Why Do You Get java.lang.reflect.InvocationTargetException When Using Reflection?

Understanding the Cause of java.lang.reflect.InvocationTargetException

When using reflection to invoke methods, it is not uncommon to encounter an InvocationTargetException instead of the expected exception thrown by the invoked method. This behavior is caused by the additional level of abstraction introduced by reflection.

When invoking a method via reflection, the exception is wrapped within an InvocationTargetException object. This allows the developer to differentiate between exceptions that originate from the reflection call (invalid arguments, etc.) and those that occur within the method being invoked.

To retrieve the original exception, one must unwrap it from the InvocationTargetException. This can be achieved by retrieving the cause using the getCause() method, or by examining the "Caused By:" section when calling exception.printStackTrace(). The original exception can then be handled or re-thrown accordingly.

By utilizing these techniques, developers can effectively handle exceptions that arise during method invocation using reflection, ensuring that the appropriate error conditions are addressed.

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