Updating file in jar

The structure of the app is something like this - Test (All the classes needed to run the app) | | (Some text files, from which the questions and answers are read) Reading from the jar files is no problems. Ok, please bear with me, as it is kind of late and I might not be able to explain this as well as I could :rolleyes: Right, now I know basic Java (All self taught) Arrays, Variables, File IO, little bit of Sockets, Swing, ect. During the installation we need to update the jnlp file inside war file, with some properties which user gives.

and these properties will be used on the client side. Iam trying to update a jar file programatically through java. I have a WAR file that contains a couple of JAR files, one of which has a properties file that needs to be updated before deploying the app.

The Java™ Archive (JAR) file format enables you to bundle multiple files into a single archive file.

I am trying to make several changes to a GUI-based chat program which previously ran perfectly.

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IOException: Error in writing existing jar file at sun. Main.main(Main.java:899) What does this error mean? I have created a jar file and when I type : jar uf *.properties I get this error. I didn't see any other process using it but when I restarted my machine it worked.

The JAR file format provides many benefits: This lesson has four sections: This section shows you how to perform basic JAR-file operations, and how to run software that is bundled in JAR files.

This section explains manifest files and how to customize them so you can do such things as seal packages and set an application's entry point.

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