What is the most useful multi-purpose open-source library for java?

Question :

What is the most useful multi-purpose open-source library for java?,

Answer :

Are there any open-source libraries that all programmers should know about? I’m thinking
something general, a sort of extension to the standard java.util that contains basic functions that are useful for all kinds of application.

,

  • Apache Commons
  • Log4j
  • Google collections

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