Java Question Java 8

Johan Schoeman

Johan Schoeman

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I am trying to use Java Open JDK 8 so that I can use Simple Library Compiler but when I compile a B4A project (configure path is set to javac.exe in the bin folder of JDK 8) I get the following error. Please assist with a solution. Should I use a different version of Java 8? I have also tried the download from Oracle and it creates the same error.

B4X: 
Could not load processor class file due to 'androidx/lifecycle/LifecycleProcessor has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0'.

This is the download that I am using:

openlogic-openjdk-8u432-b06-windows-x64
 
teddybear

teddybear

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What external libraries are included in the library you want to compile using Simple Library Compiler? it seems that there is a class compiled by JDK 17.
 
Johan Schoeman

Johan Schoeman

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teddybear said:
What external libraries are included in the library you want to compile using Simple Library Compiler? it seems that there is a class compiled by JDK 17.
Click to expand...
It is an old project from about 2016. It used to compile in B4A when pointing to Java 8 but now not unless I point to Java 14 or Java 19. I have only installed Java 8 today on a different laptop than what I used to have.
 

drgottjr

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as @teddybear comments, something in your project was built with java 17 (https://javaalmanac.io/bytecode/versions/).
it's not going to run on a jre for java 8. jre's are backward(ly) compatible, not vice versa.

@Daestrum posted a workaround for using slc with java versions 11+. i've used it, but i couldn't find it just now
when using the forum search. btw, i thought you could use newer java versions with slc; it was the .xml file generated
that didn't come out right. i seem to recall it working otherwise.
 

Johan Schoeman

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I can compile the Java lib with SLC when pointing to Java 8 but must then point to Java 19 to be able to use it in B4A.
 

Daestrum

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You could try my version of SLC (It's still pretty rough as I stopped development as no-one seemed interested in it) it will use whichever Java you choose (and have installed).
 
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