Why does mvn always install a new jar file when the original jar file did not change? Would be nice if it could skip this step to speed up large multi-module builds when only single module (or few modules) have changes.

Same goes for handling copying resources... seems like mvn spends a bunch of time copying them (usually when filtering is enabled) when there are no changes to be made. In Ant terms I could have use a n uptodate task and a linked target to only copy (or install) these things when something has changed.

Why has Maven moved away from this kind of handling of build tasks? Re-running a build takes much, much longer than is really needed in many cases, especially when only a class here and there is changed.

Are there any plans to address some of these issues and hopefully speed up rebuilds for Maven projects?

--jason

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