JDK-8210510 : JCMD's dependency on hardcoded Constant Pool indexes should be eliminated
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 12
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • Submitted: 2018-09-07
  • Updated: 2022-01-04
  • Resolved: 2022-01-04
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tbdResolved
Related Reports
Duplicate :  
JDK-8272065 - jcmd cannot rely on the old core reflection implementation which will be changed after JEP 416
Relates :  
JDK-8203343 - VM.{metaspace|classloaders|classhierarchy...} jcmd should show invocation targets for Generated{Method|Constructor}AccessorImpl classes
Relates :  
JDK-8272065 - jcmd cannot rely on the old core reflection implementation which will be changed after JEP 416
Relates :  
JDK-8209899 - [lworld] dcmd tests crash with "Unexpected constant pool layout"
Description
Hotspot file reflectionAccessorImplKlassHelper.cpp, used by jcmd to inspect  reflection generated classes, uses hard-coded constant pool indices to find information in these classes. For example, for reflection generated classes that are not SerializationConstructorAccessors, it expects the method name and signature to be in constant pool indexes 7 and 8. 

This dependency on hard-coded constant pool indices is fragile and can easily be broken.  The implementation of reflectionAccessorImplKlassHelper.cpp should be changed to something less fragile.
Comments
JDK-8272065 will remove this code and thus take care of this issue too.
04-11-2021
This is for 'jcmd' so I would expect this bug to land in core-svc/tools instead of hotspot/runtime.
11-09-2018