Java无法从AIX解析DNS地址：UnknownHostException [英] Java cannot resolve DNS address from AIX: UnknownHostException

问题描述

在AIX上，如果我可以从命令行到达我的服务器（使用ping / telnet）

但是如果我尝试使用java，我有UnkownHostException

这是由于Java不能以某种方式使用DNS，但是不知道为什么如果我使用IP地址，它的工作正常。

这是我的测试程序。

 code> import java.net。*; 
 
 public class Test {
 public static void main（String [] args）throws Exception {
 String host = args [0]; 
 int port = Integer.parseInt（args [1]）; 
 System.out.println（连接到：+主机+在端口：+端口）; 
 Socket socket = new Socket（host，port）; 
 System.out.println（Connected！）; 
 socket.close（）; 
 System.out.println（已关闭！）; 
 
} 
} 
  

有人知道某种在AIX下配置禁止程序（如java）访问DNS信息？

我（以及系统管理员）已将我的地址添加到/ etc / hosts中，但它也不起作用。

提前感谢

Java版本：

  Java TM）2运行环境标准版（构建pap32dev-20080315（SR7））
 IBM J9 VM（构建2.3，J2RE 1.5.0 IBM J9 2.3 AIX ppc-32 j9vmap3223-20080315（启用JIT）
  

解决方案

设置系统属性

sun.net.spi.nameservice.provider.1 = dns，sun

在Ubuntu上修复了我的这个问题

I'm having this strange error.

On AIX, if I can reach my server from the command line ( using ping / telnet )

But If I try using java I've got UnkownHostException

This is due to Java cannot somehow "use" the DNS but I don't know why. If I use the IP address it works fine.

This is my test program.

    import java.net.*;

    public class Test {
            public static void main( String [] args ) throws Exception  {
                    String host = args[0];
                    int port = Integer.parseInt( args[1] );
                    System.out.println("Connecting to: " + host + " at port: " + port );
                    Socket socket = new Socket( host, port );
                    System.out.println("Connected!");
                    socket.close();
                    System.out.println("Closed!");

            }
     }

Is anyone aware of some kind of configuration under AIX that forbids programs ( like java ) to access DNS information?

I ( well the sysadm ) have added my address in /etc/hosts but it doesn't work either.

Thanks in advance

Java version:

Java(TM) 2 Runtime Environment, Standard Edition (build pap32dev-20080315 (SR7))
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 AIX ppc-32 j9vmap3223-20080315 (JIT enabled)

解决方案

Setting the System property

sun.net.spi.nameservice.provider.1=dns,sun

fixed this problem for me on Ubuntu

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