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java newbie - applet code works in appletviewer, not in IE

  • jannin
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Post June 4th, 2004, 10:20 am

Hi all,
I've just begun to learn Java and got some super simple codes just to try it out. At the moment I've just got one of those great little "hello world" scripts. One of them is Hello.html (calls the applet) the .java file is HelloWorld.java. I compiled it (HelloWorld.class) with javac, and it works fine when I run it through appletviewer (downloaded from Sun, as with the compiler, etc etc) but if I try to run it in IE (6.0) the status bar tells me "load: class HelloWorld not found" and gives me that nice little grey box.

Like I said, complete newbie, not sure if it's the code, or IE, or what. Here are both the html and java files, and again, thanks for the help!

Hello.html:
Code: [ Select ]
<HTML>
<HEAD>
<TITLE>A Simple Program</TITLE>
</HEAD>
<BODY>
Here is the output of my program:
<APPLET CODE="HelloWorld.class" WIDTH=150 HEIGHT=25>
</APPLET>
</BODY>
</HTML>
  1. <HTML>
  2. <HEAD>
  3. <TITLE>A Simple Program</TITLE>
  4. </HEAD>
  5. <BODY>
  6. Here is the output of my program:
  7. <APPLET CODE="HelloWorld.class" WIDTH=150 HEIGHT=25>
  8. </APPLET>
  9. </BODY>
  10. </HTML>


HelloWorld.java:
Code: [ Select ]
import java.applet.*;
import java.awt.*;

/**
* The HelloWorld class implements an applet that
* simply displays "Hello World!".
*/
public class HelloWorld extends Applet {
  public void paint(Graphics g) {
    // Display "Hello World!"
    g.drawString("Hello world!", 50, 25);
  }
}
  1. import java.applet.*;
  2. import java.awt.*;
  4. /**
  5. * The HelloWorld class implements an applet that
  6. * simply displays "Hello World!".
  7. */
  8. public class HelloWorld extends Applet {
  9.   public void paint(Graphics g) {
  10.     // Display "Hello World!"
  11.     g.drawString("Hello world!", 50, 25);
  12.   }
  13. }


Thanks!
/jannin
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Post June 4th, 2004, 10:20 am

  • _nYght
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Post June 4th, 2004, 7:34 pm

HI jannin, i copy your code and compile, and probe on mozilla 1.4 for windows and iexplorer in a winxp pro, and it works fine, many posible reasons is you don't have correctly configured your classpath or correctly instaled the jre and the java plugin .Check if you have the classpath environment variable correctly redirected to the lib directory of your jsdk

for example the mine is
Code: [ Select ]
.;C:\Program files\j2sdk_nb\j2sdk1.4.2\lib


and check the config of the explorer for java settings, in the java plug in panel and in Internet Options-> Advanced Options -> an check the box to use the sun java plug in ;)
  • jannin
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Post June 4th, 2004, 8:00 pm

Okay...
Thanks nyght,
Here's what I discovered:
I know I have java capabilities in IE, etc etc, because I can view other java files. Also, I know that I can view java files that I have on my computer, because I downloaded an already compiled .class file, created an applet and ran it both in appletviewer and in IE. This kind of leads me to think it's the compiler, but then why will the other .java files I've compiled run in appletviewer?

/jannin
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Post June 4th, 2004, 8:08 pm

I remember helping with a similar problem awhile back:

http://www.ozzu.com/programming-forum/problems-loading-page-t20942.html

For whatever reason the applet wouldn't work in IE (same result as you have) until I installed the J2RE and used it in IE instead of the Microsoft Virtual Machine.

Hope that helps.
"There's no place like 127.0.0.1 except for ::1."
Alexandria Networks. Leader in IT consulting for associations/non-profits, and small to medium sized businesses around the northern Virginia and Washington D.C. metro area.
  • jannin
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Post June 9th, 2004, 8:12 pm

Thanks ATNO, and sorry for the slow reply.

Checked out the J2RE, but haven't downloaded yet: if I download it and get something to work, what happens when visitors to my site try to view the applet? It wouldn't work unless they've downloaded the J2RE as well, right?

/jannin
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Post June 9th, 2004, 8:28 pm

correct
"There's no place like 127.0.0.1 except for ::1."
Alexandria Networks. Leader in IT consulting for associations/non-profits, and small to medium sized businesses around the northern Virginia and Washington D.C. metro area.
  • jannin
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Post June 10th, 2004, 6:48 am

Alrighty then.
I'll have to think about it I guess. Thanks for your help!

/jannin

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