Web Services是建立松散耦合的, 基于开放标准的分布式应用架构的一种新手段.
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What threads are, race conditions, thread safety and sychronization.
What a classloader is, what hierarchical classloaders are, and the common causes of a "ClassNotFoundException".
How to diagnose trouble from exception traces, what a NullPointerException (NPE) and other common exceptions are, and how to fix them.
What a web application is; what a servlet is, where classes, libraries and data go in a web application.
How to start your application server and deploy a web application on it.
What a network is, the core concepts of the IP protocol suite and the sockets API. Specifically, what is TCP/IP.
What HTTP is. The core protocol and error codes, HTTP headers and perhaps the details of basic authentication.
What XML is. Not necessarily how to parse it or anything, just what constitutes well-formed and valid XML.
look at the url:http://ws.apache.org/axis/java/install.html