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> 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> > 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 <jtsa0...@gmail.com> 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 >> > >> >
