java - 为什么 Tomcat 8.5 重新加载上下文

Question

似乎自从我们将 tomcat 升级到版本 8+ 后，我们就在启动时重新加载了上下文。然而，它似乎只发生在我们的开发环境中(带有 eclipse 和 tomcat 8.5 的 Windows 操作系统)。我们的生产环境(带有 tomcat 8.5 的 Linux 操作系统)没有这个问题。我会在下面发布它，但我没有从 tomcat 日志中看到任何迹象表明为什么会发生这种情况。我知道这通常是网络应用程序目录中的某些内容发生更改的行为，但是对于我的生活，我无法弄清楚它在做什么。不过一定有办法追踪它。

这第一 block 日志是完全开始的

Feb 18, 2017 9:53:41 AM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Stackoverflow-commproxy' did not find a matching property. Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Server version: Apache Tomcat/8.5.11 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Server built: Jan 10 2017 21:02:52 UTC Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Server number: 8.5.11.0 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: OS Name: Windows 10 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: OS Version: 10.0 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Architecture: amd64 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Java Home: C:\Program Files\Java\jdk1.8.0_91\jre Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Version: 1.8.0_91-b14 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Vendor: Oracle Corporation Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_BASE: C:\CodeRepos\work\EclipseWorkspace.metadata.plugins\org.eclipse.wst.server.core\tmp0 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_HOME: C:\tomcat\apache-tomcat-8.5.11 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.base=C:\CodeRepos\work\EclipseWorkspace.metadata.plugins\org.eclipse.wst.server.core\tmp0 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.home=C:\tomcat\apache-tomcat-8.5.11 Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dwtp.deploy=C:\CodeRepos\work\EclipseWorkspace.metadata.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Djava.endorsed.dirs=C:\tomcat\apache-tomcat-8.5.11\endorsed Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dfile.encoding=Cp1252 Feb 18, 2017 9:53:41 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.8.0_91\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_121/bin/server;C:/Program Files/Java/jre1.8.0_121/bin;C:/Program Files/Java/jre1.8.0_121/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Python27\;C:\Python27\Scripts;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 (x86)\GtkSharp\2.12\bin;C:\Users\dever.dnx\bin;C:\Program Files\Microsoft DNX\Dnvm\;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\;c:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\;c:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\;c:\Program Files\Microsoft SQL Server\110\Tools\Binn\;c:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Windows Live\Shared;C:\WINDOWS\system32\config\systemprofile.dnx\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Microsoft Emulator Manager\1.0\;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Program Files\Emscripten\emscripten\1.35.0;C:\Program Files\Emscripten;C:\Program Files\Emscripten\clang\e1.35.0_64bit;C:\Program Files\Emscripten\node\0.12.2_64bit;C:\Program Files\Emscripten\python\2.7.5.3_64bit;C:\Program Files\Emscripten\java\7.45_64bit\bin;C:\Program Files\Emscripten\crunch\1.03;C:\Program Files\Emscripten\mingw\4.6.2_32bit;C:\Program Files\TortoiseSVN\bin;C:\JavaProgramFiles\jdk1.8.0_91\bin;C:\Ruby193\bin;C:\program files\apache-maven-3.3.9\bin;c:\Program Files\MongoDB\Server\3.2\bin;C:\JavaProgramFiles\apache-ant-1.9.7\bin;C:\JavaProgramFiles\xmlbeans-1.0.3\bin;C:\Users\dever\AppData\Local\Microsoft\WindowsApps;C:\Users\dever\AppData\Roaming\npm;C:\Program Files\eclipse\jee-neon\eclipse;;. Feb 18, 2017 9:53:41 AM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["http-nio-8080"] Feb 18, 2017 9:53:41 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector INFO: Using a shared selector for servlet write/read Feb 18, 2017 9:53:41 AM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["ajp-nio-8009"] Feb 18, 2017 9:53:41 AM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector INFO: Using a shared selector for servlet write/read Feb 18, 2017 9:53:41 AM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 610 ms Feb 18, 2017 9:53:41 AM org.apache.catalina.core.StandardService startInternal INFO: Starting service Catalina Feb 18, 2017 9:53:41 AM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/8.5.11 Feb 18, 2017 9:53:44 AM org.apache.jasper.servlet.TldScanner scanJars INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. Feb 18, 2017 9:53:44 AM org.apache.catalina.core.ApplicationContext log INFO: No Spring WebApplicationInitializer types detected on classpath Feb 18, 2017 9:53:44 AM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext 2017-02-18 09:53:45.755 [localhost-startStop-1] INFO com.stackoverflow.util.common.AppConfigPostProcessor - Setting system property: org.jboss.logging.provider=slf4j 2017-02-18 09:53:45.757 [localhost-startStop-1] INFO com.stackoverflow.util.common.AppConfigPostProcessor - Setting default timezone to: UTC 2017-02-18 09:53:47.990 [localhost-startStop-1] INFO com.stackoverflow.util.concurrent.ThreadPoolTaskScheduler - Initializing ExecutorService 'taskScheduler' 2017-02-18 09:53:47.997 [localhost-startStop-1] INFO com.stackoverflow.service.commproxy.LoggingServiceImpl - Logging Service: init successfully 2017-02-18 09:53:48.011 [localhost-startStop-1] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: initializing Stackoverflow Device Service... 2017-02-18 09:53:48.314 [localhost-startStop-1] INFO com.stackoverflow.cache.mapdb.MapDBCacheManager - Opened StackoverflowCommProxyCacheV4 MapDB store. File location C:\Users\dever\AppData\Local\Temp\StackoverflowCommProxyCacheV4.DeviceMetaDataCache 2017-02-18 09:53:48.314 [localhost-startStop-1] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: loading local DeviceMetaData cache 2017-02-18 09:53:48.316 [taskScheduler-1] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: starting device pool refresh task Feb 18, 2017 5:53:48 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler [http-nio-8080] Feb 18, 2017 5:53:48 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler [ajp-nio-8009] Feb 18, 2017 5:53:48 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 6928 ms 2017-02-18 09:53:49.774 [taskScheduler-1] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: received list of device metadata with 15 items from Stackoverflow Cloud Services 2017-02-18 09:53:49.775 [taskScheduler-1] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: device metadata cache contains 15 items 2017-02-18 09:53:49.806 [taskScheduler-1] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: performed refresh cycle. Time spent: 1490 ms Feb 18, 2017 5:53:58 PM org.apache.catalina.core.StandardContext reload INFO: Reloading Context with name [/stackoverflow-commproxy] has started

