Wierd problem with web start in windows 7

I have a wierd problem with my web start app in windows 7, it just hang it self. it work fine in windows XP and Vista.
The wierd thing is that i can open the app but when i press on a specific button that will make a jlabel present a .png image everthing crash. why do i get this problem now? when i start the app, i load some pic i jlabels and that seems to work fine, but when i do it under the exection it seems to crash, why?
Should i do something different to make the app work in windows 7?
I hope someone can help me out!!

You should:
a) open the console (java control panel, advanced options) and see the stackTrace (if any). If it's not there check for swallowing.
b) post a code snippet, to at least show how and where you retrieve the png. Possibly a SSCCE.
c) check if this happens also running as a standalone app (may be more Swing-related than JWS-related).
Bye.

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Best Regards
David

Has anyone used Java Web Start to load application? I
have given all-permissions to the application when
loaded and also give the AllPermission in
Policy.setPolicy() inside the code. I encountered the
following problems right now.
(1) In the application, I want to connect another
server (different from the web server where I load the
application), and get the following error (looks like
that I cannot ping other server):
com.esri.mo.client.io.UnableToPingEsrimapException:
Unable to ping ESRIMAP
(2) I create local directory, connect to database, use
the return results to create some corresponding local
files and load the local files in the Swing component,
but it just cannot load. Here is the error message:
java.security.AccessControlException: access denied
(java.io.FilePermission C:\Documents and
Settings\ABC\Desktop\.\shpdir read)
I believe all these problems are resulted from
security. But I have set the permission and policy
already, so any solutions are highly appreciated!
Best Regards
DavidHello David,
If you want to use local files(R&W) then you have to set the following lines the .jnlp file like this:
<security>
<all-permissions/>
</security>Now if you assign all permission then you have to make jar file signed.(you can use jarsigner tools provided with the jdk_1.4.* to make the jar file signed).
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Hi Jim,
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Regards
Leo

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