Applet uses JavaComm Exception "...name can't be null"

[Michael]

I've written an applet which communicates with a MagTek Check Reader.
As a standalone applet it works fine. It breaks when I use it as an applet
in an html page. Standalone I'm using the same JDK as I am with the plugin.

I've signed the Applet.
I've configured the security policy for the plugin to allow all permissions.

------------------ java.policy -------------
grant codeBase "http://dev.caughey.com/-" {
permission java.security.AllPermission;
};
--------------------------------------------

Here is the out put from the Console window.

---------------- CONSOLE START ----------------------
Java(TM) Plug-in: Version 1.4.1_02
Using JRE version 1.4.1_02 Java HotSpot(TM) Client VM
User home directory = C:\WINNT\Profiles\mcaughey.001
Proxy Configuration: No proxy

----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
Applet.jbInt()
CheckPanel.jbInt()
name can't be null
java.lang.NullPointerException: name can't be null
at java.io.FilePermission.init(Unknown Source)
at java.io.FilePermission.<init>(Unknown Source)
at java.lang.SecurityManager.checkWrite(Unknown Source)
at sun.plugin.security.ActivatorSecurityManager.checkDelete(Unknown Source)
at
javax.comm.CommPortIdentifier.getPortIdentifier(CommPortIdentifier.java:89)
at com.epaysol.comm.CommPort.open(CommPort.java:123) <---- *** Last
Line of my code ***
at
com.epaysol.magtek.micrimage.impl.MicrImageDeviceImpl.disableImage(MicrImage
DeviceImpl.java:47)
at com.epaysol.applet.CheckPanel.initScreen(CheckPanel.java:123)
at com.epaysol.applet.CheckPanel.jbInit(CheckPanel.java:108)
at com.epaysol.applet.CheckPanel.<init>(CheckPanel.java:44)
at com.epaysol.applet.ReadCheckApplet.jbInit(ReadCheckApplet.java:45)
at com.epaysol.applet.ReadCheckApplet.init(ReadCheckApplet.java:34)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
---------------- CONSOLE END ----------------------

I have configured the plugin VM parameters with
-Djava.library.path=J:/javacomm

This is where i have installed the dll and placed the javax.com.properties
file which javacomm require.

If there is a better way to do this, I'm al ears. I hat the fact that I
have to have the user manually
modify the java.policy and place the two files on their file system.

Primarily i'm looking to get this working.

Thanks in advanced,
Michael

[subhodh]

Michael,
I also have the same kind of problem while running applet on browser. Do you got the issue resolved or you have any other solution. Please let me know if possible