How to avoid IntelliJ to reset language level?

I just update the pom.xml and it works for me.

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <source>1.11</source>
        <target>1.11</target>
        <release>11</release>
    </configuration>
</plugin>

You can update the Java Compiler version of your module to be executed to use Java version 10 with the following settings :

Build, Execution, Deployment => Compiler => Java Compiler => Update Target Bytecode version

In the image above you can notice that the modules guice and hbase are defaulting to use Java version 5 while I've updated the others to use Java version 11 which is when compiling and executing them with JDK 11 works just fine.