mvn clean install vs. deploy vs. release
I am just learning maven, and we have recently needed to go more and more. I would like to know the difference between
mvn clean install
mvn release
mvn deploy
Please be as descriptive as possible.
Answer
The clean, install and deploy phases are valid lifecycle phases and invoking them will trigger all the phases preceding them, and the goals bound to these phases.
mvn clean install
This command invokes the clean phase and then the install phase sequentially:
clean: removes files generated at build-time in a project's directory (targetby default)install: installs the package into the local repository, for use as a dependency in other projects locally.
mvn deploy
This command invokes the deploy phase:
deploy: copies the final package to the remote repository for sharing with other developers and projects.
mvn release
This is not a valid phase nor a goal so this won't do anything. But if refers to the Maven Release Plugin that is used to automate release management. Releasing a project is done in two steps: prepare and perform. As documented:
Preparing a release goes through the following release phases:
- Check that there are no uncommitted changes in the sources
- Check that there are no SNAPSHOT dependencies
- Change the version in the POMs from x-SNAPSHOT to a new version (you will be prompted for the versions to use)
- Transform the SCM information in the POM to include the final destination of the tag
- Run the project tests against the modified POMs to confirm everything is in working order
- Commit the modified POMs
- Tag the code in the SCM with a version name (this will be prompted for)
- Bump the version in the POMs to a new value y-SNAPSHOT (these values will also be prompted for)
- Commit the modified POMs
And then:
Performing a release runs the following release phases:
- Checkout from an SCM URL with optional tag
- Run the predefined Maven goals to release the project (by default, deploy site-deploy)