[Tm4j-developers] [ tm4j-Bugs-1698885 ] org.tm4j.topicmap.cmd.Merge crashes

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Bugs item #1698885, was opened at 2007-04-12 03:59
Message generated for change (Comment added) made by mediumnet
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Category: Import/Export
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Xuan Baldauf (mediumnet)
Assigned to: Nobody/Anonymous (nobody)
Summary: org.tm4j.topicmap.cmd.Merge crashes

Initial Comment:
call "java org.tm4j.topicmap.cmd.Merge -c test.xtm", where "test.xtm" is this file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topicMap PUBLIC "-//TopicMaps.Org//DTD XML Topic Map (XTM) 1.0//EN"
                          "http://www.topicmaps.org/xtm/1.0/xtm1.dtd">
<topicMap id="x1nnj36ct9-0"
  xmlns="http://www.topicmaps.org/xtm/1.0/" xmlns:xlink="http://www.w3.org/1999/xlink">
  <topic id="id129">
    <instanceOf>
      <topicRef xlink:href="#x1nnj36d5b-7"/>
    </instanceOf>
  </topic>
  <topic id="x1nnj36d5b-7">
    <subjectIdentity>
      <subjectIndicatorRef xlink:href="http://psi.somewhere/#something"/>
    </subjectIdentity>
  </topic>
</topicMap>

And you will get something like:

2    [main] FATAL org.tm4j.topicmap.cmd.Merge  - Unexpected exception.
java.lang.NullPointerException
        at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:994)
        at java.util.Collections$UnmodifiableSet.<init>(Collections.java:1066)
        at java.util.Collections.unmodifiableSet(Collections.java:1056)
        at org.tm4j.topicmap.memory.TopicMapObjectImpl.getSourceLocators(TopicMapObjectImpl.java:175)
        at org.tm4j.topicmap.memory.TopicImpl.getSourceLocators(TopicImpl.java:1673)
        at org.tm4j.topicmap.memory.TopicImpl.getSourceLocators(TopicImpl.java:1662)
        at org.tm4j.topicmap.utils.XTMWriter.getResourceID(XTMWriter.java:857)
        at org.tm4j.topicmap.utils.XTMWriter.getID(XTMWriter.java:927)
        at org.tm4j.topicmap.utils.XTMWriter.topicRef(XTMWriter.java:703)
        at org.tm4j.topicmap.utils.XTMWriter.onType(XTMWriter.java:605)
        at org.tm4j.topicmap.utils.TopicMapWalker.walk(TopicMapWalker.java:119)
        at org.tm4j.topicmap.utils.TopicMapWalker.walk(TopicMapWalker.java:86)
        at org.tm4j.topicmap.utils.TopicMapSerializer.serialize(TopicMapSerializer.java:373)
        at org.tm4j.topicmap.cmd.Merge.run(Merge.java:99)
        at org.tm4j.topicmap.cmd.AppBase.initialise(AppBase.java:190)
        at org.tm4j.topicmap.cmd.Merge.<init>(Merge.java:62)
        at org.tm4j.topicmap.cmd.Merge.main(Merge.java:117)

----------------------------------------------------------------------

>Comment By: Xuan Baldauf (mediumnet)
Date: 2007-04-12 09:54

Message:
Logged In: YES 
user_id=506885
Originator: YES

The cause seems to be in unmerging topics not being properly supported.
XTMUtils.flattenTopicRefs destroys some topics. However, these destroyed
topics may be merged with other topics. Thus, the destroyed topic needs to
be properly unmerged from its merging partners. This seems to be not
implemented.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=391879&aid=1698885&group_id=27895