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I find this discussion of Java backward compatibility odd.  I remember several discussions on midrange.com about having to change the classpath to point to an old version of Java because some software or another wouldn't work it the newer version.

On 10/31/2019 12:17 PM, D*B wrote:
<Mark>
It was my impression that original Java won't run on modern JVM's because
somewhere around Java 4 or was it Java 2, there were significant breaking
changes such that you had to have a different JVM to run the new java vs.
the old java.
</Mark>

I don't remember exactly: AppServer4RPG was written using Java 1.3 or Java 1.4. ArdGate was published in 2010 based on Java 1.4. Later on I moved to Java5, basically to get advantage of Java generic types. Up to now it would still run on Java 5, because my as400 used for deployment is running with Java 5 (Os/400 V5 R2). I'm using recent java versions for development, for deployment it's compiled with Java 5 compatibility. In test environments I'm using recent java versions. The only problems I saw, where related to MS SQL driver dependencies, maybe a little bit tricky, but all solvable. I didn't receive a single bug report, related to java version problems and there are some hundreds of installations outside.

D*B




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