web.xml

A display-name element that specifies the name that tools use to identify the application.
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A set of filter elements that identify servlet filters contained in the application.
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A set of filter-mapping elements that identify which servlets will have their requests or
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responses filtered by the filters identified by the filter elements. A filter-mapping
element can define more than one servlet mapping and more than one URL pattern for a
particular filter.
A set of servlet elements that identify all the servlet instances of the application.
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A set of servlet-mapping elements that map the servlets to URL patterns. More than one
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URL pattern can be defined for a particular servlet.
A set of error-page mappings that map exception types to an HTML page, so that the HTML
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page opens when an exception of that type is thrown by the application.