Have jre7; JAR is jre6 compiled; can't run

Asked Sep 17 '12 at 02:16

Active Sep 17 '12 at 02:28

Viewed 613 times

I built a JAR in NetBeans, setting the Source/Binary Format to JDK6. So it's compiled to jre6. I can use the JAR (outside the IDE), but if I send it to a machine with jre7, I have to alter the environment variable to get it to execute from the JAR.

Isn't Java backwards compatible? Shouldn't this work without effort on jre7? I am not doing -anything- fancy in this program. It's a few kilobytes, couple hundred lines, import on some Map classes from java.util.
Is there a command-line option for java to use an older runtime, or an annotation to write in, to identify the class files as version 6?

Embarrassed I can't find specs to answer these questions.

edited Sep 17 '12 at 02:28

Philip Whitehouse

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asked Sep 17 '12 at 02:16

JasonDAquila

Yes, Java is backwards compatible. The "old" jar should work. What kind of error do you get? – Thilo Sep 17 '12 at 02:31
thanks for the formatting. I checked again and ... it worked. So umm. Not reproducible. I don't know? – JasonDAquila Sep 22 '12 at 16:06

Have jre7; JAR is jre6 compiled; can't run

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