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1) This lock interface recipe implements the lock recipe
mentioned in ../../docs/recipes.[html,pdf].

2) To compile the lock java recipe you can just run ant jar from 
this directory. For compiling the c libarary go to zookeeper-client/zookeeper-client-c and read
the INSTALLATION instructions. 
Please report any bugs on the jira 

http://issues.apache.org/jira/browse/ZOOKEEPER