JspServlet (Apache Tomcat 8.0.53 API Documentation)

java.lang.Object
- javax.servlet.GenericServlet
- - javax.servlet.http.HttpServlet
  - - org.apache.jasper.servlet.JspServlet

All Implemented Interfaces:

java.io.Serializable, Servlet, ServletConfig, 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:
Serialized Form

Constructor Summary

Constructors
Constructor and Description

JspServlet()

Constructors
Constructor and Description
`JspServlet()`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`destroy()` Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
`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 This info may be used for monitoring purposes.
`int`	`getJspReloadCount()` Gets the number of JSPs that have been reloaded.
`int`	`getJspUnloadCount()` Gets the number of JSPs that have been unloaded.
`void`	`init(ServletConfig config)` Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
`void`	`periodicEvent()` Execute a periodic task, such as reloading, etc.
`void`	`service(HttpServletRequest request, HttpServletResponse response)` Receives standard HTTP requests from the public `service` method and dispatches them to the `do`Method methods defined in this class.
`void`	`setJspReloadCount(int count)` Resets the JSP reload counter.

Methods inherited from class javax.servlet.http.HttpServlet
doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service

Methods inherited from class javax.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 Detail
  - JspServlet
```
public JspServlet()
```
- Method Detail
  - init
```
public void init(ServletConfig config)
          throws ServletException
```
    Description copied from class: javax.servlet.GenericServlet
    
    Called by the servlet container to indicate to a servlet that the servlet is being placed into service. See Servlet.init(javax.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 GenericServlet
    
    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:
    UnavailableException
  - 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,
                    java.io.IOException
```
    Description copied from class: javax.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(javax.servlet.ServletRequest, javax.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
    
    java.io.IOException - if an input or output error occurs while the servlet is handling the HTTP request
    See Also:
    Servlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
  - destroy
```
public void destroy()
```
    Description copied from class: javax.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

Class JspServlet

Constructor Summary

Method Summary

Methods inherited from class javax.servlet.http.HttpServlet

Methods inherited from class javax.servlet.GenericServlet

Methods inherited from class java.lang.Object

Constructor Detail

JspServlet

Method Detail

init

getJspCount

setJspReloadCount

getJspReloadCount

getJspQueueLength

getJspUnloadCount

service

destroy

periodicEvent