Re: [TM4J-users] Merging Topicmaps using TMAPI

[Lars H. <he...@se...>]

Hi Lars,

[...]
> I would like to merge topicmaps by using TMAPI and write the result into a
> XTM file. So I use the mergIn(TopicMap) method. But when I use the
> serialize(OutPutStream, TopicMap) method from the tmapi-utils library I get
> the following error:

> java.lang.NullPointerException
[...]

Just for clarification: You don't get the NPE if you export a topic
map that has *not* been merged with another topic map?

Something like the following works:

    TopicMap tm = null;
    try {
        tm = tmSys.createTopicMap("http://somewhere.com/");
    }
    catch (TMAPIException ex) {
        // [...]
    }
    Topic t = tm.createTopic();
    TopicName tn = t.createTopicName("Hello World", null);
    for (int i=0; i < 5; i++) {
        Variant var = tn.createVariant("var_" + i, null);
    }

    serializeTopicMap(tm);


Best regards,
Lars
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