Upgrade to ASM7

Closes gh-299

pom.xml

@@ -36,7 +36,7 @@
 		<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

@@ -100,7 +100,7 @@ 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 +129,7 @@ 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
@@ -143,13 +143,13 @@ public void visitMethodInsn(int opcode, String owner, String name, String desc,
 	}
 
 	/**
-	 * {@link ClassVisitor} to update the {@code NLS} class so it doesn't use a System
-	 * property to disable warning messages.
+	 * {@link ClassVisitor} to update the {@code NLS} class so it doesn't use a
+	 * System property to disable warning messages.
 	 */
 	private static class NlsManipulator extends ClassVisitor {
 
 		NlsManipulator(ClassVisitor visitor) {
-			super(Opcodes.ASM5, visitor);
+			super(Opcodes.ASM7, visitor);
 		}
 
 		@Override
@@ -163,15 +163,15 @@ public MethodVisitor visitMethod(int access, String name, String desc, String si
 	}
 
 	/**
-	 * {@link MethodVisitor} to update the {@code NLS} class so it doesn't use a System
-	 * property to disable warning messages.
+	 * {@link MethodVisitor} to update the {@code NLS} class so it doesn't use a
+	 * System property to disable warning messages.
 	 */
 	private static class NslMethodManipulator extends MethodVisitor {
 
 		private final MethodVisitor methodVisitor;
 
 		NslMethodManipulator(MethodVisitor mv) {
-			super(Opcodes.ASM5, null);
+			super(Opcodes.ASM7, null);
 			this.methodVisitor = mv;
 		}