What are best development practices for multi JRE version support?

Compile most of your code as 1.5. Have a separate source directory for 1.6-specific code. The 1.6 source should depend upon the 1.5, but not vice-versa. Interfacing to the 1.6 code should be done by subtyping types from the 1.5 code.

The 1.5 code may have an alternative implementation rather than checking for null everywhere.

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