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Editorial Team
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Asked: 2026-05-12T05:23:20+00:00

I’ve compiled my source with java version 1.6 using the parameters -source 1.5 and

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I’ve compiled my source with java version 1.6 using the parameters -source 1.5 and -target 1.5, and the compiler doesnt complain at all.

Still, the application won’t run with java 1.5 due to missing methods. Ofcourse I could rewrite some of my source code to be 1.5 compliant, but what I don’t understand is; shouldn’t the java bytecode in the bottom be “frontwards” compliant?

Aren’t the methods converted into bytecode? Is it possible to compile the 1.6 libs/methods (formely String.isEmpty()) to 1.5 bytecode and pack it all into the archive?

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1 Answer

  1. Editorial Team

    The full set of command line options you need are:

    java -source 1.5 -target 1.5 -bootclasspath /usr/jdk/jdk1.5.0_17/jre/lib/rt.jar

    (Change bootclasspath to however your machine is setup.)

    Of course, APIs enhancements in 1.6 will not be in 1.5. 1.5 is most of its way through its End of Service Life period, so you might want to consider a 1.6 minimum anyway.

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