Package org.apache.jasper.servlet

Class JspServlet

java.lang.Object
jakarta.servlet.GenericServlet
jakarta.servlet.http.HttpServlet
org.apache.jasper.servlet.JspServlet
All Implemented Interfaces:
jakarta.servlet.Servlet, jakarta.servlet.ServletConfig, Serializable, PeriodicEventListener
public class JspServlet extends jakarta.servlet.http.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:

  • Field Summary

    Fields inherited from class jakarta.servlet.http.HttpServlet

    LEGACY_DO_HEAD

  • Constructor Summary

    Constructors
    Constructor
    Description
    JspServlet()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    destroy()
     
    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.
    int
    getJspQueueLength()
    Gets the number of JSPs that are in the JSP limiter queue
    int
    getJspReloadCount()
    Gets the number of JSPs that have been reloaded.
    int
    getJspUnloadCount()
    Gets the number of JSPs that have been unloaded.
    void
    init(jakarta.servlet.ServletConfig config)
     
    void
    periodicEvent()
    Execute a periodic task, such as reloading, etc.
    void
    service(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)
     
    void
    setJspReloadCount(int count)
    Resets the JSP reload counter.

    Methods inherited from class jakarta.servlet.http.HttpServlet

    doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service

    Methods inherited from class jakarta.servlet.GenericServlet

    getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • JspServlet

      public JspServlet()

  • Method Details

    • init

      public void init(jakarta.servlet.ServletConfig config) throws jakarta.servlet.ServletException
      Specified by:
      init in interface jakarta.servlet.Servlet
      Overrides:
      init in class jakarta.servlet.http.HttpServlet
      Throws:
      jakarta.servlet.ServletException

    • 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(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response) throws jakarta.servlet.ServletException, IOException
      Overrides:
      service in class jakarta.servlet.http.HttpServlet
      Throws:
      jakarta.servlet.ServletException
      IOException

    • destroy

      public void destroy()
      Specified by:
      destroy in interface jakarta.servlet.Servlet
      Overrides:
      destroy in class jakarta.servlet.GenericServlet

    • periodicEvent

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