Apache usergrid tomcat错误

Question

我正在尝试在我的本地主机上部署apache usergrid堆栈。我将ROOT.war放在/vat/lib/tomcat7/webapps中。在重启tomcat之后，当我访问http://localhost:8080时，我没有得到任何响应。当我检查tomcat的日志时，我在localhost日志中得到以下错误。

    Mar 19, 2016 5:51:10 AM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
Mar 19, 2016 5:51:10 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class org.apache.usergrid.rest.ShutdownListener
java.lang.UnsupportedClassVersionError: org/apache/usergrid/rest/ShutdownListener : Unsupported major.minor version 52.0 (unable to load class org.apache.usergrid.rest.ShutdownListener)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2948)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1208)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:529)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:511)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:139)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4888)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073)
    at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:701)
Mar 19, 2016 5:51:10 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Skipped installing application listeners due to previous error(s)

如果任何人有解决方案，请帮助。

Answer 1

UnsupportedClassVersionError异常通常意味着您正在尝试运行一些为较新版本的Java语言编译的代码，这些代码是在旧版本的Java语言上编译的。

Usergrid 2需要Java 8，因此请确保您使用的是Java 8 JDK。

有关要求和说明，请参阅用户网格部署指南：https://usergrid.apache.org/docs/installation/deployment-guide.html