Java lang reflect invocationtargetexception eclipse

“Java.lang.reflect.invocationtargetexception” – What Causes & How to fix it?

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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java.lang.reflect.invocationtargetexception

In this article, we will understand the meaning of the java.lang.reflect.invocationtargetexception, and why this exception is thrown.

Programs that need to be able to observe or alter the behavior of applications running inside the Java virtual machine frequently employ reflection. Developers with a firm command of the language’s foundations should be the only ones to use this feature because it is a relatively complex one. With that limitation in mind, a reflection is a strong tool that allows applications to execute tasks that would otherwise be impractical.

By establishing instances of extension objects with their fully qualified names, an application can utilize external, user-defined classes. Using the type of information provided by reflection in visual development environments can help developers write better code. Debuggers must be able to inspect private class members.

2. InvocationTargetException

This class extends ReflectiveOperationException, which is the common superclass of exceptions thrown by reflective operations in core reflection. InvocationTargetException is a checked exception that wraps an exception thrown by an invoked method or constructor.

Let us now create an example for it. We will create a very simple Application class with one method divide() . This method will take two parameters and will divide the first parameter by the second one:

public int divide (Integer a, Integer b) < return a/b; >

Now in the main method, we will get the method object from the getMethod() :

final Method method = Application.class.getMethod("divide", Integer.class, Integer.class);

Now invoke the method passing the parameters. Call the method with the second parameter as zero. This will result in ArithmeticException .

try < method.invoke(application, 1, 0); >catch (InvocationTargetException e)

package org.javacodegeeks; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class Application < public int divide (Integer a, Integer b) < return a/b; >public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException < Application application = new Application(); final Method method = Application.class.getMethod("divide", Integer.class, Integer.class); try < method.invoke(application, 1, 0); >catch (InvocationTargetException e) < e.printStackTrace(); >> >

When you run the above class you will see an error as below. The division by zero will result in ArithmeticException which will be consumed by InvocationTargetException :

If you want to know the actual cause of the exception when the InvocationTargetException is thrown then you can get the cause from the InvocationTargetException object.

try < method.invoke(application, 1, 0); >catch (InvocationTargetException e)

Below is the output you will see:

3. Conclusion

In this article, we learned about InvocationTargetException. First, we briefly discussed the Reflection API in Java. We discussed the case when InvocationTargetException can be thrown and we also discussed how we get the actual cause of the exception.

4. Download

This was an example displaying where Java InvocationTargetException gets thrown and how to handle it.

Download
You can download the full source code of this example here: java.lang.reflect.invocationtargetexception

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Исправление: Ошибка Java.lang.reflect.InvocationTargetException при использовании командный обозреватель везде 2010 SP1 для Eclipse для сохранения или просмотр рабочего элемента

В этом случае, сохранить или просмотреть завершится неудачно. Кроме того, появляется приведенное ниже сообщение об ошибке:

Причина

Эта проблема возникает из-за изменения в механизме JavaScript, появившееся в Internet Explorer 9. Изменение конфликтует вызывающего кода в уязвимых версиях Eclipse. Этот конфликт приводит к failaure функции для рабочего элемента, содержащий заполнены в командный обозреватель везде 2010 с пакетом обновления 1 элемент управления текстом в формате RTF. Таким образом сообщение об ошибке всплывает.

Решение

Сведения об исправлении

Исправление доступно для загрузки на следующий веб-узел центра загрузки корпорации Майкрософт: загрузить исправление. Дополнительные сведения о том, как загрузить файлы поддержки Майкрософт щелкните следующий номер статьи базы знаний Майкрософт:

119591 Как загрузить файлы технической поддержки Майкрософт через веб-службы Этот файл был проверен корпорацией Майкрософт на наличие вирусов. Корпорация Майкрософт использует самые последние на момент публикации файла версии антивирусного программного обеспечения. Файл хранится на защищенных серверах, что предотвращает его несанкционированное изменение. Примечание. Чтобы установить данное исправление, выполните следующие действия.

1. Сохраните файл Tfseclipseplugin-updatesitearchive-10.1.0-qfe1.zip пакета исправлений в локальной папке.
2. Запустите Eclipse.
3. В меню Справка выберите пункт Установки нового программного обеспечения.
4. Нажмите кнопку Добавить.
5. В поле имя введите подключаемый модуль архивации локальной командный обозреватель и нажмите кнопку Архивировать.
6. Выберите файл Tfseclipseplugin-updatesitearchive-10.1.0-qfe1.zip, который был сохранен в локальной папке и нажмите кнопку ОК.
7. В диалоговом окне установки выберите установите флажок, соответствующий командный обозреватель везде в списке функций.
8. Два раза нажмите кнопку Далее .
9. Принять условия лицензионного соглашения на использование программного обеспечения корпорации Майкрософт, а затем нажмите кнопку Далее.
10. Нажмите кнопку Завершить.

Дополнительные сведения об установке подключаемого модуля Team Foundation Server и клиентом командной строки загрузить и просмотреть веб-страницу Майкрософт:

Предварительные условия

Для установки этого исправления необходимо иметь Microsoft Visual Studio командный обозреватель везде 2010 на компьютере установлен Пакет обновления 1 (SP1).

Необходимость перезагрузки

После установки этого исправления необходимо перезапустить Eclipse.

Сведения о замене исправлений

Это исправление не заменяет ранее выпущенные исправления.

Сведения о файлах

Глобальная версия этого исправления содержит атрибуты файла (или более поздние атрибуты файлов), приведенные в следующей таблице. Дата и время для файлов указаны в формате UTC. При просмотре сведений о файлах выполняется перевод соответствующих значений в местное время. Чтобы узнать разницу между временем UTC и местным временем, откройте вкладку Часовой пояс элемента Дата и время панели управления.

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FIX: Java.lang.reflect.InvocationTargetException error when you use Team Explorer Everywhere 2010 SP1 for Eclipse to save or view a work item

This issue occurs because of a change in JavaScript engine that is introduced in Internet Explorer 9. The change conflicts the invoking code in the affected Eclipse versions. This conflict causes a failaure in a feature for the work item that contains a rich text filed control in Team Explorer Everywhere 2010 SP1.Therefore, the error message pops up.

Resolution

Hotfix information

The hotfix is available for download from the following Microsoft Download Center website:

Download the hotfix package now.
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Note To install this hotfix, follow these steps:

1. Save the Tfseclipseplugin-updatesitearchive-10.1.0-qfe1.zip file of the hotfix package in a local folder.
2. Start Eclipse.
3. On the Help menu, click Install New Software.
4. Click Add.
5. Type Local Team Explorer plug-in archive in the Name box, and then click Archive.
6. Select the Tfseclipseplugin-updatesitearchive-10.1.0-qfe1.zip file that you saved in a local folder, and then click OK.
7. In the Install dialog box, click to select the check box that corresponds to Team Explorer Everywhere from the list of features.
8. Click Next two times.
9. Accept the Microsoft Software License Terms, and then click Next.
10. Click Finish.

For more information about how to install Team Foundation Server plug-in and the Command-line Client, download and then view the following Microsoft webpage:

Prerequisites

To install this hotfix, you must have Microsoft Visual Studio Team Explorer Everywhere 2010 Service Pack 1 (SP1) installed on a computer.

Restart information

You must restart Eclipse after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

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