Upgrade to Eclipse 2021-09

2021-09 requires Java 11 so the version of ASM has been upgraded to
one that supports Java 11 bytecode and EclipseRewriter has been
updated to use the matching ASM API version.

2021-09 also contains an updated version of the NLS class that we
rewrite to remove a call to System.getProperty. Previously, this
call was done in an isolated fashion in the run method of an
anonmyous inner-class. It's now been updated [1] to use a lamdba
which results in the call to System.getProperty now being part of
the class's static initializer. This commit rewrites this <clinit>
to retain the existing initialization of EMPTY_ARGS and ASSIGNED
fields while updating the initialization of ignoreWarnings to
replace the System.getProperty call with a hardcoded true value.

Closes gh-277

[1] https://git.eclipse.org/c/equinox/rt.equinox.framework.git/commit/bundles/org.eclipse.osgi/supplement/src/org/eclipse/osgi/util/NLS.java?id=ba6205dab1f857fe87cf5985f03c1b5e88797064

pom.xml

@@ -31,12 +31,12 @@
 		<main.basedir>${basedir}</main.basedir>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<java.version>1.8</java.version>
-		<eclipse.repository>https://download.eclipse.org/releases/2021-03/202103171000/</eclipse.repository>
+		<eclipse.repository>https://download.eclipse.org/releases/2021-09/202109151000/</eclipse.repository>
 		<eclipse.checkstyle.repository>https://checkstyle.org/eclipse-cs-update-site/</eclipse.checkstyle.repository>
 		<tycho.disableP2Mirrors>true</tycho.disableP2Mirrors>
 		<ant.version>1.8.1</ant.version>
 		<ant-contrib.version>1.0b3</ant-contrib.version>
-		<asm.version>5.2</asm.version>
+		<asm.version>7.3.1</asm.version>
 		<assertj.version>3.8.0</assertj.version>
 		<checkstyle.version>8.45.1</checkstyle.version>
 		<gradle.version>3.4</gradle.version>

spring-javaformat/spring-javaformat-formatter-eclipse-rewriter/src/main/java/io/spring/javaformat/formatter/eclipse/rewrite/EclipseRewriter.java

@@ -42,6 +42,7 @@
  * Internal build utility used to rewrite eclipse runtime classes.
  *
  * @author Phillip Webb
+ * @author Andy Wilkinson
  */
 public final class EclipseRewriter {
 
@@ -75,7 +76,7 @@ public void rewrite(String file) throws IOException {
 	private void rewrite(FileSystem zip) throws IOException {
 		rewrite(zip, "org/eclipse/jdt/internal/formatter/DefaultCodeFormatter.class",
 				DefaultCodeFormatterManipulator::new);
-		rewrite(zip, "org/eclipse/osgi/util/NLS$1.class", NlsManipulator::new);
+		rewrite(zip, "org/eclipse/osgi/util/NLS.class", NlsManipulator::new);
 	}
 
 	private void rewrite(FileSystem zip, String name, Function<ClassWriter, ClassVisitor> manipulator)
@@ -100,7 +101,7 @@ public static void main(String[] args) throws Exception {
 	private static class DefaultCodeFormatterManipulator extends ClassVisitor {
 
 		DefaultCodeFormatterManipulator(ClassVisitor visitor) {
-			super(Opcodes.ASM5, visitor);
+			super(Opcodes.ASM7, visitor);
 		}
 
 		@Override
@@ -129,7 +130,7 @@ public MethodVisitor visitMethod(int access, String name, String desc, String si
 	private static class DefaultCodeFormatterMethodManipulator extends MethodVisitor {
 
 		DefaultCodeFormatterMethodManipulator(MethodVisitor mv) {
-			super(Opcodes.ASM5, mv);
+			super(Opcodes.ASM7, mv);
 		}
 
 		@Override
@@ -149,12 +150,12 @@ public void visitMethodInsn(int opcode, String owner, String name, String desc,
 	private static class NlsManipulator extends ClassVisitor {
 
 		NlsManipulator(ClassVisitor visitor) {
-			super(Opcodes.ASM5, visitor);
+			super(Opcodes.ASM7, visitor);
 		}
 
 		@Override
 		public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
-			if ("run".equals(name) && desc.contains("Boolean")) {
+			if ("<clinit>".equals(name)) {
 				return new NslMethodManipulator(super.visitMethod(access, name, desc, signature, exceptions));
 			}
 			return super.visitMethod(access, name, desc, signature, exceptions);
@@ -171,17 +172,26 @@ private static class NslMethodManipulator extends MethodVisitor {
 		private final MethodVisitor methodVisitor;
 
 		NslMethodManipulator(MethodVisitor mv) {
-			super(Opcodes.ASM5, null);
+			super(Opcodes.ASM7, null);
 			this.methodVisitor = mv;
 		}
 
 		@Override
 		public void visitEnd() {
 			MethodVisitor mv = this.methodVisitor;
 			mv.visitCode();
+			mv.visitInsn(Opcodes.ICONST_0);
+			mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
+			mv.visitFieldInsn(Opcodes.PUTSTATIC, "org/eclipse/osgi/util/NLS", "EMPTY_ARGS", "[Ljava/lang/Object;");
 			mv.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/Boolean", "TRUE", "Ljava/lang/Boolean;");
-			mv.visitInsn(Opcodes.ARETURN);
-			mv.visitMaxs(1, 1);
+			mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
+			mv.visitFieldInsn(Opcodes.PUTSTATIC, "org/eclipse/osgi/util/NLS", "ignoreWarnings", "Z");
+			mv.visitTypeInsn(Opcodes.NEW, "java/lang/Object");
+			mv.visitInsn(Opcodes.DUP);
+			mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
+			mv.visitFieldInsn(Opcodes.PUTSTATIC, "org/eclipse/osgi/util/NLS", "ASSIGNED", "Ljava/lang/Object;");
+			mv.visitInsn(Opcodes.RETURN);
+			mv.visitMaxs(2, 0);
 			mv.visitEnd();
 		}