How to resolve java.lang.reflect.InvocationTargetException error
When a method of a class, invoked by Method.invoke(), throws an exception, it is wrapped by the java.lang.reflect.InvocationTargetException class.
Resolving the exception
Since the InvocationTargetException is caused by another exception thrown by the invoked method, the underlying exception can be found using the getCause() method. Therefore, resolving the InvocationTargetException error equates to finding the actual exception and resolving it.
Code
The code below intentionally generates an exception by dividing over in the method foo() which is invoked using Method.invoke(). As an output, the InvocationTargetException, as well as the underlying exception, is displayed on the console.
import java.lang.reflect.Method;public class ExceptionDemo {public static void main(String[] args) {TargetInvocation ti = new TargetInvocation();// Get all methods of TargetInvocationClass:Method[] m = TargetInvocation.class.getMethods();try {// Invoke the first method of the class:m[0].invoke(ti);}catch(Exception e) {// Print the wrapper exception:System.out.println("Wrapper exception: " + e);// Print the 'actual' exception:System.out.println("Underlying exception: " + e.getCause());}}}class TargetInvocation{public void foo() {// Dividing by zero to intentionally throw an exception:System.out.println(10 / 0);}}
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