You are making progress! I saw those same errors in one of our automated builds 
the other day. I am not sure what the problem is but haven’t looked into it yet.

Ralph

> On Dec 8, 2020, at 9:23 AM, Joseph Tsai <jtsa0...@gmail.com> wrote:
> 
> I kinda inferred that from reading the mvnw script when Volkan directed me to 
> run command. So I exported JAVA_HOME=[path/to/my/Java8] into my .bashrc and 
> I'm not failing the same thing anymore.
> 
> But I'm still getting errors, this time it is failing some unit tests from 
> the surefire plugin. I tried to fix it but I couldn't.
> <image.png>
> <image.png>
> <image.png>
> From reading some 
> <https://stackoverflow.com/questions/36427868/failed-to-execute-goal-org-apache-maven-pluginsmaven-surefire-plugin2-12test/55835974>
>  StackOverflow 
> <https://stackoverflow.com/questions/46831762/maven-build-and-maven-failsafe-plugin-the-forked-vm-terminated-without-properl>
>  posts, it seems to have something to do with the surefire plugin version 
> number? I tried to downgrade it to some lower versions but it didn't work.
> 
> I have also attached a zip of the surefire reports.
> 
> Thanks,
> 
> 
> On Wed, 9 Dec 2020 at 02:37, Matt Sicker <boa...@gmail.com 
> <mailto:boa...@gmail.com>> wrote:
> The full build isn't compatible with Java 11 yet, so you need both 8 and 11
> configured in a toolchains.xml config. Then you need to use Java 8 as the
> default JVM (or at least the contents of JAVA_HOME), and the build will
> switch to higher version compilers for the modules that require it.
> Ideally, the build would be updated to simplify this, but it's a fairly
> difficult problem as it's still a relatively new area in Maven with
> multiple alternatives to how to support it.
> 
> On Tue, 8 Dec 2020 at 08:13, Volkan Yazıcı <volkan.yaz...@gmail.com 
> <mailto:volkan.yaz...@gmail.com>> wrote:
> 
> > Would you mind changing the default JDK you start *mvnw* to version 8 and
> > retrying via *./mvnw clean package -DskipTests*, please? (Here *clean*
> > goal is necessary for removing the class files compiled earlier with the
> > wrong JDK.)
> > [Sorry for the short answer, struggling with my day-job in the meantime.]
> >
> > On Tue, Dec 8, 2020 at 3:02 PM Joseph Tsai <jtsa0...@gmail.com 
> > <mailto:jtsa0...@gmail.com>> wrote:
> >
> >> Hi Volkan,
> >>
> >> I just installed both JDK8 and 11 and tried to do mvn clean install. The
> >> same error persists, and I think it's looking at my default Java
> >> installation?
> >> Running "sudo update-alternatives --config java" shows the following:
> >> [image: image.png]
> >> Currently it is defaulted to Java15, and everytime I change the default
> >> Java the wrong version circled in blue changes.
> >> [image: image.png]
> >> I also looked up what version 53 is, it is apparently Java9?
> >>
> >> My questions are:
> >>
> >>    - Am I supposed to update the default Java to Java11 or 8? If not, is
> >>    simply putting in more toolchain entries under toolchains.xml is enough?
> >>    - How is Java9 related to the error message, if at all?
> >>    - Honestly I am not sure what I'm supposed to do with the maven.yml
> >>    example you linked...
> >>
> >> I have also attached a new copy of my updated toolchains.xml. A bit of
> >> information on my environment, I'm using Windows and do development through
> >> WSL2.0.
> >>
> >> Thanks once again,
> >> Joseph
> >>
> >> On Tue, 8 Dec 2020 at 22:44, Volkan Yazıcı <volkan.yaz...@gmail.com 
> >> <mailto:volkan.yaz...@gmail.com>>
> >> wrote:
> >>
> >>> Hello Joseph,
> >>>
> >>> You need to have both JDK 8 and 11 installed and configured in your
> >>> toolchains.xml file. For reference, you can check how we do it in GitHub
> >>> Actions workflow: maven.yml
> >>> <
> >>> https://github.com/apache/logging-log4j2/blob/master/.github/workflows/maven.yml
> >>>  
> >>> <https://github.com/apache/logging-log4j2/blob/master/.github/workflows/maven.yml>
> >>> >
> >>> and maven-toolchains.xml
> >>> <
> >>> https://github.com/apache/logging-log4j2/blob/master/.github/workflows/maven-toolchains.xml
> >>>  
> >>> <https://github.com/apache/logging-log4j2/blob/master/.github/workflows/maven-toolchains.xml>
> >>> >.
> >>> Once this is done, *./mvnw package -DskipTests* should succeed. Let us
> >>> know
> >>> if you encounter any further troubles.
> >>>
> >>> Kind regards.
> >>>
> >>> On Tue, Dec 8, 2020 at 12:22 PM Joseph Tsai <jtsa0...@gmail.com 
> >>> <mailto:jtsa0...@gmail.com>> wrote:
> >>>
> >>> > Hi everyone,
> >>> >
> >>> > I forked and cloned the project from GitHub
> >>> > <https://github.com/apache/logging-log4j2 
> >>> > <https://github.com/apache/logging-log4j2>>. And spent the past couple
> >>> of
> >>> > hours trying to build from source with mvn install.
> >>> >
> >>> > It is failing with errors saying "class file has wrong version 55.0,
> >>> > should be 53.0" for "bad class file:
> >>> > /modules/java.base/java/util/EnumSet.class", which I think it means I
> >>> > probably need to find a Java 9 to install and build the project with?
> >>> But
> >>> > since Java 9 was discontinued, I haven't been able to find an Oracle
> >>> nor an
> >>> > OpenJDK version to install.
> >>> >
> >>> > I have attached an output txt file for maven install and my current
> >>> maven
> >>> > toolchain.xml if it helps clarifying what I might have been doing
> >>> wrong.
> >>> >
> >>> > Thanks,
> >>> > Joseph
> >>> >
> >>>
> >>
> <surefire-reports.zip>

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