[jira] [Updated] (LOG4J2-1937) Including log4j-core yields a compilation warning with -Xlint:all

["Guillaume Dumont (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LOG4J2-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guillaume Dumont updated LOG4J2-1937:
-------------------------------------
    Attachment: TestProject.zip

I've added a project with the minimum code to reproduce the issue (almost none). Just go in the folder and do the the usual {{gradle build}}.

Thanks for looking into this issue.

> Including log4j-core yields a compilation warning with -Xlint:all
> -----------------------------------------------------------------
>
>                 Key: LOG4J2-1937
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1937
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.8.2
>         Environment: MacOSX El Capitan
> {code}
> $> java -version
> java version "1.8.0_131"
> Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
> Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
> {code}
>            Reporter: Guillaume Dumont
>         Attachments: TestProject.zip
>
>
> It seems that starting from log4j2 (2.0+), including {{log4j-core}} to a project that invokes {{javac}} with the option {{-Xlint:all}} will show the warning below for all annotations in the project.
> {noformat}
> warning: No processor claimed any of these annotations: org.junit.Test,org.junit.Rule,org.junit.Ignore,org.junit.Before,org.junit.After
> {noformat}
> I could reproduce it using a small project by putting the following in the gradle file:
> {code}
> dependencies {
>     testCompile group: 'junit', name: 'junit', version: '4.11'
>     compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.0'
> }
> tasks.withType(JavaCompile) {
>     options.compilerArgs << "-Xlint:all"
> }
> {code}
> After a lot of research, the only workaround that I've seen suggested is basically to suppress this warning by using {{-Xlint:-processing}} instead. However this warning is definitely triggered by log4j2, which makes me think that this is where the root cause lies. In term of concrete impact, the annotations seem to work correctly.



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