关于java.lang.reflect.InvocationTargetException

try { 
            Class<?> c= Class.forName("com.csdhsm.chat.server.handler." + handlerName); 
            Class<?>[] arg=new Class[]{SocketRequest.class,SocketResponse.class}; 
            Method method=c.getMethod(action,arg);
            Logger.getLogger(Logger.class).info("实例化处理器" + handlerName);
            method.invoke(c.newInstance(), new Object[]{request,response}); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 

try {
            Method method = obj.getClass().getMethod(methodName);
            method.invoke(obj);
        } catch(NoSuchMethodException e) {
            throw new RequestNotFoundException(
                    "无法找到方法：" + methodName, e);
        } catch(InvocationTargetException e) {
            Throwable t = e.getCause();
            t.printStackTrace();
            throw new ObjectFactoryException(t);
        } catch(Exception e) {
            e.printStackTrace();
            throw new ObjectFactoryException(e);
        }