Celebrate National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Objectspace's Voyager freezes on Namespace.lookup() call running under java 1.1 on Zaurus-5500 PDA.

Posted on 2003-11-17
3
Medium Priority
?
248 Views
Last Modified: 2008-03-17
I am trying to get an intrusion detection system running on a group of Zarusu-5500 PDA's communicating in an ad-hoc network mode. For this IDS, I would like to use mobile agents and have chosen Objectspace Inc's Voyager platform for my ORB and Messaging layers. I have a working application (IDS) using Voyager on multiple Linux desktop machines, running Java 1.4.2. When I attempt to run the ORB server on the PDA's under java 1.1, I receive an exception:

Could not start agent server:
 RuntimeRemoteException( java.net.ConnectException: Connection timed out: connect )

from the Namespace.lookup( serverName ) call to the PDA, where serverName = "//192.168.50.35:7000/Test" (<-- That is the IP of the PDA I am trying to add as a host for the mobile agent to move to). I know this is not a problem with my PATH or CLASSPATH variables as I have added all .jar files to the CLASSPATH and I know the code is working fine on the desktop machines. I have tried Voyager version 4.5, 4.6.1 and 4.7, all with the same result. I suspect version 4.6.1+ is not fully compatible with java 1.1, but I do not think I am using any calls that java 1.1 would dislike.

A typical run-through consists of:  
[on pda terminal, start up voyager orb server]  >voyager tcp://192.168.50.35:7000
["voyager orb professional 4.6.1, copyright...." prints on pda terminal screen]
[on another machine, start up IDS console application for adding in hosts and agents]
[this console asks for a serverName from input and sends the Namespace.lookup( serverName ) call]
[nothing returns from the pda, else timeout error as given above]

When running the console application from the PDA and the ORB server on a desktop machine, the console application throws an exception when trying to bind it's own ip address through Namespace.bind(). That exception is:

RuntimeRemoteException( java.io.IOException: java.lang.NoSuchMethodError: java/util/Vector.add(Ljava/lang/Object;)Z )

Since I am using java 1.1, java/util/Vector does not contain add(), but instead has addElement(). But, Voyager includes 'collections.jar' which has the java 1.2 version of java/util/Vector and supports add().

collections.jar is in my classpath, but it is possible Voyager is not using that newer version of Vector. Inside of collections.jar the path is com/sun/java/util/collections/Vector.class.

The Vector.add call from above is being called from inside of Voyager, a commercial application, so I can not change the call to Vector.addElement, nor change how that call is made or what paths are imported from inside the class that is calling Vector().

Any help on how to get this to use the correct Vector.class would be very helpful, and may be the only real problem I'm having (I hope).

Any help is greatly appreciated.
0
Comment
Question by:theotron5000
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
3 Comments
 
LVL 92

Accepted Solution

by:
objects earned 1500 total points
ID: 9767547
com.sun.java.util.collections.Vector and java.util.Vector are different classes.
To use com.sun.java.util.collections.Vector you need to create instances of it instead of java.util.Vector().

eg.

new com.sun.java.util.collections.Vector()

or:

import com.sun.java.util.collections.Vector;
...
new Vector();
0
 
LVL 92

Expert Comment

by:objects
ID: 9767885
If an existing classes is uses java.util.Vector, then there it is not possible to make it use com.sun.java.util.collections.Vector.
0
 
LVL 92

Expert Comment

by:objects
ID: 11274883
0

Featured Post

Enroll in September's Course of the Month

This month’s featured course covers 16 hours of training in installation, management, and deployment of VMware vSphere virtualization environments. It's free for Premium Members, Team Accounts, and Qualified Experts!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers learn about the third conditional statement “else if” and use it in an example program. Then additional information about conditional statements is provided, covering the topic thoroughly. Viewers learn about the third conditional statement …
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Suggested Courses

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question