我们的制作环境如下：
Tomcat 7.0.61
Apache 2.4.16 在Windows Server 2008 R2 64位计算机上。
它有7个驱动器，每个700GB。很多未使用的内存。
CPU看起来不错，内存使用情况也很好。
昨天正常，应用程序已经挂起，我们不得不重启Tomcat服务〜7次。
我发现了这个错误，并想知道是否有人知道什么是错的？ 因为它工作正常几天ag现在我们不断重启tomcat：/
Tomcat server.xml
<Service name="Catalina">
<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" packetSize="65536"/>
<Engine name="Catalina" defaultHost="localhost">
catalina.log
Feb 26, 2016 5:04:16 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18245 Feb 26, 2016 5:04:50 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18245 Feb 26, 2016 5:05:27 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18501 Feb 26, 2016 5:05:33 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Feb 26, 2016 5:45:18 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18245 Feb 26, 2016 5:55:34 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18245 Feb 26, 2016 5:57:57 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18245 Feb 26, 2016 6:06:56 AM org.apache.coyote.ajp.AjpMessage processHeader
SEVERE: Invalid message received with signature 18501 Feb 26, 2016 6:07:02 AM org.apache.coyote.http11.AbstractHttp11Processor process
INFO: Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
Feb 26, 2016 8:18:43 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-apr-8080"] Feb 26, 2016 8:18:43 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-apr-8009"] Feb 26, 2016 8:18:43 AM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Feb 26, 2016 8:18:43 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 9 instance(s) to be deallocated for Servlet [Faces Servlet] Feb 26, 2016 8:18:45 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 9 instance(s) to be deallocated for Servlet [Faces Servlet] Feb 26, 2016 8:18:45 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 90 instance(s) to be deallocated for Servlet [jsp] Feb 26, 2016 8:18:46 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 90 instance(s) to be deallocated for Servlet [jsp] Feb 26, 2016 8:18:47 AM org.apache.catalina.core.StandardWrapper unload
INFO: Waiting for 90 instance(s) to be deallocated for Servlet [jsp] Feb 26, 2016 8:18:48 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/da8] registered the JDBC driver [net.sourceforge.jtds.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Feb 26, 2016 8:18:48 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/da8] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Feb 26, 2016 8:18:48 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/da8] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation.
Feb 26, 2016 8:18:48 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/da8] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation.
还有这个：
Feb 26, 2016 8:18:49 AM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already. Could not load org.apache.log4j.spi.ThrowableInformation. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:165)
at org.apache.log4j.Category.forcedLog(Category.java:391)
at org.apache.log4j.Category.log(Category.java:856)
at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:257)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:920)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460)
at org.apache.jsp.WEB_002dINF.jsp.layouts.BodyLayout_jsp._jspx_meth_tiles_005finsert_005f1(BodyLayout_jsp.java:228)
at org.apache.jsp.WEB_002dINF.jsp.layouts.BodyLayout_jsp._jspx_meth_f_005fsubview_005f0(BodyLayout_jsp.java:202)
at org.apache.jsp.WEB_002dINF.jsp.layouts.BodyLayout_jsp._jspService(BodyLayout_jsp.java:106)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:604)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:543)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:954)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:656)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:101)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:137)
at org.apache.struts.taglib.tiles.InsertTag.doInclude(InsertTag.java:758)
at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:890)
at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460)
at org.apache.jsp.WEB_002dINF.jsp.layouts.ClassicLayout_jsp._jspx_meth_tiles_005finsert_005f1(ClassicLayout_jsp.java:459)
at org.apache.jsp.WEB_002dINF.jsp.layouts.ClassicLayout_jsp._jspx_meth_f_005fsubview_005f1(ClassicLayout_jsp.java:433)
at org.apache.jsp.WEB_002dINF.jsp.layouts.ClassicLayout_jsp._jspx_meth_f_005ffacet_005f1(ClassicLayout_jsp.java:402)
at org.apache.jsp.WEB_002dINF.jsp.layouts.ClassicLayout_jsp._jspx_meth_f_005fview_005f0(ClassicLayout_jsp.java:207)
at org.apache.jsp.WEB_002dINF.jsp.layouts.ClassicLayout_jsp._jspService(ClassicLayout_jsp.java:106)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)
at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.dispatch(JspTilesViewHandlerImpl.java:233)
at org.apache.myfaces.application.jsp.JspTilesViewHandlerImpl.renderView(JspTilesViewHandlerImpl.java:219)
at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at mil.dla.daps.web.AuthorizationFilter.doFilter(AuthorizationFilter.java:80)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2476)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2465)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)