Maven 3 warnings about build plugins plugin version

Question

Since I updated to Maven 3 I get the following warning messages at each build    How can I get rid of these warnings    INFO  Scanning for projects     WARNING    WARNING  Some problems were encountered while building the effective model for proj id jar 3 1  WARNING   build plugins plugin version  for org apache maven plugins maven-javadoc-plugin is missing    line 195  column 15  WARNING   build plugins plugin version  for org apache maven plugins maven-compiler-plugin is missing    line 204  column 15  WARNING   build plugins plugin version  for org apache maven plugins maven-surefire-plugin is missing    line 227  column 15  WARNING   build plugins plugin version  for org apache maven plugins maven-jar-plugin is missing    line 215  column 15  WARNING   reporting plugins plugin version  for org codehaus mojo jdepend-maven-plugin is missing    line 271  column 15  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

User · Answer

Maven 3 is more restrictive with the POM-Structure. You have to set versions of Plugins for instance.

With maven 3.1 these warnings may break you build. There are more changes between maven2 and maven3: https://cwiki.apache.org/confluence/display/MAVEN/Maven+3.x+Compatibility+Notes

User · Answer

Add a  lt version gt  element after the  lt plugin gt   lt artifactId gt  in your pom xml file  Find the following text    lt plugin gt     lt artifactId gt maven-compiler-plugin lt  artifactId gt    Add the version tag to it    lt plugin gt     lt artifactId gt maven-compiler-plugin lt  artifactId gt     lt version gt 2 3 2 lt  version gt    The warning should be resolved   Regarding this       build plugins plugin version  for   org apache maven plugins maven-compiler-plugin is missing   Many people have mentioned why the issue is happening  but fail to suggest a fix  All I needed to do was to go into my POM file for my project  and add the  lt version gt  tag as shown above   To discover the version number  one way is to look in Maven s output after it finishes running  Where you are missing version numbers  Maven will display its default version    INFO  --- maven-compiler-plugin 2 3 2 compile  default-compile    entities ---   Take that version number  as in the 2 3 2 above  and add it to your POM  as shown

User · Answer

Search  maven-jar-plugin  in pom xml and add version tag  maven version

User · Answer

get the latest version information from   https   mvnrepository com artifact org apache maven plugins maven-compiler-plugin  click on the latest version  or the one you d like to use  and you ll see the the dependency info  as of 2019-05 it s 3 8 1     lt  -- https   mvnrepository com artifact org apache maven plugins maven-compiler-plugin -- gt   lt dependency gt     lt groupId gt org apache maven plugins lt  groupId gt     lt artifactId gt maven-compiler-plugin lt  artifactId gt     lt version gt 3 8 1 lt  version gt   lt  dependency gt    you might want to use the version tag and the comment for your plugin tag    lt  -- https   mvnrepository com artifact org apache maven plugins maven-compiler-plugin -- gt   lt plugin gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 8 1 lt  version gt       lt configuration gt           lt source   gt           lt target   gt       lt  configuration gt   lt  plugin gt    if you like you can modify your pom to have the version information in the properties tag as outlined in another answer

User · Answer

I m using a parent pom for my projects and wanted to specify the versions in one place  so I used properties to specify the version   parent pom    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 xsd maven-4 0 0 xsd  gt                lt properties gt           lt maven-compiler-plugin-version gt 2 3 2 lt  maven-compiler-plugin-version gt       lt  properties gt            lt  project gt    project pom    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 xsd maven-4 0 0 xsd  gt                lt build gt           lt finalName gt helloworld lt  finalName gt           lt plugins gt               lt plugin gt                   lt groupId gt org apache maven plugins lt  groupId gt                   lt artifactId gt maven-compiler-plugin lt  artifactId gt                   lt version gt   maven-compiler-plugin-version  lt  version gt                   lt configuration gt                       lt source gt 1 6 lt  source gt                       lt target gt 1 6 lt  target gt                   lt  configuration gt               lt  plugin gt           lt  plugins gt       lt  build gt   lt  project gt    See also  https   www allthingsdigital nl 2011 04 10 maven-3-and-the-versions-dilemma

User · Answer

It s great answer in here  And I want to add  Why Add a  element in Maven3   In Maven 3 x Compatibility Notes     Plugin Metaversion Resolution   Internally  Maven 2 x used the special version markers RELEASE and LATEST to support automatic plugin version resolution  These metaversions were also recognized in the  element for a  declaration  For the sake of reproducible builds  Maven 3 x no longer supports usage of these metaversions in the POM  As a result  users will need to replace occurrences of these metaversions with a concrete version    And I also find in maven-compiler-plugin - usage      Note  Maven 3 0 will issue warnings if you do not specify the version of a plugin

User · Answer

Run like        mvn help describe -DartifactId maven-war-plugin -DgroupId org apache maven plugins   for plug-in that have no version  You get output    Name  Maven WAR Plugin Description  Builds a Web Application Archive  WAR  file from the project   output and its dependencies  Group Id  org apache maven plugins Artifact Id  maven-war-plugin Version  2 2 Goal Prefix  war   Use version that shown in output   UPDATE If you want to select among list of versions  use http   search maven org  or http   mvnrepository com  Note that your favorite Java IDE must have Maven package search dialog  Just check docs   SUPER UPDATE I also use     mvn dependency tree   mvn dependency list   mvn dependency resolve   mvn dependency resolve-plugins     lt -- THIS   Recently I discover how to get latest version for plug-in  or library  so no longer needs for googling or visiting Maven Central     mvn versions display-dependency-updates   mvn versions display-plugin-updates        lt -- THIS

[maven] Maven 3 warnings about build.plugins.plugin.version

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