[jboss-jira] [JBoss JIRA] (JASSIST-175) NPE while replacing FieldAccess with an instruction

NPE while replacing FieldAccess with an instruction --------------------------------------------------- Key: JASSIST-175 URL: https://issues.jboss.org/browse/JASSIST-175 Project: Javassist Issue Type: Bug Reporter: Celestino Bellone Assignee: Shigeru Chiba Fix For: 3.17.0-GA Attachments: testNPE.tar.gz Hi guys, I built an application that plays with load-time instrumentation. It worked well until I tested it on java7. I had the same problem of PowerMock people (class VerifyError) so I switched to 3.17 snapshot; then I got the followin error while replacing a field access: {noformat} java.lang.NullPointerException at javassist.bytecode.stackmap.MapMaker.fixTypes(MapMaker.java:285) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:140) at javassist.bytecode.stackmap.MapMaker.make(MapMaker.java:99) at javassist.bytecode.MethodInfo.rebuildStackMap(MethodInfo.java:423) at javassist.bytecode.MethodInfo.rebuildStackMapIf6(MethodInfo.java:405) at javassist.expr.ExprEditor.doit(ExprEditor.java:113) at javassist.CtClassType.instrument(CtClassType.java:1398) at com.ejisto.core.classloading.ClassTransformer.transform(ClassTransformer.java:182) at com.ejisto.core.classloading.ClassTransformer.transform(ClassTransformer.java:137) at sun.instrument.TransformerManager.transform(TransformerManager.java:188) at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:424) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:791) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2901) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1170) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556) at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1209) [cut] {noformat} I found this issue running my application with javassist 3.17 on both java7 and java6. here attached you can find the code that reproduces this error. Many thanks for your help!