AccessControlException & Reflection ...

Question

Hi all,
I have an extremely strange error with my Applet. I have a signed Applet that loads a bunch of GUI components using a custom class loader. That all works fine. In fact, the following works and is tested:
- Signed applet tested and works
- Class loader loading classes
- Invocation of methods on objects from the custom class loader
The weird thing is when more than about 2-3 seconds passes and an event handler calls up an invocation on a Method object, I get the following error:
Caught exception:
InvocationTargetException
printing the excepiton's cause (via the getCause() method) reports:
java.security.AccessControlException: access denied (java.net.SocketPermission localhost:80 connect, resolve)
Like I say, if I quickly keep clicking on things in the Applet it's all good. But if I do not click on a component within about 2-3 seconds, the above error is given. Some sort of time out is taking place but I'm not sure on what. I'm confused since I the Applet is signed and has been accepted.
Any help would be most appreciated.

Answer 1

connection.setReadTimeout(readtimeout);
Method setreadtimeout =
connection.getClass().getMethod("setReadTimeout", new
Class[]{int.class});In my applet, the first line of code above succeeds,
but the second fails with an exception as follows:
java.security.AccessControlException: access
denied (java.lang.RuntimePermission
accessClassInPackage.sun.net.www.protocol.http)
at
t
java.security.AccessControlContext.checkPermission(Unk
nown Source)
at
t
java.security.AccessController.checkPermission(Unknown
Source)
at java.lang.SecurityManager.checkPermission(Unknown
n Source)
at
t
java.lang.SecurityManager.checkPackageAccess(Unknown
Source)
at
t
sun.applet.AppletSecurity.checkPackageAccess(Unknown
Source)
at java.lang.Class.checkMemberAccess(Unknown
n Source)
     at java.lang.Class.getMethod(Unknown Source)
     at GTunnel.setReadTimeoutIfImpl(GTunnel.java:93)
     at GTunnel.open(GTunnel.java:139)
     at GTunnel.close(GTunnel.java:356)
     at Viewer.closeConnection(Viewer.java:576)
     at Viewer.close(Viewer.java:1144)
     at Viewer.doMessageLoop(Viewer.java:1098)
     at Viewer.run(Viewer.java:1118)I can use reflection to get methods of other objects
in java.net, but not URLConnection. I am using
reflection to allow our java applet to run on pre 1.5
versions of java that do not implement
setReadTimeout.
In my case the URLConnection is an
HttpURLConnection.
This works when I debug under eclipse.
Is there any way around this?Did you properly sign the Applet?
(T)