Environment Variable with Maven

Question

I ve ported a project from Eclipse to Maven and I need to set an environment variable to make my project work   In Eclipse  I go to  Run -  Run configurations  and  under the tab  environment   I set  WSNSHELL HOME  to the value  conf    How can I do this with Maven   Thank you very much

User · Answer

For environment variable in Maven  you can set below   http   maven apache org surefire maven-surefire-plugin test-mojo html environmentVariables http   maven apache org surefire maven-failsafe-plugin integration-test-mojo html environmentVariables   lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-failsafe-plugin lt  artifactId gt               lt configuration gt           lt includes gt                           lt  includes gt           lt environmentVariables gt               lt WSNSHELL HOME gt conf lt  WSNSHELL HOME gt           lt  environmentVariables gt       lt  configuration gt   lt  plugin gt

User · Answer

You can just pass it on the command line  as mvn -DmyVariable someValue install   Update  Note that the order of parameters is significant - you need to specify any options before the command s    Update  Within the POM file  you may refer to system variables  specified on the command line  or in the pom  as   myVariable   and environment variables as   env myVariable    Thanks to commenters for the correction   Update2 OK  so you want to pass your system variable to your tests  If - as I assume - you use the Surefire plugin for testing  the best is to specify the needed system variable s  within the pom  in your plugins section  e g   lt build gt       lt plugins gt                       lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-surefire-plugin lt  artifactId gt                               lt configuration gt                                       lt systemPropertyVariables gt                       lt WSNSHELL HOME gt conf lt  WSNSHELL HOME gt                   lt  systemPropertyVariables gt               lt  configuration gt           lt  plugin gt                   lt  plugins gt   lt  build gt

User · Answer

The -D properties will not be reliable propagated from the surefire-pluging to your test  I do not know why it works with eclipse   When using maven on the command line use the argLine property to wrap your property  This will pass them to your test  mvn -DargLine  -DWSNSHELL HOME conf  test   Use System getProperty to read the value in your code  Have a look to this post about the difference of System getenv and Sytem getProperty

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Another solution would be to set MAVEN OPTS  or other environment variables  in   user home   mavenrc  or  HOME  mavenrc pre bat on windows    Since Maven 3 3 1 there are new possibilities to set mvn command line parameters  if this is what you actually want      maven projectBasedir   mvn maven config   maven projectBasedir   mvn jvm config

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You could wrap your maven command in a bash script      bin bash  export YOUR VAR thevalue mvn test unset YOUR VAR

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There is a maven plugin called properties-maven-plugin this one provides a goal set-system-properties to set system variables  This is especially useful if you have a file containing all these properties  So you re able to read a property file and set them as system variable

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You can pass some of the arguments through the  JAVA OPTIONS variable  For example  define a variable for maven proxy flags like this   JAVA OPTIONS  quot -Dhttp proxyHost  http proxy host -Dhttp proxyPort  http proxy port -Dhttps proxyHost  https proxy host -Dhttps proxyPort  http proxy port quot   And then use mvn clean install  it will automatically pick up  JAVA OPTIONS

User · Answer

Following documentation from  Kevin s answer the below one worked for me for setting environment variable with maven sure-fire plugin  lt plugin gt   lt groupId gt org apache maven plugins lt  groupId gt   lt artifactId gt maven-surefire-plugin lt  artifactId gt   lt configuration gt       lt environmentVariables gt           lt WSNSHELL HOME gt conf lt  WSNSHELL HOME gt       lt  environmentVariables gt   lt  configuration gt

User · Answer

I suggest using the amazing tool direnv  With it you can inject environment variables once you cd into the project  These steps worked for me   envrc file source up dotenv   env file  JAVA OPTIONS  quot -DYourEnvHere 123 quot

User · Answer

in your code add   System getProperty  WSNSHELL HOME     Modify or add value property from maven command    mvn clean test -DargLine -DWSNSHELL HOME yourvalue   If you want to run it in Eclipse  add VM arguments in your Debug Run configurations    Go to Run -  Run configurations Select Tab Arguments Add in section VM Arguments       -DWSNSHELL HOME yourvalue     you don t need to modify the POM

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