Applet EJB Coomunication

Hi,
I am trying the applet ejb communication .
I am very comfortable if I do the same with applet servlet communication but the problem is with the applet calling the ejb directly, i mean to say that can applet can directly lookup the EJB ?
I had tried on the intranet but we are supposed to give the HOme and remote files to the client also the ejb.jar has to be given as the JVM of the clinet doesnot have the javax.ejb package and all relevant pacakages are to be given,
There is no meaning of making the client EJB compitable.
Also what about the security ?
So can any body help me how to do the same.
Thanks in advance.
Milind

Remove ur applet ejb communication by
applet to servlet/serverside class then from that servlet/serverside clas to ejb..
This concept is done by a pattern called 'business delegate'.
By using this approach u need not give the stub and skull to the front end side (jsp/applet/or anything like that).
just call the servlet/class from the applet by keeping that class as passover and thereby the lookup details are moved to that servlet/class that could resolve your problem..
does my answer make any sense to u..

Similar Messages

Applet -ejb ; weblogic.jar

Hi,
I am trying to access EJB from an applet thro' ejb-client.jar. It works fine if I include weblogic.jar in the applet archive but it throws a corba exception if I use wlclient.jar and wljmsclient.jar instead of weblogic.jar in the archive. As weblogic.jar is too huge I want to use thin clients. Could someone help me with this exception. I am using WLS8.1_sp4; jdk 1.4.2_05 and ie6 with latest jvm. Both applet and ejb are deployed in same localhost
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com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Creating message
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4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Client get called: host = 172.16.65.14 port = 7001
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Creating new connection Connection[type=IIOP_CLEAR_TEXT remo
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/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): getEndpoint(IIOP_CLEAR_TEXT, 0, null)
com.sun.corba.se.internal.iiop.GIOPImpl(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,4,file:
/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): createListener( socketType = IIOP_CLEAR_TEXT port = 0 )
javax.naming.NamingException: Unhandled exception in lookup [Root exception is org.omg.CORBA.MARSHAL: vmcid: SUN minor cod
e: 217 completed: Maybe]
at weblogic.corba.j2ee.naming.Utils.wrapNamingException(Utils.java:81)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:237)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:171)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at informatics.inventory.plates.editor.EJBPlateMapDAO.<init>(Unknown Source)
at informatics.inventory.plates.editor.PlateMapEditor.init(Unknown Source)
at sun.applet.AppletPanel.run(AppletPanel.java:353)
at java.lang.Thread.run(Thread.java:534)
Caused by: org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 217 completed: Maybe
at com.sun.corba.se.internal.iiop.CDROutputStream_1_0.write_wstring(CDROutputStream_1_0.java:464)
at com.sun.corba.se.internal.iiop.CDROutputStream.write_wstring(CDROutputStream.java:189)
at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameComponentHelper.write(WNameComponentHelper.java:79)
at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameHelper.write(WNameHelper.java:59)
at weblogic.corba.cos.naming._NamingContextAnyStub.resolve_any(_NamingContextAnyStub.java:79)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:213)
... 6 more

