Contacting nameserver without osagent
Norbert Frisch
Sun's JavaIDL example works fine in the JDK environment.
Now I want to run the Applet in Netscape using the built-in
Visigenic corba classes. Unfortunately, Visigenic locates everything
with the proprietary smart agent (osagent).
Moreover, I want not to use Visigenic's nameserver, but, say, Sun's
tnameserv.
I get the following error message in Netscape's Java console:
HelloApplet exception: org.omg.CORBA.ORBPackage.InvalidName
org.omg.CORBA.ORBPackage.InvalidName
at org.omg.CORBA.UserException.<init>(Compiled Code)
at org.omg.CORBA.ORBPackage.InvalidName.<init>(Compiled Code)
at com.visigenic.vbroker.CORBA.dynamic.OrbHelperImpl.resolve_initial_references(Compiled Code)
* at com.visigenic.vbroker.CORBA.ORB.resolve_initial_references(Compiled Code)
at HelloApplet.init(Compiled Code)
...
The corresponding code line is:
org.omg.CORBA.Object objRef =
orb.resolve_initial_references("NameService");
Thank's a lot for your advice.
Norbert
--
---------------------------------------------------------------------------
Norbert Frisch Room 2.115
Visualization and Interactive Systems (VIS) Computer Science Institute
Email: fri...@informatik.uni-stuttgart.de Stuttgart University
Phone: 0049 (0)711 7816 454 Breitwiesenstraße 20-22
Fax: 0049 (0)711 7816 340 70565 Stuttgart, Germany
---------------------------------------------------------------------------
Rainer 'rain' Frohnhoefer
> Hello !
>
> Sun's JavaIDL example works fine in the JDK environment.
> Now I want to run the Applet in Netscape using the built-in
> Visigenic corba classes. Unfortunately, Visigenic locates everything
> with the proprietary smart agent (osagent).
> Moreover, I want not to use Visigenic's nameserver, but, say, Sun's
> tnameserv.
> I get the following error message in Netscape's Java console:
>
> HelloApplet exception: org.omg.CORBA.ORBPackage.InvalidName
> org.omg.CORBA.ORBPackage.InvalidName
> at org.omg.CORBA.UserException.<init>(Compiled Code)
> at org.omg.CORBA.ORBPackage.InvalidName.<init>(Compiled Code)
> at com.visigenic.vbroker.CORBA.dynamic.OrbHelperImpl.resolve_initial_references(Compiled Code)
> * at com.visigenic.vbroker.CORBA.ORB.resolve_initial_references(Compiled Code)
> at HelloApplet.init(Compiled Code)
> ...
>
> The corresponding code line is:
> org.omg.CORBA.Object objRef =
> orb.resolve_initial_references("NameService");
>
You're in JDK 2, right?
To disable the osagent lookup, use
---
.....
java.util.Properties props = new java.util.Properties();
props.put("ORBdisableLocator", "true");
.....
orb_ = org.omg.CORBA.ORB.init(this, props);
.....
---
I'm not so sure that the code generated with Sun's idltojava will work with netscape's builtin
Visibroker (2.5 or so). Maybe you need a Visibroker dev package and use its idl2java program with
appropriate options.
Are the the .java files generated with idl*java interchangeable between different orbs?
... more questions ... &)
-Rain.
--
"To save energy
we will temporarily switch off
the light at the end of the tunnel."
(I don't employ for my speaker)
Norbert Frisch
Netscape has built in JRE 1.1.5,
but for development I used JDK 1.2.
> java.util.Properties props = new java.util.Properties();
> props.put("ORBdisableLocator", "true");
> .....
> orb_ = org.omg.CORBA.ORB.init(this, props);
Thanks a lot, I think this will work.
> I'm not so sure that the code generated with Sun's idltojava will work with netscape's builtin
> Visibroker (2.5 or so). Maybe you need a Visibroker dev package and use its idl2java program with
> appropriate options.
>
> Are the the .java files generated with idl*java interchangeable between different orbs?
