CODEWITHSUNDEEP
javareflection
One Two Three
One Two Three

Reputation: 23537

Retrieve the *real* exception thrown from a method reflectively invoked

Say I have a method foo() declared below.

public class Foo
{
    public static void foo() {throw new UnsupportedOperationException();}
}

Then I have code that invoked the method using reflection:

Foo.class.getMethod("foo").invoke();

This would throw InvocationTargetException rather than the UnsupportedOperationException that is actually thrown in the method.

How do I retrieve the real exception (ie., the UnsupportedOperationException) with Java's reflection?

Upvotes: 3

Views: 112

Answers (3)

Satheesh Cheveri
Satheesh Cheveri

Reputation: 3679

try{
  // do your invoke
}

catch ( InvocationTargetException e)
{
     try
     {
           throw e.getCause ( ) ;
     }
     catch ( IllegalArgumentException e )
     {
           // method exception
     }
     catch ( NullPointerException e )
     {
            //method exception
     }
}

http://docs.oracle.com/javase/tutorial/reflect/member/methodInvocation.html

Upvotes: 0

Ruchira Gayan Ranaweera
Ruchira Gayan Ranaweera

Reputation: 35587

You are getting that InvocationTargetException due to refection invocation. Handle that Exception too.

Upvotes: 0

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 280174

The javadoc for InvocationTargetException states

InvocationTargetException is a checked exception that wraps an exception thrown by an invoked method or constructor.

Just call InvocationTargetException#getCause() to get the wrapped exception (or getTargetException() if you want to be old-school).

Upvotes: 6

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