JDK-8066497 : Update c.o.j.t.ByteCodeLoader to be able really reload given class
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-12-02
  • Updated: 2015-06-03
  • Resolved: 2014-12-27
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JDK 9
9 b47Fixed
Related Reports
Blocks :  
JDK-8059551 - JEP-JDK-8043304: Test task: stress tests
Description
Problem: we need to redefine class w/ given name from existing byte code. loadClass first tries to load class using parent or bootstrap classloader and doesn't really reload class as new.
Solution: override loadClass to break delegation for given className.
Comments
If the class is restricted to the user-defined ByteCodeLoader then there is no need to break delegation as the parent loaders should not be able to find it. If the parent loaders can find it then there seems to be a problem with the way things are being set up.
09-12-2014
I meant load class from bytecode using new instance of ByteCodeLoader, of course. Sorry for inaccurate description.
08-12-2014
You can't reload a class that is already loaded - even if you override loadClass to attempt it, the defineClass will fail. To reload a class you need to use a different classloader for each of the variants loaded, and they must be siblings not ancestors/descendents.
04-12-2014