Solr

http://lucene.apache.org/solr/

unit tests

ant+junit

https://docs.google.com/viewer?a=v&q=cache:O-kAlII3y2gJ:java.sun.com/developer/Books/javaprogramming/ant/ant_chap04.pdf+&hl=bg&gl=bg&pid=bl&srcid=ADGEESigWanupUAOJYWZ3l11DpR1AW7WjHtNflblUSANKOswbUDXHwRVeYPhRETSNbj-rFa9MWrwWNFOc-gqDZORxobDPvLi3rq33UVRQ-VUn_8Z2_Df8FWRwdgYth1W6l1g9rLg0H7f&sig=AHIEtbTXt04xfhTM9yNep09IqsY_1YGl-Q&pli=1

concurrency utils

edu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicBoolean