[TM4J-users] MergedTopicSubjectClashException

[Richard G. <ric...@ya...>]

Hi All,

I'm getting a TopicMapRuntimeException, ultimately caused by a MergedTopicSubjectClashException,
when I try to load a topic map into a particular topic map into a provide. A portion of the stack
track is below.

TopicMapProviderException. Caused by: . Cause: org.tm4j.topicmap.TopicMapProcessingException: 
Cause: org.tm4j.topicmap.TopicMapRuntimeException: 
Cause: org.tm4j.topicmap.MergedTopicSubjectClashException: Attempted to merge two topics with
different subjects,
Cause:Attempted to merge two topics with different subjects,
	at org.tm4j.topicmap.source.TopicMapSourceSupport.addTopicMap(TopicMapSourceSupport.java:37)
	at org.tm4j.topicmap.source.TopicMapSourceSupport.addTopicMap(TopicMapSourceSupport.java:69)
	at mips.genre.topicmaps.AddTopicMap.addToMemory(AddTopicMap.java:126)
	at mips.genre.topicmaps.AddTopicMap.main(AddTopicMap.java:57)

I want to use the MergedTopicSubjectClashException.getTopics() method to find out the causing of
the problem, so I have the following catch block:

catch(Exception e) {
			if (e.getCause().getCause().getCause() instanceof MergedTopicSubjectClashException) {
				Topic clashTopics[] = new Topic[2];
				((MergedTopicSubjectClashException)
e.getCause().getCause().getCause()).getTopics(clashTopics);			
				for (int i=0; i<clashTopics.length; i++) {
					Topic ct = clashTopics[i];
					System.out.println(ct.getID());
					Iterator nameIt = ct.getNames().iterator();
					while(nameIt.hasNext())
					{
						BaseName name = (BaseName)nameIt.next();	
					    System.out.println(name.getData());				
					}
					Iterator locIt = ct.getNames().iterator();
					while(locIt.hasNext())
					{
						URILocator loc = (URILocator)locIt.next();				
					    System.out.println(loc.getAddress());				
					}					
				}				
				e.printStackTrace();
			}
			else {
				e.printStackTrace();
			}	
		}

But, it looks like the getTopics() method isn't returning anything, as I get a
NullPointerException generated by the line: 

System.out.println(ct.getID());

This may just be something I'm doing wrong, so if anyone can point me in the right direction I'd
be grateful.

Cheers,

Richard.


	
	
		
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