PermGen leak

[feng l.liu]

Hello Experts,

I am building up a test tool with ant, but I encountered so many 
DelegatingClassLoaders that put pressures on PermGen. I know that 
DelegatingClassLoaders are caused by java reflection.

Google search show some posts indicating generation of 
DelegatingClassLoader will be depressed if 
sun.reflect.inflationThreshold to zero , I tried it and found that this 
idea did not work at all. I dived into the code and found the snippets 
as below:

It looks that the DelegatingClassLoader will go away if I set 
sun.reflect.noInflation = true and sun.reflect.inflationThreshold to 
Integer.MAX_VALUE.  I tried it again but this idea did not work as well.

can you please give me some advices on this leak?

thank you in advance

ReflectionFactory.java

                     String val = 
System.getProperty("sun.reflect.noInflation");
                     if (val != null && val.equals("true")) {
                         noInflation = true;
                     }

                     val = 
System.getProperty("sun.reflect.inflationThreshold");
                     if (val != null) {
                         try {
                             inflationThreshold = Integer.parseInt(val);
                         } catch (NumberFormatException e) {
                             throw (RuntimeException)
                                 new RuntimeException("Unable to parse 
property sun.reflect.inflationThreshold").
                                     initCause(e);
                         }
                     }

                     initted = true;
                     return null;
                 }


NativeMethodAccessorImpl.java

     public Object invoke(Object obj, Object[] args)
         throws IllegalArgumentException, InvocationTargetException
     {
         if (++numInvocations > ReflectionFactory.inflationThreshold()) {
             MethodAccessorImpl acc = (MethodAccessorImpl)
                 new MethodAccessorGenerator().
                     generateMethod(method.getDeclaringClass(),
                                    method.getName(),
                                    method.getParameterTypes(),
                                    method.getReturnType(),
                                    method.getExceptionTypes(),
                                    method.getModifiers());
             parent.setDelegate(acc);
         }

         return invoke0(method, obj, args);
     }


Best regards