NoClassDefFoundError: Could not initialize class org.springframework.web.client.RestTemplate

项目在windows环境下可以正常运行，放到linux系统中访问这个接口就会报错，其他接口都没有问题。org.springframework.web-3.0.6.RELEASE.jar这个jar包我已经放到了正确的路径，但还是报NoClassDefFoundError，注意，不是ClassNotFound，是指编译的时候能正常编译，运行时找不到指定的类，主要问题在于org.springframework.web.client.RestTemplate这个类不能初始化，但是该怎么解决呢，求大神帮忙。以下是异常的详细报告。

exception

java.lang.RuntimeException: javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: Could not initialize class org.springframework.web.client.RestTemplate
	com.google.common.base.Throwables.propagate(Throwables.java:160)
	com.xinhunbao.jersey.AppFilter.doFilter(AppFilter.java:85)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

root cause

javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: Could not initialize class org.springframework.web.client.RestTemplate
	org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:489)
	org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
	com.xinhunbao.jersey.AppFilter.doFilter(AppFilter.java:74)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

root cause

org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: Could not initialize class org.springframework.web.client.RestTemplate
	org.glassfish.jersey.servlet.internal.ResponseWriter.rethrow(ResponseWriter.java:278)
	org.glassfish.jersey.servlet.internal.ResponseWriter.failure(ResponseWriter.java:260)
	org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:509)
	org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:334)
	org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
	org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
	org.glassfish.jersey.internal.Errors.process(Errors.java:315)
	org.glassfish.jersey.internal.Errors.process(Errors.java:297)
	org.glassfish.jersey.internal.Errors.process(Errors.java:267)
	org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
	org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
	org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
	org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)
	org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)
	org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
	com.xinhunbao.jersey.AppFilter.doFilter(AppFilter.java:74)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

经过几天的苦思冥想与尝试，终于找到了问题所在。根源问题在于pom.xml文件中的配置，关于这两个jar包的配置如下：

<dependency>
    <groupId>com.lala.api</groupId>
    <artifactId>core</artifactId>
    <version>3.0.6.RELEASE</version>
    <scope>system</scope>
    <systemPath>${basedir}/lib/org.springframework.core-3.0.6.RELEASE.jar</systemPath>
</dependency>

<dependency>
    <groupId>com.lala.api</groupId>
    <artifactId>web</artifactId>
    <version>3.0.6.RELEASE</version>
    <scope>system</scope>
    <systemPath>${basedir}/lib/org.springframework.web-3.0.6.RELEASE.jar</systemPath>
</dependency>

问题就出在这儿，这样的配置在编译时没有问题，但是使用mvn package打包时报了一个警告：

[WARNING] 'dependencies.dependency.systemPath' for com.lala.api:core:jar should not point at files within the project directory, ${basedir}/lib/org.springframework.core-3.0.6.RELEASE.jar will be unresolvable by dependent projects @ line 240, column 25
[WARNING] 'dependencies.dependency.systemPath' for com.lala.api:web:jar should not point at files within the project directory, ${basedir}/lib/org.springframework.web-3.0.6.RELEASE.jar will be unresolvable by dependent projects @ line 248, column 25

意思是说无法通过systemPath的路径在文件夹中定位这两个jar包，所以在tomcat运行后报NoClassDefFoundError。

解决方法如下：找到jar包所在的文件夹lib，运行cmd指令：

mvn install:install-file -Dfile=org.springframework.core-3.0.6.RELEASE.jar -DgroupId=org.springframework -DartifactId=core -Dversion=3.0.6.RELEASE -Dpackaging=jar
mvn install:install-file -Dfile=org.springframework.web-3.0.6.RELEASE.jar -DgroupId=org.springframework -DartifactId=web -Dversion=3.0.6.RELEASE -Dpackaging=jar

这样就可以将jar添加到maven本地仓库，然后在pom.xml中配置：

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>core</artifactId>
    <version>3.0.6.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>web</artifactId>
    <version>3.0.6.RELEASE</version>
</dependency>

然后打包运行服务就可以啦。

终于解决这个困扰我好久的难题，特别开心，哈哈。不敢自专，共飨诸君。

NoClassDefFoundError: Could not initialize class org.springframework.web.client.RestTemplate

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