Hi Kristian,
I was also getting the following error

Exception in thread "Thread-7" java.lang.LinkageError:
org.codehaus.plexus.util.IOUtil
        at java.lang.ClassLoader.defineClassImpl(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:364)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:154)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:777)
        at java.net.URLClassLoader.access$400(URLClassLoader.java:96)
        at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1225)
        at 
java.security.AccessController.doPrivileged(AccessController.java:366)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:660)
        at
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:389)
        at
org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
        at
org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
        at
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:235)
        at
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227)
        at org.codehaus.plexus.util.cli.StreamPumper.run(StreamPumper.java:159)


I am using maven 3.1.1  and IBM JDK 1.7.1. 

I replaced 

maven-3.1.1/boot/plexus-classworlds-2.5.1.jar 

with 

maven-3.0.5/boot/plexus-classworlds-2.4.jar 

ran few builds and there are no issues.

FYI

Sachi





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