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https://issues.apache.org/jira/browse/MNG-6260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16824431#comment-16824431
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Robert Scholte commented on MNG-6260:
-------------------------------------
Here's the reason why it prints {{null}} during {{mvn
com.test.plugins:testPlugin:deployMojo}}:
the deployMoyo is fully initialized before it executes
{{buildInjectPropertyMojo}}, so it is not aware of the (changed) value for
{{sample.generated}}.
In all other usecases buildInjectPropertyMojo is executed before the
initalization of deployMojo
> Inconsistency for dynamic property replacement while using Maven's Plugin
> Prefix Resolution
> -------------------------------------------------------------------------------------------
>
> Key: MNG-6260
> URL: https://issues.apache.org/jira/browse/MNG-6260
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.3.9, 3.5.0
> Reporter: S L
> Priority: Major
> Attachments: SampleProject.zip
>
>
> Hi,
> I recently discovered a strange behaviour dynamic property replacement while
> using Maven's Plugin Prefix Resolution.
> The original cause was reported to a project that I currently maintain and
> basically extract's repository information from git and inject them back as
> properties into the maven project.
> The original report was that one if generated properties does not get
> resolved when it is getting used as a configuration parameter while executing
> ??mvn appengine:deploy??.
> To be able to reproduce the issue I crafted a sample project that contain's
> of two Mojo's to simulate this behaviour.
> * The first Mojo {{BuildInjectPropertyMojo}} will inject a Property
> {{sample.generated}} to the Maven project
> * The second Mojo {{DeployMojo}} basically takes an arbitrary argument and
> prints it to the console. To reproduce the issue the Parameter needs to
> defined as followed
> {noformat}
> <some.exampleParameter>${sample.generated}</some.exampleParameter>
> {noformat}
> Observations:
> * When building with {noformat}mvn clean package{noformat} the injected
> Property {{sample.generated}} will be printed by the Mojo as well as from
> antrun correctly.
> * When building with {noformat}mvn
> com.test.plugins:testPlugin:deployMojo{noformat} the injected Property
> {{sample.generated}} will be printed by antrun correctly but will show up as
> null for the mojo execution.
> * When building with {noformat}mvn
> com.test.plugins:testPlugin:buildInjectPropertyMojo antrun:run
> com.test.plugins:testPlugin:deployMojo{noformat} he injected Property
> {{sample.generated}} will be printed by the Mojo as well as from antrun
> correctly.
> To use the attached example one need to install it first {noformat}mvn clean
> install{noformat} and remove the comments inside the pom.xml that are
> annotated with {{COMMENT THIS IN TO REPRODUCE}}
> Please note that the execution of {{mvn appengine:deploy}} is per offical
> guideline of this tool:
> https://cloud.google.com/appengine/docs/standard/java/tools/using-maven#deploying_your_application
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