java.lang.IllegalStateException:无法初始化上下文，因为已经存在根应用程序上下文 [英] java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present

问题描述

运行我的Web应用程序时，每隔一次尝试，我都会得到下面列出的stacktrace.请注意，据我所知，在web.xml中似乎没有多个ContextLoader定义.此外，该应用程序可以在第二/第四/等位置正常运行.时间.这种行为比根本行不通的调试起来要困难得多.谁能对此有所启发?

When running my webapp, I get the stacktrace listed below every other try. Note that there doesn't seem to be multiple ContextLoader definitions im web.xml as far as I can tell. Moreover, the app runs just fine the second/fourth/etc. time. This behaviour is much harder to debug than if it simply didn't work. Can anyone shed some light on this?

 java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:299)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4795)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5221)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:714)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:919)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1703)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

推荐答案

对于有类似问题的任何人-事实证明，该项目中使用的spring-jersey正在建立自己的上下文.我的上下文和春季球衣显然是按随机顺序初始化的. 此处更多信息:
https://java.net/jira/browse/JERSEY-2038
https://java.net/projects/jersey/lists/users/archive/2014-03/message/124
建议的解决方案:

For anyone with a similar problem - turns out that spring-jersey used in the project was setting up its own context. My context and the spring-jersey one were initialized in random order apparently. More info here:
https://java.net/jira/browse/JERSEY-2038
https://java.net/projects/jersey/lists/users/archive/2014-03/message/124
The suggested solution of adding:

servletContext.setInitParameter("contextConfigLocation", "<NONE>");

由于初始化顺序，在WebAppInitializer中，实现无法可靠地工作.解决该问题的方法是添加它的xml等效项:

In WebAppInitializer implementation didn't work reliably due to initialization order. What solved the problem was adding its xml equivalent:

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value></param-value>
</context-param> 

作为web.xml中的firt参数，请确保在初始化上下文之前将其设置.

as the firt parameter in web.xml, ensuring that its set before the context is initialized.

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