How to refer environment variable in POM xml

Question

I am using maven as build tool   I have set an environment variable called env   How can I get access to this environment variable s value in the pom xml file

User · Answer

You can use  lt properties gt  tag to define a custom variable and   variable  pattern to use it    lt project xmlns  http   maven apache org POM 4 0 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance  xsi schemaLocation  http   maven apache org POM 4 0 0 http   maven apache org maven-v4 0 0 xsd  gt        lt  -- define -- gt       lt properties gt           lt property name gt 1 0 lt  property name gt       lt  properties gt        lt  -- using -- gt       lt version gt   property name  lt  version gt    lt  project gt

User · Answer

I was struggling with the same thing  running a shell script that set variables  then wanting to use the variables in the shared-pom  The goal was to have environment variables replace strings in my project files using the com google code maven-replacer-plugin   Using   env foo  or   env FOO  didn t work for me  Maven just wasn t finding the variable  What worked was passing the variable in as a command-line parameter in Maven  Here s the setup    Set the variable in the shell script  If you re launching Maven in a sub-script  make sure the variable is getting set  e g  using source   maven script sh to call it from the parent script  In shared-pom  create a command-line param that grabs the environment variable      lt plugin gt           lt executions gt       lt executions gt                 lt execution gt                     lt configuration gt             lt param gt   foo  lt  param gt   lt  -- Note this is  not    env foo  -- gt           lt  configuration gt     In com google code maven-replacer-plugin  make the replacement value   foo   In my shell script that calls maven  add this to the command  -Dfoo  foo

User · Answer

Check out the Maven Properties Guide     As Seshagiri pointed out in the comments    env VARIABLE NAME  will do what you want   I will add a word of warning and say that a pom xml should completely describe your project so please use environment variables judiciously  If you make your builds dependent on your environment  they are harder to reproduce

User · Answer

Can t we use   lt properties gt       lt my variable gt   env MY VARIABLE  lt  my variable gt   lt  properties gt

User · Answer

It might be safer to directly pass environment variables to maven system properties  For example  say on Linux you want to access environment variable MY VARIABLE  You can use a system property in your pom file    lt properties gt               lt  -- Default value for my variable can be defined here -- gt       lt my variable gt foo lt  my variable gt           lt  properties gt       lt  -- Use my variable -- gt        my variable        Set the property value on the maven command line   mvn clean package -Dmy variable  MY VARIABLE

User · Answer

Also  make sure that your environment variable is composed only by UPPER CASE LETTERS     I don t know why  the documentation doesn t say nothing explicit about it  at least the link provided by  Andrew White   but if the variable is a lower case word  e g  env dummy   the variable always came empty or null     i was struggling with this like an hour  until I decided to try an UPPER CASE VARIABLE  and problem solved   OK Variables Examples    DUMMY DUMMY ONE JBOSS SERVER PATH    NOTE  I was using maven v3 0 5   I Hope that this can help someone

[java] How to refer environment variable in POM.xml?

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