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In Helios, the JDT compiler new settings and different behaviour for old settings - e.g. @SuppressWarnings("unchecked") - since some projects have their prefs checked-in, there will be different warnings depending on whether or not the IDE is Galileo- or Helios-based We should review these settings once use of Helios-based IDE is wide-spread amongst the committers.
The difference between 'unchecked' and 'rawtypes' requires one to change the @SuppressWarning annotation in source, which could be in alot of places. Instead, previous behaviour can be maintained with an added system property in the eclipse.ini: -DsuppressRawWhenUnchecked=true
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink