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running applets

1 reply on 1 page. Most recent reply: Apr 7, 2005 11:25 AM by Amol Brid

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cBin

Posts: 13
Nickname: cbb
Registered: Mar, 2005

running applets

Posted: Apr 7, 2005 9:08 AM

I'm having trouble getting an applet to run on a computer other than my own. I wrote it in NetBeans, and it runs fine in the applet viewer. I then wrote the html file for it, and put the html file in a folder on my desktop with the .class file, and the .jar file.

I can run the applet in my web browser from this folder just by opening up the html file, and it works fine if it is on my computer, but when I try to open it on the computer at school it says "loading Java Applet Failed" on the browser, and if I open up the java console it has this error

java.lang.UnsupportedClassVersionError: BallBounce (Unsupported major.minor version 49.0)

and then a lot of errors like this
at sun.applet.AppletClassLoader.findClass(Unknown Source)

I am using JDK 5.0, could this be the problem? the version at school is:
Java(TM) Plug-in: Version 1.4.2_05
Using JRE version 1.4.2_05 Java HotSpot(TM) Client VM

I went to some sites that have java applets on them, and they open up just fine with the browser at school. Anyone know of a site which has an applet built in 5.0?

I am very confused, and unfortunatly don't have a web page to just test this on properly.

Here is my HTML:

 
<HTML>
<HEAD>
   <TITLE>Bouncing Ball Model Applet</TITLE>
</HEAD>
<BODY>
 
 
<H3><HR WIDTH="100%">Bouncing Ball Model<HR WIDTH="100%"></H3>
 
<P>
<APPLET code="BallBounce.class" 
        archive="BouncingBallApplet.jar"
        width=600 height=450></APPLET>
</P>
 
 
</BODY>
</HTML>

Any suggestions would be much apprecieated, this is driving me crazy.

Amol Brid

Posts: 43
Nickname: amolbrid
Registered: Feb, 2004

Re: running applets

Posted: Apr 7, 2005 11:25 AM

Hi,

Compile your applet code using -target option.

For compiling to VM 1.4 use the following:

javac -target 1.4 <java source file>

Other VM versions are: 1.3, 1.2, 1.1

Regards,
Amol Brid.

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