amabas.blogg.se - Apache common jar files download

How to diagnose trouble from exception traces, what a NullPointerException (NPE) and other common exceptions are, and how to fix them.

What a classloader is, what hierarchical classloaders are, and the common causes of a "ClassNotFoundException".

What threads are, race conditions, thread safety and sychronization.

Core Java datatypes, classes and programming concepts.

Things you need to know before writing a Web Service:

While you can learn about SOAP as you go along, writing Axis clients and servers is not the right time to be learning foundational Java concepts, such as what an array is, or basic application server concepts such as how servlets work, and the basics of the HTTP protocol. A lot of problems with Axis are encountered by people who are new to Java, server-side Java and SOAP.