Hi,
I am trying to access EJB from an applet thro' ejb-client.jar. It works fine if I include weblogic.jar in the applet archive but it throws a corba exception if I use wlclient.jar and wljmsclient.jar instead of weblogic.jar in the archive. As weblogic.jar is too huge I want to use thin clients. Could someone help me with this exception. I am using WLS8.1_sp4; jdk 1.4.2_05 and ie6 with latest jvm. Both applet and ejb are deployed in same localhost
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Client get called: host = localhost port = 7001
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Creating new connection Connection[type=IIOP_CLEAR_TEXT remo
te_host=localhost remote_port=7001 state=ESTABLISHED]
com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Creating message
from stream
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
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com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Reading the mess
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com.sun.corba.se.internal.iiop.IIOPInputStream(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Constructing IIO
PInputStream object
com.sun.corba.se.internal.iiop.IIOPInputStream(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Setting the time
stamp
com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Creating message
from stream
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Client get called: host = 172.16.65.14 port = 7001
com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Creating new connection Connection[type=IIOP_CLEAR_TEXT remo
te_host=172.16.65.14 remote_port=7001 state=ESTABLISHED]
com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for 172.16.65.14:7001,4,ORB ThreadGroup]): Creating mess
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com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,
4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Succesfully created socket for new connection
com.sun.corba.se.internal.iiop.GIOPImpl(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,4,file:
/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): getEndpoint(IIOP_CLEAR_TEXT, 0, null)
com.sun.corba.se.internal.iiop.GIOPImpl(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,4,file:
/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): createListener( socketType = IIOP_CLEAR_TEXT port = 0 )
javax.naming.NamingException: Unhandled exception in lookup [Root exception is org.omg.CORBA.MARSHAL: vmcid: SUN minor cod
e: 217 completed: Maybe]
at weblogic.corba.j2ee.naming.Utils.wrapNamingException(Utils.java:81)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:237)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:171)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at informatics.inventory.plates.editor.EJBPlateMapDAO.<init>(Unknown Source)
at informatics.inventory.plates.editor.PlateMapEditor.init(Unknown Source)
at sun.applet.AppletPanel.run(AppletPanel.java:353)
at java.lang.Thread.run(Thread.java:534)
Caused by: org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 217 completed: Maybe
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at com.sun.corba.se.internal.iiop.CDROutputStream.write_wstring(CDROutputStream.java:189)
at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameComponentHelper.write(WNameComponentHelper.java:79)
at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameHelper.write(WNameHelper.java:59)
at weblogic.corba.cos.naming._NamingContextAnyStub.resolve_any(_NamingContextAnyStub.java:79)
at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:213)
... 6 more

Applet-ejb; corba exception

Hi, I am trying to access EJB from an applet thro' ejb-client.jar. It works fine if I include weblogic.jar in the applet archive but it throws a corba exception if I use wlclient.jar and wljmsclient.jar instead of weblogic.jar in the archive. As weblogic.jar is too huge I want to use thin clients. Could someone help me with this exception. I am using WLS8.1_sp4; jdk 1.4.2_05 and ie6 with latest jvm. Both applet and ejb are deployed in same localhost com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Client get called: host = localhost port = 7001 com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Creating new connection Connection[type=IIOP_CLEAR_TEXT remo te_host=localhost remote_port=7001 state=ESTABLISHED] com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Creating message from stream com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Succesfully created socket for new connection com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Reading the mess age fully, size =1204 com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Handling GIOP 1. 0 LocateReply com.sun.corba.se.internal.iiop.IIOPInputStream(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Constructing IIO PInputStream object com.sun.corba.se.internal.iiop.IIOPInputStream(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Setting the time stamp com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for localhost:7001,4,ORB ThreadGroup]): Creating message from stream com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Client get called: host = 172.16.65.14 port = 7001 com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Creating new connection Connection[type=IIOP_CLEAR_TEXT remo te_host=172.16.65.14 remote_port=7001 state=ESTABLISHED] com.sun.corba.se.internal.iiop.MessageMediator(Thread[JavaIDL Reader for 172.16.65.14:7001,4,ORB ThreadGroup]): Creating mess age from stream com.sun.corba.se.internal.iiop.ConnectionTable(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class, 4,file:/C:/projects/perforce/java/PlateMapViewer/-threadGroup]): Succesfully created socket for new connection com.sun.corba.se.internal.iiop.GIOPImpl(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,4,file: /C:/projects/perforce/java/PlateMapViewer/-threadGroup]): getEndpoint(IIOP_CLEAR_TEXT, 0, null) com.sun.corba.se.internal.iiop.GIOPImpl(Thread[thread applet-informatics.inventory.plates.editor.PlateMapEditor.class,4,file: /C:/projects/perforce/java/PlateMapViewer/-threadGroup]): createListener( socketType = IIOP_CLEAR_TEXT port = 0 ) javax.naming.NamingException: Unhandled exception in lookup [Root exception is org.omg.CORBA.MARSHAL: vmcid: SUN minor cod e: 217 completed: Maybe] at weblogic.corba.j2ee.naming.Utils.wrapNamingException(Utils.java:81) at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:237) at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:171) at javax.naming.InitialContext.lookup(InitialContext.java:347) at informatics.inventory.plates.editor.EJBPlateMapDAO.<init>(Unknown Source) at informatics.inventory.plates.editor.PlateMapEditor.init(Unknown Source) at sun.applet.AppletPanel.run(AppletPanel.java:353) at java.lang.Thread.run(Thread.java:534) Caused by: org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 217 completed: Maybe at com.sun.corba.se.internal.iiop.CDROutputStream_1_0.write_wstring(CDROutputStream_1_0.java:464) at com.sun.corba.se.internal.iiop.CDROutputStream.write_wstring(CDROutputStream.java:189) at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameComponentHelper.write(WNameComponentHelper.java:79) at weblogic.corba.cos.naming.NamingContextAnyPackage.WNameHelper.write(WNameHelper.java:59) at weblogic.corba.cos.naming._NamingContextAnyStub.resolve_any(_NamingContextAnyStub.java:79) at weblogic.corba.j2ee.naming.ContextImpl.lookup(ContextImpl.java:213) ... 6 more

