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

[Shigeru Chiba (JIRA)]

     [ https://issues.jboss.org/browse/JASSIST-175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shigeru Chiba resolved JASSIST-175.
-----------------------------------

    Fix Version/s: 3.17.0-GA
       Resolution: Done


This is not a bug but I modified Javassist to throw an informative exception.
                
> 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!

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