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https://issues.apache.org/jira/browse/MENFORCER-393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17471170#comment-17471170
 ] 

Tilman Hausherr commented on MENFORCER-393:
-------------------------------------------

Same problem in the Apache Tika project. I was trying to change version from 
3.0.0-M3 to 3.0.0 and one of the subprojects fails.

Old output
{noformat}
--- maven-enforcer-plugin:3.0.0-M3:enforce (enforce-maven-version) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0-M3:enforce (enforce-java-version) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0-M3:enforce (enforce-output-timestamp-property) 
@ tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0-M3:enforce (enforce-maven) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0-M3:enforce (ban-bad-log4j-versions) @ 
tika-parser-scientific-module ---

{noformat}

New output
{noformat}
--- maven-enforcer-plugin:3.0.0:enforce (enforce-maven-version) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0:enforce (enforce-java-version) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0:enforce (enforce-output-timestamp-property) @ 
tika-parser-scientific-module ---

--- maven-enforcer-plugin:3.0.0:enforce (enforce-maven) @ 
tika-parser-scientific-module ---
Rule 0: org.apache.maven.plugins.enforcer.DependencyConvergence failed with 
message:
Could not build dependency tree Could not collect dependencies: 
org.apache.tika:tika-parser-scientific-module:jar:2.2.2-SNAPSHOT ()
{noformat}


> Upgrading to 3.0.0 causes `Could not build dependency tree` with repositories 
> some unknown protocol
> ---------------------------------------------------------------------------------------------------
>
>                 Key: MENFORCER-393
>                 URL: https://issues.apache.org/jira/browse/MENFORCER-393
>             Project: Maven Enforcer Plugin
>          Issue Type: Bug
>          Components: Plugin
>    Affects Versions: 3.0.0
>            Reporter: johnny willer gasperi goncalves
>            Priority: Major
>         Attachments: enforcer_output
>
>
> After upgrading to 3.0.0, it's not possible to validate the POM anymore, an 
> error like 
> {code:java}
> Could not build dependency tree Could not collect dependencies: 
> {jarname}{code}
> happens.
>  
> I'm attaching the `mvn validate -X` dump (i have omitted some jars from the 
> output) 



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