java - 通过tomcat运行struts2时报错(错误包括 "java.util.concurrent.ThreadPoolExecutor.runWorker..."

Question

我是 Java 和 struts2 的新手 - 我编写了一个测试应用程序，它将从用户那里捕获信息(3 个字段)，将信息存储到 mysql，然后在表中显示信息(如果保存成功)成功(至少我认为这是我写的。

我感到很迷茫 - 我试图寻找解决我的问题的方法，但不确定首先要看哪条路...任何帮助都是有益的!

我正在使用:Netbeans 7.3.1、tomcat 7、jdk 1.7、mysql、struts2...

这是我在 netbeans 中运行时收到的错误...

PackageName (run):

compile-jsps:
Starting Tomcat process...
Waiting for Tomcat...
Tomcat server started.
In-place deployment at .../packageName/build/web
deploy?config=file%3A%2Fvar%2Ffolders%2Fjz%2Fbtt5nc_x5l3g29r_g7c8f3yc0000gn%2FT%2Fcontext1380170394207520336.xml&path=/Jive_OSInfo_NB
FAIL - Deployed application at context path /packageName but context failed to start
...packageName/nbproject/build-impl.xml:1039: The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 11 seconds)



Apache Tomcat Log:

Sep 26, 2013 10:38:31 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Sep 26, 2013 10:38:31 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Sep 26, 2013 10:38:31 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@28f9ed78')
Sep 26, 2013 10:38:34 PM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter struts2
Unable to load configuration. - bean - jar:file: .../build/web/WEB-INF/lib/struts2-core-2.3.4.jar!/struts-default.xml:29:72
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:450)
    at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:193)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4775)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5452)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:535)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1461)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1445)
    at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:860)
    at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:357)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:611)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)
Caused by: Unable to load configuration. - bean - jar:file: .../build/web/WEB-INF/lib/struts2-core-2.3.4.jar!/struts-default.xml:29:72
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)
    at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
    at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:437)
    ... 44 more
Caused by: Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file: .../build/web/WEB-INF/lib/struts2-core-2.3.4.jar!/struts-default.xml:29:72
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:239)
    at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:102)
    at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:156)
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
    ... 46 more
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file: ~/tomcat/lib/struts2-core-2.3.15.1.jar!/struts-default.xml:29:72 - bean - jar:file: .../build/web/WEB-INF/lib/struts2-core-2.3.4.jar!/struts-default.xml:29:72
    at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:223)
    ... 49 more

Answer 1

看起来您在类路径上有同一个 jar 的两个版本:

• struts2-core-2.3.15.1
• struts2-core-2.3.4

错误消息告诉您这两个 jar 都包含 com.opensymphony.xwork2.ObjectFactory。

要解决您的问题，您必须从类路径中删除其中一个版本(可能是 2.3.4)。如何做到这一点取决于您运行 web 应用程序和容器的方式。如果它是标准的 Tomcat 7 部署，您的重复 jar 可能会出现在您的 war 中(在 WEB-INF/lib 下)，或者如果您将它放在那里，也可能会出现在 Tomcat 的/lib 目录中。