A Java programming language object that implements the behavior of a custom tag.
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In Advanced Java, particularly in the context of JavaServer Pages (JSP), a JSP tag handler is a Java class that is used to implement custom tags. JSP custom tags are extensions to the standard set of JSP tags, allowing developers to create their own tags to encapsulate specific functionality or logic.

JSP tag handlers are part of the Java Standard Tag Library (JSTL) and provide a way to define custom actions in JSP pages. These custom actions are often more powerful and flexible than standard JSP tags.

The process involves defining a tag library descriptor (TLD) that specifies the custom tags and their corresponding tag handlers. The tag handler class is responsible for handling the behavior associated with the custom tag when the JSP page is executed.

In summary, a JSP tag handler is a Java class that implements the logic associated with a custom tag defined in a JSP page. This enables developers to create reusable and modular components to enhance the functionality of JSP pages.