Plugin hangs while reading an applet

Question

Hi AIl,
I'm trying to read a wrl file in java3d and create a plugin for that,but the plugin hangs while reading the applet and the java console displays the following error message.
Please give some suggestions.
Java(TM) Plug-in: Version 1.3.1
Using JRE version 1.3.1 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\dk27
Proxy Configuration: no proxy
Warning: default mime table not found: D:\JDK13~1.1\lib\content-types.properties
security properties not found. using defaults.
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
q: hide console
s: dump system properties
t: dump thread list
x: clear classloader cache
0-5: set trace level to <n>
java.lang.ExceptionInInitializerError: java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
     at java.security.AccessController.checkPermission(AccessController.java:399)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
     at sun.applet.AppletSecurity.checkAccess(AppletSecurity.java:139)
     at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:279)
     at java.lang.ThreadGroup.getParent(ThreadGroup.java:140)
     at javax.media.j3d.MasterControl$23.run(MasterControl.java:3077)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.media.j3d.MasterControl.<clinit>(MasterControl.java:3070)
     at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:206)
     at Vrml2.init(Vrml2.java:116)
     at sun.applet.AppletPanel.run(AppletPanel.java:344)
     at java.lang.Thread.run(Thread.java:484)

Answer 1

Warning: default mime table not found: D:\JDK13~1.1\lib\content-types.properties
security properties not found. using defaults.This is just a warning message -- probably not the cause the problem.
java.lang.ExceptionInInitializerError: java.security.AccessControlException: access denied
(java.lang.RuntimePermission modifyThreadGroup)This is the problem....the way it looks ot me, you'll have to use something like policytool to add the following target names to the RunTime Permissions:
modifyThread
modifyThreadGroup
If you don't know how to do that, check out the Tutorial on Security or type policytool in the upper right corner of this page and click search.
Good Luck!
V.V.