tomcat后台报错，服务崩溃，请高人指点?报错

是不是发生在应用重载的时候？在实际环境中不要让tomcat重载，有修改程序重启tomcat

谢谢！我仔细看了一下服务的异常，感觉是内存环节的问题于是，我在启动参数中增加了jvm的内存配置项，目前正在观察，如果不在报错，则，有可能就是内存线程缺乏有效收集而造成的线程异常。即便服务恢复正常，我也将连续观察，看是否重复出现此异常。

我没懂你的意思。

1.这是上线的服务，所以，不会发生开发环节中的重载服务。

2.没有修改服务。我不记得以前是否遇到过同样的问题，因为，时间太久，开发笔记一直都没有整理。

希望遇到同样问题的高手出来指点一下。我怀疑是jar包太旧

/--Encapsulatedexception------------\
java.lang.NullPointerException
    atorg.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:2892)
    atorg.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2753)
    atorg.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1148)
    atorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1643)
    atorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
    atcom.opensymphony.xwork2.conversion.impl.XWorkConverter.lookup(XWorkConverter.java:375)
    atcom.opensymphony.xwork2.conversion.impl.XWorkConverter.lookup(XWorkConverter.java:401)
    atcom.opensymphony.xwork2.conversion.impl.XWorkConverter.convertValue(XWorkConverter.java:310)
    atcom.opensymphony.xwork2.ognl.OgnlTypeConverterWrapper.convertValue(OgnlTypeConverterWrapper.java:39)
    atognl.OgnlRuntime.getConvertedType(OgnlRuntime.java:1060)
    atognl.OgnlRuntime.getConvertedTypes(OgnlRuntime.java:1077)
    atognl.OgnlRuntime.getConvertedMethodAndArgs(OgnlRuntime.java:1103)
    atognl.OgnlRuntime.getAppropriateMethod(OgnlRuntime.java:1189)
    atognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1203)
    atognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1474)
    atognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85)
    atognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162)
    atcom.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27)
    atognl.OgnlRuntime.setProperty(OgnlRuntime.java:2245)
    atognl.ASTProperty.setValueBody(ASTProperty.java:127)
    atognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
    atognl.SimpleNode.setValue(SimpleNode.java:301)
    atognl.ASTChain.setValueBody(ASTChain.java:227)
    atognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
    atognl.SimpleNode.setValue(SimpleNode.java:301)
    atognl.Ognl.setValue(Ognl.java:737)
    atcom.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:209)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:173)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:160)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:151)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:288)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:199)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    atorg.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
    atorg.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    atorg.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
    atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
    atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    atorg.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
    atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    atorg.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    atjava.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    atjava.lang.Thread.run(Thread.java:619)

继续报错，有没有高手能帮我看看？

com.opensymphony.xwork2.util.logging.commons.CommonsLoggerwarn
警告:Errorsettingexpression'class['classLoader']['resources']'withvalue'[Ljava.lang.String;@1cdc866'
ognl.MethodFailedException:Method"setResources"failedforobjectWebappClassLoader
 context:/
 delegate:false
 repositories:
  /WEB-INF/classes/
---------->ParentClassloader:
org.apache.catalina.loader.StandardClassLoader@1c282a1
 [java.lang.NoSuchMethodException:org.apache.catalina.loader.WebappClassLoader.setResources([Ljava.lang.String;)]
    atognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1285)
    atognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1474)
    atognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85)
    atognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162)
    atcom.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27)
    atognl.OgnlRuntime.setProperty(OgnlRuntime.java:2245)
    atognl.ASTProperty.setValueBody(ASTProperty.java:127)
    atognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
    atognl.SimpleNode.setValue(SimpleNode.java:301)
    atognl.ASTChain.setValueBody(ASTChain.java:227)
    atognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220)
    atognl.SimpleNode.setValue(SimpleNode.java:301)
    atognl.Ognl.setValue(Ognl.java:737)
    atcom.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:209)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:173)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:160)
    atcom.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:151)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:288)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:199)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    atcom.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atcom.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
    atcom.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    atorg.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    atorg.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
    atorg.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    atorg.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
    atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    atorg.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    atorg.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    atorg.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    atorg.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
    atorg.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
    atorg.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    atorg.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    atorg.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
    atorg.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    atorg.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
    atorg.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    atorg.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    atorg.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
    atjava.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    atjava.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    atjava.lang.Thread.run(Thread.java:619)
Causedby:java.lang.NoSuchMethodException:org.apache.catalina.loader.WebappClassLoader.setResources([Ljava.lang.String;)
    atognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1226)
    ...75more

死锁

请具体阐述

换druid试试，我之前用c3p0报过这个错误，你这个项目用的是DBCP吧

回复 @netjourney:所以我还是建议不要用c3p0 @wang_liran非常感谢，是同样的bug回复 @netjourney:貌似据说这是C3p0的一个bug，http://weifly.iteye.com/blog/1227182，参考一下谢谢答复这个项目用的是c3p0。我也认为是这个连接池包造成的bug报错。后来，开打了jvm和一些辅助设置，并提高了内存设置，服务器在报c3p0异常的时候，服务并没有崩溃。所以，至少先解决了c3p0异常导致服务崩溃的情况。

连接池线程数太小吧？

没错，确实是线程数太少，并且，jvm配置内存太小造成的。此问题已经从很小方面解决了。但tomcat服务还有配置问题