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org.apache.tester
Class Lifecycle03  

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.apache.tester.Lifecycle03

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

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public class Lifecycle03

extends javax.servlet.http.HttpServlet

Test for servlet lifecycle management. It's behavior is controlled by a request parameter step, which must be set to one of the following values:

• 1 - Throw an UnavailableException that indicates permanent unavailablility, which should cause this servlet instance to be destroyed and thrown away.
• 2 - Check the lifecycle variables to ensure that the old instance was not reused.

Version:

$Revision: 302726 $ $Date: 2004-02-27 09:59:07 -0500 (Fri, 27 Feb 2004) $

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Field Summary
private  java.lang.String	instanceTrail
private static java.lang.String	staticTrail

 

Fields inherited from class javax.servlet.http.HttpServlet

 

Fields inherited from class javax.servlet.GenericServlet

 

Constructor Summary

Lifecycle03()

 

Method Summary
void	destroy()           Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
void	doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)           Called by the server (via the service method) to allow a servlet to handle a GET request.
void	init()           A convenience method which can be overridden so that there's no need to call super.init(config).

 

Methods inherited from class javax.servlet.http.HttpServlet

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

 

Field Detail

staticTrail

private static java.lang.String staticTrail

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instanceTrail

private java.lang.String instanceTrail

Constructor Detail

Lifecycle03

public Lifecycle03()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

Description copied from class: javax.servlet.GenericServlet

A convenience method which can be overridden so that there's no need to call super.init(config).

Instead of overriding GenericServlet.init(ServletConfig)>GenericServlet.init(ServletConfig) 55 , simply override this method and it will be called by GenericServlet.init(ServletConfig config). The ServletConfig object can still be retrieved via GenericServlet.getServletConfig()>GenericServlet.getServletConfig() 55 .

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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()>Servlet.destroy() 55 .

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doGet

public void doGet(javax.servlet.http.HttpServletRequest request,
                  javax.servlet.http.HttpServletResponse response)
           throws java.io.IOException,
                  javax.servlet.ServletException

Description copied from class: javax.servlet.http.HttpServlet

Called by the server (via the service method) to allow a servlet to handle a GET request.

Overriding this method to support a GET request also automatically supports an HTTP HEAD request. A HEAD request is a GET request that returns no body in the response, only the request header fields.

When overriding this method, read the request data, write the response headers, get the response's writer or output stream object, and finally, write the response data. It's best to include content type and encoding. When using a PrintWriter object to return the response, set the content type before accessing the PrintWriter object.

The servlet container must write the headers before committing the response, because in HTTP the headers must be sent before the response body.

Where possible, set the Content-Length header (with the ServletResponse.setContentLength(int)>ServletResponse.setContentLength(int) 55 method), to allow the servlet container to use a persistent connection to return its response to the client, improving performance. The content length is automatically set if the entire response fits inside the response buffer.

When using HTTP 1.1 chunked encoding (which means that the response has a Transfer-Encoding header), do not set the Content-Length header.

The GET method should be safe, that is, without any side effects for which users are held responsible. For example, most form queries have no side effects. If a client request is intended to change stored data, the request should use some other HTTP method.

The GET method should also be idempotent, meaning that it can be safely repeated. Sometimes making a method safe also makes it idempotent. For example, repeating queries is both safe and idempotent, but buying a product online or modifying data is neither safe nor idempotent.

If the request is incorrectly formatted, doGet returns an HTTP "Bad Request" message.

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