Updating file in jar

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.

We will see a bit later how these sections can really help us in controlling the properties of our archive.

Manifest file can also be updated by using the m option of jar command.

However I now have to update one of the jar files to a newer version for a bug fix, and I don't know how.

The updated jar is at I tried copying the new jar into the library folder where the other jars for the Eclipse plugin are stored and adding it to the build path of the project as an external jar (couldn't figure out how to get it in as part of the existing library) but it didn't work. Or do something with the short pom file that goes with the updated jar, like edit the original pom file on my system (which obviously covers a whole bunch of other jars) to add stuff from the short pom file, and if so which bits of the file? Probably the Number 1 selling point of Maven is that it fetches and caches dependencies for you.

Each section have two entries section name and its value.

And how do I get Eclipse to recognise the new jar instead of the older version, will deleting the old jar from the filesystem be enough? You don't have to download the updated JAR, just update the version number of the JAR in your Maven POM file and do a clean and rebuild. I'm new to this so I'll just have to go figure out how to do a clean and rebuild - if you'll forgive that it's so basic, am I right in thinking that you go to the directory where the edited POM file is and do mvn clean then mvn install, please?

When you do that, Maven will check your local repository (cache) and, if the jar hasn't already been downloaded, it will go to the maven repositories, find a copy, and download it (this is assuming you didn't do an offline build! Then it will use that copy to do your new build with.

The letters m, f and e must appear in the same order that The jar tool combines multiple files into a single JAR archive file.

jar is a general-purpose archiving and compression tool, based on ZIP and the ZLIB compression format.


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