Dubbox和C3P0集成：NoClassDefFoundError错误

最新推荐文章于 2019-09-10 11:55:38 发布

原创最新推荐文章于 2019-09-10 11:55:38 发布 · 781 阅读

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#dubbo #c3p0

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本文记录了在尝试将Dubbo与C3P0数据库连接池集成时遇到的问题及解决过程。主要分析了由于Filter配置不当导致的启动失败，并通过调整配置解决了这一难题。

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Dubbox加入C3P0

框架集成很简单，正常集成，正常添加；

报错操作

添加了Dubbo的Filter，代码如下，provider.xml中添加

<dubbo:provider filter="AppInvokeLogFilter"/>

META-INF下添加dubbo/com.aliababa.dubbo.rpc.Filter文件，内容如下：

AppInvokerLogFilter=com.saillen.demo.filter.AppInvokeLogFilter

报错日志：

07-Mar-2017 18:02:20.578 ?? [Timer-0] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
 java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1305)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1293)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1158)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
    at com.mchange.v2.resourcepool.BasicResourcePool.checkIdleResources(BasicResourcePool.java:1481)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$2000(BasicResourcePool.java:32)
    at com.mchange.v2.resourcepool.BasicResourcePool$CheckIdleResourcesTask.run(BasicResourcePool.java:1964)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)

Exception in thread "Timer-0" java.lang.NoClassDefFoundError: com/mchange/v2/resourcepool/BasicResourcePool$AsyncTestIdleResourceTask
    at com.mchange.v2.resourcepool.BasicResourcePool.checkIdleResources(BasicResourcePool.java:1481)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$2000(BasicResourcePool.java:32)
    at com.mchange.v2.resourcepool.BasicResourcePool$CheckIdleResourcesTask.run(BasicResourcePool.java:1964)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)
Caused by: java.lang.ClassNotFoundException: Illegal access: this web application instance has been stopped already. Could not load [com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1295)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1158)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
    ... 5 more
Caused by: java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1305)
    at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1293)
    ... 7 more

报错分析：

删除provider.xml中关于provider的filter配置后可以正常启动，所以初步怀疑以下三点原因：

dubbo的filter中有和c3p0冲突的包；
dubbo的filter书写方式不正确，或者和tomcat容器集成有问题；
NoClassDefFoundError前还有一个Illegal access提示，可能是Tomcat的内存设置不够，或者C3P0占用内存过大（OOM？），加入了filter后，需要load更多class，方法区内存不够？（可能性不大）