[rules-users] Drools Server 5.1.1 - Something wrong with the XStream Marshaller

[OlliSee]

Its impossible to add an "out-identifier" (which is pretty bad). The JSON
Marshaller works fine, though.

Can I get a clean implementation somewhere?

Exception:

Exception in thread "main" java.lang.NullPointerException
	at
com.thoughtworks.xstream.io.xml.PrettyPrintWriter.writeText(PrettyPrintWriter.java:203)
	at
com.thoughtworks.xstream.io.xml.PrettyPrintWriter.writeAttributeValue(PrettyPrintWriter.java:195)
	at
com.thoughtworks.xstream.io.xml.PrettyPrintWriter.addAttribute(PrettyPrintWriter.java:190)
	at
com.thoughtworks.xstream.io.WriterWrapper.addAttribute(WriterWrapper.java:41)
	at
org.drools.runtime.help.impl.XStreamXML$InsertConverter.marshal(XStreamXML.java:119)
	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
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:115)
	at
com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)
	at
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)
	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
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:837)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:826)
	at com.thoughtworks.xstream.XStream.toXML(XStream.java:801)
	at com.thoughtworks.xstream.XStream.toXML(XStream.java:789)
	at olli.Main.main(Main.java:58)

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