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
?
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.)
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, eg
<build>
<plugins>
...
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
...
<configuration>
...
<systemPropertyVariables>
<WSNSHELL_HOME>conf</WSNSHELL_HOME>
</systemPropertyVariables>
</configuration>
</plugin>
...
</plugins>
</build>
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
.
You could wrap your maven command in a bash script:
#!/bin/bash
export YOUR_VAR=thevalue
mvn test
unset YOUR_VAR
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
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
...
<configuration>
<includes>
...
</includes>
<environmentVariables>
<WSNSHELL_HOME>conf</WSNSHELL_HOME>
</environmentVariables>
</configuration>
</plugin>
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
${maven.projectBasedir}/.mvn/jvm.config
Following documentation from @Kevin's answer the below one worked for me for setting environment variable with maven sure-fire plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<environmentVariables>
<WSNSHELL_HOME>conf</WSNSHELL_HOME>
</environmentVariables>
</configuration>
There is a maven plugin called properties-maven-plugin this one provides a goal set-system-properties
to set system variables. This is especially useful if you have a file containing all these properties. So you're able to read a property file and set them as system variable.
in your code add:
System.getProperty("WSNSHELL_HOME")
Modify or add value property from maven command:
mvn clean test -DargLine=-DWSNSHELL_HOME=yourvalue
If you want to run it in Eclipse, add VM arguments in your Debug/Run configurations
-DWSNSHELL_HOME=yourvalue
you don't need to modify the POM
You can pass some of the arguments through the _JAVA_OPTIONS
variable.
For example, define a variable for maven proxy flags like this:
_JAVA_OPTIONS="-Dhttp.proxyHost=$http_proxy_host -Dhttp.proxyPort=$http_proxy_port -Dhttps.proxyHost=$https_proxy_host -Dhttps.proxyPort=$http_proxy_port"
And then use mvn clean install
(it will automatically pick up _JAVA_OPTIONS
).
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="-DYourEnvHere=123"
As someone might end up here changing his global Java options, I want to say defining _JAVA_OPTIONS is a bad idea. Instead define MAVEN_OPTS environment variable which will still be picked up automatically by Maven but it won't override everything like _JAVA_OPTS will do (eg IDE vm options).
MAVEN_OPTS="-DmyVariable=someValue"
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