To put it another way, there is a mismatch between source and target Java versions.Ĭhanging options in Eclipse menus don't answer the original poster, who said he/she is not using Eclipse. It needs to be "crosscompiled" for backward compatibility. However selecting the right version of Java (newer) with update-alternatives should work.Īs answered elsewhere by several people, the Java program is being run on an older version of Java than the one it was compiled it for.
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