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Message:

this is a doubt on jini-on my final year project

Posted by vijaykumar on January 01, 2001 at 2:39 AM

Sir,
I am doing a project using the Jini Technology. I have few
problems.
Do help me in this regard..
1. I have implemented a service. My service is stepper motor control.
I dont have a problem on the hardware side. I wanted to make the
service to
make use of JoinManager where i had a problem .
The following error occured.
I got the error exactly at the execution of the following point.

JoinManager jm= new JoinManager(this,initattr,this,null,null);
where, initattr is an Entry class Array containing my device's
attributes.

the following error occured.
java.security.AccesControlException:Access
denied.(net.jini.discoveryPermission)
at
java.security.AccessController.CheckPermission(AccessControlContext.java :272)
at
java.lang.securityManager.CheckPermission(AccessController.java :399)
at
net.jini.Discovery.LookupDiscovery.checkGroups(LookupDiscovery.java :759)
at net.jini.Discovery.LookupDiscovery
(LookupDiscovery.java 726)
at net.jini.Discovery.LookupDiscoveryManager
(LookupDiscoveryManager.java : 332)
at
net.jini.Lookup.joinmanager.CreateJoinManager(JoinManager.java : 292)
at net.jini.Lookup.JoinManager (JoinManager. java :173)
at deviceimp1.execute(deviceimpl1.java :53)
at deviceimp1.main(deviceimpl1.java :30)
Exception in thread "main" Exit code 1
where deviceimp1 is my service program.

2. On the client side.
My client has implemented the discoveryListener Interface. I have not
implemented the lookup service. i am planning to use the Reggie Lookup
Service from Sun Microsystems. My discovered() method was never
called.

please help me in fixing up the bug.

Please Reply soon.
V.Vijay kumar