when I turn on the "Run Headless" option in "Build" of a maven object, it failed with following log:

Started by user lidaobing
Building on master
Cleaning up /var/lib/jenkins/jobs/Base/workspace/.
Deleting /var/lib/jenkins/jobs/Base/workspace/./target
Updating http://svn.teamhost.org/llap/trunk/phase1/sources/Base
At revision 2870
no change for http://svn.teamhost.org/llap/trunk/phase1/sources/Base since the previous build
Parsing POMs
Modules changed, recalculating dependency graph
[workspace] $ java null -Djava.awt.headless=true -cp /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven-agent-1.2.jar:/var/lib/jenkins/tools/default_maven/boot/classworlds-1.1.jar hudson.maven.agent.Main /var/lib/jenkins/tools/default_maven /var/run/jenkins/war/WEB-INF/lib/remoting-1.421.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven-interceptor-1.2.jar 39682 /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven2.1-interceptor-1.2.jar
Exception in thread "main" java.lang.NoClassDefFoundError: null
Caused by: java.lang.ClassNotFoundException: null
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: null. Program will exit.
ERROR: Failed to launch Maven. Exit code = 1
Finished: FAILURE