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PODomain name resolution not working in Java Applications on Ubuntu64 9.04 machine. All other software resolves DNS correctly
 

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  1. PODomain name resolution not working in Java Applications on Ubuntu64 9.04 machine. All other software resolves DNS correctly
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    <p>I have an number of Java applications installed on an Ubuntu64 9.04 PC, and none of them can resolve domain names (there are multiple JRE's too - some of them are IBM products). If I put the domain name in the hosts file with it's associated IP address, then the Java apps work for those domains only. Every other non Java program - like ping, firefox, etc - work just fine with domain resolution. I've tried to disable DNS caching in the java.security file - for all of my JREs - but that didn't work either. I would appreciate some help in figuring this one out. Thanks!</p> <hr> <p>UPDATE: I am sure there isn't a proxy server in my home or office. - I appreciate you guys helping me here. I REALLY want to use Linux instead of windows now that I'm doing Java development again.</p> <pre><code>jgreenwood@jeg-ubuntu64:~$ cat /etc/resolv.conf # Generated by NetworkManager domain hsd1.in.comcast.net. search hsd1.in.comcast.net. nameserver 192.168.0.1 jgreenwood@jeg-ubuntu64:~$ env | grep -i proxy jgreenwood@jeg-ubuntu64:~$ dig google.com ; &lt;&lt;&gt;&gt; DiG 9.5.1-P2 &lt;&lt;&gt;&gt; google.com ;; global options: printcmd ;; Got answer: ;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 56845 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;google.com. IN A ;; ANSWER SECTION: google.com. 58 IN A 74.125.53.100 google.com. 58 IN A 74.125.45.100 google.com. 58 IN A 74.125.67.100 ;; Query time: 35 msec ;; SERVER: 192.168.0.1#53(192.168.0.1) ;; WHEN: Thu Oct 22 13:37:26 2009 ;; MSG SIZE rcvd: 76 </code></pre> <hr> <p>UPDATE: I wrote this java program in RAD:</p> <pre><code>import java.net.InetAddress; import java.net.UnknownHostException; import java.io.PrintWriter; import java.io.StringWriter; public class DomainResolutionTest { public static void main(String[] args) { if (args.length == 0) args = new String[] { "www.google.com" }; try { InetAddress ip = InetAddress.getByName(args[0]); System.out.println(ip.toString()); }catch (UnknownHostException uhx) { System.out.println("ERROR: " + uhx.getMessage() + "\n" + getStackTrace(uhx)); Throwable cause = uhx.getCause(); if (cause != null) System.out.println("CAUSE: " + cause.getMessage()); } } public static String getStackTrace(Throwable t) { StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw, true); t.printStackTrace(pw); pw.flush(); sw.flush(); return sw.toString(); } } </code></pre> <p>The output is:</p> <pre><code>ERROR: www.google.com java.net.UnknownHostException: www.google.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:862) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1213) at java.net.InetAddress.getAllByName0(InetAddress.java:1166) at java.net.InetAddress.getAllByName(InetAddress.java:1096) at java.net.InetAddress.getAllByName(InetAddress.java:1032) at java.net.InetAddress.getByName(InetAddress.java:982) at DomainResolutionTest.main(DomainResolutionTest.java:12) </code></pre> <hr> <p>From the command line: (same result)</p> <pre><code>jgreenwood@jeg-ubuntu64:~$ javac DomainResolutionTest.java jgreenwood@jeg-ubuntu64:~$ java DomainResolutionTest ERROR: www.google.com java.net.UnknownHostException: www.google.com at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849) at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200) at java.net.InetAddress.getAllByName0(InetAddress.java:1153) at java.net.InetAddress.getAllByName(InetAddress.java:1083) at java.net.InetAddress.getAllByName(InetAddress.java:1019) at java.net.InetAddress.getByName(InetAddress.java:969) at DomainResolutionTest.main(DomainResolutionTest.java:12) jgreenwood@jeg-ubuntu64:~$ java -version java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode) jgreenwood@jeg-ubuntu64:~$ </code></pre>
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    1. COWhat is the error? Are you making an explicit DNS query or just trying to make a connection to a machine by name? I think your problem must be environmental or program-specific because I have no such problem on 64-bit Ubuntu 9.04.
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      1. USRob H
    2. COI have IBM Rational Application Developer, and Oracle SQL Developer loaded. Both use a different JVM. However, both of them will not resololve DNS names. In RAD, which is basically Eclipse, you use URLs to update the product from the web. None of them resolve. At the same time though, I can put the URL in Firefox and the website pops right up! In oracle SQL developer, I have the same problem. There is a server on our network with Oracle DB running on it. I can ping the domain name just fine from the command line. However, I can only connect to that database through the IP address. INSANITY!
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      1. USkomma8.komma1
    3. COHave you tried using InetAddress.getByName? Do you have a proxy set up in Firefox? Can you retrieve pages from the server using wget or curl?
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      1. PODomain name resolution not working in Java Applications on Ubuntu64 9.04 machine. All other software resolves DNS correctly
      1. USLaurence Gonsalves
 

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