Re: Applet cannot read PARAM values: security exception

Knute Johnson <>
Sat, 01 Mar 2008 10:28:04 -0800
VK wrote:

That was a while ago when I last time worked with Java, so I might be
missing some recent security development. Any way:

Having a simple applet with hardcoded params it runs just fine on the
latest Java Plug-in 1.6.0_04 in both IE and Fx. If I put params into
PARAM tags then on getParameter it gives me SecurityException and
"Applet notinited" - the orthography is from plugin makers - in the
browser status bar. Is PARAM usage for applet is now locked? How do
workaround it then?

The applet in question is as simple as:

import java.awt.*;
import java.applet.*;

public class SockeR extends Applet {

 public void init() {
   // this works just fine, applet gets red:
   // using this instead of the above leads to error:
   //Color.getColor(this.getParameter("bgcolor"), Color.white)

 public void start() {

 public void stop() {

 public void destroy() {

 public void paint(Graphics g) {

 public String getAppletInfo() {

Your problem is in trying to read the System properties not applet
parameters. I don't think this method has any use because, on my system
at least, there are no color values in the System properties. I don't
know if they were removed at some point or what. Use a decimal or hex
number and create your color with that instead of the string name. The
Color.decode() ought to be very useful here.


Knute Johnson
email s/nospam/knute/

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