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几个月前，我在CENTOS 6.8服务器上安装了Jenkins v.2.6，并且自上周以来所有工作都按预期工作，只是停止工作。詹金斯不工作，无法登录，卡住然后超时
如果我去http://mydomain:8081，登录页面不会再加载，并给我HTTP 503错误HTTP错误：503访问/登录问题。原因：服务不可用。
我检查端口8081，它仍在监听，检查Jenkins服务的状态，它使用指定的PID＃正常运行。
我没有检查Jenkins日志，看到下面的消息，我不知道如何修复它，试着在Jenkins配置文件中添加--prefix/Jenkins作为参数和127.0.0.1，就像其他线程建议的一样，但没有一个工作。
即使重新启动服务器，仍然无法正常工作。
任何人都可以帮忙吗？
感谢，
詹金斯日志文件
Running from: /usr/lib/jenkins/jenkins.war
Apr 17, 2017 3:10:21 PM Main deleteWinstoneTempContents
WARNING: Failed to delete the temporary Winstone file /tmp/winstone/jenkins.war
Apr 17, 2017 3:10:22 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Logging initialized @1304ms
Apr 17, 2017 3:10:22 PM winstone.Logger logInternal
INFO: Beginning extraction from war file
Apr 17, 2017 3:10:22 PM org.eclipse.jetty.util.log.JavaUtilLog warn
WARNING: Empty contextPath
Apr 17, 2017 3:10:22 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: jetty-9.2.z-SNAPSHOT
Apr 17, 2017 3:10:24 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
Apr 17, 2017 3:10:25 PM org.eclipse.jetty.util.log.JavaUtilLog warn
WARNING: Failed startup of context [email protected]{/,file:/var/cache/jenkins/war/,STARTING}{/var/cache/jenkins/war}
java.lang.reflect.InvocationTargetException
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.eclipse.jetty.webapp.IterativeDescriptorProcessor.visit(IterativeDescriptorProcessor.java:85)
at org.eclipse.jetty.webapp.IterativeDescriptorProcessor.process(IterativeDescriptorProcessor.java:72)
at org.eclipse.jetty.webapp.MetaData.resolve(MetaData.java:408)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1340)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
at org.eclipse.jetty.server.Server.start(Server.java:387)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
at org.eclipse.jetty.server.Server.doStart(Server.java:354)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at winstone.Launcher.<init>(Launcher.java:152)
at winstone.Launcher.main(Launcher.java:352)
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 Main._main(Main.java:264)
at Main.main(Main.java:112)
Caused by: java.lang.UnsupportedClassVersionError: jenkins/util/SystemProperties : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at org.eclipse.jetty.webapp.WebAppClassLoader.findClass(WebAppClassLoader.java:510)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:441)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:403)
at org.eclipse.jetty.server.handler.ContextHandler.loadClass(ContextHandler.java:1583)
at org.eclipse.jetty.webapp.StandardDescriptorProcessor.visitListener(StandardDescriptorProcessor.java:1956)
... 25 more
Apr 17, 2017 3:10:25 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Started [email protected]{HTTP/1.1}{0.0.0.0:8081}
Apr 17, 2017 3:10:25 PM org.eclipse.jetty.util.log.JavaUtilLog info
安装JDK 1.8的所有工作正常后几个小时，所有突然我得到了超时没有任何HTTP错误消息这一次。
我再次检查了JENKINS日志，这是它这次显示的内容。
Running from: /usr/lib/jenkins/jenkins.war
Apr 18, 2017 8:53:27 PM Main deleteWinstoneTempContents
WARNING: Failed to delete the temporary Winstone file /tmp/winstone/jenkins.war
Apr 18, 2017 8:53:27 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Logging initialized @861ms
Apr 18, 2017 8:53:27 PM winstone.Logger logInternal
INFO: Beginning extraction from war file
Apr 18, 2017 8:53:27 PM org.eclipse.jetty.util.log.JavaUtilLog warn
WARNING: Empty contextPath
Apr 18, 2017 8:53:27 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: jetty-9.2.z-SNAPSHOT
Apr 18, 2017 8:53:28 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
Jenkins home directory: /data/jenkins found at: SystemProperties.getProperty("JENKINS_HOME")
Apr 18, 2017 8:53:29 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Started [email protected]{/,file:/var/cache/jenkins/war/,AVAILABLE}{/var/cache/jenkins/war}
Apr 18, 2017 8:53:29 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Started [email protected]{HTTP/1.1}{0.0.0.0:8081}
Apr 18, 2017 8:53:29 PM org.eclipse.jetty.util.log.JavaUtilLog info
INFO: Started @2826ms
Apr 18, 2017 8:53:29 PM winstone.Logger logInternal
INFO: Winstone Servlet Engine v2.0 running: controlPort=disabled
Apr 18, 2017 8:53:30 PM jenkins.InitReactorRunner$1 onAttained
INFO: Started initialization
Apr 18, 2017 8:53:30 PM jenkins.InitReactorRunner$1 onAttained
INFO: Listed all plugins
Apr 18, 2017 8:53:30 PM jenkins.bouncycastle.api.SecurityProviderInitializer addSecurityProvider
INFO: Initializing Bouncy Castle security provider.
Apr 18, 2017 8:53:30 PM jenkins.bouncycastle.api.SecurityProviderInitializer addSecurityProvider
INFO: Bouncy Castle security provider initialized.
Apr 18, 2017 8:53:38 PM jenkins.InitReactorRunner$1 onAttained
INFO: Prepared all plugins
Apr 18, 2017 8:53:38 PM jenkins.InitReactorRunner$1 onAttained
INFO: Started all plugins
Apr 18, 2017 8:53:40 PM hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1 error
INFO: Failed to instantiate optional component hudson.plugins.build_timeout.operations.AbortAndRestartOperation$DescriptorImpl; skipping
Apr 18, 2017 8:53:40 PM org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl <init>
WARNING: Docker URL is not set, docker client won't be initialized
Apr 18, 2017 8:53:41 PM jenkins.InitReactorRunner$1 onAttained
INFO: Augmented all extensions
Apr 18, 2017 8:53:42 PM jenkins.InitReactorRunner$1 onAttained
INFO: Loaded all jobs
Apr 18, 2017 8:53:42 PM hudson.model.AsyncPeriodicWork$1 run
INFO: Started Download metadata
任何人都可以帮助我吗？正如我所说的，在将JDK升级到1.8并且在几个小时内创建了10多个版本之后，它就可以工作，然后再次停止工作。
谢谢，
https://issues.jenkins-ci.org/browse/JENKINS-43492。这似乎是一个实时问题。检查最后2条评论 - 看起来应该已经修复（或即将推出）。 – Aaron
'UnsupportedClassVersionError'几乎肯定意味着安装的二进制文件与Java VM的版本不匹配。所以请确保您安装了正确的Java版本。 –
正如我所说，谢谢，我已经这么做了，除非它自动更新到新版本，并且需要更新版本的VM？它现在在java版本“1.7.0_51”上。我如何检查Jenkins版本？ –