Merge pull request #73 from kriegaex/ajc-release-option

Enable AJC compilation with `--release`

bcel-builder/src/main/java/org/aspectj/apache/bcel/Constants.java

@@ -96,8 +96,10 @@ public interface Constants {
 	short MINOR_15 = 0;
 	short MAJOR_16 = 60;
 	short MINOR_16 = 0;
-//	short MAJOR_17 = 61;
-//	short MINOR_17 = 0;
+	short MAJOR_17 = 61;
+	short MINOR_17 = 0;
+//	short MAJOR_18 = 62;
+//	short MINOR_18 = 0;
 
 	int PREVIEW_MINOR_VERSION = 65535;
 

org.aspectj.ajdt.core/src/main/java/org/aspectj/ajdt/ajc/BuildArgParser.java

@@ -415,6 +415,10 @@ public class BuildArgParser extends Main {
 		return ret;
 	}
 
+	public FileSystem.Classpath[] getCheckedClasspaths() {
+		return checkedClasspaths;
+	}
+
 	private void addExtDirs(String extdirs, List classpathCollector) {
 		StringTokenizer tokenizer = new StringTokenizer(extdirs, File.pathSeparator);
 		while (tokenizer.hasMoreTokens()) {

org.aspectj.ajdt.core/src/main/java/org/aspectj/ajdt/internal/core/builder/AjBuildConfig.java

@@ -19,17 +19,20 @@ package org.aspectj.ajdt.internal.core.builder;
 import java.io.File;
 import java.io.FileFilter;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.StringTokenizer;
+import java.util.stream.Collectors;
 
 import org.aspectj.ajdt.ajc.BuildArgParser;
 import org.aspectj.ajdt.internal.compiler.CompilationResultDestinationManager;
+import org.aspectj.org.eclipse.jdt.internal.compiler.batch.ClasspathJep247;
 import org.aspectj.org.eclipse.jdt.internal.compiler.batch.ClasspathLocation;
 import org.aspectj.org.eclipse.jdt.internal.compiler.batch.FileSystem;
 import org.aspectj.org.eclipse.jdt.internal.compiler.batch.FileSystem.Classpath;
@@ -930,7 +933,18 @@ public class AjBuildConfig implements CompilerConfigurationChangeFlags {
 
 		// ArrayList<Classpath> allPaths = handleBootclasspath(bootclasspaths, customEncoding);
 		ArrayList<FileSystem.Classpath> allPaths = new ArrayList<>();
-	 	allPaths.addAll(processStringPath(bootclasspath, encoding));
+		if (
+			Arrays.stream(buildArgParser.getCheckedClasspaths())
+				.anyMatch(cp -> cp instanceof ClasspathJep247)
+		) {
+			allPaths.addAll(
+				Arrays.stream(buildArgParser.getCheckedClasspaths())
+					.filter(cp -> cp instanceof ClasspathJep247)
+					.collect(Collectors.toList())
+			);
+		}
+		else
+			allPaths.addAll(processStringPath(bootclasspath, encoding));
 		allPaths.addAll(processFilePath(inJars, encoding));
 	 	allPaths.addAll(processFilePath(inPath, encoding));
 	 	allPaths.addAll(processFilePath(aspectpath, encoding));
@@ -943,12 +957,7 @@ public class AjBuildConfig implements CompilerConfigurationChangeFlags {
 	 	// The classpath is done after modules to give precedence to modules that share the
 	 	// same paths as classpath elements (the upcoming normalize will remove later dups)
 	 	allPaths.addAll(processStringPath(classpath, encoding));
-	 	for (Iterator<FileSystem.Classpath> iter = allPaths.iterator();iter.hasNext();) {
-	 		Classpath next = iter.next();
-	 		if (next == null) {
-	 			iter.remove();
-	 		}
-	 	}
+    allPaths.removeIf(Objects::isNull);
 		allPaths = FileSystem.ClasspathNormalizer.normalize(allPaths);
 		this.checkedClasspaths = new FileSystem.Classpath[allPaths.size()];
 		allPaths.toArray(this.checkedClasspaths);

testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava17Only.java

@@ -0,0 +1,39 @@
+/* *******************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ * ******************************************************************/
+package org.aspectj.testing;
+
+import org.aspectj.util.LangUtil;
+
+/**
+ * Makes sure tests are running on the right level of JDK.
+ *
+ * @author Alexander Kriegisch
+ */
+public abstract class XMLBasedAjcTestCaseForJava17Only extends XMLBasedAjcTestCase {
+
+	@Override
+	public void setUp() throws Exception {
+		// Activate this block after upgrading to JDT Core Java 18
+		/*
+		throw new IllegalStateException(
+			"These tests need a Java 17 level AspectJ compiler " +
+				"(e.g. because they use version-specific preview features). " +
+				"This compiler does not support preview features of a previous version anymore."
+		);
+		*/
+		if (!LangUtil.is17VMOrGreater() || LangUtil.is18VMOrGreater()) {
+			throw new IllegalStateException(
+				"These tests should be run on Java 17 only " +
+				"(e.g. because they use version-specific preview features)"
+			);
+		}
+		super.setUp();
+	}
+
+}

testing/src/test/java/org/aspectj/testing/XMLBasedAjcTestCaseForJava17OrLater.java

@@ -0,0 +1,27 @@
+/* *******************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ * ******************************************************************/
+package org.aspectj.testing;
+
+import org.aspectj.util.LangUtil;
+
+/**
+ * Makes sure tests are running on the right level of JDK.
+ *
+ * @author Alexander Kriegisch
+ */
+public abstract class XMLBasedAjcTestCaseForJava17OrLater extends XMLBasedAjcTestCase {
+
+	@Override
+	public void setUp() throws Exception {
+		if (!LangUtil.is17VMOrGreater())
+			throw new IllegalStateException("These tests should be run on Java 17 or later");
+		super.setUp();
+	}
+
+}

tests/features198/compiler_release/Buffers.java

@@ -0,0 +1,20 @@
+import java.nio.Buffer;
+import java.nio.ByteBuffer;
+
+public class Buffers {
+  /**
+   * Running this method will fail during runtime on JDK 8, if compiled on JDK 9+ with {@code -source 8 -target 8},
+   * because the API has changed: In JDK 8 there was only {@code Buffer.flip()}, but since JDK 9 it is overloaded by
+   * {@code ByteBuffer.flip()}.
+   * <p>
+   * Therefore, it is imperative to compile against the old API, using the correct boot classpath. On JDK 9+, the
+   * canonical way to do this is to use {@code --release 8}, because the JDK contains a compatibility layer exactly for
+   * this purpose.
+   * <p>
+   * If incorrectly compiled against JDK 9+ API, this will fail with:
+   * <pre>{@code java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer; }</pre>
+   */
+  public static Buffer flip(ByteBuffer buffer) {
+    return buffer.flip();
+  }
+}

tests/src/test/java/org/aspectj/systemtest/AllTests19.java

@@ -17,6 +17,7 @@ import org.aspectj.systemtest.ajc196.AllTestsAspectJ196;
 import junit.framework.Test;
 import junit.framework.TestSuite;
 import org.aspectj.systemtest.ajc197.AllTestsAspectJ197;
+import org.aspectj.systemtest.ajc198.AllTestsAspectJ198;
 
