IllegalArgumentException: object is not an instance of declaring class

Question

How is it possible that the "foo" exception is not thrown, but a subsequent call of invoke() throws the below exception?

if (method.getDeclaringClass() != object.getClass())
    throw new RuntimeException("foo");

method.invoke(object);

Thrown exception:

java.lang.IllegalArgumentException: object is not an instance of declaring class at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Can you give move details, for example the class definition? — iny
– iny, Commented Apr 19, 2009 at 8:30

Jaka Jančar · Accepted Answer · 2009-04-19 09:13:01Z

13

Beh... The method.invoke() call wasn't the one throwing directly. The target method was using invoke too and it threw, so it bubbled up.

Lesson learned: Handle InvocationTargetException separately from other exceptions.

answered Apr 19, 2009 at 9:07

Jaka Jančar

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1 Comment

So: always look at the full stack trace.