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首页 > 解决方案 > 运行 java 类时，Tomcat 服务器不会在 Eclipse 中启动。引起：java.lang.NoClassDefFoundError: org/json/JSONException

java - 运行 java 类时，Tomcat 服务器不会在 Eclipse 中启动。引起：java.lang.NoClassDefFoundError: org/json/JSONException

问题描述

当试图在 Eclipse 中运行我的 java 类时，Tomcat 服务器不会启动。关于 java.lang.NoClassDefFoundError: org/json/JSONException 和 java.lang.ClassNotFoundException: org.json.JSONException 有几个错误。我在我的项目中导入了 org.json.JSONException，并在我的项目构建路径中添加了 org.json.jar 作为外部 jar。Org.json.jar 也包含在我的 CLASSPATH 环境变量中。任何意见是极大的赞赏。

尝试启动服务器时 Eclipse 中的控制台错误指出：

SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/URL6]]
    at java.util.concurrent.FutureTask.report(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:931)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/URL6]]
    at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
    ... 6 more
Caused by: java.lang.NoClassDefFoundError: org/json/JSONException
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Unknown Source)
    at java.lang.Class.getDeclaredFields(Unknown Source)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: org.json.JSONException
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
    ... 19 more

项目构建配置

类路径

标签： javajsoneclipsetomcat8

解决方案

打开项目的 Deployment Assembly 属性页面，并确保将 jar 设置为作为应用程序的一部分进行部署。CLASSPATH 环境变量不会影响 Tomcat，一般情况下您应该停止依赖它。

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