final long expectedClassId = CRC64.classId(bytes);
@@ -122,14 +122,14 @@ private static byte[] createClass(final int version) {
 	 */
 	@Test
 	public void instrument_should_throw_exception_for_unsupported_class_file_version() {
-		final byte[] bytes = createClass(Opcodes.V14 + 2);
+		final byte[] bytes = createClass(Opcodes.V15 + 2);
 		try {
 			instrumenter.instrument(bytes, "UnsupportedVersion");
 			fail("exception expected");
 		} catch (final IOException e) {
 			assertEquals("Error while instrumenting UnsupportedVersion.",
 					e.getMessage());
-			assertEquals("Unsupported class file major version 60",
+			assertEquals("Unsupported class file major version 61",
 					e.getCause().getMessage());
 		}
 	}
@@ -224,15 +224,15 @@ public void testSerialization() throws Exception {
 	 */
 	@Test
 	public void instrumentAll_should_throw_exception_for_unsupported_class_file_version() {
-		final byte[] bytes = createClass(Opcodes.V14 + 2);
+		final byte[] bytes = createClass(Opcodes.V15 + 2);
 		try {
 			instrumenter.instrumentAll(new ByteArrayInputStream(bytes),
 					new ByteArrayOutputStream(), "UnsupportedVersion");
 			fail("exception expected");
 		} catch (final IOException e) {
 			assertEquals("Error while instrumenting UnsupportedVersion.",
 					e.getMessage());
-			assertEquals("Unsupported class file major version 60",
+			assertEquals("Unsupported class file major version 61",
 					e.getCause().getMessage());
 		}
 	}

org.jacoco.core.test/src/org/jacoco/core/internal/instr/InstrSupportTest.java

@@ -43,8 +43,8 @@ public void setup() {
 	}
 
 	@Test
-	public void classReaderFor_should_read_java_15_class() {
-		final byte[] bytes = createJava15Class();
+	public void classReaderFor_should_read_java_16_class() {
+		final byte[] bytes = createJava16Class();
 
 		final ClassReader classReader = InstrSupport.classReaderFor(bytes);
 
@@ -53,16 +53,16 @@ public void classReaderFor_should_read_java_15_class() {
 			public void visit(final int version, final int access,
 					final String name, final String signature,
 					final String superName, final String[] interfaces) {
-				assertEquals(Opcodes.V14 + 1, version);
+				assertEquals(Opcodes.V15 + 1, version);
 			}
 		}, 0);
 
-		assertArrayEquals(createJava15Class(), bytes);
+		assertArrayEquals(createJava16Class(), bytes);
 	}
 
-	private static byte[] createJava15Class() {
+	private static byte[] createJava16Class() {
 		final ClassWriter cw = new ClassWriter(0);
-		cw.visit(Opcodes.V14 + 1, 0, "Foo", null, "java/lang/Object", null);
+		cw.visit(Opcodes.V15 + 1, 0, "Foo", null, "java/lang/Object", null);
 		cw.visitEnd();
 		return cw.toByteArray();
 	}
@@ -126,7 +126,8 @@ public void needFrames_should_return_true_for_versions_greater_than_or_equal_to_
 		assertTrue(InstrSupport.needsFrames(Opcodes.V12));
 		assertTrue(InstrSupport.needsFrames(Opcodes.V13));
 		assertTrue(InstrSupport.needsFrames(Opcodes.V14));
-		assertTrue(InstrSupport.needsFrames(Opcodes.V14 + 1));
+		assertTrue(InstrSupport.needsFrames(Opcodes.V15));
+		assertTrue(InstrSupport.needsFrames(Opcodes.V15 + 1));
 
 		assertTrue(InstrSupport.needsFrames(0x0100));
 	}

org.jacoco.core/src/org/jacoco/core/internal/instr/InstrSupport.java

@@ -273,9 +273,9 @@ public static void push(final MethodVisitor mv, final int value) {
 	 */
 	public static ClassReader classReaderFor(final byte[] b) {
 		final int originalVersion = getMajorVersion(b);
-		if (originalVersion == Opcodes.V14 + 1) {
+		if (originalVersion == Opcodes.V15 + 1) {
 			// temporarily downgrade version to bypass check in ASM
-			setMajorVersion(Opcodes.V14, b);
+			setMajorVersion(Opcodes.V15, b);
 		}
 		final ClassReader classReader = new ClassReader(b);
 		setMajorVersion(originalVersion, b);

org.jacoco.doc/docroot/doc/changes.html

@@ -25,6 +25,8 @@ <h3>New Features</h3>
   <li>JaCoCo now officially supports Java 14.</li>
   <li>Experimental support for Java 15 class files
       (GitHub <a href="https://github.com/jacoco/jacoco/issues/992">#992</a>).</li>
+  <li>Experimental support for Java 16 class files
+      (GitHub <a href="https://github.com/jacoco/jacoco/issues/1059">#1059</a>).</li>
   <li>Methods <code>toString</code>, <code>hashCode</code> and <code>equals</code>
       generated by compiler for records are filtered out during generation of report
       (GitHub <a href="https://github.com/jacoco/jacoco/issues/990">#990</a>).</li>