I had the same problem and finally caught a statement in one of the docs: "To facilitate the use of IIOP, always specify a valid IP address or DNS name for the Listen Address attribute in the configuration file (config.xml) to listen for connections." I edited my config.xml file and put in the ip address of the machine running my WLS and things started working. Hope this works for you.
Regards,
Ron

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null

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Frank:
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The errors I am getting are explained in this post Getting "Unable to find referenced object" at random when opening JDev When I open JDeveloper and HAVE AN ASSOCIATION OPEN IN THE EDIT PANE, then I will get a "unable to reference object" error on some associations. This appears to be caused by our use of refactor in 10g in these entities which was then migrated over to 11g. 2 other people in that thread confirmed that they have had problems with refactor. There is a lot more detail in that thread.
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If you want me to check it out will I get Oracle consulting fees? :)
Thanks.
Mary
UofW

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Thanks

Hi there,
This is a tricky question and it would be interesting to hear what others think.
Probably the key factor is what is available to you in terms of communications between the EJB and the applet. If you are on an intranet then having the applet talk directly to the EJB looks favourable as you will almost certainly be able to use RMI/IIOP for communications between the applet and the EJB. If you are forced to use HTTP as the communications protocol then you can't talk directly from the applet to the EJB but there again talking to a Servlet from an applet throws up complications of it's own. In this case you should consider not using an applet at all and instead use a JSP page or pages to handle the presentation.
There is another issue that you need to consider when the applet talks directly to the EJB. If the App server that contains the EJB is on a different system to the one that runs the Web Server you'll have to address some security issues and will have to either have local policy files for the systems running the applet or you'll have to sign the applet and have the clients trust it.
Hope this helps
Amanda
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers

Deployment of Ejb's, Applet calls from a Browser

Hello, and thank you for taking the time to review my post....
PII Celeron 333mHz
256 Megs Ram
Windows NT 4.0 Workstation (SP3)
JDeveloper2.0(Build 343)
Oracle 8.1.5
Netscape 4.06
Everything resides on the same machine.
Problem 1: I had no trouble deploying EJB's initially. As their
size grew, they became increasingly difficult to deploy. Long
delays(10 mins.)were, and are still encountered. Is that
acceptable for a minimal sized EJB? I've also noticed when my
deployment fails, (different errors are presented on different
occassions), it becomes impossible to deploy an EJB without first
closing, and restarting Jdeveloper. Is that normal behavior.?
Other times my deployment hangs when the Oracle 8i deployment is
called. I test my IIOP connection in Jdeveloper, and it fails to
work. I can't access the "sess_sh" from a command prompt either.
Would you know the cause(s)? Which steps should be taken in order
to remedy the situation..? A shutdown, and restart of the
database?
Problem 2: EJB1 is deployed to the database. A simple applet(with
the standalone option) is created. It calls EJB1 from within
Jdeveloper without trouble. Though when i attempt to run the
applet via the provided HTML file, it fails. The HTML file brings
up the appletviewer, which stalls after the applet is started. Is
an invalid "archive" file provided in the applet tag? Which
".jar" file should be present..the *Generated.jar file?
With regards to running the applet in Netscape, it fails. When i
deploy the ejb, should i include the "java40.jar" file as a
dependancy..? Should the "applet.class" file be included in the
deployment as well.? Should the typical Jdeveloper classes be
also stored in the ..Netscape\Program\java\classes directory?
Would someone be able to provide me with a simple applet, ejb
scenario, stating which .jar files are needed, and where they
should be present etc..?
My thanks in advance :)
Robert
null

