Accessing module internals from bytecode rewriting agent

Alan Bateman Alan.Bateman at
Tue Apr 25 06:35:50 UTC 2017

On 25/04/2017 07:22, Jeremy Manson wrote:

> :
> The instrument API specifically supports a Boot-Class-Path attribute in the
> MANIFEST, as well as Instrumentation.appendToBootStrapClassLoaderSearch.  I
> had been using that as a way to make it possible to rewrite JDK internals
> (add allocation instrumentation to them).
I wouldn't expect any issues with that scenario as the VM adds the 
readability needed for this to work. From the javadoc:

"As an aid to agents that deploy supporting classes on the search path 
of the bootstrap class loader, or the search path of the class loader 
that loads the main agent class, the Java virtual machine arranges for 
the module of transformed classes to read the unnamed module of both 
class loaders."

Instead, I think the issue in Martin's mail is more to do with Byteman 
moving to java.lang.invoke and running into an issue getting full power 
lookups to fully privileged classes.


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