按教程下载了jenkins.war 文件，然后用 java -jar jenkins.war ，启动报错
用的jdk7
警告: Failed startup of context w.@58342475{/,file:/C:/Users/admin/.jenkins/war/,STARTING}{C:\Users\admin\.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 [0m七月 10, 2017 4:46:44 下午 org.eclipse.jetty.util.log.JavaUtilLog info 信息: Started ServerConnector@37bc2b18{HTTP/1.1}{0.0.0.0:8080} 七月 10, 2017 4:46:44 下午 org.eclipse.jetty.util.log.JavaUtilLog info 信息: Started @1037ms 七月 10, 2017 4:46:44 下午 winstone.Logger logInternal 信息: Winstone Servlet Engine v2.0 running: controlPort=disabled
有传言说说因为Jdk 版本问题，搜到的帖子：http://www.cnblogs.com/xing901022/p/4172410.html
1 J2SE 7 = 51 (0x33 hex), 2 J2SE 6.0 = 50 (0x32 hex), 3 J2SE 5.0 = 49 (0x31 hex), 4 JDK 1.4 = 48 (0x30 hex), 5 JDK 1.3 = 47 (0x2F hex), 6 JDK 1.2 = 46 (0x2E hex), 7 JDK 1.1 = 45 (0x2D hex).
然后换了jdk8, 果然问题就好了，
