[Tm4j-developers] [ tm4j-Bugs-1749949 ] Topic.createTopicName(...) throws NullPointerException

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Bugs item #1749949, was opened at 2007-07-08 18:40
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Category: In-Memory Impl
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Kordzik (kordzik)
Assigned to: Nobody/Anonymous (nobody)
Summary: Topic.createTopicName(...) throws NullPointerException

Initial Comment:
This refers to release 0.9.8, in-memory implementation (although I doubt it has influence on the bug).

I use TMAPI interface. If it is attempted to create a TopicName with exactly the same value as previously removed TopicName (using Topic.createTopicName(String, Collection)), a RuntimeException is thrown, which is initiated by a NullPointerException.

As far as I could infer, it has something to do with internal events that notify listeners (indexes probably?) that new name was created.

The relevant part of the exception stack:

Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException
	at org.tm4j.tmapi.core.TMAPITopicImpl.createTopicName(TMAPITopicImpl.java:78)


Example code to replicate the bug:

//assumed TopicMap tm is instantianated beforehand
			
//creating new user topic
Topic type = tm.createTopic();
Topic t = tm.createTopic();

// creating scope collection
Vector<Topic> scope = new Vector<Topic>();
scope.add(type);
			
// creating name		t.createTopicName("name", scope);

//removing topic			
t.remove();

//creating new one		
t = tm.createTopic();

//RuntimeException occurs at the following line
t.createTopicName("name", scope);

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