Custom jar library cannot be accessed.

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Oy there lads and lasses! I have built a simple java action, which only returned string – this worked fine. Then, I have moved the method generating string to a jar library, added it to a classpath, moved it to userlib folder and after some struggle managed to get it imported into the TestJavaAction, which can be seen on image below: Having this code, running project locally on Mendix, app ends up with an compilation of java actions failed – saying it cannot find the library I am using in my action:   Buildfile: C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\deployment\build_core.xml compile: [javac] Compiling 54 source files to C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\deployment\run\bin [javac] C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\javasource\myfirstmodule\actions\TestJavaAction.java:14: error: cannot access WeatherApiHelper [javac] import com.internetofmine.weatherapihelper.WeatherApiHelper; [javac] ^ [javac] bad class file: C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\userlib\ApiLibTest.jar(/com/internetofmine/weatherapihelper/WeatherApiHelper.class) [javac] class file has wrong version 60.0, should be 55.0 [javac] Please remove or make sure it appears in the correct subdirectory of the classpath. [javac] C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\javasource\myfirstmodule\actions\TestJavaAction.java:34: error: cannot find symbol [javac] return WeatherApiHelper.getBoop(); [javac] ^ [javac] symbol: variable WeatherApiHelper [javac] location: class TestJavaAction [javac] Note: C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\javasource\system\UserActionsRegistrar.java uses or overrides a deprecated API. [javac] Note: Recompile with -Xlint:deprecation for details. [javac] 2 errors BUILD FAILED C:\Users\meris\Documents\Mendix\OpenWeatherApi2-main\deployment\build_core.xml:29: Compile failed; see the compiler error output for details. Total time: 2 seconds What am I doing wrong? Is there any tutorial or guide that you guys might know, that would pull me through this? Hugs o/
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1 answers
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It looks like you’ve built the jar file using Java 16, but Mendix needs to be Java 11. 

Try recompiling the jar with Java 11, it should work then.

Good luck!

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