Hudson: trunk

When I built my projects(Free style, M2 style), I got NPE.

ERROR: Processing failed due to a bug in the code. Please report this to
users@hudson.dev.java.net
java.lang.NullPointerException
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1944)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at
hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:82)
at
hudson.remoting.MultiClassLoaderSerializer$Input.resolveProxyClass(MultiClassLoaderSerializer.java:102)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at
hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:82)
at
hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:94)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:168)
at hudson.remoting.UserRequest.perform(UserRequest.java:88)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:236)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
project=hudson.maven.MavenModuleSet@1a5049a[Hudson]
project.getModules()=[hudson.maven.MavenModule@feaf9c[Hudson/org.jvnet.hudson.main:cli],
hudson.maven.MavenModule@1c506f7[Hudson/org.jvnet.hudson.main:hudson-core],
hudson.maven.MavenModule@9c8a10[Hudson/org.jvnet.hudson.main:hudson-test-harness],
hudson.maven.MavenModule@854dc9[Hudson/org.jvnet.hudson.main:hudson-war],
hudson.maven.MavenModule@119b8ae[Hudson/org.jvnet.hudson.main:maven-agent],
hudson.maven.MavenModule@633079[Hudson/org.jvnet.hudson.main:maven-interceptor],
hudson.maven.MavenModule@5855bd[Hudson/org.jvnet.hudson.main:maven-plugin],
hudson.maven.MavenModule@15d060d[Hudson/org.jvnet.hudson.main:pom],
hudson.maven.MavenModule@1e219e7[Hudson/org.jvnet.hudson.main:remoting]]
project.getRootModule()=hudson.maven.MavenModule@15d060d[Hudson/org.jvnet.hudson.main:pom]
FATAL: null
java.lang.NullPointerException
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1944)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at
hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:82)
at
hudson.remoting.MultiClassLoaderSerializer$Input.resolveProxyClass(MultiClassLoaderSerializer.java:102)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at
hudson.remoting.MultiClassLoaderSerializer$Input.readClassLoader(MultiClassLoaderSerializer.java:82)
at
hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:94)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:168)
at hudson.remoting.UserRequest.perform(UserRequest.java:88)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:236)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)