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A NullPointerException is the Java class name for a Java Exception which is thrown when an application tries to use a method on an uninitialized (or empty) object. In English, this is similar to receiving a letter asking you to fill out the enclosed questionnaire, but there is no enclosed questionnaire. You can't perform a task on an object that doesn't exist.

Technically, Java objects are pointers to areas in memory. When an object is uninitialized, it's value as far as the machine is concerned is zero, or null.

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« This particular version was published on 09-Jun-2005 22:13 by