java - 为什么我的服务器停止响应并且有办法监控它？

Question

我有一个在 Tomcat 8.0 中运行的 Java Web App。到目前为止，我的应用程序没有任何问题，但主要用户要求在应用程序的主页上显示几项内容，我一次添加这些内容的主要目的是在进行时测试功能。

最近在这里，我真的在进行测试，以确保该站点在准备好部署时能够正常工作。在背靠背进行了几次测试后，我注意到服务器似乎只是锁定了。起初我以为是内存空间，但我检查了所有日志，除了

29-Oct-2014 16:28:16.520 INFO [main] org.apache.catalina.core.AprLifecycleListener.init The APR 
based Apache Tomcat Native library which allows optimal performance in production environments 
was not found on the java.library.path:

其余的对我来说似乎很正常：

29-Oct-2014 16:28:16.658 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:28:16.682 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector     Using a shared selector for servlet write/read
29-Oct-2014 16:28:16.684 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:28:16.686 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
29-Oct-2014 16:28:16.686 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 344 ms
29-Oct-2014 16:28:16.703 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
29-Oct-2014 16:28:16.703 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.9
29-Oct-2014 16:28:16.718 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war
29-Oct-2014 16:28:17.281 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war has finished in 562 ms
29-Oct-2014 16:28:17.281 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\docs
29-Oct-2014 16:28:17.459 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\docs has finished in 178 ms
29-Oct-2014 16:28:17.459 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\examples
29-Oct-2014 16:28:17.786 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\examples has finished in 327 ms
29-Oct-2014 16:28:17.786 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\host-manager
29-Oct-2014 16:28:17.965 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\host-manager has finished in 179 ms
29-Oct-2014 16:28:17.965 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\manager
29-Oct-2014 16:28:18.119 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\manager has finished in 154 ms
29-Oct-2014 16:28:18.119 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\ROOT
29-Oct-2014 16:28:18.261 INFO [localhost-startStop-1]     org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory     C:\Tomcat 8.0\webapps\ROOT has finished in 142 ms
29-Oct-2014 16:28:18.262 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:28:18.267 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:28:18.268 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in     1581 ms

commons-dqemon.2014-10-29：

[2014-10-29 16:11:18] [info]  [ 5144] Commons Daemon procrun (1.0.15.0 64-bit) started
[2014-10-29 16:11:18] [info]  [ 5144] Running 'Tomcat8' Service...
[2014-10-29 16:11:18] [info]  [ 3344] Starting service...
[2014-10-29 16:11:19] [info]  [ 3344] Service started in 1106 ms.
[2014-10-29 16:27:57] [info]  [ 6536] Stopping service...
[2014-10-29 16:28:02] [info]  [ 6536] Service stop thread completed.
[2014-10-29 16:28:02] [info]  [ 5144] Run service finished.
[2014-10-29 16:28:02] [info]  [ 5144] Commons Daemon procrun finished
[2014-10-29 16:28:16] [info]  [ 6532] Commons Daemon procrun (1.0.15.0 64-bit) started
[2014-10-29 16:28:16] [info]  [ 6532] Running 'Tomcat8' Service...
[2014-10-29 16:28:16] [info]  [ 7900] Starting service...
[2014-10-29 16:28:17] [info]  [ 7900] Service started in 1111 ms.

tomcat8-stdout.2014-10-29：

2014-10-29 16:11:18 Commons Daemon procrun stdout initialized
Session ID 7D825AD72EAFB71E3E22DC3FBE59D196 destroyed at Wed Oct 29 16:12:20 EDT 2014
Session ID 8F72C027CFB28678FFE8A614353BBED7 created at Wed Oct 29 16:16:47 EDT 2014
Session ID 8F70D0F8CE0EBC149412E6DC9525AC55 created at Wed Oct 29 16:27:40 EDT 2014

2014-10-29 16:28:16 Commons Daemon procrun stdout initialized
Session ID 8F72C027CFB28678FFE8A614353BBED7 destroyed at Wed Oct 29 16:34:18 EDT 2014

直到我到达服务器锁定并终止应用程序的地步，然后我收到一个错误，说明应用程序在终止时仍在处理请求，并且存在内存泄漏的潜在威胁。在下面的 catalina 日志文件中提供：

