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Exported jar files not working [message #1856867]

Fri, 06 January 2023 07:40

Ercole Spiteri

Messages: 1
Registered: January 2023

Junior Member

I installed eclipse on my system and the programs which I write run fine in the Eclipse IDE but when exported into a standalone jar file the created jar file will not work. If I try to run it from the command prompt with java -jar <jar filename> it tells me that the file was built with version 61 and the java version I have is 52 something. I installed the latest java runtime files so what I have wrong?

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Re: Exported jar files not working [message #1856884 is a reply to message #1856867]

Sat, 07 January 2023 07:09

Ed Merks

Messages: 33264
Registered: July 2009

Senior Member

The class versions, according to this:

https://en.wikipedia.org/wiki/Java_version_history

suggest that you are trying to run .class files compiled for Java 17 on a Java 8 runtime.

So either install and use Java 17 to run the jar:

https://adoptium.net/

Or configure the IDE to target Java 8 as the runtime via Window -> Preferences -> Java -> Compiler.

Ed Merks
Professional Support: https://www.macromodeling.com/

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