java.lang.NoClassDefFoundError: javax/persistence/Persistence
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java.lang.NoClassDefFoundError: javax/persistence/Persistence
提问by mehdi shahdoost
i'm using Netbeans 6.8 and build simple Maven web application project.
我正在使用 Netbeans 6.8 并构建简单的 Maven Web 应用程序项目。
create Entity and main file for persist Entity [also create persist unit] and use EclipsLink.
为持久实体创建实体和主文件 [也创建持久单元] 并使用 EclipsLink。
but when i run main file get this error :
但是当我运行主文件时出现此错误：
Exception in thread "main" java.lang.NoClassDefFoundError: javax/persistence/Persistence
at Main.main(Main.java:34)
Caused by: java.lang.ClassNotFoundException: javax.persistence.Persistence
at java.net.URLClassLoader.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 1 more
in netbeans projects window and in my project libraries folder only add this package :
在 netbeans 项目窗口和我的项目库文件夹中只添加这个包：
javaee-web-api-6.0.jar [provided]
javaee-web-api-6.0.jar [提供]
please help me for solve this Error
请帮我解决这个错误
thanks
谢谢
回答by Binil Thomas
In your pom.xmlyou need to add a dependency to JPA libraries.
在您pom.xml需要向 JPA 库添加依赖项。
回答by Hunter Zhao
回答by Bwire
Just incase you stumble upon this. Another problem could be you have a project importing another project the parent project is the one who is supposed to hold all the libraries.
以防万一你偶然发现了这一点。另一个问题可能是您有一个项目正在导入另一个项目，而父项目是应该保存所有库的项目。
回答by Francisco Fontes
I had the same problem and I solved it by changing the dependenciesto the following :
我遇到了同样的问题，我通过将依赖项更改为以下内容来解决它：
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
回答by Amit Mishra
for maven quickstart artifacts:-
对于 Maven 快速入门工件：-
This problems generally occures when there is no hibernate-jpa-2.0-api jar in classpath so first add this jar in your classpath. if still you are getting excption then go to C:\Users\(system user name)\.m2\repository\org\hibernate; delete folder javax. after that again download jars from pom.xml it will work.
当类路径中没有 hibernate-jpa-2.0-api jar 时，通常会出现此问题，因此请先在类路径中添加此 jar。如果仍然出现异常，请转到 C:\Users\(system user name)\.m2\repository\org\hibernate; 删除文件夹 javax. 之后再次从 pom.xml 下载 jars 它将工作。
for webapp:--
对于网络应用程序：--
first make sure hibernate-jpa-2.0-api jar downloaded and it is available in your build path. after that right click on project-->Build Path--->configure build path--->deployment Assembly--->Add--->java build path entries--->select the available jar(hibernate-jpa-2.0-api)--->next--->finish.
首先确保下载了 hibernate-jpa-2.0-api jar 并且它在您的构建路径中可用。之后右键单击项目-->构建路径--->配置构建路径--->部署程序集--->添加--->java构建路径条目--->选择可用的jar(hibernate-jpa- 2.0-api)--->下一步--->完成。
