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By utakapp
via jroller.com
Published: Feb 22 2008 / 09:35

The high complexity in our Java open source environment changes easy things to do, like migrating from java 1.5 to java 1.6, to a complex issue. These complexities need tools for collaborating in teams and in the Java community as a whole.
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jtheory replied ago:

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I'm curious to know some of the problems people see when upgrading -- I've needed to put a decent amount of work into continuing support of *old* JVMs, but normally I can slap in whatever JARs I find into any project with whatever current JVM, no matter how old they are, and they'll work with no problems.

The JREs are still largely backwards-compatible even to 1.0.2 code -- I imagine there are some exceptions, but I haven't hit them personally.

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utakapp replied ago:

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There seem to occur problems if you instantiate a class dynamically by a factory when the factory is compiled with java 1.5 while the instantiated class is compiled with java 1.6.

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