[jboss-jira] [JBoss JIRA] (WFCORE-4688) '-Xlog:gc' option is not supported on OpenJDK11 + OpenJ9

[James Perkins (Jira)]

    [ https://issues.jboss.org/browse/WFCORE-4688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804272#comment-13804272 ] 

James Perkins commented on WFCORE-4688:
---------------------------------------

Just some notes as I'm starting to look at this. There is no plan to support jEP 158 on OpenJ9, https://github.com/eclipse/openj9/issues/3999. 

https://www.eclipse.org/openj9/docs/gc/ is the documentation.

> '-Xlog:gc' option is not supported on OpenJDK11 + OpenJ9
> --------------------------------------------------------
>
>                 Key: WFCORE-4688
>                 URL: https://issues.jboss.org/browse/WFCORE-4688
>             Project: WildFly Core
>          Issue Type: Bug
>          Components: Scripts
>            Reporter: Jan Stourac
>            Assignee: James Perkins
>            Priority: Major
>
> With OpenJDK11 + OpenJ9, I can see following error during the server bootup:
> {code}
> JVMJ9VM085W Malformed option: '-Xlog:gc*:file=<JBOSS_HOME_PATH>/standalone/log/gc.log:time'
> {code}
> Based on the [discussion here|https://github.com/eclipse/openj9/issues/3999], the {{-Xlog:gc}} option is not supported in this JDK and it won't be.
> Relevant part of the startup script for standalone.sh in [upstream WildFly|https://github.com/wildfly/wildfly-core/blob/master/core-feature-pack/src/main/resources/content/bin/standalone.sh#L281].
> This warning occurs only on OpenJDK11 + OpenJ9. This does not show up when using OpenJDK8 + OpenJ9 as different branch in script is used in that case ({{-verbose:gc -Xloggc:\"$JBOSS_LOG_DIR/gc.log\" -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=3M -XX:-TraceClassUnloading}}).



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