i enter some configuration data for the project
and get this tomcat stacktrace:

HTTP Status 500 -

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type Exception report

message

description The server encountered an internal error () that prevented it from
fulfilling this request.

exception

javax.servlet.ServletException: Invalid final field
hudson.tasks.ArtifactArchiver.artifacts
org.kohsuke.stapler.Stapler.invoke(Stapler.java:220)
org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:110)

org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:211)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:157)
org.kohsuke.stapler.Stapler.service(Stapler.java:78)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

com.thoughtworks.xstream.converters.reflection.ObjectAccessException: Invalid
final field hudson.tasks.ArtifactArchiver.artifacts

com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.validateFieldAccess(PureJavaReflectionProvider.java:149)

com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:105)

com.thoughtworks.xstream.converters.reflection.ReflectionConverter.marshal(ReflectionConverter.java:44)

com.thoughtworks.xstream.core.ReferenceByXPathMarshaller.convertAnother(ReferenceByXPathMarshaller.java:36)

com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:68)

com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:47)

com.thoughtworks.xstream.core.ReferenceByXPathMarshaller.convertAnother(ReferenceByXPathMarshaller.java:36)

com.thoughtworks.xstream.converters.reflection.ReflectionConverter$1.writeField(ReflectionConverter.java:81)

com.thoughtworks.xstream.converters.reflection.ReflectionConverter$1.visit(ReflectionConverter.java:59)

com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:108)

com.thoughtworks.xstream.converters.reflection.ReflectionConverter.marshal(ReflectionConverter.java:44)

com.thoughtworks.xstream.core.ReferenceByXPathMarshaller.convertAnother(ReferenceByXPathMarshaller.java:36)
com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:46)

com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.marshal(ReferenceByXPathMarshallingStrategy.java:17)
com.thoughtworks.xstream.XStream.marshal(XStream.java:476)
com.thoughtworks.xstream.XStream.marshal(XStream.java:466)
com.thoughtworks.xstream.XStream.toXML(XStream.java:449)
hudson.XmlFile.write(XmlFile.java:71)
hudson.model.Job.save(Job.java:403)
hudson.model.Job.doConfigSubmit(Job.java:444)
hudson.model.Project.doConfigSubmit(Project.java:540)

jrockit.reflect.VirtualNativeMethodInvoker.invoke(Ljava.lang.Object;[Ljava.lang.Object;)Ljava.lang.Object;(Unknown
Source)

java.lang.reflect.Method.invoke(Ljava.lang.Object;[Ljava.lang.Object;I)Ljava.lang.Object;(Unknown
Source)
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:50)
org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:133)

org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:211)
org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:110)

org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)

note The full stack trace of the root cause is available in the Apache Tomcat/
5.5.17 logs.

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Apache Tomcat/5.5.17