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Build Identifier: 201205071000 I'm using Spring Roo 1.2.1. java.lang.NullPointerException at org.aspectj.ajdt.internal.core.builder.AsmElementFormatter.genLabelAndKind(AsmElementFormatter.java:205) at org.aspectj.ajdt.internal.core.builder.AsmHierarchyBuilder.visit(AsmHierarchyBuilder.java:529) at org.aspectj.org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:270) at org.aspectj.org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1 ... ction$1.run(GlobalBuildAction.java:180) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Compile error: NullPointerException thrown: null Reproducible: Always Steps to Reproduce: There are a lot of moving parts and so this situation is likely not easy to reproduce on other machines; the environment is complex. 1. Delete and put back a squiggly bracket which starts the class definition. 2. Save (with auto-build turned off). 3. Command-B to build.