Hey Mark,
Maybe you can help then, I am getting the below errors (I am
pasting in a message I wrote earlier):
Hello,
I think I got one that could stump a bunch of ya... we'll see.
I wrote an EJB in JDev. 2.0 and deployed it. Worked well, no
problems. Wrote a Client Snippet, worked well (never tested
outside JDev.). Wrote a Client Applet, works very well INSIDE
JDEV. 2.0, once I try to run it outside JDev, I get nothing but
Exceptions.
SO, I tried deploying it to a jar, made sure to add all the
propper .jar and .zip files and everything. I deploy it and run
it inside IE 5.0 (using OBJECT instead of APPLET tags with the
right java plug in etc.), that hangs. SO i use appletviewer to
pick up the error messages and I get the stuff below (exception
and stack trace at end of message).
java.naming.factory.initial (which is in the exception message)
was new to me so I spent the last two days reading about JNDI
etc, and found out that it is just an environment property for
JNDI and that ORACLE does not use it once in any of its examples
or anything.
I have been unable to locate AURORA's version of its
ContextFactory (I tried just about every class with the word
Factory in it -- took forever), and none of those worked. To be
exact I found one class that looked like it could have worked:
oracle.aurora.jndi.sess_iiop.sess_iiopURLContextFactory.class...
I tried that, but that returned a ClassCastException.
So here's my synopsis: Inside JDEV for some reason the command:
Context ic= new InitialContext(environment);
works, as long as I specify a minimal number of environment
properties: javax.naming.Context.URL_PKG_PREFIXES (which I set
to, as Oracle says to do,
oracle.aurora.jndi),Context.SECURITY_PRINCIPAL,
Context.SECURITY_CREDENTIAL, and the NO_SSL one too. That works
fine in JDEV, throws the exception (see below) outside of JDEV.
If then try to specifiy a context factory
(Context.INITIAL_CONTEXT_FACTORY
constant) of the class type above I throw the exception shown
above inside and outside of JDEV (i.e. in appletviewer). Here's
where it gets weird:
If I use the above configuration that works in JDEV (no initial
context factory environment setting) and try to print out via
the list() method the context's bindings, I get the same
exception that is seen below. SO the only time it works, is when
I don't specify the initial context factory and I ONLY run it
inside JDEV WITHOUT performing any actions on the instantiated
context variable other than a lookup. REALLY WEIRD!
So please help ASAP, thanks.
Nadim Homsany
Systems Analyst
Message: Need to specify class name in environment or system
property: java.naming.factory.initial
javax.naming.NoInitialContextException: Need to specify class
name in environment or system property:
java.naming.factory.initial
at
javax.naming.spi.NamingManager.getDefaultInitialContextFactory
(Naming Manager.java:688)
at javax.naming.spi.NamingManager.getInitialContext
(NamingManager.java:7
44)
at javax.naming.InitialContext.getDefaultInitCtx
(InitialContext.java:181
at javax.naming.InitialContext.getURLOrDefaultInitCtx
(InitialContext.jav
a:219)
at javax.naming.InitialContext.lookup
(InitialContext.java:288) at
testejb.FirstEJBClientApplet.startEJB
(FirstEJBClientApplet.java:151)
at testejb.FirstEJBClientApplet.jbInit
(FirstEJBClientApplet.java:72)
at testejb.FirstEJBClientApplet.init
(FirstEJBClientApplet.java:61)
at sun.applet.AppletPanel.run(AppletPanel.java:357)
at java.lang.Thread.run(Thread.java:479)
mark tomlinson (guest) wrote:
: You need to link the applet with the xxxxxx_generated.jar that
: comes back from the deployment tool (and that is really all you
: need to include which is specific to the EJB). Try enabling the
: java console for the browser so you can get more specifc error
: messages.
null

Can EJB work acrros different NetWorks(subnets)...

