I am making an Object tree - to - SAX event stream converter to use as a view in my mvc framework, and stumbled into two problems.

First one.

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java.lang.IllegalAccessException: Class com.promtech.commons.o2x.O2XWriter can not access a member of class com.promtech.commons.o2x.com_promtech_tryouts_TestO2X_TestOne__handler with modifiers "public"
at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:57)
at java.lang.Class.newInstance0(Class.java:300)
at java.lang.Class.newInstance(Class.java:259)
at com.promtech.commons.o2x.O2XWriter.createHandler(O2XWriter.java:140)
at com.promtech.commons.o2x.O2XWriter.getRegisteredHandler(O2XWriter.java:121)
at com.promtech.commons.o2x.O2XWriter.parseClass(O2XWriter.java:96)
at com.promtech.tryouts.TestO2X.main(TestO2X.java:18)
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Exception pops when i create a new class with Javassist, load it with Loader object and call
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hnd = handlerClass.newInstance();
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As a workaround i can use:
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Constructor cnt = handlerClass.getConstructors()[0];
cnt.setAccessible(true);
hnd = cnt.newInstance(new Object[] {});
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But that is still ugly way..

Second one.

I have an abstract class, which i copy to a new class, implement abstract methods and set new classes superclass to the original abstract class:
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newClass = pool.getAndRename(baseClassName, newClassName);
handlerBase = pool.get(baseClassName);
newClass.setSuperclass(handlerBase);
.....
initializer = pool.getMethod(newClassName, "initialize");
writeInstance = pool.getMethod(newClassName, "writeInstance");

initializer.setBody(initializerBody);
writeInstance.setBody(methodBody);

newClass.setModifiers(Modifier.PUBLIC & Modifier.FINAL);
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i then use workaround mentioned in the first section
and create an instance of my new class, then i try to cast it to a superclass so i can use overriden method:

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handler = (ClassHandler) hnd;
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that line of code fails with ClassCastException

if you need more of my code to answer my question, i can surely post it here