Java Question PARSE ERROR: unsupported class file version 52.0


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I compiled a library in Eclipse and exported it to b4a . I ensured no error in Eclipse code and generated the jar and xml files. but as I used it and ran the project on emulator I got the following error:

unsupported class file version 52.0
...while parsing jbc/jbc.class
1 error; aborting

I have read that it is because of JDK (1.8 vs 1.7) incompatibility. I wonder what to do to correct this error:(
What could I have missed:rolleyes:?
Edit: I also ensured that it is running as a Java Application inside Eclipse IDE with some modifications