Startup problem

[Martin Holz <ho...@fiz-chemie.de>]

After fixing the NPE in ObjectNode, I have an other startup problem.

java.lang.IllegalStateException: Existing binding users at / has to be removed first
	at org.apache.slide.structure.ObjectNode.addBinding(ObjectNode.java:480)
	at org.apache.slide.structure.ObjectNode.addChild(ObjectNode.java:460)
	at org.apache.slide.structure.StructureImpl.create(StructureImpl.java:499)
	at org.apache.slide.common.XMLUnmarshaller.loadObjectNode(XMLUnmarshaller.java:194)
	at org.apache.slide.common.XMLUnmarshaller.loadObjectNode(XMLUnmarshaller.java:305)
	at org.apache.slide.common.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:126)
	at org.apache.slide.common.NamespaceAccessTokenImpl.importData(NamespaceAccessTokenImpl.java:317)
	at org.apache.slide.common.Namespace.loadBaseData(Namespace.java:821)
	at org.apache.slide.common.EmbeddedDomain.addNamespace(EmbeddedDomain.java:230)

StructureImpl tries to add a store root node to its parent, even
if the node already exists. This will fail during startup. 

In my configuration the node /users is created in Domain.xml using

  <objectnode classname="org.apache.slide.structure.SubjectNode" uri="/users" >
        <permission action="/actions/read" subject="+/users/authors" />
  </objectnode>

and there is also a store mounted at /users.