[TM4J-users] Re: TM4J-Ozone

[Gerd M. <ge...@sm...>]

Hi,

> I' just wanted to use tm4J with ozone and I had some problems to access 
> my imported xtm-TopicMaps.... 
> 
> // Import XTM  Version I
>   db = ExternalDatabase.openDatabase( dbURL );
>   db.reloadClasses();
>   try {
>     OzoneXTMBuilder builder= new OzoneXTMBuilder (db);
>     builder.buildTopicMap (
>         new InputSource(
>                 new FileInputStream(tmFileName)));
>     ....
>   } finally {
>     db.close();
>   }
> 
> But HOW can I access it???? 2nd try:

buildTopicMap() returns a TopicMap, which is a OzoneObject. Now you
could do: db.nameObject( topicmap, "aname" ); and retrieve the
topicmap later with: topicmap = (TopicMap)db.objectForName( "aname" );

> // Import XTM Version II
> try {
>   File f= new File ("sampleMap/music-xtm.xml");
>   java.io.InputStream inStream=new java.io.FileInputStream (f);
>               
>   OzoneTopicMapProviderFactoryImpl 
>         provider=new OzoneTopicMapProviderFactoryImpl();
>   if ( provider==null) {
>         System.err.println ("provider is null");
>   } // end of if ()
>   else {
>         Properties props=new Properties();
>         props.setProperty ("dburl",dbURL);
>         TopicMapProvider p =provider.createTopicMapProvider (props);
>         p.addTopicMap (inStream,new 
> java.net.URL("http://tqms.org/sample"),null);
>   } // end of else
> } catch (Exception e) {
>             System.out.println ("ErrMsg: "+e.getMessage());
> }
> 
> //access TopicMap
> try {
>   OzoneTopicMapProviderFactoryImpl 
>         provider=new OzoneTopicMapProviderFactoryImpl();
>   if ( provider==null) {
>         System.err.println ("provider is null");
>   } // end of if ()
>   else {
>         Properties props=new Properties();
>         props.setProperty ("dburl",dbURL);
>         TopicMapProvider p =provider.createTopicMapProvider (props);
>               TopicMap topicMap =p.getTopicMap ("http://tqms.org/sample");
>   } // end of else
> } catch (Exception e) {
>             System.out.println ("ErrMsg: "+e.getMessage());
> }
> 
> After I tried to access the topicMap I found the following errMsg in the log 
> of ozoneDB:
> 
> [info] (685) InvokeServer: connection established...
> [info] (317) InvokeServer: user logged in: ai114
> [warn] (317) InvokeServer: handleClientException(): java.io.EOFException: 
> Expecting code
>     java.io.EOFException: Expecting code
>         at java.lang.Throwable.<init>(Throwable.java:96)
>         at java.lang.Exception.<init>(Exception.java:44)
>         at java.io.IOException.<init>(IOException.java:49)
>         at java.io.EOFException.<init>(EOFException.java:57)
>         at java.io.ObjectInputStream.peekCode(ObjectInputStream.java:1557)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:298)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:242)
>         at org.ozoneDB.DxLib.net.DxClient.receive(DxClient.java:107)
>         at org.ozoneDB.DxLib.net.DxMultiServerClient.run(DxMultiServerClient.
>             java:44)
>         at java.lang.Thread.run(Thread.java:498)
> [info] (317) InvokeServer: connection closed (user: ai114)
> 
> Do you have any idea? 

The exception only says that you didn't close the db connection correct and
the client application simply exists. But I saw a bug in OzoneTopicMapProviderImpl
which I'm going to fix asap.

> Btw: I run IBM Jdk 1.3 with Linux, because neither j2sdk1.4.0 nor jdk1.3.1_01 
> are working properly with ozone classes. (2561 Segmentation fault)

Best Regards,
Gerd

--
________________________________________________________________
Gerd Mueller                                    ge...@sm...     
SMB GmbH                                  http://www.smb-tec.com