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There are two main techniques that you can use to do this.

The first technique is to use the "-cp" or "-classpath" switch on "javac" and "java" to set the classpath.

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.

When setting the classpath, on Windows you can separate the different locations with semicolons, and on unix you can separate the different locations with colons. At the command prompt in the C:\stuff directory, I can type the following to compile the file.

If I didn't include commons-lang in the classpath, I'd get a compilation error since the java compiler wouldn't know what String Utils is, since it wouldn't know where to find it. In order to execute this class, we need to supply the classpath referencing commons-lang-2.3to the java interpreter so that it knows what to do when the String Utils.replace() method is called.

When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.Now they made some changes to a certain jar file ... You'd basically just unpack it, and then you'd decompile the classes inside it, and then you'd update the file, and then recompile the source code files and repackage it into a new jar. Do you mean that you want a running program to alter the jar file that it's deployed in? It's a huge pain in terms of ongoing maintenance if the jar file you deploy isn't the same jar file that the user has after a month of using the program. If you have a restricted list of classes which will be loaded from the jar, and loading those classes from the jar doesn't happen too often, then it can be done.Hi, I've been working on an application, a sort of a test engine. I'm trying to create some feature that the program will do automatic updates for itself. During the run time, I let the program download an updated jar file at some point, with different name, say, append a '_TMP' at the end, which is to avoid directly overwriting the current used jar file, which ... (I have a working example here.) Basically, every time you want to create an instance of a class from the jar, you create a new classloader based on the (latest ...I know that this is architecturally wrong, but my application has to be a single jar. Dear Folks, I know I am being a pain in the a** with my incessant questions today, but I appear to have a strange problem here.I am trying to make several changes to a GUI-based chat program which previously ran perfectly.

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