jodd-proxetta/src/main/java/jodd/proxetta/advice/DelegateAdviceUtil.java
public static void injectTargetIntoProxy(final Object proxy, final Object target) {
		Class proxyClass = proxy.getClass();

		try {
			Field field = proxyClass.getField("$___target$0");

			field.set(proxy, target);
		} catch (Exception ex) {
			throw new ProxettaException(ex);
		}
	}
public static void injectTargetIntoProxy(final Object proxy, final Object target) {
		Class proxyClass = proxy.getClass();

		try {
			Field field = proxyClass.getField("$___target$0");

			field.set(proxy, target);
		} catch (Exception ex) {
			throw new ProxettaException(ex);
		}
	}
Injects target into proxy.