I have deployed EJB in OAS 4.0.8.2 which works fine with LAN environment. But the same refuse to do so, when hosted with ISP.
Applet is my client to EJB.
The LOOKUP failure occurs(CORBA.COMM_FAILURE). When discussed, I got these infos.
1. EJB may be a layer 2 protocol which does not allow it to work across different subnets.
2. Applet-EJB connectivity can not by bass the socket layer.
3. Firewalls, doesnot allow the EJB connections to be performed.
This means EJB can not work in Internet scenario... Is that so....
Can any one help me???
Thanks for the efforts u will be taking...
Serin.
null

You can actually use one linksyssmartwifi accounts to multiple routers as long as you were able to associate those routers with your account. So even if you are at your office, home or vice versa; you can still access your router remotely as long as your account and the routers have been associated.

DAC APPLET DEPLOYMENT(urgent)

Iam getting problem when deploying DAC APPLET
.iam getting exception of :
cannot instantiateclass JboInitialContextFactory
detail:DAC405:sessionInfo:oracle.jbo.common.jboInitialContextFactory
applicationModuleCrationfailed
pls Respond Immediately
this is urgent

<BLOCKQUOTE>quote:<HR>Originally posted by Joe Martine ([email protected]):
I have a similiar situation deploying to Visibroker. What are you trying to do? Maybe we can help each other????<HR></BLOCKQUOTE>
Type 'Deplying a Java From' in Help. Under 'Deplying an Infobus Java applet' is a paragraph (maybe the second) which says that its not possible to use DAC Applet clients for EJBs, etc. (if that is what ur trying to do). However, it says that DAC applet client deployment is possible with Visibrobroker objects. Joe, what exactly is it that ur trying to do? I'm working on the
applet --> servlet --> EJB --> Oracle
walkaround for the applet --> EJB problem. If anyone had any success on this using JDeveloper or any leads please reply here or e-mail to [email protected]
null

How to get access Java Application in PDA?

Hi Folks,
I am handling a project which was developed in J2EE. This projetc contains Applets, EJB's developed in Struts frame work. Now client is requesting us to get access of this application in PDA.
1)To get access in PDA, is it necessary to have my application enhanced with J2ME?
2) Is there any PDA compatible JVM is required?
3) Is there any third party tool to do so?
Thanks.
Durga.

Hi Folks,
I am handling a project which was developed in J2EE. This projetc contains Applets, EJB's developed in Struts frame work. Now client is requesting us to get access of this application in PDA.
1)To get access in PDA, is it necessary to have my application enhanced with J2ME?
2) Is there any PDA compatible JVM is required?
3) Is there any third party tool to do so?
Thanks.
Durga.

NullPoniter Exception while Adding in JComboBox

Hi All, My application is a Applet - EJB based and Server is sending Serialized Objects to add in to the JCOMBOBOX object.
I have the following Exception coming up after a few iteratons ( 200 ) of opening up the screen and closing it which I am doing at a normal speed.
Code......
List lstSeverities = (List)e.getReturnValue();
if(lstSeverities!=null){
Iterator oIterator = lstSeverities.iterator();
while (oIterator.hasNext())
CaseSeverity oCaseSeverity = (CaseSeverity)oIterator.next();
if(oCaseSeverity != null && oCaseSeverity.getSeverityName() != null)
m_cbxSeverity.addItem(oCaseSeverity); /* This Statement is throwing exception.*/}
StackTrace.......
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.contentsChanged(Unknown Source)
at javax.swing.plaf.basic.BasicComboBoxUI$ListDataHandler.intervalAdded(Unknown Source)
at javax.swing.AbstractListModel.fireIntervalAdded(Unknown Source)
at javax.swing.DefaultComboBoxModel.addElement(Unknown Source)
at javax.swing.JComboBox.addItem(Unknown Source)
at sync.client.contactmgmt.activity.CaseGeneral.handleResponse(CaseGeneral.java:1382)
at sync.client.gateway.ServerProxy.handleResponse(ServerProxy.java:96)
at sync.client.gateway.UniversalGateway$1.run(UniversalGateway.java:142)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Note - 1. This Exception is coming only once in some 200 repetitions.
2. The issue is with only this ComboBox , I have another 10 ComboBox.
3. This ComboBox is populated with Serialized objects.
Please help to identify the cause and to resolve this.
Thanks.

