java.net.UnknownHostException 异常处理

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-Getlocalhostnamefailed-com.trs.infra.cluster.ClusterConfig.getMemberHost(ClusterConfig.java:293)

java.net.UnknownHostException:QATest242:QATest242

atjava.net.InetAddress.getLocalHost(InetAddress.java:1353)

atxxxxxxx产品异常信息

atorg.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1029)

atorg.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)

atorg.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4013)

atorg.apache.catalina.core.StandardContext.start(StandardContext.java:4357)

atorg.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:823)

atorg.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)

atorg.apache.catalina.core.StandardHost.addChild(StandardHost.java:595)

atorg.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:277)

atorg.apache.catalina.core.StandardHost.install(StandardHost.java:832)

atorg.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:701)

atorg.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:432)

atorg.apache.catalina.startup.HostConfig.start(HostConfig.java:983)

atorg.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:349)

atorg.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)

atorg.apache.catalina.core.ContainerBase.start(ContainerBase.java:1091)

atorg.apache.catalina.core.StandardHost.start(StandardHost.java:789)

atorg.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)

atorg.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)

atorg.apache.catalina.core.StandardService.start(StandardService.java:480)

atorg.apache.catalina.core.StandardServer.start(StandardServer.java:2313)

atorg.apache.catalina.startup.Catalina.start(Catalina.java:556)

atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)

atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

atjava.lang.reflect.Method.invoke(Method.java:597)

atorg.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)

atorg.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)

出错的Java代码：

InetAddresslocalhost=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

192.9.100.242cluster242.domainQATest242

192.9.100.242：ip地址

cluster242.domain：第二位为域名

QATest242：主机名称

------------------------------------------

测试方案：

ping127.0.0.1可以ping通

pinglocalhost不通

说明是主机映射的原因。

解决方法：

修改etc/hosts文件

[oracle@bogon~]$su-root

Password:

[root@bogon~]#cd..

[root@bogon/]#cd..

[root@bogon/]#cdetc

[root@bogonetc]#cathosts

#Donotremovethefollowingline,orvariousprograms

#thatrequirenetworkfunctionalitywillfail.

127.0.0.1bogon.localdomainbogon

在hosts文件中追加下面一行就OK了：

127.0.0.1localhost.localdomainlocalhost

61.191.39.18szxapp