Hello. > Using openjdk11 here will create warnings in dependents I think. Are > you sure we really need to use it? Unfortunately when the JDK version is not specified I get errors like this one during the "check" phase: --8<---------------cut here---------------start------------->8--- starting phase `check' Buildfile: /tmp/guix-build-java-lambdatest-0.7.1.drv-0/source/build.xml compile-tests: [mkdir] Created dir: /tmp/guix-build-java-lambdatest-0.7.1.drv-0/source/build/test-classes [javac] Compiling 13 source files to /tmp/guix-build-java-lambdatest-0.7.1.drv-0/source/build/test-classes [javac] Note: Some input files use unchecked or unsafe operations. [javac] Note: Recompile with -Xlint:unchecked for details. BUILD SUCCESSFUL Total time: 0 seconds [TestNG] [ERROR] An error occurred while instantiating class de.tobiasroeser.lambdatest.ExpectCollectionTest: org/slf4j/impl/StaticLoggerBinder has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0 --8<---------------cut here---------------end--------------->8--- - Artyom -- Artyom "avp" Poptsov Home page: https://memory-heap.org/~avp/ CADR Hackerspace co-founder: https://cadrspace.ru/ GPG: D0C2 EAC1 3310 822D 98DE B57C E9C5 A2D9 0898 A02F