From Hudson 1.374, JDepend plugin breaks generation of "build.xml" for every build which eventually makes build unusable and it gets removed from history when hudson service is restarted/reloaded.

We use hudson to do CI of our PHP based projects (I am not java guy, so forgive me if I could not provide exact details.). We use JDepend 1.2.2 plugin to generate JDepend report for hudson from generated jdepend.xml which gets created during the build. We generate that file using Phing (which has a task to generate JDepend file.) + PHPDepend softwares.

From version 1.374, JDepend plugin has stopped to generate report from file and gives following errors in hudson's log file:

=========================================================================
Oct 7, 2010 2:35:45 PM hudson.model.Executor run
SEVERE: Executor throw an exception unexpectedly
java.lang.RuntimeException: Failed to serialize hudson.model.Actionable#actions for class hudson.model.FreeStyleBuild
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:98)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:38)
at com.thoughtworks.xstream.XStream.marshal(XStream.java:840)
at com.thoughtworks.xstream.XStream.marshal(XStream.java:829)
at com.thoughtworks.xstream.XStream.toXML(XStream.java:804)
at hudson.XmlFile.write(XmlFile.java:165)
at hudson.model.Run.save(Run.java:1402)
at hudson.model.Run.run(Run.java:1328)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:129)
Caused by: java.lang.RuntimeException: Failed to serialize hudson.plugins.jdepend.JDependBuildAction#jDependParser for class hudson.plugins.jdepend.JDependBuildAction
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:55)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:175)
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
... 18 more
Caused by: java.lang.RuntimeException: Failed to serialize org.codehaus.mojo.jdepend.JDependXMLReportParser#stack for class hudson.plugins.jdepend.JDependParser
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:167)
at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:135)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:130)
at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:120)
at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:94)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:175)
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
... 32 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: Could not call java.util.Stack.writeObject() : null
---- Debugging information ----
message : Could not call java.util.Stack.writeObject()
cause-exception : java.lang.NullPointerException
cause-message : null
-------------------------------
at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:104)
at com.thoughtworks.xstream.converters.reflection.SerializableConverter.doMarshal(SerializableConverter.java:215)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:58)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:175)
at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:163)
... 41 more
Caused by: java.lang.NullPointerException
at java.lang.Class.isAssignableFrom(Native Method)
at hudson.util.XStream2$1.serializedClass(XStream2.java:115)
at com.thoughtworks.xstream.mapper.MapperWrapper.serializedClass(MapperWrapper.java:34)
at com.thoughtworks.xstream.mapper.MapperWrapper.serializedClass(MapperWrapper.java:34)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:58)
at com.thoughtworks.xstream.converters.collections.ArrayConverter.marshal(ArrayConverter.java:45)
at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:63)
at com.thoughtworks.xstream.converters.reflection.SerializableConverter$1.defaultWriteObject(SerializableConverter.java:176)
at com.thoughtworks.xstream.core.util.CustomObjectOutputStream.defaultWriteObject(CustomObjectOutputStream.java:80)
at java.util.Vector.writeObject(Vector.java:1036)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteObject(SerializationMethodInvoker.java:100)
... 48 more

Oct 7, 2010 2:35:43 PM hudson.plugins.analysis.core.BuildResult loadResult
INFO: Loaded data file /home/hudson/jobs/Jobeet/builds/2010-10-07_14-02-19/dry-warnings.xml for build 89

Oct 7, 2010 2:35:43 PM hudson.plugins.analysis.core.BuildResult loadResult
INFO: Loaded data file /home/hudson/jobs/Jobeet/builds/2010-10-07_14-02-19/pmd-warnings.xml for build 89

Oct 7, 2010 2:35:41 PM hudson.plugins.analysis.core.BuildResult loadResult
INFO: Loaded data file /home/hudson/jobs/Jobeet/builds/2010-10-07_14-02-19/checkstyle-warnings.xml for build 89

Oct 7, 2010 2:35:39 PM hudson.model.Run run
INFO: Jobeet #92 main build action completed: SUCCESS

Oct 7, 2010 2:34:24 PM hudson.TcpSlaveAgentListener
INFO: JNLP slave agent listener started on TCP port 54637

Oct 7, 2010 2:34:21 PM hudson.model.Hudson$4 onAttained
INFO: Completed initialization
=========================================================================

Because of this problem hudson is not able to generate "build.xml" file in each build. Instead we could see files like "atomic7696684987998610266.tmp" which looks like incomplete version of "build.xml". The difference has been shown below

=> file "build.xml"

<stack serialization="custom">
<unserializable-parents/>
<vector>
<default>
<capacityIncrement>0</capacityIncrement>
<elementCount>0</elementCount>
<elementData>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
<null/>
</elementData>
</default>
</vector>
</stack>

=> file "atomic7696684987998610266.tmp"

<stack serialization="custom">
<unserializable-parents/>
<vector>
<default>
<capacityIncrement>0</capacityIncrement>
<elementCount>0</elementCount>
<elementData

I am not sure what exactly is causing this problem, whether hudson itself or JDepend plugin, but this needs to get fixed asap, otherwise JDepend plugin would become useless. I have tested this issue on 2 different projects and found same result.

Let me know if you need more details.