JSP API

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This tutorial lists down the API’s used in the Java Server Pages (JSP) programming. API stands for Application Programming Interface that allows programmers for building software applications in java. JSP API is categorized into following packages:

Packages	Description
javax.el	It provides classes and interfaces used by JSP to evaluate expressions.
javax.servelt.jsp	It contains classes and interfaces that describe JSP page implementation.
javax.servlet.jsp.el	It contains classes ang interfaces that define JSP page implementation supported by JSP container.
javax.servlet.jsp.tagext	It is used to define tag libraries which means for identifying custom tags in JSP page.

Following sections will detail about classes and interfaces in each of the above packages:

Package javax.servlet.jsp

It contains classes and interfaces that describe JSP page implementation.

Interfaces

Interface	Description
JspPage	It contains interaction of JSP page implementation.JspPage page has following methods : JspInit:it is used to initialize JSP page. JspDestroy:It is used to remove JSP page.
HttpJspPage	It contains interaction of JSP page implementation with HTTP protocol.It has method called _jspService used to process user request.

Classes

Class	Description
JsPWriter	It is used to display contents/output in JSP page.
JspError	It is used to display errors on error pages.
JspContext	It collects information which is not a part of servlets.
JspEngineInfo	It gives information of current JSP engine.
JspFactory	It defines classes and interfaces to use JSP page implementation.
JspException	It is used to display exceptions occurred in JSP pages.

Package javax.el

This package has classes and interfaces for the expression language definitions.

Interfaces

Interface	Description
ELContextListener	It is used for receiving notification.

Classes

Classes	Description
ArrayELResolver	Performs property resolution on arrays.
BeanELResolver	Performs property resolution on JavaBeans.
CompositeELResolver	It can be used as stop condition for iterating its component resolvers.
ELContext	Stores state of EL expressions.
ELContextEvent	Indicates ELContext has been created.
ELResolver	Defines resolution rules to resolve EL expressions.
ELUtil	Defines utility methods for EL implementation.
Expression	It is base class for ValueExpression and Method Expression.
Expressionfactory	It is used to convert string into value or method expressions.
FunctionMapper	It is used to map function names and methods.
ListELResolver	Performs property resolution on objects of List class.
MapELResolver	Performs property resolution on objects of map class.
MethodExpression	It is used to parse expressions to method.
MethodInfo	It defines information about Method Expression.
ResourceBundleELResolver	Performs property resultion on objects of ResourceBundle class.
ValueExpression	It is used to parse expressions to value.
VariableMapper	It is used map between expressions and variables.

Exceptions

Exception Name	Description
ELException	Represents the exceptions occurred during evaluation of expressions.
MethodNotFoundException	It returns exception when method could not found while evaluating expressions.
PropertyNotFoundException	It returns exception when property could not found while evaluating expressions.
PropertyNotWritableException	It returns exception when property could not written to value on a ValueExpression.

Package javax.servlet.jsp.el

Interfaces

Interface Name	Description
FunctionMapper	It is used to map between function names and methods.
VariableResolver	it is used to resolve references of variables at evaluation time.

Classes

Class Name	Description
Expression	It is base class for Value Expression and Method Expression.
ExpressionEvaluator	It is used to evaluate variables and expressions at run time.
ImplicitObjectElResolver	It describes behavior of implicit objects in JSP specification.
ImplicitObjectELResolver.EnumeratedMap	It provides enumeration of keys and getValue method.
ImplicitObjectElResolver.implicitObjects	it is used to create implicit map and list objects.
ScopedAttributeELResolver	It performs property resolution on scoped attributes.

Exceptions

Exception name	Description
ELException	It represents exceptions that occurred during expression evaluation.
ELParseException	It represents parsing exceptions occurred during expression evaluation.

Package javax.servlet.jsp.tagext

This package has classes and interfaces for writing the custom tags.

Interfaces

Interface Name	Description
BodyTag	It includes contents of evaluating body.
DynamicAttributs	A tag must implement this interface to define dynamic attributes.
iterationTag	It is used to control re-evaluation of body.
JspIdConsumer	It defines ID for user provided by compiler.
JspTag	It provides base class for tag and Simpletag.
SimpleTag	It defines interface for simple tag handlers.
tag	it does not manipulate its body.
TryCatchFinally	It provides extra methods to manage resources.

Classes

Class Name	Description
BodyContent	It is a subclass of JspWriter. It has methods to convert its contents into a String, to read its contents, and to clear the contents.
BodyTagSupport	It implements the BodyTag interface and we can add additional functionalities to set property of bodyContent .
FunctionInfo	It provides information in TagLibrary.This class is instantiated from the Tag Library Descriptor file (TLD) and is available only at translation time.
Jspfragment	It is an object that represents JSP code.
PageData	It provides information on a JSP page.
SimpletagSupport	It is used as base class for simple tag handlers. It adds additional methods for the properties in SimpleTag.
TagAdapter	It is used to allow collaboration between classic Tag handlers and SimpleTag handlers.
TagAttributeInfo	It provides information on attributes of a tag.
TagData	It gives value information for a tag instance only at translation time.
TagExtraInfo	It is used to describe additional information which is not defined in TLD( Tag Library Descriptor)file.
TagFileInfo	It provides information for a tagfile in TagLibrary only at translation time.
TagInfo	It provides information for a tag in TagLibrary only at translation time.
TagLibrarynfo	It provides information associated with a taglib directive.
TagLibraryValidator	It is validator class for a JSP page and operates on the XML view associated with the JSP page.
TagSupport	It is base class for defining new tag handlers.
TagVariableInfo	It provides variable information for a tag in Tag Library only at translation time.
ValidationMessage	It display validation message from either TagLibraryValidator and TagExtraInfo.
VariableInfo	It provides information on scripting variables that are created or modified at run time.

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