Hi,
When I try to build carbon dependencies, I get the following error.

[FATAL ERROR] Container realm = plexus.core
urls[0] = file:/usr/local/maven/maven-2.1.0/lib/maven-2.1.0-uber.jar
urls[1] =
file:/home/azeez/.m2/repository/org/apache/maven/archetype/archetype-packaging/2.0-alpha-4/archetype-packaging-2.0-alpha-4.jar
urls[2] =
file:/home/azeez/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
[INFO]
------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO]
------------------------------------------------------------------------
[INFO] loader constraint violation: loader (instance of
org/codehaus/classworlds/RealmClassLoader) previously initiated loading for
a different type with name "org/codehaus/plexus/util/xml/XMLWriter"
[INFO]
------------------------------------------------------------------------
[INFO] Trace
java.lang.LinkageError: loader constraint violation: loader (instance of
org/codehaus/classworlds/RealmClassLoader) previously initiated loading for
a different type with name "org/codehaus/plexus/util/xml/XMLWriter"
 at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
 at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
 at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
 at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at
org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195)
 at
org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255)
at
org.codehaus.classworlds.RealmClassLoader.loadClass(RealmClassLoader.java:214)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 at
org.apache.felix.ipojo.junit4osgi.plugin.XMLReport.generateReport(XMLReport.java:194)
at
org.apache.felix.ipojo.junit4osgi.plugin.Junit4osgiPlugin.executeTest(Junit4osgiPlugin.java:573)
 at
org.apache.felix.ipojo.junit4osgi.plugin.Junit4osgiPlugin.invokeRun(Junit4osgiPlugin.java:447)
at
org.apache.felix.ipojo.junit4osgi.plugin.Junit4osgiPlugin.execute(Junit4osgiPlugin.java:253)
 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.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:540)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:519)
 at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371)
at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:332)
 at
org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
 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)
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 14 minutes 16 seconds
[INFO] Finished at: Wed Feb 24 21:14:44 IST 2010
[INFO] Final Memory: 388M/907M


Any idea on how I can overcome this?

-- 
Afkham Azeez
Software Architect & Product Manager, WSO2 WSAS; WSO2, Inc.; http://wso2.com
Member; Apache Software Foundation; http://www.apache.org/
email: [email protected] cell: +94 77 3320919
blog: http://afkham.org
twitter: http://twitter.com/afkham_azeez
linked-in: http://lk.linkedin.com/in/afkhamazeez
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