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I have a need to integrate a third-party Java applet into a custom web part I wrote. The web part simply loads a user control I created that contains the bulk of the functionality. I added the applet to my user control project and it works fine outside of my SharePoint environment.

I installed the updated web part onto my MOSS 2007 development site and the part's page loads fine. The applet is triggered by clicking a link button on the page, which runs some client-side JavaScript to start it. The problem is nothing seems to happen when I click the link. No error messages appear, and the stuff the applet is supposed to do never occurs. It's as if SharePoint is not allowing it to load. I have the .jar file as an embedded resource in my user control DLL and SharePoint fully trusts this DLL (it's deployed to the bin folder).

Is there anything special I need to do to make the applet work? Or am I going about this the wrong way?

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Got IE8? Try the developer tools to debug the javascript, see what's going down. – James Love Dec 1 '10 at 23:23
up vote 0 down vote accepted

The issue turned out to be caused by trying to load the .jar file as an embedded resource. My web part basically couldn't find it.

The solution was to create a separate non-WSS web site and store the .jar file there. After that my web part could load it without any problems and everything worked as expected.

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