java.net.UnknownHostException 异常处理

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本文解决了一个在Linux环境下部署Java集群时遇到的问题，即系统无法识别特定主机名导致的异常。通过在/etc/hosts文件中添加相应的条目解决了此问题。

转自： http://blog.youkuaiyun.com/wgw335363240/article/details/7278215

在linux系统下部署Java产品的集群环境时，后台报出如下异常，系统报找不到名为“QATest242”的主机：

ERROR  - Get local host name failed -com.trs.infra.cluster.ClusterConfig.getMemberHost(ClusterConfig.java:293)
java.net.UnknownHostException: QATest242: QATest242
        at java.net.InetAddress.getLocalHost(InetAddress.java:1353)
at xxxxxxx 产品异常信息
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1029)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4013)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4357)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)
        at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)
        at org.apache.catalina.core.StandardHost.install(StandardHost.java:832)
        at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:983)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
        at org.apache.catalina.core.StandardService.start(StandardService.java:480)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)

出错的Java代码：

InetAddress localhost = InetAddress.getLocalHost();

解决办法：

打开linux机器的etc/hosts文件，在文件最后加上下面这句话，重启ekp应用即可

192.9.100.242 cluster242.domain QATest242

192.9.100.242：ip地址

cluster242.domain：第二位为域名

QATest242：主机名称