JApplet works in applet viewer, not in HTML page

StackOverflow https://stackoverflow.com/questions/9505367

Question

This topic has been covered in one form or another but none of the other threads have been able to help. My issue is very similar to this post, I am making a JUNG graph with added functionality, but none of the solutions helped:

JApplet fails to run in HTML page

I had a Java application that I converted to a JApplet. The JApplet works fine in the applet viewer in Eclipse but will not work when I try to open it in a webpage (I have tried IE, FireFox, and Chrome). I have my HTML page and archive folder both in the same directory. When I load the HTML page it just brings up nothing.

Here is my html code:

<html>
<title>Applet</title>
<head>

</head>
<body>

<applet code="prerna.blueprint.main.BPTester.class" 
        archive="applet1.jar"
        width="800" height="800">
</applet>

</body>
</html>

When I try to have code="BPTester.class" it gives java.lang.ClassNotFoundException: BPTester.class but when I use code="prerna.blueprint.main.BPTester.class" it gives me no errors just nothing happens. (prerna/blueprint/main/BPTester.class is the file path in my src folder). I exported my Java project as a runnable jar file, is this correct? I created a simple JApplet that worked fine when I did all the same steps but it won't work for BPTester.class.

If I need to post my BPTester.class code I can.

I don't understand why I can't view the JApplet in a webpage, any help is greatly appreciated.

Was it helpful?

Solution

What ended up working for me was adding every single jar I used in the japplet to the HTML archive tag then had to sign every jar. I then had an issue with accessing my database within the applet1.jar so I just put an absolute path for its location.

OTHER TIPS

java.security.AccessControlException: access denied (java.util.PropertyPermission user.dir read)

The applet needs to be digitally signed (by you) and trusted (by the end user, when prompted) before it can obtain such information. Given this applet is being deployed using a traditional applet element (i.e. not using web start), all jars need to be signed.

You need to sign every jar. You can sign all the jars with the jarsigner utility. Example:

jarsigner.exe "nameofthejar.jar" "alias"

Remove .class from the end. You either use a file path with slashes and .class at the end or you only use periods and no .class at the end.

Try turning on tracing in the java control panel. It will then produce a log file in the following path that may help: %USERPROFILE%\AppData\LocalLow\sun\java\Deployment\log

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