| Interface | Description | 
|---|---|
| AsyncContext | Class representing the execution context for an asynchronous operation that was initiated on a ServletRequest. | 
| 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  Filtermay be further configured. | 
| FilterRegistration.Dynamic | Interface through which a  Filterregistered via one of the addFilter methods onServletContextmay be further configured. | 
| ReadListener | 
 This class represents a call-back mechanism that will notify implementations as HTTP request data becomes available
 to be read without blocking. | 
| Registration | |
| Registration.Dynamic | Interface through which a  ServletorFilterregistered via one of the addServlet or
 addFilter methods, respectively, onServletContextmay 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. | 
| ServletConnection | Provides information about the connection made to the Servlet container. | 
| 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  Servletmay be further configured. | 
| ServletRegistration.Dynamic | Interface through which a  Servletregistered via one of the addServlet methods onServletContextmay 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. | 
| WriteListener | Callback notification mechanism that signals to the developer it's possible to write content without blocking. | 
| Class | Description | 
|---|---|
| AsyncEvent | Event that gets fired when the asynchronous operation initiated on a ServletRequest (via a call to
  ServletRequest.startAsync()orServletRequest.startAsync(ServletRequest, ServletResponse)) has
 completed, timed out, or produced an error. | 
| GenericFilter | 
 Defines a generic, protocol-independent filter. | 
| GenericServlet | Defines a generic, protocol-independent servlet. | 
| HttpConstraintElement | Java Class representation of an  HttpConstraintannotation value. | 
| HttpMethodConstraintElement | Java Class representation of an  HttpMethodConstraintannotation value. | 
| MultipartConfigElement | Java Class represntation of an  MultipartConfigannotation 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  readLinemethod for reading data one line at a time. | 
| ServletOutputStream | Provides an output stream for sending binary data to the client. | 
| 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 representation of a  ServletSecurityannotation value. | 
| Enum | Description | 
|---|---|
| DispatcherType | Enumeration of filter dispatcher types. | 
| SessionTrackingMode | Enumeration of session tracking modes. | 
| Exception | Description | 
|---|---|
| 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. |