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Editorial Team
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Asked: 2026-05-22T20:54:07+00:00

May I know if there are any issues running a Java 5-compiled code (with

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May I know if there are any issues running a Java 5-compiled code (with Java 1.3 source/target compliance) on a Java 1.3 JVM?

I know this is quite odd, but most of our customers are on Java 5 but we are restricted by a few still on Java 1.3 due to conditions beyond our control. Our CI tool uses Java 5 compiler but we set our source and target compliance to Java 1.3 for backward compatibility. We are not using Java 1.3 for CI because there are unit tests that does not compile on 1.3.

Will this be an issue?

Thank you in advance!

Cheers,
– Paul

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1 Answer

  1. Editorial Team

    The only way to get the compiler to check that source in your app. only uses 1.3 methods is to specify a -bootclasspath pointing to a 1.3 rt.jar. Note you can get that from a 1.3 JRE, it does not require a 1.3 SDK/compiler. Of course, specify a -target of 1.3.

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