Tutorial by Topics: javac



Documentation for java code is often generated using javadoc. Javadoc was created by Sun Microsystems for the purpose of generating API documentation in HTML format from java source code. Using the HTML format gives the convenience of being able to hyperlink related documents together.

In order to use custom tags in JSP,we used to have TLD files,along with a Java class to define the custom tags but post JSP 2.0 specs,the same can be achieved,without the need for any Source code files,making it easy to maintain and it can also be created by someone with basic knowledge of JSP tags without need for java code.

The basic thing to remember here is that debugging a Hadoop MR job is going to be similar to any remotely debugged application in Eclipse.

A debugger or debugging tool is a computer program that is used to test and debug other programs (the “target” program). It is greatly useful specially for a Hadoop environment wherein there is little room for error and one small error can cause a huge loss.


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