write to static field from instance method

FindBugs is flagging several instances of the "Write to static field
..." error but some are categorized as "H D ST", some as "M D ST", and
the rest as "L D ST". What are the differences?

Also, why is updating a static field from an instance method such a bad
thing? Should the instance method call a (synchronized in a
multi-threaded app) static method to access a static field? What's the
recommended fix or workaround?

Thanks
Gopi

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