Maven version with a property

Question

I have big Maven  Tycho  project witch about 400 plug-ins   We have specified version of application in each POM file   Is there a way how to specify the version for all POM s only on one place   I would expect some think like    lt properties gt   lt buildVersion gt 1 1 2-SNAPSHOT lt  buildVersion gt   lt  properties gt          lt version gt   buildVersion  lt  version gt    We have parent pom xml    lt modelVersion gt 4 0 0 lt  modelVersion gt   lt groupId gt company lt  groupId gt   lt artifactId gt build parent lt  artifactId gt   lt version gt 1 1 2-SNAPSHOT lt  version gt   lt packaging gt pom lt  packaging gt    Then in each POM is reference to parent POM    lt parent gt     lt artifactId gt build parent lt  artifactId gt     lt groupId gt company lt  groupId gt     lt relativePath gt    build parent pom xml lt  relativePath gt     lt version gt 1 1 2-SNAPSHOT lt  version gt   lt  parent gt    lt modelVersion gt 4 0 0 lt  modelVersion gt   lt groupId gt company lt  groupId gt   lt artifactId gt artifact lt  artifactId gt   lt version gt 1 1 2-SNAPSHOT lt  version gt   lt packaging gt eclipse-plugin lt  packaging gt

User · Answer

If you re using Maven 3  one option to work around this problem is to use the versions plugin http   www mojohaus org versions-maven-plugin   Specifically the commands    mvn versions set -DnewVersion 2 0-RELEASE mvn versions commit   This will update the parent and child poms to 2 0-RELEASE  You can run this as a build step before   Unlike the release plugin  it doesn t try to talk to your source control

User · Answer

If you have a parent project you can set the version in the parent pom and in the children you can reference sibling libs with the   project version  or   version  properties   If you want to avoid to repeat the version of the parent in each children  you can do this    lt modelVersion gt 4 0 0 lt  modelVersion gt   lt groupId gt company lt  groupId gt   lt artifactId gt build parent lt  artifactId gt   lt version gt   my version  lt  version gt   lt packaging gt pom lt  packaging gt    lt properties gt   lt my version gt 1 1 2-SNAPSHOT lt  my version gt   lt  properties gt    And then in your children pom you have to do        lt parent gt         lt artifactId gt build parent lt  artifactId gt         lt groupId gt company lt  groupId gt         lt relativePath gt    build parent pom xml lt  relativePath gt         lt version gt   my version  lt  version gt       lt  parent gt        lt modelVersion gt 4 0 0 lt  modelVersion gt       lt groupId gt company lt  groupId gt       lt artifactId gt artifact lt  artifactId gt       lt packaging gt eclipse-plugin lt  packaging gt        lt dependencies gt           lt dependency gt               lt groupId gt company lt  groupId gt              lt artifactId gt otherartifact lt  artifactId gt                 lt version gt   my version  lt  version gt  or             lt version gt   project version  lt  version gt           lt  dependency gt       lt  dependencies gt    hth

User · Answer

I have two recommendation for you  Use CI Friendly Revision for all your artifacts  You can add -Drevision 2 0 1 in  mvn maven config file  So basically you define your version only at one location  For all external dependency create a property in parent file  You can use Apache Camel Parent Pom as reference

User · Answer

Using a property for the version generates the following warning    WARNING   WARNING  Some problems were encountered while building the effective model for xxx yyy sandbox Sandbox war 0 1 0-SNAPSHOT  WARNING   version  contains an expression but should be a constant    xxx yyy sandbox Sandbox   my version   C  Users xxx development gwtsandbox pom xml  line 8  column 14  WARNING   WARNING  It is highly recommended to fix these problems because they threaten the stability of your build   WARNING   WARNING  For this reason  future Maven versions might no longer support building such malformed projects   WARNING    If your problem is that you have to change the version in multiple places because you are switching versions  then the correct thing to do is to use the Maven Release Plugin that will do this for you automatically

User · Answer

The version of the pom xml should be valid  lt groupId gt com amazonaws lambda lt  groupId gt   lt artifactId gt lambda lt  artifactId gt   lt version gt 2 2 4 SNAPSHOT lt  version gt   lt packaging gt jar lt  packaging gt   This version should not be like 2 2 4  etc

User · Answer

The correct answer is this  example version     In parent pom xml you should have  not inside properties     lt version gt 0 0 1-SNAPSHOT lt  version gt   In all child modules you should have    lt parent gt       lt groupId gt com vvirlan lt  groupId gt       lt artifactId gt grafiti lt  artifactId gt       lt version gt 0 0 1-SNAPSHOT lt  version gt   lt  parent gt     So it is hardcoded   Now  to update the version you do this   mvn versions set -DnewVersion 0 0 2-SNAPSHOT mvn versions commit   Necessary to remove the backup file pom xml   and all your 400 modules will have the parent version updated

User · Answer

With a Maven version of 3 5 or higher  you should be able to use a placeholder  e g    revision   in the parent section and inside the rest of the pom  you can use   project version    Actually  you can also omit project properties outside of parent which are the same  as they will be inherited  The result would look something like this    lt project gt       lt parent gt       lt artifactId gt build parent lt  artifactId gt       lt groupId gt company lt  groupId gt       lt relativePath gt    build parent pom xml lt  relativePath gt       lt version gt   revision  lt  version gt    lt  -- use placeholder -- gt       lt  parent gt        lt modelVersion gt 4 0 0 lt  modelVersion gt       lt artifactId gt artifact lt  artifactId gt       lt  -- no  version   no  groupId   inherited from parent -- gt       lt packaging gt eclipse-plugin lt  packaging gt            lt  project gt    For more information  especially on how to resolve the placeholder during publishing  see Maven CI Friendly Versions   Multi Module Setup

User · Answer

See the Maven - Users forum  version  contains an expression but should be a constant  Better way to add a new version       here is why this is a bad plan       the pom that gets deployed will not have the property value resolved  so   anyone depending on that pom will pick up the dependency as being the string uninterpolated with the      and much hilarity will ensue in your   build process       in maven 2 1 0 and or 2 2 0 an attempt was made to deploy poms with   resolved properties    this broke more than expected  which is why those   two versions are not recommended  2 2 1 being the recommended 2 x version

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