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Problem generating the docs

To: DHIS 2 developers <dhis2-devs@xxxxxxxxxxxxxxxxxxx>
From: Knut Staring <knutst@xxxxxxxxx>
Date: Mon, 14 Sep 2009 15:01:09 +0200

Hi, got maven to work over proxy, but still facing a strange problem:

$ mvn docbook:transform
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'docbook'.
[INFO]
------------------------------------------------------------------------
[INFO] Building DHIS2 Documentation system
[INFO]    task-segment: [docbook:transform]
[INFO]
------------------------------------------------------------------------
[INFO] [docbook:transform]
[INFO]
------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
------------------------------------------------------------------------
[INFO] null
[INFO]
------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
        at java.util.Hashtable.put(Hashtable.java:394)
        at java.util.Properties.setProperty(Properties.java:143)
        at java.lang.System.setProperty(System.java:731)
        at
org.codehaus.mojo.docbook.TransformMojo.execute(TransformMojo.java:130)
        at
org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:553)
        at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:523)