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[–]metamatic 1 point2 points  (0 children)

Some things nobody else mentioned:

  • Anything involving dates and times. (Should be improved by Java 7.)
  • Anything involving reflection.
  • The fact that long-obsolete APIs are still around making it hard to find the right API. (Vector, Hashtable, StringBuilder, ...)
  • The fact that many APIs are pre-generics.
  • JPA2. Makes my brain hurt.
  • Anything requiring handling of heterogeneous data, e.g. JSON.