Updating the manifest mf

Let's see why you would want to read attributes from manifest files, and how it works on a low level.When you package a library or even a web application, it is a good practice to add an attribute to its In runtime, you can show these values to the user to help him understand which version of the product he is working with at any given moment. At the bottom of its front page, you see the version number and Git hash.

MF is supposed to be updated automatically to reflect the contents of included web and EJB modules in the project.

I tried to update the jar file with the new manifest file, but the manifest was not added to the jar file.

Here is the command I used: jar uf META-INF/MANIFEST.

By default, these jar files are converted to automatic modules whose names are based on the filename of the jar file. Many jar filenames have been created without any attempt to make the names globally unique.

So it is very likely that, when the developers responsible for maintaining some commonly used jar actually convert that jar to a Java 9 module, they’ll choose a different module name than the one automatically chosen for a previous non-module version of their jar. All of the other subprojects consume that module on the classpath.

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Since Java 9 module jars can be consumed equally well from the classpath or the module path, we can convert a single leaf-node in our multi-project build to produce a Java 9 module, but use that module jar on the classpath when compiling or running projects which consume the outputs of that node.

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