Good question.
As I can tell, a basic client compiled with JDK idl compiler worked in Netscape
with Visibroker. Seems to me, that Visigenic ORB is wrapped by org.omg.CORBA.ORB,
so that the interface might be independent.
However, I have some trouble at present to run a
CORBA server under netscape, which runs well with appletviewer.
This problem seems not beeing directly connected to CORBA.
Here's the detailed java console trace:
# Loading class HelloApp._HelloImplBase
# Fetching http://wwwvis.informatik.uni-stuttgart.de/~frisch/javatest/HelloApp/_HelloImplBase.class
# Loading class org.omg.CORBA.DynamicImplementation
# Fetching http://wwwvis.informatik.uni-stuttgart.de/~frisch/javatest/org/omg/CORBA/DynamicImplementation.class
# Applet exception: HelloApp/_HelloImplBase
java.lang.NoClassDefFoundError: HelloApp/_HelloImplBase
at java.lang.ClassLoader.defineClass(ClassLoader.java:250)
at netscape.applet.AppletClassLoader.loadClass(AppletClassLoader.java:617)
at netscape.applet.AppletClassLoader.findClass(AppletClassLoader.java:802)
at netscape.applet.AppletClassLoader.loadClass1(AppletClassLoader.java:685)
* at netscape.applet.AppletClassLoader.loadClass(AppletClassLoader.java:649)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
at HelloServerApplet$CorbaThread.run(HelloServerApplet.java:33)
# Applet HelloServerApplet HelloApp/_HelloImplBase
java.io.IOException: vcafe: not found
at java.lang.Runtime.exec(Runtime.java:170)
* at java.lang.Runtime.exec(Runtime.java:134)
at netscape.debug.Debugger.launchDebugger(Debugger.java:93)
at netscape.debug.Debugger.uncaughtException(Debugger.java:37)
at netscape.applet.AppletThreadGroup.uncaughtException(AppletThreadGroup.java:49)
So, the appropiate file is loaded, but the contained class is not loaded.
javap reprted that the class is in the file.
Here is part of the related code:
public class HelloServant extends_HelloImplBase {...}
...
helloRef = new HelloServerApplet.HelloServant();
I think I had a similar problem long time ago, not connected to
corba. But I don't know the solution anymore.
Do you have some advice ?
Sincerely,
Norbert
Mike Moran
[ ... ]
> Here is part of the related code:
>
> public class HelloServant extends_HelloImplBase {...}
> ...
> helloRef = new HelloServerApplet.HelloServant();
This may be a stupid suggestion, but: shouldn't there be a space between
"extends" and "_HelloImplBase" ?
--
Mike Moran, Dept. of Electrical Engineering, The University of Edinburgh
King's Buildings, Mayfield Rd, Edinburgh EH9 3JL
Rainer 'rain' Frohnhoefer
> [snip]
> Here's the detailed java console trace:
>
> # Loading class HelloApp._HelloImplBase
> # Fetching
> # Loading class org.omg.CORBA.DynamicImplementation
> # Fetching ...
> # Applet exception: HelloApp/_HelloImplBase
> java.lang.NoClassDefFoundError: HelloApp/_HelloImplBase
> at java.lang.ClassLoader.defineClass(ClassLoader.java:250)
> [snip]
> So, the appropiate file is loaded, but the contained class is not loaded.
> javap reprted that the class is in the file.
>
> Here is part of the related code:
>
> public class HelloServant extends_HelloImplBase {...}
> ...
> helloRef = new HelloServerApplet.HelloServant();
>
> I think I had a similar problem long time ago, not connected to
> corba. But I don't know the solution anymore.
Looks like a compiler/classpath problem to me. Are you sure you compiled the IDL-generated files into the right
directory? (or, the right source files into the right directory) The '_xxxImplBase.java' are generated by idltojava
and should be there. I don't know if the sun idltojava supports a '-package' switch, maybe it has put things where
you'd never expected them.
Hope this helps,