Download JAR applet

Posted on 2004-09-17
Medium Priority
Last Modified: 2010-04-07

I have created a simple applet - 3 class file as long as an html to invoke it, which seems to work fine. I am now working on the download part, I was able to download the 3 class file and 1 html locally and run from there successfully, but I hope to JAR 3 class file and distribute the JAR along with the HTML. However I had problem after I downloaded the JAR and HTML, "ERror notinit applet". I did some research and found out the JAR has to be signed in order for somebody to use it. Do I have to do it?

I donot want to use ZIP to distribute it since it will require user has WINZIP installed.

Question by:pwang1973
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Accepted Solution

COBOLdinosaur earned 800 total points
ID: 12092492
The signing requirment is necessary to protect users and the networks users are on.  If you are not prepared to work within normal security requirments, then don't development componnents that hae a potential to deliver malicious content.

If you want to do thing right this page fromt eh sin site should help work through the security issues:



Author Comment

ID: 12105150
Thanks for the reply,

howver after I download the .jar and the startup.html, I got a error the applet not inited, it seems that it cannot access the class in the jar file, after I download the class file, everything seems fine. What's happening?


Author Comment

ID: 12106242
Attached the error msg, I put the jar into the same directory of the HTML, however it cannot find.

load: class SpreadSheet.class not found.

java.lang.ClassNotFoundException: SpreadSheet.class

      at sun.applet.AppletClassLoader.findClass(Unknown Source)

      at java.lang.ClassLoader.loadClass(Unknown Source)

      at sun.applet.AppletClassLoader.loadClass(Unknown Source)

      at java.lang.ClassLoader.loadClass(Unknown Source)

      at sun.applet.AppletClassLoader.loadCode(Unknown Source)

      at sun.applet.AppletPanel.createApplet(Unknown Source)

      at sun.plugin.AppletViewer.createApplet(Unknown Source)

      at sun.applet.AppletPanel.runLoader(Unknown Source)

      at sun.applet.AppletPanel.run(Unknown Source)

      at java.lang.Thread.run(Unknown Source)

Author Comment

ID: 12106661
Caused by: java.io.FileNotFoundException: d:\ucdg_estim\SpreadSheet\class.class (The system cannot find the path specified)

      at java.io.FileInputStream.open(Native Method)

      at java.io.FileInputStream.<init>(Unknown Source)

      at java.io.FileInputStream.<init>(Unknown Source)

      at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)

      at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)

      at sun.applet.AppletClassLoader.getBytes(Unknown Source)

      at sun.applet.AppletClassLoader.access$100(Unknown Source)

      at sun.applet.AppletClassLoader$1.run(Unknown Source)

      at java.security.AccessController.doPrivileged(Native Method)

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