 /**
  * @author Andy Clement
@@ -34,6 +35,7 @@ public class AllTests19 {
 		suite.addTest(AllTestsAspectJ195.suite());
 		suite.addTest(AllTestsAspectJ196.suite());
 		suite.addTest(AllTestsAspectJ197.suite());
+		suite.addTest(AllTestsAspectJ198.suite());
 		suite.addTest(AllTests18.suite());
 		// $JUnit-END$
 		return suite;

tests/src/test/java/org/aspectj/systemtest/ajc198/Ajc198TestsJava.java

@@ -0,0 +1,64 @@
+/*******************************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ *******************************************************************************/
+package org.aspectj.systemtest.ajc198;
+
+import junit.framework.Test;
+import org.aspectj.apache.bcel.Constants;
+import org.aspectj.testing.XMLBasedAjcTestCase;
+import org.aspectj.testing.XMLBasedAjcTestCaseForJava17OrLater;
+
+/**
+ * @author Alexander Kriegisch
+ */
+public class Ajc198TestsJava extends XMLBasedAjcTestCaseForJava17OrLater {
+
+  public void testHiddenClass() {
+    runTest("hidden class");
+    checkVersion("HiddenClassDemo", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testTextBlock1() {
+    runTest("textblock 1");
+    checkVersion("Code", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testTextBlock2() {
+    runTest("textblock 2");
+    checkVersion("Code2", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testRecords() {
+    runTest("simple record");
+    checkVersion("Person", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testRecords2() {
+    runTest("using a record");
+    checkVersion("UsingPersonRecord", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testAdvisingRecords() {
+    runTest("advising records");
+    checkVersion("TraceRecordComponents", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public void testInstanceofPatterns() {
+    runTest("instanceof patterns");
+    checkVersion("Jep305", Constants.MAJOR_17, Constants.MINOR_17);
+  }
+
+  public static Test suite() {
+    return XMLBasedAjcTestCase.loadSuite(Ajc198TestsJava.class);
+  }
+
+  @Override
+  protected java.net.URL getSpecFile() {
+    return getClassResource("ajc198.xml");
+  }
+
+}

tests/src/test/java/org/aspectj/systemtest/ajc198/AllTestsAspectJ198.java

@@ -0,0 +1,33 @@
+/*******************************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ *******************************************************************************/
+package org.aspectj.systemtest.ajc198;
+
+import junit.framework.Test;
+import junit.framework.TestSuite;
+import org.aspectj.util.LangUtil;
+
+/**
+ * @author Alexander Kriegisch
+ */
+public class AllTestsAspectJ198 {
+
+	public static Test suite() {
+		TestSuite suite = new TestSuite("AspectJ 1.9.8 tests");
+		if (LangUtil.is9VMOrGreater()) {
+			suite.addTest(org.aspectj.systemtest.ajc198.CompileWithReleaseTests.suite());
+		}
+		if (LangUtil.is17VMOrGreater()) {
+			suite.addTest(SanityTestsJava17.suite());
+			suite.addTest(Ajc198TestsJava.suite());
+		}
+		if (LangUtil.is17VMOrGreater() && !LangUtil.is18VMOrGreater()) {
+			suite.addTest(Java17PreviewFeaturesTests.suite());
+		}
+		return suite;
+	}
+}

