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Default Signature This signature, for around advices only, demands a java.lang.Object return type. Notice that this signature is valid for any joipoint, no matter whether it has a return value, and, if it does, whether this value is primitive or not (a wrapper object is expected if the joinpoint returns a primitive value). An example of this signature is Aspect.aroundDefaultSignature() advice: public Object aroundDefaultSignature(MethodInvocation invocation) throws Throwable Open up jboss-aop.xml and verify that this advice is applied to a method that returns a primitive value, a method that returns a non-primitive value, and a void method.