Eclipse: Build and conform to different JRE versions

Question

Is there a way to build my app using one version of the JRE but have my source conform to another version?

I would like to debug my app locally using 1.6 because OS X's 1.6 is much better than 1.4.2, but because of backwards compatibility reasons we actually ship using 1.4.2.

Answer 1

You can manage this though the Run Configurations options. Create a new Run Configuration --> Java Application and then you can specify the JRE you want to use for that configuration.

Answer 2

Or can change your Run configuration, but you can also change your project properties to do this too so any class you decide to run will do this.