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I have eclipse ide with m2e plugin, maven and weblogc app server running from my local box.
I have imported someone else's multiple maven projects from bitbucket to my box. I was told that one of them is main and rest are dependencies in which I never seen anything like that before. I have always dealt with single maven project. Anyhow from the instruction, it says I have to run maven command such as "clean install -U".
In the IDE so I touched run configuration for each mvn project by setting goal as "clean install -U". By reading maven guide, I kind understand what each term means but when you combine together with a passing parameter, what does it do actually? I didn't expect a jar (web app) to be deployed to an application server but it did also.
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The Maven Clean Plugin, as the name implies, attempts to clean the files and directories generated by Maven during its build. While there are plugins that generate additional files, the Clean Plugin assumes that these files are generated inside the target directory.
mvn clean install tells Maven to do the clean phase in each module before running the install phase for each module. What this does is clear any compiled files you have, making sure that you're really compiling each module from scratch.
On Maven, each time you want to compile, the best practice is to run mvn clean . It clears out the existing classes that you compiled from last compile. If you don't want to run 3 lines, just do "mvn test" after mvn clean . You don't have to always do mvn compile .
Maven is written in Java and is used to build projects written in C#, Scala, Ruby, etc. Based on the Project Object Model (POM), this tool has made the lives of Java developers easier while developing reports, checks build and testing automation setups.
-U forces maven to check any external dependencies (third party dependencies) that might need to be updated based on your POM files.
clean install are both basic maven lifecycle phases (https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html).
install normally would simply take the artifact that is built and put it in the local repository, i.e. a directory on the box you are building on (.m2 directory most of the time). It would not do a deployment to a server - typically the deploy phase would be used to do that.
However, developers can override and add to what maven does in the various phases, so just like in the days of ant things can easily devolve into chaos no one can understand on complex projects ;-).
sometimes in the integration-test phase, developers will tell maven to start up a container temporarily to run the web app on, so that tests can be run against it, and then that container is shut down when the integration-test phase completes.
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