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By default maven is setup to pick up any new snapshot available after 24h passed. This means that when I open up an old workspace this can lead to pretty bad surprises when I just want to look at some code. Also there are concerns where some snapshot dependencies of things in the workspace may not aligned. For example a core project would use older versions of dependencies because it got imported at a certain time, but then the UI project would bring dependencies that are not aligned with the ones from the core thus resulting in potential compile errors or errors at runtime.
m2e does not update snapshot dependencies of workspace projects by default any more, but it will properly update all workspace projects that use the same snapshot dependencies when snapshot update is explicitly asked by the user.
Moved to https://github.com/eclipse-m2e/m2e-core/issues/