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https://jira.codehaus.org/browse/MANTRUN-178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=329353#comment-329353
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Ondrej Zizka commented on MANTRUN-178:
--------------------------------------
Example of what it causes: https://bugzilla.redhat.com/show_bug.cgi?id=970610
> Ignore precedence of mvn command line over property defined in <properties>
> section
> -----------------------------------------------------------------------------------
>
> Key: MANTRUN-178
> URL: https://jira.codehaus.org/browse/MANTRUN-178
> Project: Maven 2.x Antrun Plugin
> Issue Type: Bug
> Affects Versions: 1.7
> Environment: Apache Maven 3.0.4 (r1232337; 2012-01-17 00:44:56-0800)
> Java version: 1.6.0_22, vendor: Sun Microsystems Inc.
> OS name: "windows xp"
> arch: "x86"
> Reporter: Arata
> Attachments: antrun.zip
>
>
> When (Maven) property is not defined in <properties> section in pom.xml and
> (System) property is given at mvn command line, then such property is picked
> up properly in Ant target.
> When (Maven) property is defined in <properties> section in pom.xml and
> (System) property is given with different value at mvn command line, such
> property value in Ant target is kept to one defined in the <properties>
> section, not one given at mvn command line; and this conflicts with how other
> Maven plugins treats such property value. The expectation is that it picks up
> the value given at the mvn command line.
> The antrun.zip attachment contains a sample Maven project. please try it run
> like:
> mvn -Dproptest_sysprop="defined" -Dproptest_Overwrite=true initialize
> It will demonstrate the issue like:
> [echo] *** mvn recognizes proptest_Overwrite property value as "true".
> ***
> ...
> [echo] *** Checking integrity over proptest_Overwrite property as case
> of overwriting hard-coded property value at mvn command line. ***
> [echo]
> [echo] Dump of proptest_Overwrite value by Ant's echoproperties tag:
> ...
> [echoproperties] proptest_Overwrite=false
> [echo]
> [echo] Dump of proptest_Overwrite value by Ant's echo tag:
> [echo] proptest_Overwrite = true
> [echo]
> [echo] proptest_Overwrite property value could keep integrity at Ant's
> equals condition tag: its value is recognized as "true".
> [INFO]
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO]
> ------------------------------------------------------------------------
> ...
> [ERROR] Target exception: java.lang.RuntimeException: proptest_Overwrite
> property value could not keep integrity in Ant's Project object: expected
> "true" but actually "false"
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