cannot open applet in firefox

[Phone Myat Kyaw]

Hi,

I can't test my applet programs in Firefox though it can run using appletviewer in cmd prompt or Netbeans IDE.

 Java Plug-in 1.6.0_11
Using JRE version 1.6.0_11 Java HotSpot(TM) Client VM
User home directory = C:\Users\mgph
----------------------------------------------------
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
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------


java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkExit(Unknown Source)
	at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
	at BuildBoard.<init>(BuildBoard.java:39)
	at GoGameJApplet.init(GoGameJApplet.java:20)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkExit(Unknown Source)
	at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
	at BuildBoard.<init>(BuildBoard.java:39)
	at GoGameJApplet.init(GoGameJApplet.java:20)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkExit(Unknown Source)
	at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
	at BuildBoard.<init>(BuildBoard.java:39)
	at GoGameJApplet.init(GoGameJApplet.java:20)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
load: class WelcomeApplet.class not found.
java.lang.ClassNotFoundException: WelcomeApplet.class
	at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\Projects\HTP 6\WelcomeApplet\class.class (The system cannot find the path specified)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(Unknown Source)
	at java.io.FileInputStream.<init>(Unknown Source)
	at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
	at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
	at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
	at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
	at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	... 7 more
Exception: java.lang.ClassNotFoundException: WelcomeApplet.class
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkExit(Unknown Source)
	at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
	at BuildBoard.<init>(BuildBoard.java:39)
	at GoGameJApplet.init(GoGameJApplet.java:20)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
	at java.security.AccessControlContext.checkPermission(Unknown Source)
	at java.security.AccessController.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkPermission(Unknown Source)
	at java.lang.SecurityManager.checkExit(Unknown Source)
	at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
	at BuildBoard.<init>(BuildBoard.java:39)
	at GoGameJApplet.init(GoGameJApplet.java:20)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)  

I think it's caused by Security reason because the class I'm testing uses "/images" folder from its current direction. When I test simple programs like HelloWorld.class, it's fine.
Hence, can someone advise how I can give assessment to use its subfolder to be displayed in browser/appletviewer ?

thanks in advance

[Ulf Dittmer]

There may be more than one causes for the exceptions, but start with this one:

Caused by: java.io.FileNotFoundException: C:\Projects\HTP 6\WelcomeApplet\class.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)

Applets can't use file I/O due to security reasons. To access files on the server you need to go a somewhat more complicated route. The http://faq.javaranch.com/java/CodeBarnApplets page has an example of how to do that; it's called HelloServerFile. It uses readers instead of the streams you're using, but you should have little problems rewriting it.