Applets

Chunks · 23-03-2004 2:15pm #1

Here is my code for an applet. It works perfectly when viewed using appletviewer, but, when I try to use it via a web explorer it doesnt load up. Why is this happening? It's driving me insane!! Any help would be great.........

leeroybrown · 23-03-2004 2:24pm

Just a shot in the dark here:

I did some applet development for a project years ago and i kept having display problems caused by browser caching (IE). I can't remember which, but I either needed to close down all browser instances or clear the cache each time I recompiled the applet.

Karoma · 23-03-2004 2:39pm

1. one thread is enough :mad:

2. check that you have the proper HTML 'code'
3. go to Tools > internet options > security tab -> internet -> custom - try lowering java vm security,etc..

Zab · 23-03-2004 2:50pm

You can usually get more information from the Java Console. You can get this from the systray icon if you are using the Sun VM, or from View->Java Console if you're using the MS VM (must be enabled in Internet Options->Advanced). If you don't understand what it is telling you, post it in this thread.

If you need IE to reload an applet from the source, rather than the cache, use CTRL-F5.

Zab.

Chunks · 23-03-2004 2:53pm

it doesnt seem to work. I'm getting a noclassDefFound error. Dont spose anybody knows how to go about fixing that?!

thanks in advance

Draupnir · 23-03-2004 2:54pm

there is a thing called HTMLviewer or something like that in the bin with javac and java and all the other programs. ya gotta run that on the applet.

Matfinn · 23-03-2004 4:32pm

I am working with chunks on this one.

We have tried everything you have told us to and no luck. Any more ideas? keep them coming and thanks for your help

Zab · 23-03-2004 5:04pm

If you're attempting to use the MS VM, you will have to compile the java file using an older version of the JDK (1.3 or before ... 1.4 will not work). The MS VM is based on the 1.1 specification, so you won't be able to use the newer classes either, meaning that even if you get it to run the class, it may complain about not being able to locate other classes.

If you don't need it to run under the MS VM, you could just enable the Sun Plugin in control panel (I'm presuming that you're using windows here?).

Draupnir · 23-03-2004 5:22pm

Hey Matfinn, bit late to be doing this now, Im guessin its your 3rd year project, Im in CA too by the way

Matfinn · 23-03-2004 5:44pm

I am. Are you doing your third year project? Have you presented it yet? how did it go?

Hobbes · 23-03-2004 5:52pm

No cogging!

Karoma · 23-03-2004 7:23pm

cogging is what FYPs are all about!
Have you tried writing and running a simple HelloWorld applet? see if that works...

Draupnir · 24-03-2004 12:25am

yeah matt presented it Monday, it went grand but the guy they had examining us caught me and my mate drinking down in L101 about 3 months ago so he may mess with our grade cos of that!!

They just ask you simple enough questions and then ask you to show them some interestin code. Its not too bad.

Raz · 24-03-2004 9:07am

Originally posted by Chunks
I'm getting a noclassDefFound error.

This means that java release being used in the browser has come accross a line of code in your applet like, JEditorPane inputPane = new JEditorPane(); and it sees you are trying to construct from a class called JEditorPane but the java release doesn't have anything on a JEditorPane.
Therefore the java release you are running the applet on is older than the one you compiled the applet on.
As said befor you can fix this in the advanced tab of internet options (again assuming you are using internet explorer).

Karoma · 24-03-2004 3:30pm

*shrugs*
it's working fine here.

Test.html:


<html><head><title>Testing</title></head>
<body>

  <applet code="ProjApp" width="1024" height="768"></applet> 

</body>
</html>

put the .html and applet in the same folder...

Check classpath and java_home mebbe?
show us your classpath (prnt scrn or 'echo %classpath%')

Chunks · 24-03-2004 4:32pm

no worries, just got it working!!!

Thanks for all your help guys

Karoma · 24-03-2004 4:34pm

no worries, just got it working!!!

how? (it might help others to know..)

Chunks · 24-03-2004 4:36pm

Raz seemed to have hit the nail on the head. I followed his advice and it worked.....cheers Raz! thanks for the ideas Karoma, appreciate it everyone!

Raz · 24-03-2004 5:30pm

You're welcome

Glad I could help.

Applets

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