The best replacement for jena is sesame.

The best alternatives to jena are rated as following:
★★★★★  sesame
★★★★  owl api
★★★  virtuoso
★★  erfurt
★★  zwickau
★★  magdeburg
★  jess
  jena
  lila
  vidalia

Your alternative for jena is not listed? Suggest!
Speaking about jena, one probably shouldn't forget about pellet.

Other search terms related to jena and their ratings are:
★★★★★ pellet
★★★★★ protege
★★★ sparql
You have in mind a companion for jena and it is not yet here? Propose!



Google Trends

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jena
sesame
owl api