Re: Re: subclass and superclass transformation question

  I wouldn't advise loading classes from the agent. Instead you should
be able to prepare required transformations "virtually" when
analyzing/loading subclasses, save some state and do the actual
transformation when parent is actually loaded by JVM.

  regards,
  Eugene


On Tue, Feb 23, 2010 at 10:01 AM, Rémi Forax <[email protected]> wrote:
> Hi Peter,
>
> Le 23/02/2010 14:49, Peter Veentjer a écrit :
>>
>> I have a question about the details of superclass/subclass
>> transformations using a Java agent.
>>
>> If there is a class Fruit and a subclass Apple, and if a new Apple is
>> created before the Fruit class is used in the JVM.
>> What is the exact order of classes loaded in the Java agent?
>>
>> My experience is that the Apple class is transformed before the Fruit
>> class is transformed. Is this correct?
>>
>
> Yes, the VM read the transformed class, find the super class and load it,
> so superclass are loaded after class if there aren't loaded before.
>
> But you can load the superclass in the agent :)
> you have the classloader and you can find the superclass in the classfile.
> Just be careful about synchronisation, jdk7 classloading is done in
> parallele.
>
>
>> And is there any way to force to load the super class (Fruit) is
>> transformed before the subclass Apple is transformed?
>>
>> I have the impression that the Java agent technology is very limited
>> and that the only way to solve these issues is
>> to do a static transformation. The big problem is that it makes the
>> system much harder to work with from an IDE; normally
>> you only need to register some javaagent and you are done. But adding
>> a postcompilation step is much harder.
>>
>
> Rémi
>
>
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