tests/src/test/java/org/aspectj/systemtest/ajc198/CompileWithReleaseTests.java

@@ -0,0 +1,73 @@
+/*******************************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ *******************************************************************************/
+package org.aspectj.systemtest.ajc198;
+
+import junit.framework.Test;
+import org.aspectj.apache.bcel.Constants;
+import org.aspectj.apache.bcel.classfile.JavaClass;
+import org.aspectj.apache.bcel.classfile.Method;
+import org.aspectj.testing.XMLBasedAjcTestCase;
+import org.aspectj.testing.XMLBasedAjcTestCaseForJava9OrLater;
+
+import java.util.Objects;
+
+/**
+ * @author Alexander Kriegisch
+ */
+public class CompileWithReleaseTests extends XMLBasedAjcTestCaseForJava9OrLater {
+
+  /**
+   * In order to avoid a complicated test involving two different JDKs (9+ for compilation, 8 for runtime), we inspect
+   * the byte code of test class {@code Buffers} with BCEL, simply grepping on the disassembled byte code. If compiled
+   * correctly with {@code --release 8}, the byte code should contain the equivalent of a {@code Buffer.flip()} call,
+   * not a {@code ByteBuffer.flip()} one.
+   */
+  public void testCompileToOlderJDKRelease() {
+    runTest("compile to older JDK release");
+
+    // Check compiled byte code version
+    String className = "Buffers";
+    checkVersion(className, Constants.MAJOR_1_8, Constants.MINOR_1_8);
+
+    // Disassemble method and check if Java 8 API is used as expected
+    JavaClass javaClass;
+    try {
+      javaClass = getClassFrom(ajc.getSandboxDirectory(), className);
+    }
+    catch (ClassNotFoundException e) {
+      throw new IllegalStateException("Cannot find class " + className, e);
+    }
+    Method method = Objects.requireNonNull(getMethodFromClass(javaClass, "flip"));
+    String disassembledMethod = method.getCode().toString();
+
+    final String JAVA8_API_CALL = "invokevirtual\tjava.nio.ByteBuffer.flip ()Ljava/nio/Buffer;";
+    final String JAVA9_API_CALL = "invokevirtual\tjava.nio.ByteBuffer.flip ()Ljava/nio/ByteBuffer;";
+    if (disassembledMethod.contains(JAVA9_API_CALL))
+      fail(
+        "Class '" + className + "' was compiled against Java 9+ API. " +
+        "There seems to be a problem with the '--release' compiler option.\n" +
+        "Disassembled method:\n" + disassembledMethod
+      );
+    else if (!disassembledMethod.contains(JAVA8_API_CALL))
+      fail(
+        "Cannot determine if class '" + className + "' was compiled against Java 8 or 9+ API. " +
+        "This should never happen.\n" +
+        "Disassembled method:\n" + disassembledMethod
+      );
+  }
+
+  public static Test suite() {
+    return XMLBasedAjcTestCase.loadSuite(CompileWithReleaseTests.class);
+  }
+
+  @Override
+  protected java.net.URL getSpecFile() {
+    return getClassResource("ajc198.xml");
+  }
+
+}

tests/src/test/java/org/aspectj/systemtest/ajc198/Java17PreviewFeaturesTests.java

@@ -0,0 +1,47 @@
+/*******************************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ *******************************************************************************/
+package org.aspectj.systemtest.ajc198;
+
+import junit.framework.Test;
+import org.aspectj.apache.bcel.Constants;
+import org.aspectj.testing.XMLBasedAjcTestCase;
+import org.aspectj.testing.XMLBasedAjcTestCaseForJava17Only;
+
+/**
+ * @author Alexander Kriegisch
+ */
+public class Java17PreviewFeaturesTests extends XMLBasedAjcTestCaseForJava17Only {
+
+/*
+  public void testSealedClassWithLegalSubclasses() {
+    runTest("sealed class with legal subclasses");
+    checkVersion("Employee", Constants.MAJOR_16, Constants.PREVIEW_MINOR_VERSION);
+    checkVersion("Manager", Constants.MAJOR_16, Constants.PREVIEW_MINOR_VERSION);
+  }
+
+  public void testSealedClassWithIllegalSubclass() {
+    runTest("sealed class with illegal subclass");
+    checkVersion("Person", Constants.MAJOR_16, Constants.PREVIEW_MINOR_VERSION);
+  }
+
+  public void testWeaveSealedClass() {
+    runTest("weave sealed class");
+    checkVersion("PersonAspect", Constants.MAJOR_16, Constants.PREVIEW_MINOR_VERSION);
+  }
+*/
+
+  public static Test suite() {
+    return XMLBasedAjcTestCase.loadSuite(Java17PreviewFeaturesTests.class);
+  }
+
+  @Override
+  protected java.net.URL getSpecFile() {
+    return getClassResource("ajc198.xml");
+  }
+
+}

