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While working on a project in Grails 2.1.0 (on Windows 7 64-bit) I ran into an interesting error.
Aug 29, 2012 7:17:21 PM com.springsource.loaded.agent.SpringLoadedPreProcessor preProcess
SEVERE: Unexpected problem transforming call sites
java.lang.IllegalStateException: Unexpected problem processing bytes for class
at com.springsource.loaded.ConstantPoolChecker2.readConstantPool(ConstantPoolChecker2.java:182)
at com.springsource.loaded.ConstantPoolChecker2.(ConstantPoolChecker2.java:114)
at com.springsource.loaded.ConstantPoolChecker2.getReferences(ConstantPoolChecker2.java:88)
at com.springsource.loaded.MethodInvokerRewriter.rewrite(MethodInvokerRewriter.java:248)
at com.springsource.loaded.MethodInvokerRewriter.rewriteUsingCache(MethodInvokerRewriter.java:141)
at com.springsource.loaded.TypeRegistry.methodCallRewriteUseCacheIfAvailable(TypeRegistry.java:775)
at com.springsource.loaded.agent.SpringLoadedPreProcessor.preProcess(SpringLoadedPreProcessor.java:251)
at com.springsource.loaded.agent.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:89)
at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:424)
at java.lang.ClassLoader.defineClass1(Native Method)...I had done some searching and apparently a similar error had been addressed previously. The part about Unexpected problem transforming call sites was the same, but the actual exception, java.lang.IllegalStateException differed. I’m not sure what the actual fix is, but I went to {home folder}/AppData and deleted the .grails folder. This seemed to address the problem. Hope this helps anybody who might run into the same problem.