When and How to Uncover the Root Cause of java.lang.reflect.InvocationTargetException?

What Leads to java.lang.reflect.InvocationTargetException and How to Identify Its Cause

An InvocationTargetException is encountered when trying to invoke a method using reflection, but instead of the expected exception, InvocationTargetException occurs. This discrepancy can be attributed to the added level of abstraction introduced by reflection.

Specifically, java.lang.reflect.InvocationTargetException encapsulates any exceptions that arise while executing the method call using reflection. This encapsulation allows you to distinguish exceptions caused by reflection call failures (e.g., invalid arguments) from those originating within the method being invoked.

To determine the root cause of the exception, you can either:

• Inspect the Stack Trace: Print the stack trace (exception.printStackTrace()) and examine the "Caused By:" section, which will display the underlying exception.
• Utilize the getCause() Method: Catch the exception and retrieve its cause using the getCause() method. This allows you to re-throw the actual exception or handle it appropriately. For example:

try {
    // Call method using reflection
} catch (InvocationTargetException ex) {
    log.error("Error occurred!", ex.getCause());
}

Remember, while InvocationTargetException serves as an indicator that an exception occurred during a reflection call, the underlying cause can be ascertained through proper investigation techniques.

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