Some good books on java concurrency

Java Concurrency in practise 
by Brian Goetz and others














Concurrent Programming in java
 Doug Lea

(Though old now, it is still good. The author is God of Concurrency in java but this book is written by a genius but not so good author)










Art of multiprocessing programming
- Maurice Herlihy












Effective Java 
  by Joshua Bloch

Though this book is mainly about good practices in java, still it has some good practices which will help you in writing concurrent code.