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Re: Create Dynamic Proxy for class instead of interface

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On Sun, 12 Jun 2011, Stanimir Stamenkov wrote:

> The Dynamic Proxy API [1] allows one to create proxy classes 
> implementing number of specified interfaces.  I've wondered if it is 
> possible and how to create such a proxy class for a specified class and 
> not interface.  I've found Javassit should provide such means, but 
> haven't really tried it yet:
>
> http://en.wikipedia.org/wiki/Javassist
>
> I basically want to create a proxy augmenting an existing object with 
> additional interface.  Is the Javassist library the right tool for doing 
> this?  Are there other similar tools?

A number - i wrote a little list at one point:

http://urchin.earth.li/~twic/Java_Bytecode_Libraries.html

Having said that, while all of these can be used to do the bytecode 
editing you would need to construct such a proxy, i don't know if all of 
them include ready-made tools to do it. Probably not.

Something else you probably want to know about is the instrumentation API:

http://download.oracle.com/javase/6/docs/api/java/lang/instrument/package-summary.html

Essentially, you can use this to get all classes loaded by the JVM to go 
through some of your code to be modified before loading. That lets you 
actually rewrite existing classes as they load - no need for proxies, you 
can change the actual classes. This is commonly used by things like JPA 
and AOP implementations.

tom

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Create Dynamic Proxy for class instead of interface Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-12 17:15 +0300
  Re: Create Dynamic Proxy for class instead of interface Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-12 17:40 +0300
    Re: Create Dynamic Proxy for class instead of interface Robert Klemme <shortcutter@googlemail.com> - 2011-06-12 19:07 +0200
      Re: Create Dynamic Proxy for class instead of interface Stanimir Stamenkov <s7an10@netscape.net> - 2011-06-12 20:42 +0300
  Re: Create Dynamic Proxy for class instead of interface Tom Anderson <twic@urchin.earth.li> - 2011-06-13 11:58 +0100

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