Re: subclass and superclass transformation question

I'm currently not using the java agent, but I like to do son in
future.

My problem concerning the order of class loading is, that I need
at least to analyse parent classes and interfaces before trans-
forming the subclasses.

But how can I do this without forcing the class loader to load
interfaces and parent classes. Any suggestion?

CU Tronje

Eugene Kuleshov wrote:
>   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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