Class JspServlet

java.lang.Object
jakarta.servlet.GenericServlet
jakarta.servlet.http.HttpServlet
org.apache.jasper.servlet.JspServlet
All Implemented Interfaces:
Servlet, ServletConfig, Serializable, PeriodicEventListener
public class JspServlet extends HttpServlet implements PeriodicEventListener
The JSP engine (a.k.a Jasper). The servlet container is responsible for providing a URLClassLoader for the web application context Jasper is being used in. Jasper will try get the Tomcat ServletContext attribute for its ServletContext class loader, if that fails, it uses the parent class loader. In either case, it must be a URLClassLoader.
Author:
Anil K. Vijendran, Harish Prabandham, Remy Maucherat, Kin-man Chung, Glenn Nielsen
See Also:

  • Constructor Details

    • JspServlet

      public JspServlet()

  • Method Details

    • init

      public void init(ServletConfig config) throws ServletException
      Description copied from class: jakarta.servlet.GenericServlet
      Called by the servlet container to indicate to a servlet that the servlet is being placed into service. See Servlet.init(jakarta.servlet.ServletConfig).

      This implementation stores the ServletConfig object it receives from the servlet container for later use. When overriding this form of the method, call super.init(config).

      Specified by:
      init in interface Servlet
      Overrides:
      init in class HttpServlet
      Parameters:
      config - the ServletConfig object that contains configuration information for this servlet
      Throws:
      ServletException - if an exception occurs that interrupts the servlet's normal operation
      See Also:

    • getJspCount

      public int getJspCount()
      Returns the number of JSPs for which JspServletWrappers exist, i.e., the number of JSPs that have been loaded into the webapp with which this JspServlet is associated.

      This info may be used for monitoring purposes.

      Returns:
      The number of JSPs that have been loaded into the webapp with which this JspServlet is associated

    • setJspReloadCount

      public void setJspReloadCount(int count)
      Resets the JSP reload counter.
      Parameters:
      count - Value to which to reset the JSP reload counter

    • getJspReloadCount

      public int getJspReloadCount()
      Gets the number of JSPs that have been reloaded.

      This info may be used for monitoring purposes.

      Returns:
      The number of JSPs (in the webapp with which this JspServlet is associated) that have been reloaded

    • getJspQueueLength

      public int getJspQueueLength()
      Gets the number of JSPs that are in the JSP limiter queue

      This info may be used for monitoring purposes.

      Returns:
      The number of JSPs (in the webapp with which this JspServlet is associated) that are in the JSP limiter queue

    • getJspUnloadCount

      public int getJspUnloadCount()
      Gets the number of JSPs that have been unloaded.

      This info may be used for monitoring purposes.

      Returns:
      The number of JSPs (in the webapp with which this JspServlet is associated) that have been unloaded

    • service

      public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
      Description copied from class: jakarta.servlet.http.HttpServlet
      Receives standard HTTP requests from the public service method and dispatches them to the doMethod methods defined in this class. This method is an HTTP-specific version of the Servlet.service(jakarta.servlet.ServletRequest, jakarta.servlet.ServletResponse) method. There's no need to override this method.
      Overrides:
      service in class HttpServlet
      Parameters:
      request - the HttpServletRequest object that contains the request the client made of the servlet
      response - the HttpServletResponse object that contains the response the servlet returns to the client
      Throws:
      ServletException - if the HTTP request cannot be handled
      IOException - if an input or output error occurs while the servlet is handling the HTTP request
      See Also:

    • destroy

      public void destroy()
      Description copied from class: jakarta.servlet.GenericServlet
      Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. See Servlet.destroy().
      Specified by:
      destroy in interface Servlet
      Overrides:
      destroy in class GenericServlet

    • periodicEvent

      public void periodicEvent()
      Description copied from interface: PeriodicEventListener
      Execute a periodic task, such as reloading, etc.
      Specified by:
      periodicEvent in interface PeriodicEventListener