本文介绍了java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在实现轻松的网络服务，我正在使用 jboss 4.0，但我收到以下异常...
I am implementing rest easy web service and i am using jboss 4.0 but i am getting following exception...
java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration
我的 web.xml 是
my web.xml is
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>RestfulWebService</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<!-- <servlet>
<servlet-name>HelloServlet</servlet-name>
<load-on-startup>1</load-on-startup>
</servlet> -->
<!-- <servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>javax.ws.rs.core.Application</servlet-class>
</servlet> -->
<listener>
<listener-class>
org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
</listener-class>
</listener>
<!-- <context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param> -->
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-class>
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.websevices.TestService</param-value>
</init-param>
</servlet>
<!-- <servlet-mapping>
<servlet-name>javax.ws.rs.core.Application</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping> -->
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
<context-param>
<param-name>resteasy.servlet.mapping.prefix</param-name>
<param-value>/rest</param-value>
推荐答案
从异常中可以清楚地看出类加载器无法找到类 Configuration(来自 javax/ws/rs/core/Configuration).
From the Exception its clear that The class loader is not able to find the class Configuration (from javax/ws/rs/core/Configuration).
请检查classpath，对应的JAR文件，并确保class文件存在.
Please check classpath, corresponding JAR file and make sure that the class file exist.
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