tests/src/test/java/org/aspectj/systemtest/ajc198/SanityTestsJava17.java

@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * Copyright (c) 2021 Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
+ *******************************************************************************/
+package org.aspectj.systemtest.ajc198;
+
+import junit.framework.Test;
+import org.aspectj.testing.XMLBasedAjcTestCase;
+import org.aspectj.testing.XMLBasedAjcTestCaseForJava17OrLater;
+
+/*
+ * Some very trivial tests that help verify things are OK.
+ * These are a copy of the earlier Sanity Tests created for 1.6 but these supply the -10 option
+ * to check code generation and modification with that version specified.
+ *
+ * @author Alexander Kriegisch
+ */
+public class SanityTestsJava17 extends XMLBasedAjcTestCaseForJava17OrLater {
+
+	public static final int bytecode_version_for_JDK_level = 61;
+
+	// Incredibly trivial test programs that check the compiler works at all (these are easy-ish to debug)
+	public void testSimpleJava_A() {
+		runTest("simple - a");
+	}
+
+	public void testSimpleJava_B() {
+		runTest("simple - b");
+	}
+
+	public void testSimpleCode_C() {
+		runTest("simple - c");
+	}
+
+	public void testSimpleCode_D() {
+		runTest("simple - d");
+	}
+
+	public void testSimpleCode_E() {
+		runTest("simple - e");
+	}
+
+	public void testSimpleCode_F() {
+		runTest("simple - f");
+	}
+
+	public void testSimpleCode_G() {
+		runTest("simple - g");
+	}
+
+	public void testSimpleCode_H() {
+		runTest("simple - h", true);
+	}
+
+	public void testSimpleCode_I() {
+		runTest("simple - i");
+	}
+
+	public void testVersionCorrect1() {
+		runTest("simple - j");
+		checkVersion("A", bytecode_version_for_JDK_level, 0);
+	}
+
+	public void testVersionCorrect2() {
+		runTest("simple - k");
+		checkVersion("A", bytecode_version_for_JDK_level, 0);
+	}
+
+	public void testVersionCorrect4() {
+		runTest("simple - m");
+		// Must be 49.0 when -1.5 is specified
+		checkVersion("A", 49, 0);
+	}
+
+	public static Test suite() {
+		return XMLBasedAjcTestCase.loadSuite(SanityTestsJava17.class);
+	}
+
+	@Override
+	protected java.net.URL getSpecFile() {
+		return getClassResource("sanity-tests-17.xml");
+	}
+
+}

tests/src/test/resources/org/aspectj/systemtest/ajc198/ajc198.xml

@@ -0,0 +1,40 @@
+<!DOCTYPE suite SYSTEM "../tests/ajcTestSuite.dtd"[]>
+
+
+<suite>
+
+	<!-- Java ?? final, Java 16, 15 preview -->
+<!--
+	<ajc-test dir="features197/java15" vm="17" title="sealed class with legal subclasses">
+		<compile files="Person.java Employee.java Manager.java" options="&#45;&#45;enable-preview -16" />
+	</ajc-test>
+-->
+
+	<!-- Java ?? final, Java 16, 15 preview -->
+<!--
+	<ajc-test dir="features197/java15" vm="17" title="sealed class with illegal subclass">
+		<compile files="Person.java  Employee.java Manager.java PersonaNonGrata.java" options="&#45;&#45;enable-preview -16">
+			<message kind="error" file="PersonaNonGrata.java" text="should be a permitted subtype of Person"/>
+		</compile>
+	</ajc-test>
+-->
+
+	<!-- Java ?? final, Java 16, 15 preview -->
+<!--
+	<ajc-test dir="features197/java15" vm="17" title="weave sealed class">
+		<compile files="Person.java Employee.java Manager.java TopManager.java PersonAspect.aj" options="&#45;&#45;enable-preview -16" />
+		<run class="TopManager" vmargs="&#45;&#45;enable-preview">
+			<stdout>
+				<line text="Hello Sir John" />
+				<line text="CEO" />
+			</stdout>
+		</run>
+	</ajc-test>
+-->
+
+	<!-- Javac/ECJ 9+ compiler option, but belated implementation in AJC 1.9.7 -->
+	<ajc-test dir="features198/compiler_release" vm="9" title="compile to older JDK release">
+		<compile files="Buffers.java" options="--release 8"/>
+	</ajc-test>
+
+</suite>

