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J2SE 5.0 support (Cheetah) doesn't install on Eclipse 3.0.1 (using integrated "Help/Software Updates" feature), because it requires version 3.0.0.
The separate Cheetah preview got discontinued, as the Cheetah codebase got integrated in 3.1 development cycle. So the preferrable way to enable 1.5 features is to use a recent 3.1 integration build.
Also note that many improvements occurred to Cheetah in 3.1 deliveries (i.e. separate Cheetah06 is obsolete)
*** Bug 76450 has been marked as a duplicate of this bug. ***