This maven plugin is responsible to create a Fat JAR bundle containing all the dependencies specified in a POM file. Sometimes users need to unpack specific dependency (eq. zip, tar etc) before packing the dependency as this dependency could contain other jar files. The primary motive is to collect all the dependencies including the plain jar dependencies and the other jar dependencies that reside in other dependency (eq. zip, tar etc). Apart from this, it could also update the versions of the specified dependencies before wrapping in a big fat JAR bundle. This internally uses bnd to wrap all the dependencies in a single fat JAR.