Invocationtargetexception null

As briefly mentioned in the introduction, an InvocationTargetException is automatically generated by reflection-related objects, and wraps or attaches itself to the underlying, actual exception type that caused the problem. This occurs when calling the java. The invokeGetTaglineMethod method shows a basic, working example of using Java reflection to invoke a class instance method Book.

Book , from which we can retrieve the declared getTagline method. Since this is an instance method, we need to pass an instance of the object as the first argument, so this is where we use the book object that was created at the beginning. Executing this code results in the book object output, followed by the output from calling getTagline. As its name suggests, Book. Since the Book. InvocationTargetException being thrown.

However, a Throwable object implements the getCause method, which returns the causal exception if applicable. In the case of a InvocationTargetException instance, the cause is always the underlying exception object that occurred inside the invoked method, so checking for a cause when catching such exceptions is a good idea. Provides programmatic access to the stack trace information printed by printStackTrace.

Returns an array containing all of the exceptions that were suppressed, typically by the try -with-resources statement, in order to deliver this exception. Sets the Handle property. Sets the stack trace elements that will be returned by getStackTrace and printed by printStackTrace and related methods. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback?

Namespace: Java. Reflect Assembly: Mono. In this article. A constructor used when creating managed representations of JNI objects; called by the runtime. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy. Object java. Throwable java. Exception java. ReflectiveOperationException java.