Re: Class load order

Le 12/01/2010 18:32, Peter Veentjer a écrit :
>
> Hi guys,
>
> I'm struggling with an issue that is caused by the order of loading 
> classes.
>
> I add additional methods to classes and this works great. If enhanced 
> class A is loaded before enhanced class B, B is allowed to call these 
> extra methods of A. But if class B is loaded before class A is 
> loaded,  i get à verify error that i'm calling a non existing method 
> on A.
>
> If i manually force loading A before B everything is allright.
>
> I would like to learn an approach to deal with this problem so that 
> the instrumentation process gets more predictable.
>
> More info about the transformation. I'm building an stm and i add 
> transactions to classes. This is done by creating an extra method with 
> an extra argument of type transaction. All the original Logic is moved 
> to this method. The code in the original method is replaced by 
> transaction management code that forwards the call inclusive the 
> transaction to the added method.
>
> The optimization i want to add is that if transactional methods are 
> called from the original code, that the method calls are replaced by 
> the version that acceps à transaction. There is no need to go through 
> the transaction management and access à threadlocal to get the 
> transaction.
>

You can also retransform (or redefine) a class :
http://download.java.net/jdk7/docs/api/java/lang/instrument/Instrumentation.html#retransformClasses%28java.lang.Class...%29

Rémi

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