Class JspServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.jasper.servlet.JspServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class JspServlet
extends javax.servlet.http.HttpServlet

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.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	CHAR_LIMIT
private javax.servlet.ServletConfig	config
private javax.servlet.ServletContext	context
private AtomicInteger	countErrors
private HashSet<String>	httpMethodsSet
private String	httpMethodsString
private JspProbeEmitter	jspProbeEmitter
private static Logger	log
private Options	options
private JspRuntimeContext	rctxt
private ConcurrentHashMap<String,URL>	tagFileJarUrls
private ConcurrentHashMap<String, javax.servlet.jsp.tagext.TagLibraryInfo>	taglibs

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	getJspErrorCount()	Gets the number of errors triggered by JSP invocations.
int	getJspReloadCount()	Gets the number of JSPs that have been reloaded.
private void	incrementErrorCount(String jspUri)
void	init(javax.servlet.ServletConfig config)
(package private) boolean	preCompile(javax.servlet.http.HttpServletRequest request)	Look for a precompilation request as described in Section 8.4.2 of the JSP 1.2 Specification.
void	service(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
private void	serviceJspFile(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String jspUri, Throwable exception, boolean precompile)
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 Object

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

Field Details

log

private static Logger log

CHAR_LIMIT

private static final int CHAR_LIMIT

See Also:

• Constant Field Values

context

private javax.servlet.ServletContext context

config

private javax.servlet.ServletConfig config

options

private Options options

rctxt

private JspRuntimeContext rctxt

countErrors

private AtomicInteger countErrors

httpMethodsString

private String httpMethodsString

httpMethodsSet

private HashSet<String> httpMethodsSet

taglibs

private ConcurrentHashMap<String, javax.servlet.jsp.tagext.TagLibraryInfo> taglibs

tagFileJarUrls

private ConcurrentHashMap<String,URL> tagFileJarUrls

jspProbeEmitter

private JspProbeEmitter jspProbeEmitter

Constructor Details

JspServlet

public JspServlet()

Method Details

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.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

getJspErrorCount

public int getJspErrorCount()

Gets the number of errors triggered by JSP invocations.

Returns:

The number of errors triggered by JSP invocations

preCompile

boolean preCompile(javax.servlet.http.HttpServletRequest request)
            throws javax.servlet.ServletException

Look for a precompilation request as described in Section 8.4.2 of the JSP 1.2 Specification. WARNING - we cannot use request.getParameter() for this, because that will trigger parsing all of the request parameters, and not give a servlet the opportunity to call request.setCharacterEncoding() first.

Parameters:

request - The servlet requset we are processing

Throws:

javax.servlet.ServletException - if an invalid parameter value for the jsp_precompile parameter name is specified

service

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

Overrides:

service in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

IOException

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class javax.servlet.GenericServlet

serviceJspFile

private void serviceJspFile(javax.servlet.http.HttpServletRequest request,
 javax.servlet.http.HttpServletResponse response,
 String jspUri,
 Throwable exception,
 boolean precompile)
                     throws javax.servlet.ServletException,
IOException

Throws:

javax.servlet.ServletException

IOException

incrementErrorCount

private void incrementErrorCount(String jspUri)