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