What is the purpose of mvnw and mvnw cmd files

Question

When I created a Spring Boot application I could see mvnw and mvnw cmd files in the root of the project  What is the purpose of these two files

User · Accepted Answer

These files are from Maven wrapper  It works similarly to the Gradle wrapper   This allows you to run the Maven project without having Maven installed and present on the path  It downloads the correct Maven version if it s not found  as far as I know by default in your user home directory    The mvnw file is for Linux  bash  and the mvnw cmd is for the Windows environment     To create or update all necessary Maven Wrapper files execute the following command   mvn -N io takari maven wrapper   To use a different version of maven you can specify the version as follows   mvn -N io takari maven wrapper -Dmaven 3 3 3   Both commands require maven on PATH  add the path to maven bin to Path on System Variables  if you already have mvnw in your project you can use   mvnw instead of mvn in the commands

User · Answer

Command mvnw uses Maven that is by default downloaded to    m2 wrapper on the first use   URL with Maven is specified in each project at  mvn wrapper maven-wrapper properties   distributionUrl https   repo1 maven org maven2 org apache maven apache-maven 3 3 9 apache-maven-3 3 9-bin zip   To update or change Maven version invoke the following  remember about --non-recursive for multi-module projects      mvnw io takari maven wrapper -Dmaven 3 3 9    or just modify  mvn wrapper maven-wrapper properties manually   To generate wrapper from scratch using Maven  you need to have it already in PATH run   mvn io takari maven wrapper -Dmaven 3 3 9

User · Answer

The Maven Wrapper is an excellent choice for projects that need a specific version of Maven  or for users that don t want to install Maven at all   Instead of installing many versions of it in the operating system  we can just use the project-specific wrapper script  mvnw  it s an executable Unix shell script used in place of a fully installed Maven mvnw cmd  it s for Windows environment  Use Cases The wrapper should work with different operating systems such as   Linux OSX Windows Solaris  After that  we can run our goals like this for the Unix system    mvnw clean install  And the following command for Batch    mvnw cmd clean install  If we don t have the specified Maven in the wrapper properties  it ll be downloaded and installed in the folder  USER HOME  m2 wrapper dists of the system   Maven Wrapper plugin Maven Wrapper plugin to make auto installation in a simple Spring Boot project  First  we need to go in the main folder of the project and run this command  mvn -N io takari maven wrapper  We can also specify the version of Maven  mvn -N io takari maven wrapper -Dmaven 3 5 2  The option -N means    non-recursive so that the wrapper will only be applied to the main project of the current directory  not in any submodules   Source 1  further reading   https   www baeldung com maven-wrapper

User · Answer

By far the best option nowadays would be using a maven container as a builder tool  A mvn sh script like this would be enough      bin bash docker run --rm -ti    -v   pwd   opt app    -w  opt app    -e TERM xterm    -v  HOME  m2  root  m2    maven mvn

[maven] What is the purpose of mvnw and mvnw.cmd files?

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