RE: [TM4J-users] NullPointerException when accessing Objects from Ozone via TMAPI

[Kal A. <ka...@te...>]

Hi Marcus,

It=92s a bit difficult to tell from just the stack trace. There are two
possible causes that you should check in your own code first:=20
1) are you passing a null parameter in to getObjectByID() ?
2) are you sure that the backend is initialized correctly and that you =
are
connected to the correct TopicMap instance ?

If you have some simple code that causes the problem, can you post that =
?

Cheers,

Kal

> -----Original Message-----
> From: tm4...@li... [mailto:tm4j-users-
> ad...@li...] On Behalf Of Marcus Frank
> Sent: 24 October 2005 17:10
> To: tm4...@li...
> Subject: [TM4J-users] NullPointerException when accessing Objects from
> Ozone via TMAPI
>=20
> Hello TM4J-Experts,
>=20
>=20
>=20
> I=92m trying to work with TMAPI and Ozone 1.1 as Backend for TM4J =
0.9.8. I=92m
> parsing an XTM-File with TMAPI-Utils, everything is fine. But when I =
try
> to access topics I get the following exception:
>=20
>=20
>=20
> java.lang.NullPointerException
>=20
>             java.util.Hashtable.get(Hashtable.java:333)
>=20
>=20
> =
org.tm4j.topicmap.ozone.OzoneTopicMapImpl.getObjectByID(OzoneTopicMapImpl=
.
> java:772)
>=20
>             sun.reflect.NativeMethodAccessorImpl.invoke0(Native =
Method)
>=20
>=20
> =
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java=
:
> 39)
>=20
>=20
> =
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorI=
m
> pl.java:25)
>=20
>             java.lang.reflect.Method.invoke(Method.java:324)
>=20
>=20
> =
org.ozoneDB.core.AbstractObjectContainer.invokeTarget(AbstractObjectConta=
i
> ner.java:233)
>=20
>=20
> org.ozoneDB.core.Transaction.invokeObject(Transaction.java:802)
>=20
>             =
org.ozoneDB.core.DbRemote.DbInvoke.perform(DbInvoke.java:63)
>=20
>=20
> org.ozoneDB.core.Transaction.performCommand(Transaction.java:416)
>=20
>=20
> =
org.ozoneDB.core.TransactionManager.performCommand(TransactionManager.jav=
a
> :403)
>=20
>=20
> =
org.ozoneDB.core.TransactionManager.completeTransaction(TransactionManage=
r
> .java:369)
>=20
>=20
> =
org.ozoneDB.core.TransactionManager.handleCommand(TransactionManager.java=
:
> 283)
>=20
>=20
> =
org.ozoneDB.core.TransactionManager.handleCommand(TransactionManager.java=
:
> 256)
>=20
>=20
> org.ozoneDB.core.InvokeServer.handleClientEvent(InvokeServer.java:78)
>=20
>=20
> =
org.ozoneDB.DxLib.net.DxMultiServerClient.run(DxMultiServerClient.java:44=
)
>=20
>             java.lang.Thread.run(Thread.java:534)
>=20
>=20
>=20
> Does anyone have any hints on that?
>=20
>=20
>=20
> More information: working on WinXP, Tomcat 5.0.28, TM4J 0.9.8, Ozone =
1.1
>=20
>=20
>=20
> Thanks in advance,
>=20
> Marcus
>=20
>=20
> ________________________________
>=20
> Ich verwende die kostenlose Version von SPAMfighter,
> die bis jetzt 716 Spammails entfernt hat.
> F=FCr private Anwender ist SPAMfighter v=F6llig kostenlos!
> Jetzt gratis testen: hier klicken
> <http://www.spamfighter.com/Lang_DE/Product_Info.asp> .