[Springframework-developer] A question about Spring AOP - Does it support the arg constructor?

[Wenke J. <ji...@gm...>]

Hi,
In the usage of the AOP , we found that with the proxy class usign CGLIB
with contructor arg - a exception throw with
"org.springframework.aop.framework.AopConfigException". Checking the source
code and the testcases(Version 2.5.6) and found that Spring actually doesn't
support it. Is that means Spring not encourage this use cases or it is a
missing functionality? - it sounds tricky, can any one help to clarify it ?
Thanks your time so much!

Tracing code in the Cglib2AopProxy line197:
            if (this.constructorArgs != null) {
                proxy = enhancer.create(this.constructorArgTypes,
this.constructorArgs);
            }
            else {
                proxy = enhancer.create();
            }
it is the exception occurred.
And by trace the use of the Cglib2AopProxy.setConstructorArguments - It is
only called in the testcases instead of production code. Does it means when
use don't permit to AOP those class with arg constructor directly?


       public void testWithNoArgConstructor() {

   1.     NoArgCtorTestBean target = new NoArgCtorTestBean("b", 1);
   2.     target.reset();
   3.
   4.     mockTargetSource.setTarget(target);
   5.     AdvisedSupport pc = new AdvisedSupport(new Class[]{});
   6.     pc.setTargetSource(mockTargetSource);
   7.     Cglib2AopProxy aop = new Cglib2AopProxy(pc);
   8.         aop.setConstructorArguments(new Object[] {"Rob Harrop", new
    Integer(22)},
   9.             new Class[] {String.class, int.class});
   10.     NoArgCtorTestBean proxy = (NoArgCtorTestBean) aop.getProxy();
   11.     proxy = (NoArgCtorTestBean) aop.getProxy();
   12.
   13.     assertNotNull("Proxy should be null", proxy);
   14. }