Fundamental classes for the design of the Java programming language are provided by Java.lang. The two most essential classes are object, which serves as the foundation of the class hierarchy, and class, whose instances serve as run-time representations of classes. “Java.lang.reflect.invocationtargetexception” is a common error. Let’s read this article to find the best way to fix it.

When do you encounter the error “java.lang.reflect.invocationtargetexception”?

When you are trying to write a class with a method, you may encounter the followingg error:

public class InvocationTargetExample {
public int divideByZeroExample() {
return 1 / 0;
}
}

The reflection layer is where it mostly happens when you try to call a constructor or function that itself throws an error “Java.lang.reflect.invocationtargetexception”. The InvocationTargetException is a wrapper created by the reflection layer around the method’s real error.

The InvocationTargetException that is issued when invoking the method has been asserted. The fact that the actual exception, in this example an ArithmeticException, is wrapped up in an InvocationTargetException is crucial to keep in mind. Now, why doesn’t reflection first throw the actual exception? The rationale is that it enables us to determine if the Exception happened because the method’s reflection layer failed to call it or because it happened inside the method itself.

What are the best solutions to fix the error “java.lang.reflect.invocationtargetexception”?

Solution 1: Utilize Throwable.getCause()

The simplest solution for you to handle with your problem is utilizing Throwable.getCause(). Let’s follow the guide below:

In this case, InvocationTargetException is caused by the real underlying exception, hence you can utilize Throwable.getCause() to get the detail of it.

In the same example as earlier, let’s see how you can use getCause() to obtain the real exception:

assertEquals(ArithmeticException.class, exception.getCause().getClass());

The exception object that was thrown has been subjected to your use of the getCause() method. Furthermore, you claimed that ArithmeticException.class was the reason for the exception.

Once you get the underlying exception, you may either re-throw it, wrap it in a custom exception, or simply log it in accordance with what is needed.

Solution 2: Simply unwrap the InvocationTargetException’s cause

Another solution for you to solve the error “java.lang.reflect.invocationtargetexception” is simply unwrapping the InvocationTargetException’s cause.

By using reflection to invoke the method, you have increased the level of abstraction. Any exception thrown by the reflection layer is wrapped in an InvocationTargetException, which makes it possible to distinguish between errors that occurred during the reflection call (maybe your argument list wasn’t acceptable, for example) and errors that occurred during the method call.

You can find the original cause by simply unwrapping the InvocationTargetException’s cause.

After doing that, your error will completely disappear and your program will run well without any errors. So, let’s do it to get your desired results.

Conclusion

The error “java.lang.reflect.invocationtargetexception” is a confusing problem. We hope that you enjoy our article about the error. With this knowledge, we know that you can fix your error quickly by following these steps! If you still have any other questions about fixing this syntax error, please leave a comment below. Thank you for reading!

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