java.lang.NoClassDefFoundError:javax/ws/rs/core/Configuration

Question

我正在实现休息简单的Web服务,我正在使用jboss 4.0,但我得到以下异常...

java.lang.NoClassDefFoundError: javax/ws/rs/core/Configuration

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>

Answer 1

从基于servlet的项目迁移/复制依赖项到独立时,很容易遇到此类错误.对于基于servlet的项目,通常需要依赖于scope ='provided'依赖于servlet提供的实现:

依赖性导致错误:

<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.0.1</version>
    <scope>provided</scope>
</dependency>

但是对于独立项目,没有servlet实现,因此您需要将javax.ws.rs-api复制到classpath.通常,您只需删除<scope>提供的</ scope>行并具有直接依赖性:

固定依赖:

<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.0.1</version>
</dependency>

Answer 2

从异常中可以清楚地看出，类加载器无法找到类配置（来自 javax/ws/rs/core/Configuration）。

请检查类路径、相应的JAR文件并确保类文件存在。