29-Oct-2014 16:11:19.169 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:11:19.190 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
29-Oct-2014 16:11:19.192 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:11:19.194 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
29-Oct-2014 16:11:19.194 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 337 ms
29-Oct-2014 16:11:19.209 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
29-Oct-2014 16:11:19.209 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.9
29-Oct-2014 16:11:19.224 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war
29-Oct-2014 16:11:19.788 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war has finished in 563 ms
29-Oct-2014 16:11:19.788 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\docs
29-Oct-2014 16:11:19.960 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\docs has finished in 172 ms
29-Oct-2014 16:11:19.960 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\examples
29-Oct-2014 16:11:20.303 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\examples has finished in 343 ms
29-Oct-2014 16:11:20.303 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\host-manager
29-Oct-2014 16:11:20.472 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\host-manager has finished in 169 ms
29-Oct-2014 16:11:20.472 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\manager
29-Oct-2014 16:11:20.633 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\manager has finished in 161 ms
29-Oct-2014 16:11:20.634 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\ROOT
29-Oct-2014 16:11:20.790 INFO [localhost-startStop-1]     org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory     C:\Tomcat 8.0\webapps\ROOT has finished in 156 ms
29-Oct-2014 16:11:20.792 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:11:20.797 INFO [main] org.apache.coyote.AbstractProtocol.start Starting     ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:11:20.798 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in     1603 ms
29-Oct-2014 16:27:57.767 INFO [Thread-6] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:27:57.820 INFO [Thread-6] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:27:57.870 INFO [Thread-6] org.apache.catalina.core.StandardService.stopInternal Stopping service Catalina
29-Oct-2014 16:27:57.885 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload Waiting for 1 instance(s) to be deallocated for Servlet [LoginControl]
29-Oct-2014 16:27:58.885 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload Waiting for 1 instance(s) to be deallocated for Servlet [LoginControl]
29-Oct-2014 16:27:59.885 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload Waiting for 1 instance(s) to be deallocated for Servlet [LoginControl]
29-Oct-2014 16:27:59.986 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload Waiting for 1 instance(s) to be deallocated for Servlet [DirectoryAssistance]
29-Oct-2014 16:28:00.986 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload Waiting for 1 instance(s) to be deallocated for Servlet [DirectoryAssistance]
29-Oct-2014 16:28:01.986 INFO [localhost-startStop-2] org.apache.catalina.core.StandardWrapper.unload     Waiting for 1 instance(s) to be deallocated for Servlet [DirectoryAssistance]
29-Oct-2014 16:28:02.102 WARNING [localhost-startStop-2]     org.apache.catalina.loader.WebappClassLoader.clearReferencesThreads The web application     [/SecureAutoData1] appears to have started a thread named [Abandoned connection cleanup thread] but     has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(Unknown Source)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:41)
29-Oct-2014 16:28:02.103 WARNING [localhost-startStop-2]     org.apache.catalina.loader.WebappClassLoader.clearReferencesThreads The web application     [/SecureAutoData1] 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. Stack trace of request processing         thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.park(Unknown Source)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
 org.apache.tomcat.dbcp.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:523)
 org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
 org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:358)
 org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:118)
 org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1412)
 com.secureautodata.business.data.DBConnector.getConnection(DBConnector.java:47)
 com.secureautodata.business.data.LeadFactory.fetchAdminLeads(LeadFactory.java:49)
 com.secureautodata.control.DirectoryAssistance.doPost(DirectoryAssistance.java:668)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
     org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
 org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
 org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655)
         org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:22    2)
