B4X FEED Web server with B4J

[practicalsoft]

To build a web server with B4J there are some code examples in the forum:

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and

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The code worked approx. three years ago. Now I tried to make a new release with the latest B4J version. But when I start the jar file in the command line

java -jar FileServer.jar
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it says:

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: b4j/example/main 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
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What can I do?

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