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Improve this question 开发者_开发知识库I know 1.3 is old as dirt, but I don't have an option of doing a jvm upgrade at this point.
Just for the record. I believe the standard encryption stuff was not introduced until Java 1.4 (JSSE). Hence you will most likely need an separate JSSE implementation, which I do not know if will be available for your 1.3 platform (which is most likely an IBM one since it is hard to upgrade).
Have you tried the 1.x branch of commons-net? I checked out the 1.5.0_RC4 tag, modified the build.xml to target 1.3 and it compiled OK. It might be worth a further look.
As a curiosity, what environment are you running in that keeps you locked in to a JVM version that has been EOL for years?
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