If anyone is too help they might need further information e.g.

• What version of Processing are you using?
• What is your operating system?
• Are you exprting an Application or an Applet?

I'm using ver 1.5.1
OS: Windows 7
I just clicked the Export button on the IDE & that gave me a folder named " applet" inside which I browsed for the .jre file of same name as my sketch's (not the lib jres). I Haven't used any wrappers for conversion to a standalone .exe though.

For a standalone .exe then use Export Application.

If you use Export Applet then it will create an applet that can be viewed inside a web browser, so in the folder that opens double click on the index.html file.

When you talk about '.jre' file do you mean .jar files? Jar (Java Archive) files are simply compressed files (similar to zip) and they can either be runnable or not. If runnable you should be able to double click on the jar and it will cause the Applet Viewer program to start and run your applet.

I suspect that you do not have the viewer program installed on your computer. To view an applet in a browser you need a JRE (Java Runtime Enviroment) but the Applet Viewer is not included in the JRE. You need to download and install the latest version of JDK (Java Development Kit), installing the JDK will install the Applet Viewer.

I've the latest jDK1.7.0.10 installed & jRE too (Also added them to the path in Advanced Environment variables). The proof is when I type "java" or "javac" in cmd, it gives me a tree of it.  Also please try out that while using a lib in applet, it'll not run in a browser even with openGl supporting.

Basic processing applets run without any problem though & yeah I'm sorry for earlier. They were .jar files.

If you are having windows can you just try exporting any of the example sketches which uses a contributed lib & try to run the .jar file by double clicking it & let me know if that works in your system? That would really be helpful.

The jar file happens to work when no library is given, not sure why...
But to include a library, you have to do some extra work, as that jar file isn't designed for that (the jar files are specified in the applet tag of the HTML file).
Open the jar with an archive manager like 7-Zip or IZArc.
Go to the META-INF folder. There should be a MANIFEST.MF file there.
In 7-Zip, you can hit F4 (or right-click > Edit), change the file and save, it proposes to replace the file in the archive.
Otherwise, just extract it, edit it and put it back there (drag'n'drop from Explorer works).
In the MANIFEST.MF, add a line. For my test, I had:
Class-Path: core.jar ApacheCommonsCollections.jar

Of course, replace the ApacheCommonsCollections.jar with the name of the jars of your library.

After this change, the jar file becomes fully runnable.

I've WinRAR as the extractor

Well, I have only shown two files, but on one line, and with the extensions, so what do you conclude?

" what to do after saving it ?"
As said, put the file back in the jar file.

how to put/convert a folder in a .jar file. And what do you mean by this "drag n drop" here? Sorry but confused actually.

OK, the simple, massive way: put the jar in a folder. Unzip it in place (tell your archiver to keep the folders from the archive). Edit the file and save. Select all files and folders (except the jar) and zip them again. Rename the resulting file from .zip to .jar. Done.

well this problem is solved. But again only some libraries are compatible here & work while some don't like GSvideo serial & full-screen libs. ControlP5 etc. works well though