Java Reflection API in Liferay

I am currently experimenting with the Java Reflection API in combination with Liferay and the Dynamic Query API. I want to see if I can build some more generic accessor classes for the Dynamic Query API. So I started today and I came across this Exception:

Exception in thread "main" java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)

This happens, when you (like me) try to invoke a method without providing an actual instance of the class the method should be invoked on. So don´t use

Method method = instanze.getClass().getMethod("getTest", (Class[]) null);
Object[] myArray = new T1[0];

Use instead


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If you have any questions, feel free to leave a comment.