[ 
http://jira.codehaus.org/browse/MNG-3756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=148225#action_148225
 ] 

Ian Springer commented on MNG-3756:
-----------------------------------

Sure, it looks like the key is indeed that is has to be within a profile. Also, 
that profile needs to be activated from the command line, rather than via 
activeByDefault. Run the attached pom as follows:

mvn validate -P test

This should result in mvn hanging as follows:

"main" prio=6 tid=0x002a6000 nid=0x1d90 runnable [0x0090f000..0x0090fe54]
   java.lang.Thread.State: RUNNABLE
        at java.util.regex.Pattern$Start.match(Pattern.java:3055)
        at java.util.regex.Matcher.search(Matcher.java:1105)
        at java.util.regex.Matcher.find(Matcher.java:535)
        at 
org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolateInternal(RegexBasedModelInterpo
lator.java:126)
        at 
org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolate(RegexBasedModelInterpolator.ja
va:98)
        at 
org.apache.maven.project.DefaultMavenProjectBuilder.processProjectLogic(DefaultMavenProjectBuilder.java:1016)

        at 
org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:878)
        at 
org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInternal(DefaultMavenProjectBuilder.ja
va:506)
        at 
org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:198)
        at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:583)
        at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:461)
        at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:292)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)


> having two properties that reference each other causes Maven to go into 
> infinite loop
> -------------------------------------------------------------------------------------
>
>                 Key: MNG-3756
>                 URL: http://jira.codehaus.org/browse/MNG-3756
>             Project: Maven 2
>          Issue Type: Bug
>          Components: POM
>    Affects Versions: 2.0.9
>            Reporter: Ian Springer
>         Attachments: pom.xml
>
>
> I had the following in my pom (it was within a profile in case that matters):
>          <properties>            
>             <xxx>${yyy}</xxx>        
>             <yyy>${xxx}</yyy>        
>          </properties>
> Here's the stack trace from a thread dump taken after Maven hung:
>         at 
> java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:393)
>         at java.lang.StringBuffer.append(StringBuffer.java:225)
>         - locked <0x06f7d9f0> (a java.lang.StringBuffer)
>         at 
> hidden.org.codehaus.plexus.util.StringUtils.replace(StringUtils.java:755)
>         at 
> hidden.org.codehaus.plexus.util.StringUtils.replace(StringUtils.java:721)
>         at 
> org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolateInternal(RegexBasedModelInterpo
> lator.java:177)
>         at 
> org.apache.maven.project.interpolation.RegexBasedModelInterpolator.interpolate(RegexBasedModelInterpolator.ja
> va:98)
>         at 
> org.apache.maven.project.DefaultMavenProjectBuilder.processProjectLogic(DefaultMavenProjectBuilder.java:1016)
>         at 
> org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:878)
>         at 
> org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInternal(DefaultMavenProjectBuilder.ja
> va:506)
>         at 
> org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:198)
>         at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:583)
>         at 
> org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:461)
>         at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
>         at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:292)
>         at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
>         at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)

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