基本信息

weblogic：10.3.6

jdk：1.7，64位

kafka：0.10.0.1

zookeeper：3.4.6

搭建虚拟机，部署kafka消费客户端

错误信息

虚拟机搭建完成后，部署应用，启动应用，报错如下

<Jul 19, 2019 11:19:24 AM CST> <Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. Reason: java.lang.AssertionError: Could not obtain the localhost address. The most likely cause is an error in the network configuration of this machine.
java.lang.AssertionError: Could not obtain the localhost address. The most likely cause is an error in the network configuration of this machine.
        at weblogic.server.channels.AddressUtils$AddressMaker.getLocalHost(AddressUtils.java:38)
        at weblogic.server.channels.AddressUtils$AddressMaker.<clinit>(AddressUtils.java:33)
        at weblogic.server.channels.AddressUtils.getIPAny(AddressUtils.java:154)
        at weblogic.protocol.configuration.ChannelHelper.checkConsistency(ChannelHelper.java:61)
        at weblogic.server.channels.ChannelService.start(ChannelService.java:207)
        Truncated. see log file for complete stacktrace
Caused By: java.net.UnknownHostException: kafkaxf1: kafkaxf1: Temporary failure in name resolution
        at java.net.InetAddress.getLocalHost(InetAddress.java:1475)
        at weblogic.server.channels.AddressUtils$AddressMaker.getLocalHost(AddressUtils.java:36)
        at weblogic.server.channels.AddressUtils$AddressMaker.<clinit>(AddressUtils.java:33)
        at weblogic.server.channels.AddressUtils.getIPAny(AddressUtils.java:154)
        at weblogic.protocol.configuration.ChannelHelper.checkConsistency(ChannelHelper.java:61)
        Truncated. see log file for complete stacktrace
Caused By: java.net.UnknownHostException: kafkaxf1: Temporary failure in name resolution
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1295)
        at java.net.InetAddress.getLocalHost(InetAddress.java:1471)
        at weblogic.server.channels.AddressUtils$AddressMaker.getLocalHost(AddressUtils.java:36)
        Truncated. see log file for complete stacktrace

问题原因

 根据错误信息java.net.UnknownHostException: kafkaxf1: Temporary failure in name resolution，考虑是配置的机器hostname无法解析，排查如下

登录服务器，执行cat /etc/sysconfig/network，查看hostname值

执行cat /etc/hosts，查看文件信息，如图所示，hostname的值要与图中蓝色框标记的值一致，否则就会出现无法解析的问题。

说明：截图中的配置信息，与本博文中的报错信息中kafkaxf1不一致，是由于当时进行问题处理时，未截图保存，截图中的信息，是在自己的虚拟机中进行错误重现时获取的。

总结

java.net.UnknownHostException: xxx: Temporary failure in name resolution，出现该类错误，基本上都是由于部署虚拟机或从其它机器克隆机器后，未及时修改/etc/sysconfig/network及/etc/hosts两个文件的配置引起的。

如果实际使用中有上述操作，记得及时将两个配置文件修改。