Specify system property to Maven project

Question

Is there a way   I mean how do I   set a system property in a maven project   I want to access a property from my test and my webapp   running locally   and I know I can use a java system property    Should I put that in   settings xml or something like that   Context  I took an open source project and managed to change the db configuration to use JavaDB  Now  in the jdbc url for JavaDB  the location of the database could be specified as the full path   see  this other question     Or a system property  derby system home  I have the code working already  but currently it is all hardcoded to     jdbc derby  Users oscarreyes javadbs mydb   And I want to remove the full path  to leave it like    jdbc derby mydb   To do that I need to specify the system property   derby system home   to maven  but I don t know how    The test are performed using junit   I don t see any plugin in pom xml   and the web app runs with the jetty plugin    Specifying the system property in the command line seems to work for jetty  but I m not sure if that s something practical   granted some other users may run it from eclipse idea  whatever

User · Answer

properties-maven-plugin plugin may help    lt plugin gt       lt groupId gt org codehaus mojo lt  groupId gt       lt artifactId gt properties-maven-plugin lt  artifactId gt       lt version gt 1 0 0 lt  version gt       lt executions gt           lt execution gt               lt goals gt                   lt goal gt set-system-properties lt  goal gt               lt  goals gt               lt configuration gt                   lt properties gt                       lt property gt                           lt name gt my property name lt  name gt                           lt value gt my property value lt  value gt                       lt  property gt                   lt  properties gt               lt  configuration gt           lt  execution gt       lt  executions gt   lt  plugin gt

User · Answer

Is there a way   I mean how do I   set a system property in a maven project  I want to access a property from my test         You can set system properties in the Maven Surefire Plugin configuration  this makes sense since tests are forked by default   From Using System Properties    lt project gt             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 version gt 2 5 lt  version gt           lt configuration gt             lt systemPropertyVariables gt               lt propertyName gt propertyValue lt  propertyName gt               lt buildDirectory gt   project build directory  lt  buildDirectory gt                               lt  systemPropertyVariables gt           lt  configuration gt         lt  plugin gt       lt  plugins gt     lt  build gt           lt  project gt       and my webapp   running locally      Not sure what you mean here but I ll assume the webapp container is started by Maven  You can pass system properties on the command line using   mvn -DargLine  -DpropertyName propertyValue    Update  Ok  got it now  For Jetty  you should also be able to set system properties in the Maven Jetty Plugin configuration  From Setting System Properties    lt project gt           lt plugins gt                 lt plugin gt           lt groupId gt org mortbay jetty lt  groupId gt           lt artifactId gt maven-jetty-plugin lt  artifactId gt           lt configuration gt                         lt systemProperties gt               lt systemProperty gt                 lt name gt propertyName lt  name gt                 lt value gt propertyValue lt  value gt               lt  systemProperty gt                            lt  systemProperties gt           lt  configuration gt         lt  plugin gt     lt  plugins gt   lt  project gt

User · Answer

I have learned it is also possible to do this with the exec-maven-plugin if you re doing a  standalone  java app                lt plugin gt               lt groupId gt org codehaus mojo lt  groupId gt               lt artifactId gt exec-maven-plugin lt  artifactId gt               lt version gt   maven exec plugin version  lt  version gt               lt executions gt                   lt execution gt                       lt goals gt                           lt goal gt java lt  goal gt                       lt  goals gt                   lt  execution gt               lt  executions gt               lt configuration gt                   lt mainClass gt   exec main-class  lt  mainClass gt                   lt systemProperties gt                       lt systemProperty gt                           lt key gt myproperty lt  key gt                           lt value gt myvalue lt  value gt                       lt  systemProperty gt                   lt  systemProperties gt               lt  configuration gt           lt  plugin gt

User · Answer

If your test and webapp are in the same Maven project  you can use a property in the project POM  Then you can filter certain files which will allow Maven to set the property in those files  There are different ways to filter  but the most common is during the resources phase - http   books sonatype com mvnref-book reference resource-filtering-sect-description html  If the test and webapp are in different Maven projects  you can put the property in settings xml  which is in your maven repository folder  C  Documents and Settings username m2  on Windows  You will still need to use filtering or some other method to read the property into your test and webapp

[maven-2] Specify system property to Maven project

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Examples related to system-properties