javax.naming.NoInitialContextException：无法实例化类： [英] javax.naming.NoInitialContextException: Cannot instantiate class:

问题描述

我正在尝试实现 tutorialpoint 中描述的简单EJB应用程序，使用JBoss 5.1和Eclipse作为IDE，我将项目创建为EJB3。但是出现以下错误

I'm trying to implement Simple EJB Application Described in tutorialpoint and I’m using JBoss 5.1 and eclipse as IDE and i created project as EJB 3. but I’m getting the below error

javax.naming.NoInitialContextException: Cannot instantiate class:   org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:307)
at javax.naming.InitialContext.init(InitialContext.java:242)
at javax.naming.InitialContext.<init>(InitialContext.java:216)
at com.tutorialspoint.test.EJBTester.<init>(EJBTester.java:42)
at com.tutorialspoint.test.EJBTester.main(EJBTester.java:51)
Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:72)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:61)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:671)
... 5 more
java.lang.NullPointerException
at com.tutorialspoint.test.EJBTester.testStatelessEjb(EJBTester.java:65)
at com.tutorialspoint.test.EJBTester.main(EJBTester.java:53)
null

有人可以指导我吗？

推荐答案

您需要添加一个类为 org.jnp.interfaces.NamingContextFactory 到客户端代码中的类路径。

You need to add a jar with class org.jnp.interfaces.NamingContextFactory to the classpath in your client code.

您可以此处。如果出现版本不匹配错误，请确保为jboss 5.x获取合适的jar。

You can get it here. Make sure to get the appropriate jar for jboss 5.x if you get a version mismatch error.

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