EjbArticles from java world 

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''Java theory and practice:'' '''Concurrent collections classes'''

ConcurrentHashMap and CopyOnWriteArrayList offer thread safety and improved scalability

Level: Introductory

http://www-106.ibm.com/developerworks/java/library/j-jtp07233.html?open&ca=dgr-jw12j-jtp07233

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