The 1.5.1 version fixes some bugs , including most notably a connection starvation issue that would cause a large number of sockets stuck in CLOSE_WAIT or TIME_WAIT.

PLEASE NOTE: As of Axis2 1.5, we now require JDK 1.5 or above. JDKs 1.4 or previous are no longer supported.

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Please see the Axis Reference Library for a list of technical resources that should prove useful on this project.