[jbossws-dev] [Design of JBoss Web Services] - Re: Why is the UMDM using ConcurrentHashMap?

[jason.greene@jboss.com]

The ConcurrentHashMap change was not merged to 1.2.0, and I left it out when i merged the log changes it was bundled with.

Anyway there is no way that ConcurrentHashMap could have reduced synchronization since it *adds* synchronization.

Removing synchronization was one of the big reasons for the Java collection types in 1.2. Only the pre 1.2 collection types synchronized all methods (Hashtable and Vector). 

If you still don't believe me, read the javadoc
http://java.sun.com/j2se/1.5.0/docs/api/java/util/HashMap.html

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