【异常】java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher异常解决方法

  今天在做web项目时用到JSONObject，用的是MyEclipse自动导入的struts2的lib，其中自带了json-lib-2.1-jdk15.jar。

    在struts2的action中已经导入了net.sf.json.JSONObject包。发现用到JSONObject jsonObject = new JSONObject()时，MyEclipse是没有报错的，但是到了JSONObject jsonObject = new JSONObject()时就是执行不下去！

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.reflect.InvocationTargetException
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
……………………
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

root cause

java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
mapsns.action.Login.login(Login.java:34)
……………………
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

root cause

java.lang.ClassNotFoundException: net.sf.ezmorph.Morpher
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
……………………
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.30 logs.

Apache Tomcat/7.0.30

        其中发现java.lang.ClassNotFoundException: net.sf.ezmorph.Morpher，很明显是没有找到相应的class。原来是除了要导入json-lib-2.1-jdk15.jar包外，还要导入其它几个依赖包：commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar

      点击下载依赖jar包

       导入这几个依赖包之后就不再出错了！