How to run a Java applet in Apache Wicket 6.5?
Question
I am trying to run an applet in a web application using Apache Wicket. I put MyApplet.jar and the html page in the same directory but I got this error when deploying the page:
NullPointerException : An error occurred while running the application
Any help please ?? How can I track down to the point where the error happens, or what else can I try?
Thanks in advance.
My HTML page is
<html xmlns:wicket="http://wicket.apache.org/">
<body>
<wicket:extend>
<div class="intro-lead-in">Signing your Documents</div>
<applet code=wct.applet.Welcome.class
archive="MyApplet3.jar"
codebase="http://localhost:8080/wicketspringdemo"
width=550 height=300>
</applet>
</wicket:extend>
</body>
1 answers
solution1
0 2015-06-08 07:03:32
I have some experience serving applets from Wicket. It can get nasty, because there are many things that need to be setup correctly.
To tackle this kind of problem:
- Read and try to understand the stacktrace
- Check if the applet works in a applet-viewer (without embedding in HTML)
- Check if it works in a static HTML page to make sure it is a Wicket-related problem, not a java-applet-specific problem
- If it works in a static page, you can also save the page generated by Wicket and try if that works.
- Check if your java-applet-security settings allow running the applet (java-plugin console)
EDIT
This is my code (wicket 1.2, but should be upgradable)
<applet wicket:id="applet" codebase="applet"
code="nl.valuecare.PasteApplet" width="20" height="20"
archive="pasteappletsigned.jar" mayscript="mayscript"> </applet>
Where codebase is relativa path in the WAR
The mayscript is to allow java <> javascript communication.
I signed the Applet with a valid Code Signing Certificat because I need elevated permissions.
Maybe it is not allowed to use a absolute codebase?
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