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 java.lang.Thread.run(Unknown Source)
29-Oct-2014 16:28:02.105 WARNING [localhost-startStop-2]     org.apache.catalina.loader.WebappClassLoader.clearReferencesThreads The web application     [/SecureAutoData1] is still processing a request that has yet to finish. This is very likely to         create a memory leak. You can control the time allowed for requests to finish by using the     unloadDelay attribute of the standard Context implementation. Stack trace of request processing     thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.park(Unknown Source)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
 org.apache.tomcat.dbcp.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:523)
 org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)
 org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:358)
 org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:118)
 org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1412)
 com.secureautodata.business.data.DBConnector.getConnection(DBConnector.java:47)
 com.secureautodata.business.data.DealerFactory.fetchDealer(DealerFactory.java:278)
 com.secureautodata.control.LoginControl.doPost(LoginControl.java:99)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
 org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
 org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655)
         org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:22    2)
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566)
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523)
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 java.lang.Thread.run(Unknown Source)
29-Oct-2014 16:28:02.119 INFO [Thread-6] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:28:02.188 INFO [Thread-6] org.apache.coyote.AbstractProtocol.stop Stopping     ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:28:16.520 INFO [main] org.apache.catalina.core.AprLifecycleListener.init The APR based     Apache Tomcat Native library which allows optimal performance in production environments was not     found on the java.library.path: C:\Tomcat     8.0\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Intel\iCLS     Client\;C:\Program Files\Intel\iCLS     Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell    \v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files     (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management     Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine     Components\IPT;C:\Program Files\Java\jdk1.8.0_11\bin;C:\Program Files (x86)\MySQL\MySQL Utilities     1.3.6\;C:\Program Files\MySQL\MySQL Server     5.6\bin;C:\wamp\bin\php\php5.5.12;C:\ProgramData\ComposerSetup\bin;C:\Maven\apache-maven-    3.2.2\bin;C:\apache-ant-1.9.4-bin\apache-ant-1.9.4\bin;C:\Python27;C:\Program Files     (x86)\scala\bin;C:\Program Files (x86)\scala\bin;;.
29-Oct-2014 16:28:16.658 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:28:16.682 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
29-Oct-2014 16:28:16.684 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:28:16.686 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
29-Oct-2014 16:28:16.686 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 344 ms
29-Oct-2014 16:28:16.703 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
29-Oct-2014 16:28:16.703 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.9
29-Oct-2014 16:28:16.718 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war
29-Oct-2014 16:28:17.281 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive C:\Tomcat 8.0\webapps\SecureAutoData1.war has finished in 562 ms
29-Oct-2014 16:28:17.281 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\docs
29-Oct-2014 16:28:17.459 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\docs has finished in 178 ms
29-Oct-2014 16:28:17.459 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\examples
29-Oct-2014 16:28:17.786 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\examples has finished in 327 ms
29-Oct-2014 16:28:17.786 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\host-manager
29-Oct-2014 16:28:17.965 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\host-manager has finished in 179 ms
29-Oct-2014 16:28:17.965 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\manager
29-Oct-2014 16:28:18.119 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\manager has finished in 154 ms
29-Oct-2014 16:28:18.119 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\Tomcat 8.0\webapps\ROOT
29-Oct-2014 16:28:18.261 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\Tomcat 8.0\webapps\ROOT has finished in 142 ms
29-Oct-2014 16:28:18.262 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-4273"]
29-Oct-2014 16:28:18.267 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
29-Oct-2014 16:28:18.268 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 1581 ms

