A strange UnknownHostException
dns, ipv6, java
Solution
i have had the same exception and solved it by setting my hostname manually in /etc/hosts for the 'localhost' entry both.
127.0.0.1 localhost DL006285-linux
# special IPv6 addresses
::1 localhost ipv6-localhost ipv6-loopback DL006285-linux
Problem
In a web project . I see the log: ``` hadoop.hbase.zookeeper.ZKConfig - java.net.UnknownHostException: example.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:850) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1201) at java.net.InetAddress.getAllByName0(InetAddress.java:1154) at java.net.InetAddress.getAllByName(InetAddress.java:1084) at java.net.InetAddress.getAllByName(InetAddress.java:1020) at java.net.InetAddress.getByName(InetAddress.java:970) ``` but when I ping example.com, it's ok, I also telnet example.com 2181 successfully! I found the similar question so I run the DomainResolutionTest in my Server java DomainResolutionTest example.com but it's ok ! env: ``` java -version ``` java version "1.6.0_25" Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) 64-Bit Server VM (build 20.0-b11, mixed mode) `os:Red Hat Enterprise Linux Server release 5.7` I am curious why is Inet6AddressImpl,I think it may be Inet4AddressImpl How to solve it? What's the cause ?