This posting describes some DNS resolver changes that one user found
they needed - something OS/distribution specific and not your OS, but
might be worth a check:
http://www.mail-archive.com/[email protected]/msg90647.html .

You're on Linux, so you might run tcpdump and see if Maven is calling
your expected DNS server.

Best
Brett

On Thu, Jul 1, 2010 at 3:50 PM, Andrew Bucknell <[email protected]> wrote:
> Thanks for the suggestion Brett but it appears that wasn’t the right fix. I
> updated to jdk 1.6.0_20. Im getting the same error in the same place.
>
> Caused by: java.net.UnknownHostException: repo1.maven.org
>
>
> -----Original Message-----
> From: Brett Randall [mailto:[email protected]]
> Sent: Thursday, 1 July 2010 11:37 AM
> To: Maven Users List
> Subject: Re: maven runtime error java.net.UnknownHostException:
> repo1.maven.org.
>
> Someone else posted similar a few weeks back with the same JDK
> version, which is pretty old:
> http://maven.40175.n5.nabble.com/Maven-in-5-minutes-doesn-t-work-tt510820.ht
> ml#a510820
>
> "Thanks for the support guys, it was not a proxy issue. I upgraded my
> JDK/JRE
> from 1.6.0_03 to 1.6.0_20 and it all came back on the track, a bit strange
> though. "
>
> I'd try updating to a current patch release of JDK 1.6.0 on you platform.
>
> Best
> Brett
>
> On Thu, Jul 1, 2010 at 11:13 AM, Andrew Bucknell <[email protected]>
> wrote:
>> I downloaded maven 2.2.1 on to my debian box and am having problems with
> it.
>> I am not using a proxy or a firewall yet I am getting the following debug
>> messages - most notably
>>
>>
>>
>> Caused by: java.net.UnknownHostException: repo1.maven.org.
>>
>>
>>
>> I am able to resolve the hostname using nslookup from the command line.
> The
>> notes I have found so far suggest such problems are typically caused by
>> proxies
>>
>> Or firewalls, but as I have neither I am stumped. Any suggestions?
>>
>>
>>
>> Andrew
>>
>>
>>
>>
>>
>> and...@melb-web:~/mvntest$ mvn -X archetype:generate
>>
>> + Error stacktraces are turned on.
>>
>> Apache Maven 2.2.1 (r801777; 2009-08-07 05:16:01+1000)
>>
>> Java version: 1.6.0_03
>>
>> Java home: /usr/local/java/jdk1.6.0_03/jre
>>
>> Default locale: en_AU, platform encoding: UTF-8
>>
>> OS name: "linux" version: "2.6.22-3-amd64" arch: "i386" Family: "unix"
>>
>> [DEBUG] Building Maven user-level plugin registry from:
>> '/home/andrew/.m2/plugin-registry.xml'
>>
>> [DEBUG] Building Maven global-level plugin registry from:
>> '/usr/local/apache/maven/conf/plugin-registry.xml'
>>
>> [INFO] Scanning for projects...
>>
>> [INFO] Searching repository for plugin with prefix: 'archetype'.
>>
>> [DEBUG] Loading plugin prefixes from group: org.apache.maven.plugins
>>
>> [INFO] org.apache.maven.plugins: checking for updates from central
>>
>> [DEBUG] Using Wagon implementation lightweight from default mapping for
>> protocol http
>>
>> [DEBUG] Checking for pre-existing User-Agent configuration.
>>
>> [DEBUG] Adding User-Agent configuration.
>>
>> [DEBUG] Connecting to repository: 'central' with url:
>> 'http://repo1.maven.org/maven2'.
>>
>> [DEBUG] Using Wagon implementation lightweight from default mapping for
>> protocol http
>>
>> [WARNING] repository metadata for: 'org.apache.maven.plugins' could not be
>> retrieved from repository: central due to an error: Error transferring
> file:
>> repo1.maven.org
>>
>> [DEBUG] Exception
>>
>> org.apache.maven.wagon.TransferFailedException: Error transferring file:
>> repo1.maven.org
>>
>>        at
>>
> org.apache.maven.wagon.providers.http.LightweightHttpWagon.fillInputData(Lig
>> htweightHttpWagon.java:143)
>>
>>        at
>> org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116)
>>
>>        at
>> org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
>>
>>        at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
>>
>>        at
>>
> org.apache.maven.artifact.manager.DefaultWagonManager.getRemoteFile(DefaultW
>> agonManager.java:546)
>>
>>        at
>>
> org.apache.maven.artifact.manager.DefaultWagonManager.getArtifactMetadata(De
>> faultWagonManager.java:443)
>>
>>        at
>>
> org.apache.maven.artifact.repository.metadata.DefaultRepositoryMetadataManag
>> er.resolve(DefaultRepositoryMetadataManager.java:97)
>>
>>        at
>>
> org.apache.maven.plugin.DefaultPluginMappingManager.loadPluginMappings(Defau
>> ltPluginMappingManager.java:103)
>>
>>        at
>>
> org.apache.maven.plugin.DefaultPluginMappingManager.loadPluginMappings(Defau
>> ltPluginMappingManager.java:87)
>>
>>        at
>>
> org.apache.maven.plugin.DefaultPluginMappingManager.getByPrefix(DefaultPlugi
>> nMappingManager.java:61)
>>
>>        at
>>
> org.apache.maven.plugin.DefaultPluginManager.getPluginDefinitionForPrefix(De
>> faultPluginManager.java:159)
>>
>>        at
>>
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor(Defaul
>> tLifecycleExecutor.java:1801)
>>
>>        at
>>
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.segmentTaskListByAggrega
>> tionNeeds(DefaultLifecycleExecutor.java:462)
>>
>>        at
>>
> org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycle
>> Executor.java:175)
>>
>>        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
>>
>>        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
>>
>>        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
>>
>>        at
>> org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
>>
>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>
>>        at
>>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
>> )
>>
>>        at
>>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
>> .java:25)
>>
>>        at java.lang.reflect.Method.invoke(Method.java:597)
>>
>>        at
>> org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
>>
>>        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
>>
>>        at
>> org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
>>
>>        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
>>
>> Caused by: java.net.UnknownHostException: repo1.maven.org
>>
>>        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
>>
>>        at java.net.Socket.connect(Socket.java:519)
>>
>>        at java.net.Socket.connect(Socket.java:469)
>>
>>        at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
>>
>>        at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
>>
>>        at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
>>
>>        at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
>>
>>        at sun.net.www.http.HttpClient.New(HttpClient.java:306)
>>
>>        at sun.net.www.http.HttpClient.New(HttpClient.java:323)
>>
>>        at
>>
> sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnecti
>> on.java:788)
>>
>>        at
>>
> sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.j
>> ava:729)
>>
>>        at
>>
> sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:6
>> 54)
>>
>>        at
>>
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection
>> .java:977)
>>
>>        at
>> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:373)
>>
>>        at
>>
> org.apache.maven.wagon.providers.http.LightweightHttpWagon.fillInputData(Lig
>> htweightHttpWagon.java:115)
>>
>>        ... 25 more
>>
>> [INFO] Repository 'central' will be blacklisted
>>
>>
>>
>> and...@melb-web:~/mvntest$ nslookup repo1.maven.org
>>
>> Server:         203.12.160.35
>>
>> Address:        203.12.160.35#53
>>
>>
>>
>> Non-authoritative answer:
>>
>> Name:   repo1.maven.org
>>
>> Address: 38.97.124.18
>>
>>
>
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