tests/src/test/resources/org/aspectj/systemtest/ajc198/sanity-tests-17.xml

@@ -0,0 +1,70 @@
+<!DOCTYPE suite SYSTEM "../tests/ajcTestSuite.dtd"[]>
+
+<suite>
+
+    <!-- empty class -->
+    <ajc-test dir="bugs160/simplejava" title="simple - a">
+      <compile files="SimpleA.java" options="-17"/>
+    </ajc-test>
+
+    <!-- class with one method -->
+    <ajc-test dir="bugs160/simplejava" title="simple - b">
+      <compile files="SimpleB.java" options="-17"/>
+      <run class="SimpleB"/>
+    </ajc-test>
+
+    <!-- empty aspect -->
+    <ajc-test dir="bugs160/simplejava" title="simple - c">
+      <compile files="SimpleC.java" options="-17"/>
+    </ajc-test>
+
+    <!-- simple before -->
+    <ajc-test dir="bugs160/simplejava" title="simple - d">
+      <compile files="SimpleD.java" options="-17"/>
+    </ajc-test>
+
+    <!-- simple itd field -->
+    <ajc-test dir="bugs160/simplejava" title="simple - e">
+      <compile files="SimpleE.java" options="-17"/>
+    </ajc-test>
+
+    <!-- aspect with main calling a static method -->
+    <ajc-test dir="bugs160/simplejava" title="simple - f">
+      <compile files="SimpleF.java" options="-17"/>
+    </ajc-test>
+
+    <!-- pertarget -->
+    <ajc-test dir="bugs160/simplejava" title="simple - g">
+      <compile files="SimpleG.java" options="-17"/>
+    </ajc-test>
+
+    <!-- generic ctor itds -->
+    <ajc-test dir="bugs160/simplejava" title="simple - h">
+      <compile files="SimpleH.java" options="-17"/>
+    </ajc-test>
+
+    <!-- overriding generic itd methods -->
+    <ajc-test dir="bugs160/simplejava" title="simple - i">
+      <compile files="SimpleI.java" options="-17"/>
+    </ajc-test>
+
+    <!-- check class file version is 60.0 (Java 16) -->
+    <ajc-test dir="bugs160/simplejava" title="simple - j">
+      <compile files="SimpleJ.java" options="-17"/>
+    </ajc-test>
+
+    <!-- check class file version is 60.0 (Java 16) -->
+    <ajc-test dir="bugs160/simplejava" title="simple - k">
+      <compile files="SimpleJ.java" options="-source 16"/>
+    </ajc-test>
+
+    <!-- check class file version is 49.0 -->
+    <ajc-test dir="bugs160/simplejava" title="simple - m">
+      <compile files="SimpleJ.java" options="-1.5"/>
+    </ajc-test>
+
+    <ajc-test dir="bugs160/simplejava" title="simple - n">
+      <compile files="SimpleN.java" options="-17"/>
+    </ajc-test>
+
+</suite>

util/src/main/java/org/aspectj/util/LangUtil.java

@@ -190,6 +190,10 @@ public class LangUtil {
 		return 17 <= vmVersion;
 	}
 
+	public static boolean is18VMOrGreater() {
+		return 18 <= vmVersion;
+	}
+
 	/**
 	 * Shorthand for "if null, throw IllegalArgumentException"
 	 *