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 <[email protected]> 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
> >
> and 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 <[email protected]> wrote:
>
> > Hi everyone,
> >
> > I forked and cloned the project from GitHub
> > <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
> >
>
<?xml version="1.0" encoding="UTF8"?>
<toolchains>
<toolchain>
<type>jdk</type>
<provides>
<version>1.8</version>
</provides>
<configuration>
<jdkHome>/usr/lib/jvm/java-8-openjdk-amd64</jdkHome>
</configuration>
</toolchain>
<toolchain>
<type>jdk</type>
<provides>
<version>11</version>
</provides>
<configuration>
<jdkHome>/usr/lib/jvm/java-11-openjdk-amd64</jdkHome>
</configuration>
</toolchain>
</toolchains>