我唯一一次看到错误是当我关闭 Web 应用程序时，因为它不会加载，我已经离开它超过 15 分钟，然后回到计算机上看到本地主机上的等待仍然坐在相同的底部我走开时的屏幕。

对于在日志中包含所有文件中的所有信息，我深表歉意，但我想彻底。我注意到它在谈论并发锁定错误，但除了我的连接池和服务器本身正在运行的任何线程之外，我不相信我已经编写了任何其他线程，或者这可能是问题所在。我不是很确定，我希望你们能帮助我。提前致谢！

好的，所以我认为答案肯定是连接池连接没有被释放，我急于完成项目的下一部分，忘记在我的几个数据类中添加我的发布和关闭语句，但是，我返回并添加了发布声明，然后运行了我的项目，我收到了这个错误：

Oct 29, 2014 9:40:10 PM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.util.ServiceConfigurationError: javax.xml.parsers.SAXParserFactory: Provider         org.apache.xerces.jaxp.SAXParserFactoryImpl not found
    at java.util.ServiceLoader.fail(Unknown Source)
    at java.util.ServiceLoader.access$300(Unknown Source)
    at java.util.ServiceLoader$LazyIterator.nextService(Unknown Source)
    at java.util.ServiceLoader$LazyIterator.next(Unknown Source)
    at java.util.ServiceLoader$1.next(Unknown Source)
    at javax.xml.parsers.FactoryFinder$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.xml.parsers.FactoryFinder.findServiceProvider(Unknown Source)
    at javax.xml.parsers.FactoryFinder.find(Unknown Source)
    at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
    at org.apache.taglibs.standard.tlv.JstlBaseTLV.validate(JstlBaseTLV.java:161)
    at org.apache.taglibs.standard.tlv.JstlCoreTLV.validate(JstlCoreTLV.java:105)
    at org.apache.jasper.compiler.TagLibraryInfoImpl.validate(TagLibraryInfoImpl.java:378)
    at org.apache.jasper.compiler.Validator.validateXmlView(Validator.java:1883)
    at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1852)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:335)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    at         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:391)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318)
    at com.secureautodata.control.LoginControl.handler(LoginControl.java:199)
    at com.secureautodata.control.LoginControl.doPost(LoginControl.java:111)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    at         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at         org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081)

score 2 · Accepted Answer

Okay so the answer to this question was under my nose the whole time. @vanOekel presented to me that it could be a Connection pool issue where the connections were not being released. In my haste trying to tie up part of my project I had completely overlooked the closing of open connections in one of my classes.

After resolving that issue I ran into an error where my pom.xml file presented a dependency that was in conflict with a couple of .jar files that I had added to my library. The main one was the mysql connector jar, I had reinstalled tomcat on my computer at work and as a quick work around instead of including the jar in my tomcat library I just added it to my pom.xml as a dependency causing a conflict with my tomcat and IDE setup on my home computer.

After removing this dependency from the pom.xml and my jstl dependency from my pom.xml everything worked like a dream.

I have tested with several runs through and found that it no longer locks up. It seems that the connections are being released as they are supposed to be and that the site is now running properly.

score 1 · Accepted Answer

这可能对一些正在寻找类似答案但正在运行其他 JDBC 驱动程序的人有用：

我发现 postgres 驱动程序特别不友好，它不仅不会自行注销，而且还会启动某种计时器线程，该线程不会停止或响应中断（）请求，因此即使手动注销也不能直接工作并防止彻底关闭tomcat。

添加到 ServletContextListener 的 contextDestroyed 方法的以下代码对干净（-ish）关闭有很大帮助。我不得不在错误的线程上调用 stop() 但我看不到任何其他杀死它的方法。

@Override
public void contextDestroyed(ServletContextEvent sce) {
    killUnstoppableThreads();
    unregisterJdbcDrivers();
}

private void unregisterJdbcDrivers() {
    Enumeration<Driver> drivers = DriverManager.getDrivers();
    Driver d = null;
    while (drivers.hasMoreElements()) {
        try {
            d = drivers.nextElement();
            DriverManager.deregisterDriver(d);
            logger.error(String.format("Driver %s deregistered", d));

        } catch (SQLException ex) {
            logger.error(String.format("Error deregistering driver %s", d), ex);
        }
    }

}

private void killUnstoppableThreads() {
    ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean();
    ThreadInfo[] threadInfo = threadMxBean.dumpAllThreads(true, true);

    String threadName = "PostgreSQL-JDBC-SharedTimer-";
    long id = -1;
    for (ThreadInfo info : threadInfo) {
        if (info.getThreadName() != null && info.getThreadName().startsWith(threadName)) {
            id = info.getThreadId();
            for (Thread t : Thread.getAllStackTraces().keySet()) {
                if (t.getId() == id) {
                    logger.info("Killing " + info.getThreadName() + " thread");
                    t.stop(); // thread doesn't respond to interrupt()!
                    break;
                }
            }
        }
    }
}

score 0 · Accepted Answer

进行线程转储并查看是否有任何线程包含处于等待状态的应用程序代码，以防您正在寻找并发瓶颈。在 *nix 上，您可以通过发送来获取线程转储

杀死 -3

在 Windows 下，您可以发送到应用程序的窗口。线程转储到标准输出。

希望这可以帮助。

斯拉瓦

score -1 · Accepted Answer

监视 Windows 机器上的 java 进程内部发生的最简单的方法是使用 jdk 提供的 jconsole 工具。

Oracle 网站上有一个如何使用它的教程：http: //docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html

java - 为什么我的服务器停止响应并且有办法监控它？

4 回答 4

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