NestMember requires ASM7 in Byte Buddy

[will.s...@gmail.com]

Hi all,

I'm instrumenting some java security classes so that I can output logging from them into Logback, and I'm running into a stack trace that I don't understand:

[Byte Buddy] ERROR sun.security.pkcs12.PKCS12KeyStore [null, module java.base, Thread[main,5,main], loaded=true]
java.lang.UnsupportedOperationException: NestMember requires ASM7
    at net.bytebuddy.jar.asm.ClassVisitor.visitNestMember(ClassVisitor.java:251)
    at net.bytebuddy.jar.asm.ClassVisitor.visitNestMember(ClassVisitor.java:254)
    at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining$WithFullProcessing$RedefinitionClassVisitor.onVisitNestMember(TypeWriter.java:5117)
    at net.bytebuddy.utility.visitor.MetadataAwareClassVisitor.visitNestMember(MetadataAwareClassVisitor.java:233)
    at net.bytebuddy.jar.asm.ClassReader.accept(ClassReader.java:673)
    at net.bytebuddy.jar.asm.ClassReader.accept(ClassReader.java:401)
    at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining.create(TypeWriter.java:3919)
    at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:2193)
    at net.bytebuddy.dynamic.scaffold.inline.RedefinitionDynamicTypeBuilder.make(RedefinitionDynamicTypeBuilder.java:224)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:10930)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10866)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1700(AgentBuilder.java:10584)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmDispatcher.run(AgentBuilder.java:11331)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$Java9CapableVmDispatcher.run(AgentBuilder.java:11270)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doPrivileged(AgentBuilder.java)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:10808)
    at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$ByteBuddy$ModuleSupport.transform(Unknown Source)

This happens even if I load up the latest ASM onto the classpath.  I haven't seen very many other instances of this error, so the usual "stackoverflow copy/paste" solution isn't working.

Here's a github project replicating the error (note you must have =debug on the agent to see the trace)

https://github.com/wsargent/jca-key-failure

And here's a most stripped down version of logging instrumentation to see how it should work:

https://github.com/tersesystems/logging-instrumentation-example

Any ideas?

Thanks,

Will.

[will.s...@gmail.com]

Or... maybe I'm defining my class visitor with ASM 5 opscodes and so that happens.

https://github.com/tersesystems/terse-logback/pull/128/files#diff-fa7ba720675fb6bf419064faa964e7bbe3c862445ddb98c10f635b2ee83211dcL77

[Rafael Winterhalter]

That's likely the problem. Is your issue solved doing this? 

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[Will Sargent]

Yes, that fixes the problem and now everything works.