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https://issues.apache.org/jira/browse/AMBARI-18051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15529906#comment-15529906
 ] 

Doroszlai, Attila commented on AMBARI-18051:
--------------------------------------------

Hi [~Tim Thorpe],

This change causes build failure when running unit tests with Maven without 
{{clean}} if any tests need recompilation.  This makes running specific unit 
tests after changes more expensive in terms of time, since we need to clean, 
too.

{noformat}
$ mvn -pl ambari-server -DskipPythonTests -Dtest=ServiceModuleTest clean test
...
[INFO] BUILD SUCCESS
[INFO] Total time: 33.124 s
...
$ mvn -pl ambari-server -DskipPythonTests -Dtest=ServiceModuleTest test
...
[INFO] BUILD SUCCESS
[INFO] Total time: 16.026 s
...
$ touch 
ambari-server/src/test/java/org/apache/ambari/server/stack/ServiceModuleTest.java
$ mvn -pl ambari-server -DskipPythonTests -Dtest=ServiceModuleTest test
...
[INFO] BUILD FAILURE
[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-jar-plugin:3.0.2:test-jar 
(create-sample-upgrade-check-jar) on project ambari-server: Error assembling 
JAR: A zip file cannot include itself
...
$ touch 
ambari-server/src/test/java/org/apache/ambari/server/stack/ServiceModuleTest.java
$ mvn -pl ambari-server clean process-test-classes
...
[INFO] BUILD SUCCESS
...
{noformat}

Could you please check?  Thanks.

> Services should be able to provide their own pre-req checks by supplying a 
> jar file
> -----------------------------------------------------------------------------------
>
>                 Key: AMBARI-18051
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18051
>             Project: Ambari
>          Issue Type: New Feature
>          Components: ambari-server
>    Affects Versions: trunk
>            Reporter: Tim Thorpe
>            Assignee: Tim Thorpe
>         Attachments: AMBARI-18051.patch
>
>
> Services should be able to provide their own pre-req checks by supplying a 
> jar file.
> This would allow custom services to supply their own jar files to handle 
> pre-req checks rather than forcing third party developers to make changes to 
> ambari-server code.



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