[jboss-jira] [JBoss JIRA] (WFCORE-3895) module.path of embedded server cannot be modified after it is set

[James Perkins (JIRA)]

    [ https://issues.jboss.org/browse/WFCORE-3895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582953#comment-13582953 ] 

James Perkins commented on WFCORE-3895:
---------------------------------------

While previously the module path was allowed to be changed, it wasn’t really changed on the module loader because it’s effectively static. An error shouldn’t be thrown, but it should be logging a message. 

> module.path of embedded server cannot be modified after it is set
> -----------------------------------------------------------------
>
>                 Key: WFCORE-3895
>                 URL: https://issues.jboss.org/browse/WFCORE-3895
>             Project: WildFly Core
>          Issue Type: Bug
>          Components: Embedded
>    Affects Versions: 5.0.0.Beta5
>            Reporter: Erich Duda
>            Assignee: James Perkins
>            Priority: Blocker
>
> *Scenario:*
> * Run CLI in non-modular class loading mode.
> * Run embed-server with {{--jboss-home}} pointing to server A
> * Stop embed-server
> * Remove server A
> * Run embed-server with {{--jboss-home}} pointing to server B
> *Expectation:* embed-server with {{--jboss-home}} pointing to server B will boot.
> *Reality*: The following error message is thrown. As you can see the embed server tries to load modules from server A directory even if the jboss-home was set to server B.
> {code}
> Cannot start embedded server: The first directory of the specified module path /home/eduda/Projects/wildfly/dist/target/wildfly-A/modules is invalid or does not exist.
> {code}
> *Users impact:* Behavior of non-modular class loading \[1\] has changed. This change can break user's automation or tests.
> *Blocker priority* was chosen because this is change in behavior against Wildfly 12.
> *Technical details*
> When the embed-server is started for the second time, following warning is logged.
> {code}
> 2018-05-28 08:10:57,621 WARN  [org.jboss.as.embedded] (main) WFLYEMB0145: The module loader has already been configured. Changing the module.path property will have no effect
> {code}
> It seems that the change in behavior was caused by commit \[2\].
> \[1\] http://wildfly.org/news/2015/03/13/Offline-CLI/#classloading
> \[2\] https://github.com/wildfly/wildfly-core/commit/22f3956f1adcdf8b1cb11e24f2b904dd4e900429



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