How to dump all dependencies of a maven project

Although it's not common but it really happens in real life.  Usually maven  already automatically downloads all dependencies to local repository, and for some reason you want to get some or all  dependency jar files of this project.  For example you final package is a executable...

Understand <optional>true</optional> in maven dependency

In pom's dependency , sometimes there's  <optional> true</option>. What does this mean? Why and when do you need to set this? 1. Meaning of <optional> In short, if project D depend on project C, Project C optionally depend on project A, then project D do NOT depend on project...

liquibase - helloworld example

Liquibase is a dabasebase chane management tool. Rather than writing SQL directly against the database to create, update or drop database objects, developers define their desired database changes in XML files. Any change to database are grouped into "ChangeSet", the best practice is one changeset per...