Re: java.lang.ClassNotFoundException during CheckClassAdapter.verify

25/08/2011 10:54, Nikita Salnikov-Tarnovski wrote:
> Hi.
> 
> I am implementing some java agent, which must instrument classes when 
> they are being loaded by JVM. In order to verify my instrumentation I 
> use CheckClassAdapter.verify. But sometimes I get the 
> java.lang.ClassNotFoundException:

> I think that the problem arises when class being instrumented right now 
> uses some other class, which is not loaded yet. And so ASM cannot verify it.
> 
> Is this possible to verify bytecode correctness without all classes 
> being loaded and available?

this is possible, but for that you need to write a subclass of SimpleVerifier, and to override its protected methods. By default these methods perform their work by loading the necessary classes with Class.forName(). Instead, you can implement them by loading only their bytecode (with ClassLoader.getResourceAsStream), and then using ClassReader.getAccess(), getSuperName(), and getInterfaces() to analyze it.

Eric

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