[TM4J-users] Problem to create a new topic using the name of a deleted topic

[Dicheva, D. <dic...@ws...>]

Hi Lars and All,

I have a new problem :-(

I discovered that if I delete a topic with a certain name and after that
try to create a topic with the same name I cannot (see the trace below).
The exception is on the line: 

	t.createTopicName(topicName, null);    (I want the name to be
unconstrained)

I also tried:  t.createTopicName(topicName, new HashSet());   

I checked: t is not null; and the topicName ( tested with 't2') is  in
the TopicNamesIndex before the deletion of the topic name and not after
that (so everything looks normal). Below is the code I used to test the
deletion of the topic name when deleting a topic, and the result
(originally the removing of the scoping topics was not present):

TopicNamesIndex tni = UNames.getTopicNamesIndex(UTopicMaps.topicMap); 
System.out.println("tni before reindex");
Iterator i = tni.getTopicNamesByValue("t2").iterator();
while (i.hasNext()) System.out.println(i.next());

Iterator in = t.getTopicNames().iterator();    
while (in.hasNext()){
	TopicName bn = (TopicName) in.next();				
	Iterator itScope = bn.getScope().iterator(); 
	while (itScope.hasNext()) {					
		bn.removeScopingTopic((Topic)itScope.next()); 
	}
	bn.remove();		
}
tni.reindex();		
System.out.println("tni after reindex");
i = tni.getTopicNamesByValue("t2").iterator();
while (i.hasNext()) System.out.println(i.next());
System.out.println("deleted topic: "+t.getObjectId());
..
	
Here is the result
     [java] deleting topic: t2
     [java] tni before reindex
     [java] org.tm4j.tmapi.core.TMAPIBaseNameImpl@6cb8439c
     [java] tni after reindex
     [java] deleted topic: x1pdm557si-28a

I have set:
tmfac.setFeature("http://tmapi.org/features/merge/byTopicName",true);	

When I save the topic map after deleting the topic in the xtm file the
topic is not present, and yet, when I try to create a new topic with
that name, I get the exception.

I am really stuck and don't know what else to try. Please help.

Thanks,
Darina

---
 [java] java.lang.RuntimeException: java.lang.NullPointerException
     [java] 	at
org.tm4j.tmapi.core.TMAPITopicImpl.createTopicName(TMAPITopicImpl.java:8
0)
     [java] 	at
org.tm4l.core.utilities.utilitiesTM.UTopics.returnNewTopic(UTopics.java:
122)
     [java] 	at
org.tm4l.core.ui.dialogs.DialogCreateNewTopic.actionPerformed(DialogCrea
teNewTopic.java:164)
     [java] 	at
javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
     [java] 	at
javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
     [java] 	at
javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
     [java] 	at javax.swing.DefaultButtonModel.setPressed(Unknown
Source)
     [java] 	at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
     ..........
    [java] Caused by: java.lang.NullPointerException
     [java] 	at
org.tm4j.topicmap.memory.TopicImpl.addMergedTopic(TopicImpl.java:1053)
     [java] 	at
org.tm4j.topicmap.memory.TopicMapImpl.scopedNamesChange(TopicMapImpl.jav
a:990)
     [java] 	at
org.tm4j.topicmap.memory.TopicMapImpl.propertyChange(TopicMapImpl.java:1
087)
     [java] 	at
java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
     [java] 	at
java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
     [java] 	at
org.tm4j.topicmap.memory.TopicMapObjectImpl.firePropertyChange(TopicMapO
bjectImpl.java:254)
     [java] 	at
org.tm4j.topicmap.memory.TopicImpl.makeScopedNames(TopicImpl.java:1311)
     [java] 	at
org.tm4j.topicmap.memory.TopicImpl.propertyChange(TopicImpl.java:1459)
     [java] 	at
java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
     [java] 	at
java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
     [java] 	at
org.tm4j.topicmap.memory.TopicMapObjectImpl.firePropertyChange(TopicMapO
bjectImpl.java:254)
     [java] 	at
org.tm4j.topicmap.memory.BaseNameImpl.setData(BaseNameImpl.java:80)
     [java] 	at
org.tm4j.tmapi.core.TMAPITopicImpl.createTopicName(TMAPITopicImpl.java:7
3)
     [java] 	... 59 more