I have looked in Sun sources:
Regarding the stack trace u post:
from AbstractListModel source
protected void fireIntervalAdded(Object source, int index0, int index1)
     Object[] listeners = listenerList.getListenerList();
     ListDataEvent e = null;
     for (int i = listeners.length - 2; i >= 0; i -= 2) {
     if (listeners[i] == ListDataListener.class) {
          if (e == null) {
          e = new ListDataEvent(source, ListDataEvent.INTERVAL_ADDED, index0, index1);
          ((ListDataListener)listeners[i+1]).intervalAdded(e);
it fires an event that is hanled in nested class ListDataHanlder of
BasicComboBoxIUI:
public void intervalAdded( ListDataEvent e ) {
     isDisplaySizeDirty = true;
     contentsChanged( e );
it invokes the contentChanged mothod of the same nested class
public void contentsChanged( ListDataEvent e ) {
     if ( !(e.getIndex0() == -1 && e.getIndex1() == -1) ) {
          isMinimumSizeDirty = true;
          comboBox.revalidate();
Now:
The 2 objects that might be null are
1) e: the event
Improbably, is the event dispatched from the JComboxBox add method
2) the comboBox Object
Most probably.
I imagine that, when the event is disptached, the JComboBox is valid
(not equals to null)
But when the events reaches contentChange method, the comboBox
pointer in BasicComboBoxUI is just null.
This pointer is setted by installUI method and is forced to null
in uninstallUI method.
So, it semmes to be not a Swing bug, but, most probably,
somothing in your code cause the call of unistallUI method or,
simply, destroys the JComboBox after that the event is shipped.
Take a look.

Suggest me a doable project to do in my summer vacation

So ya, summer vacation is starting for me and i want to test my java skills so what java projects do you suggest me to code in my free time?
I know you aint mind readers so here is some background info:
i'm a senior computer science student graduating next year at university level. I have 3 years experience with java programming and have created several applications like a webserver with RMI, bankingsystem with EJB's and JSP frontend. Coded GUI applications with Swing and AWT (prefer swing) made a few applets (beginners level) etc
keywords: RMI, servlets, applets, EJB (2.1, 3.0 mediocore) ,cli's, spring framework, swing, awt, webservices(not very experienced with this) etc
I just want to do this for fun so any tips or suggestions are welcome :D
ps not sure if this is the right board or even the forum but i didn't knew where to post this. Oh well..

You can make your own YM, so that we can chat live.I already made a simple chat program that enable users to chat with eachother with smiley, user commando's, smilies private messaging etc using JMS.
I suppose i can create another one but i want to learn something new. Thanks for the reply though ;d

Help:java.lang.ClassNotFoundException

we have one application.We are calling ejb through applet.
We have sybase EAServer3.6.1 and jaguar 3.6.1.Java code is in jdk118 and ejb1.0.
Our architacture is: applet<->ejb<->server.
Our ejb is deployed on server.That we are calling our ejb through applet.Whole code for applet and ejb is lying on server.When we run our application through browser from different m/c we are getting two errors.
1)com.ms.security.SecurityExceptionEx.
2)powersoft.powerj.jaguar.InitialContextException: javax.naming lookup failed for component: HelloEJBPackage/HelloEJB
Exception: [Root exception is [Root exception is java.lang.ClassNotFoundException: java.rmi.Remote]javax.naming.NamingException]javax.naming.NamingException.
When I set classpath on each m/c.
i.e (c:/prog/sybase/shard/sun/jdk118/lib/classes.zip) my application is running fine it just gives warning for securiety not for lookup method failed.
Our system is in production.We can not make setting for individual clients.We need our applet should take classes from server not from client m/c.
Can anybody help me to solve this problem?

If the client is created using powerj, pl cross verify the code for the lookup() in the client with component properties in the jaguar server.
check the component properties , in the installed packages of the jaguarCTS , under jaguar manager of the sybase central java edition.
kar

Applet EJB Coomunication

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