Solved

Applet not running for most users

Posted on 2003-11-20
9
381 Views
Last Modified: 2010-03-31
I recently entered the world of applet creation. My applets run just fine on my machine, and on several friends' machines. However, for the vast majority of users, apparently regardless of OS and browser, they do not work.

I'm compiling my applet using Sun's JDK, and I've tried versions 1.2.2, 1.3.1_05, and 1.4.0_03. It doesn't seem to make any difference. Note that most users who CAN see my applet, are in the same Comp Sci classes as me, and have installed Sun's JDK themselves.

I created a version of my page that prompts users to download the JRE, and if they download it, all my applets DO work. However this is a huge hassle for users and it seems like it should be unnecessary; there's an awful lot of applets online that already work for nearly all users without requiring that download.

Should I be using a different compiler/different SDK? Perhaps different compiler options? I've already told the compiler to target an earlier version, and that didn't make any difference.
0
Comment
Question by:Sowelu
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 3
9 Comments
 

Author Comment

by:Sowelu
ID: 9792010
Some clarification:
For users that the applet does not run, they get the error "load: class RunAlpha not found", where RunAlpha is my class. They get a grey box in place of the applet. Of course, the class does exist, and people with the JRE can load it. Apparently this is Java's standard "I don't like that file" error message.
I have attempted to compile under jdk1.1.8 but my program will not compile with it, I need features from later versions.
0
 
LVL 35

Accepted Solution

by:
TimYates earned 150 total points
ID: 9792020
You need to ensure you aren't using any of the Java 1.2+ things when you create your applet

then compile it with -target=1.1

Basically, no ArrayLists, Iterators, Graphics2D, etc...

Or...you can download the old 1.1 JDK, and compile your applet with that (fixing it so it compiles for 1.1)

http://java.sun.com/products/archive/index.html
(you want http://java.sun.com/products/archive/jdk/1.1.8_010/index.html)

Basically, IE ships with 1.1 (or nothing under XP)...  in the case of XP, they will have to download the plugin...  In other cases, compiling as a properly compliant 1.1 applet should work...

If you can, it's probably worth getting users to download the JRE (plugin), as then you can use the new nicer functions in your applets (and graphics looks nicer)...

Or maybe supply them with a CD containing the plugin?
0
 
LVL 92

Expert Comment

by:objects
ID: 9792023
> I have attempted to compile under jdk1.1.8 but my program will not compile with it,
> I need features from later versions.

Then users will also need the plugin to run it.
The MS VM only supports 1.1.

Alternatively remove use of >1.1 features from your applet.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 35

Expert Comment

by:TimYates
ID: 9792030
> but my program will not compile with it, I need features from later versions.

In that case, people are going to have to install the plugin...

As I said, there are 2 options

1)  Make your code 1.1 compliant
2)  Make the users download the plugin

(2) is probably the better choice, as the user will get a more complete, smoother looking applet...  and they should only have to download the plugin about once a year (at most) ;-)

Tim
0
 

Author Comment

by:Sowelu
ID: 9792056
Ah, okay. When I tried to compile under 1.1, it was exactly those ArrayLists that kept it from compiling. I don't need them in my program and I'm sure it's better off without them.

Unfortunately, since this is just an app I'm doing for fun, distributing a CD with the plugin isn't really an option... But if it's necessary to use >1.1 stuff, at least now I know that's what's wrong.

Thanks!
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9792063
> I don't need them in my program and I'm sure it's better off without them.

You can use Vector...it is similar :-)
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9792065
Good luck!

Tim
0
 

Author Comment

by:Sowelu
ID: 9792099
Just managed to test it on an old machine and it DOES work when compiled for 1.1. Thanks again.

Once again, I learn that college does not truly prepare a person for the real world! ;)
0
 
LVL 35

Expert Comment

by:TimYates
ID: 9795609
>  learn that college does not truly prepare a person for the real world!

:-)

It's a very good start though :-)
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question