How is mvn clean install different from mvn install

Question

What is the difference between mvn clean install and mvn install

User · Accepted Answer

clean is its own build lifecycle phase  which can be thought of as an action or task  in Maven  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

User · Answer

Ditto for  Andreas D  in addition if you say update Spring from 1 version to another in your project without doing a clean  you ll wind up with both in your artifact  Ran into this a lot when doing Flex development with Maven

User · Answer

You can call more than one target goal with maven  mvn clean install calls clean first  then install  You have to clean manually  because clean is not a standard target goal and not executed automatically on every install   clean removes the target folder - it deletes all class files  the java docs  the jars  reports and so on  If you don t clean  then maven will only  do what has to be done   like it won t compile classes when the corresponding source files haven t changed  in brief    we call it target in ant and goal in maven

User · Answer

Maven lets you specify either goals or lifecycle phases on the command line  or both   clean and install are two different phases of two different lifecycles  to which different plugin goals are bound  either per default or explicitly in your pom xml  The clean phase  per convention  is meant to make a build reproducible  i e  it cleans up anything that was created by previous builds  In most cases it does that by calling clean clean  which deletes the directory bound to   project build directory   usually called  quot target quot

User · Answer

To stick with the Maven terms     clean  is a phase of the clean lifecycle   install  is a phase of the default lifecycle   http   maven apache org guides introduction introduction-to-the-lifecycle html Lifecycle Reference

[java] How is "mvn clean install" different from "mvn install"?

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