Re: Changing Java Security Policy

"Andrew Thompson" <>
23 Mar 2007 06:58:32 -0700
On Mar 23, 11:24 pm, Tom Hawtin <> wrote:

Andrew Thompson wrote:

On Mar 23, 10:50 pm, "CalAmity!" <> wrote:

..Can I change the security policy from within a java
program ??

Here is an example of replacing the current
security manager with one that is more strict..


And here's an example of the opposite...

I only checked one of the URL's, but all I
saw was an *assertion*. The assertion was
that this line of code..
...could be called from within an applet to
remove the security manager.

OK - lets turn that into a simple *example*.

import java.applet.Applet;

public class NoSecurityApplet extends Applet {
  public void init() {
    try {
      System.out.println("java.version: " +
        System.getProperty("java.version") );
    } catch(Throwable t) {

Both AppletViewer and IE produced similar
results, here is the output from AppletViewer.

java.version: 1.6.0 access denied
   at java.lang.SecurityManager.checkPermission(
   at java.lang.System.setSecurityManager0(
   at java.lang.System.setSecurityManager(
   at NoSecurityApplet.init(

So. I feel fairly confident in calling
that assertion 'a load of old cobblers'.
If it was a security bug in some obscure
old version of the JVM - it has apparently
been fixed* (as I would have expected).

( * Fortunately, to spare us the the idiotic
games of people like this foul mouthed OP. ;)

Andrew T.

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