java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration
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java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration
提问by msg
I am implementing rest easy web service and i am using jboss 4.0 but i am getting following exception...
我正在实现轻松的网络服务，我正在使用 jboss 4.0，但我遇到了以下异常...
java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration
my web.xml is
我的 web.xml 是
<?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>
采纳答案by Pandiri
From the Exception its clear that The class loader is not able to find the class Configuration (from javax/ws/rs/core/Configuration).
从异常中可以看出类加载器无法找到类配置（来自 javax/ws/rs/core/Configuration）。
Please check classpath, corresponding JAR file and make sure that the class file exist.
请检查类路径、对应的JAR 文件并确保类文件存在。
回答by Alfishe
It's easy to meet such error when migrating/copying dependencies from servlet based project to standalone. For servlet based project one usually needs dependency with scope = 'provided' relying that servlet provides implementation:
将依赖项从基于 servlet 的项目迁移/复制到独立项目时，很容易遇到此类错误。对于基于 servlet 的项目，通常需要依赖 scope = 'provided' 依赖该 servlet 提供实现：
Dependency causing error:
导致错误的依赖：
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
<scope>provided</scope>
</dependency>
But for standalone projects there is no servlet implementation so you need to turn on copy javax.ws.rs-api to classpath. Usually you need just to remove <scope>provided</scope> line and have straightforward dependency:
但是对于独立项目，没有 servlet 实现，因此您需要打开将 javax.ws.rs-api 复制到类路径。通常你只需要删除 <scope>provided</scope> 行并有直接的依赖：
Fixed dependency:
固定依赖：
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
</dependency>
