## Package javax.servlet

The javax.servlet package contains a number of classes and interfaces that describe and define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container.

See:
Description

Interface Summary
AsyncContext: Class representing the execution context for an asynchronous operation that was initiated on a ServletRequest.
AsyncIOInputSource: This interface defines methods to allow an `ServletInputStream` or `ServletReader` to notify the developer when and how much data is ready to be read without blocking.
AsyncIOOutputSink: This interface defines methods to allow an `ServletOutputStream` or `ServletWriter` to allow the developer to check with the runtime whether or not it's possible to write data, or if it's not possible, to be notified when it is.
AsyncListener: Listener that will be notified in the event that an asynchronous operation initiated on a ServletRequest to which the listener had been added has completed, timed out, or resulted in an error.
Filter: A filter is an object that performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both.
FilterChain: A FilterChain is an object provided by the servlet container to the developer giving a view into the invocation chain of a filtered request for a resource.
FilterConfig: A filter configuration object used by a servlet container to pass information to a filter during initialization.
FilterRegistration: Interface through which a `Filter` may be further configured.
FilterRegistration.Dynamic: Interface through which a `Filter` registered via one of the `addFilter` methods on `ServletContext` may be further configured.
ReadListener: This class represents a call-back mechanism that will notify implementations as HTTP request data becomes available to read without blocking.
Registration: Interface through which a `Servlet` or `Filter` may be further configured.
Registration.Dynamic: Interface through which a `Servlet` or `Filter` registered via one of the `addServlet` or `addFilter` methods, respectively, on `ServletContext` may be further configured.
RequestDispatcher: Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server.
Servlet: Defines methods that all servlets must implement.
ServletConfig: A servlet configuration object used by a servlet container to pass information to a servlet during initialization.
ServletContainerInitializer: Interface which allows a library/runtime to be notified of a web application's startup phase and perform any required programmatic registration of servlets, filters, and listeners in response to it.
ServletContext: Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME type of a file, dispatch requests, or write to a log file.
ServletContextAttributeListener: Interface for receiving notification events about ServletContext attribute changes.
ServletContextListener: Interface for receiving notification events about ServletContext lifecycle changes.
ServletRegistration: Interface through which a `Servlet` may be further configured.
ServletRegistration.Dynamic: Interface through which a `Servlet` registered via one of the `addServlet` methods on `ServletContext` may be further configured.
ServletRequest: Defines an object to provide client request information to a servlet.
ServletRequestAttributeListener: Interface for receiving notification events about ServletRequest attribute changes.
ServletRequestListener: Interface for receiving notification events about requests coming into and going out of scope of a web application.
ServletResponse: Defines an object to assist a servlet in sending a response to the client.
SessionCookieConfig: Class that may be used to configure various properties of cookies used for session tracking purposes.
SingleThreadModel: Deprecated. As of Java Servlet API 2.4, with no direct replacement.
WriteListener: Callback notification mechanism that signals to the developer it's possible to write content.

Class Summary
AsyncEvent: Event that gets fired when the asynchronous operation initiated on a ServletRequest (via a call to `ServletRequest.startAsync()` or `ServletRequest.startAsync(ServletRequest, ServletResponse)`) has completed, timed out, or produced an error.
GenericServlet: Defines a generic, protocol-independent servlet.
HttpConstraintElement: Java Class representation of an `HttpConstraint` annotation value.
HttpMethodConstraintElement: Java Class represntation of an `HttpMethodConstraint` annotation value.
MultipartConfigElement: Java Class represntation of an `MultipartConfig` annotation value.
ServletContextAttributeEvent: Event class for notifications about changes to the attributes of the ServletContext of a web application.
ServletContextEvent: This is the event class for notifications about changes to the servlet context of a web application.
ServletInputStream: Provides an input stream for reading binary data from a client request, including an efficient `readLine` method for reading data one line at a time.
ServletOutputStream: Provides an output stream for sending binary data to the client.
ServletReader
ServletRequestAttributeEvent: This is the event class for notifications of changes to the attributes of the servlet request in an application.
ServletRequestEvent: Events of this kind indicate lifecycle events for a ServletRequest.
ServletRequestWrapper: Provides a convenient implementation of the ServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet.
ServletResponseWrapper: Provides a convenient implementation of the ServletResponse interface that can be subclassed by developers wishing to adapt the response from a Servlet.
ServletSecurityElement: Java Class represntation of a `ServletSecurity` annotation value.
ServletWriter

Enum Summary
DispatcherType: Enumeration of filter dispatcher types.
SessionTrackingMode: Enumeration of session tracking modes.

Exception Summary
ServletException: Defines a general exception a servlet can throw when it encounters difficulty.
UnavailableException: Defines an exception that a servlet or filter throws to indicate that it is permanently or temporarily unavailable.

## Package javax.servlet Description

The javax.servlet package contains a number of classes and interfaces that describe and define the contracts between a servlet class and the runtime environment provided for an instance of such a class by a conforming servlet container.

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