NullPointerException on getParameter method

[cold80]

I'm trying to get a parameter for my applet from the a web page but I
always receive a NullPointerException. I'm developing with JBuilder,
and debugging the code I can see the line:

this.getParameter("ProxyURL")

thorws this exception. I've tried this line of code in the applet
constructor and the the jbInit method of the applet, but I get always
the same result. I'm sure the name of the parameter is correct, and I
have tried the applet with JBuilder and with a stand-alone web page
too. What can I do?

Many thanks

Cold

 

[Andrew Thompson]

I'm trying to get a parameter for my applet ..

[1] Code?

..from the a web page ..

[2] URL?

..but I
always receive a NullPointerException. I'm developing with JBuilder,

Does it work when you use the command line and a browser?

..and debugging the code I can see the line:

this.getParameter("ProxyURL")

thorws this exception. I've tried this line of code in the applet
constructor and the the jbInit method of the applet,

<pointedly>
What 'jbInit' method?

...but I get always
the same result. I'm sure the name of the parameter is correct, and I
have tried the applet with JBuilder and with a stand-alone web page
too. What can I do?

Supply [1] & [2].

 

[Thomas Fritsch]

I'm trying to get a parameter for my applet from the a web page but I
always receive a NullPointerException. I'm developing with JBuilder,
and debugging the code I can see the line:

this.getParameter("ProxyURL")

thorws this exception. I've tried this line of code in the applet
constructor and the the jbInit method of the applet, but I get always
the same result. I'm sure the name of the parameter is correct, and I
have tried the applet with JBuilder and with a stand-alone web page
too. What can I do?

Many thanks

Cold

Don't do any applet initialization in the applet constructor, like
calling this.getParameter(...) or jbInit(), because the applet is not
completely initialized then. (To be more precise: the
browser/appletviewer didn't call setStub(...) of your applet yet, and
therefore several applet methods throw a NullPointerException.)

Instead, do these things in the init() method.
BTW: Your JBuilder should have generated the jbInit() call inside the
init() method. Keep it that way.