请注意没有错误，并且发生的任何操作都不会触及磁盘。日志记录略有异常(exception)。它确实记录到文件，但是使用我们这样的设置它真的不应该触及网络应用程序目录:

log4j2.xml

    <?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorInterval="180">
    <Properties>
        <!-- change the path to conference logs below to fit your system -->
        <Property name="LOG_DIR">C:\CodeRepos\logs\</Property>

以及日志文件的其余部分:

Feb 18, 2017 5:53:58 PM org.apache.catalina.core.ApplicationContext log INFO: Closing Spring root WebApplicationContext 2017-02-18 09:53:58.514 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: destroying Stackoverflow Device Service... 2017-02-18 09:53:58.543 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.cache.mapdb.MapDBCacheManager - Closed StackoverflowCommProxyCacheV4.DeviceMetaDataCache MapDB store 2017-02-18 09:53:58.545 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.util.concurrent.ThreadPoolTaskScheduler - Shutting down ExecutorService 'taskScheduler' Feb 18, 2017 5:53:58 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads WARNING: The web application [Stackoverflow-commproxy] appears to have started a thread named [Log4j2-Log4j2Scheduled-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) java.lang.Thread.run(Thread.java:745) Feb 18, 2017 5:54:00 PM org.apache.jasper.servlet.TldScanner scanJars INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. Feb 18, 2017 5:54:00 PM org.apache.catalina.core.ApplicationContext log INFO: No Spring WebApplicationInitializer types detected on classpath Feb 18, 2017 5:54:00 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext 2017-02-18 17:54:01.637 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.util.common.AppConfigPostProcessor - Setting system property: org.jboss.logging.provider=slf4j 2017-02-18 17:54:01.639 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.util.common.AppConfigPostProcessor - Setting default timezone to: UTC 2017-02-18 17:54:03.732 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.util.concurrent.ThreadPoolTaskScheduler - Initializing ExecutorService 'taskScheduler' 2017-02-18 17:54:03.739 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.service.commproxy.LoggingServiceImpl - Logging Service: init successfully 2017-02-18 17:54:03.751 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: initializing Stackoverflow Device Service... 2017-02-18 17:54:04.024 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO com.stackoverflow.cache.mapdb.MapDBCacheManager - Opened StackoverflowCommProxyCacheV4 MapDB store. File location C:\Users\dever\AppData\Local\Temp\StackoverflowCommProxyCacheV4.DeviceMetaDataCache 2017-02-18 17:54:04.024 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: loading local DeviceMetaData cache 2017-02-18 17:54:04.025 [taskScheduler-1] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: starting device pool refresh task Feb 18, 2017 5:54:04 PM org.apache.catalina.core.StandardContext reload INFO: Reloading Context with name [/Stackoverflow-commproxy] is completed 2017-02-18 17:54:04.987 [taskScheduler-1] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: received list of device metadata with 15 items from Stackoverflow Cloud Services 2017-02-18 17:54:04.987 [taskScheduler-1] DEBUG com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: device metadata cache contains 15 items 2017-02-18 17:54:05.020 [taskScheduler-1] INFO com.stackoverflow.service.commproxy.DeviceServiceImpl - Device Service: performed refresh cycle. Time spent: 995

我们可以看到有关 log4j 启​​动且无法停止的某些线程的错误，但除了没有指示导致上下文重新加载的原因之外，有关 log4j 的错误仅由于重新加载而发生。

如何追踪上下文重新加载的原因。我们有几个项目因这个问题而受苦，有些项目似乎比特定的流程或类更具全局性。

还没有收到任何答案，所以我只想重申一个事实，即我真的在寻找解决此问题的下一步？要查看的其他日志或找出触发上下文重新加载的某种方式

Answer 1

您可以尝试以下设置:

从 Eclipse Servers View 打开您的服务器配置

然后确保在此编辑器中的服务器选项部分“默认情况下自动重新加载模块”未选中

还要确保在编辑器发布部分选择“从不自动发布”

在 Eclipse 服务器 View 中打开服务器的上下文菜单

选择“添加和删除...”

在对话框中确保“如果服务器已启动，立即发布更改”未选中并完成(您可能还必须先删除所有 web 应用程序并在另一个步骤中再次添加它们)