Package org.eclipse.jetty.server.handler

Class ErrorHandler

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.ContainerLifeCycle

org.eclipse.jetty.server.handler.AbstractHandler

org.eclipse.jetty.server.handler.ErrorHandler

All Implemented Interfaces:

Handler, org.eclipse.jetty.util.component.Destroyable, org.eclipse.jetty.util.component.LifeCycle

public class ErrorHandler
extends AbstractHandler

Handler for Error pages An ErrorHandler is registered with ContextHandler.setErrorHandler(ErrorHandler) or Server.setErrorHandler(ErrorHandler). It is called by the HttpResponse.sendError method to write a error page via handle(String, Request, HttpServletRequest, HttpServletResponse) or via badMessageError(int, String, HttpFields) for bad requests for which a dispatch cannot be done.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	ErrorHandler.ErrorPageMapper

Nested classes/interfaces inherited from class org.eclipse.jetty.server.handler.AbstractHandler

AbstractHandler.ErrorDispatchHandler

Nested classes/interfaces inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.util.component.AbstractLifeCycle.AbstractLifeCycleListener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.Container

org.eclipse.jetty.util.component.Container.InheritedListener, org.eclipse.jetty.util.component.Container.Listener

Nested classes/interfaces inherited from interface org.eclipse.jetty.util.component.LifeCycle

org.eclipse.jetty.util.component.LifeCycle.Listener

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	ERROR_PAGE

Fields inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING

Constructor Summary

Constructors

Constructor	Description
ErrorHandler()

Method Summary

Modifier and Type	Method	Description
java.nio.ByteBuffer	badMessageError(int status, java.lang.String reason, org.eclipse.jetty.http.HttpFields fields)	Bad Message Error body
void	doError(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Convenience method to generate error page.
protected void	generateAcceptableResponse(Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, int code, java.lang.String message)	Generate an acceptable error response.
protected void	generateAcceptableResponse(Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, int code, java.lang.String message, java.lang.String mimeType)	Generate an acceptable error response for a mime type.
protected java.io.Writer	getAcceptableWriter(Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Returns an acceptable writer for an error page.
java.lang.String	getCacheControl()	Get the cacheControl.
static ErrorHandler	getErrorHandler(Server server, ContextHandler context)
boolean	getShowMessageInTitle()
void	handle(java.lang.String target, Request baseRequest, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)	Handle a request.
protected void	handleErrorPage(javax.servlet.http.HttpServletRequest request, java.io.Writer writer, int code, java.lang.String message)
boolean	isShowStacks()
void	setCacheControl(java.lang.String cacheControl)	Set the cacheControl.
void	setShowMessageInTitle(boolean showMessageInTitle)
void	setShowStacks(boolean showStacks)
protected void	write(java.io.Writer writer, java.lang.String string)
protected void	writeErrorPage(javax.servlet.http.HttpServletRequest request, java.io.Writer writer, int code, java.lang.String message, boolean showStacks)
protected void	writeErrorPageBody(javax.servlet.http.HttpServletRequest request, java.io.Writer writer, int code, java.lang.String message, boolean showStacks)
protected void	writeErrorPageHead(javax.servlet.http.HttpServletRequest request, java.io.Writer writer, int code, java.lang.String message)
protected void	writeErrorPageMessage(javax.servlet.http.HttpServletRequest request, java.io.Writer writer, int code, java.lang.String message, java.lang.String uri)
protected void	writeErrorPageStacks(javax.servlet.http.HttpServletRequest request, java.io.Writer writer)

Methods inherited from class org.eclipse.jetty.server.handler.AbstractHandler

destroy, doStart, doStop, dumpThis, getServer, setServer

Methods inherited from class org.eclipse.jetty.util.component.AbstractLifeCycle

addLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Methods inherited from class org.eclipse.jetty.util.component.ContainerLifeCycle

addBean, addBean, addBean, addEventListener, addManaged, contains, dump, dump, dump, dump, dump, dumpBeans, dumpObject, dumpStdErr, getBean, getBeans, getBeans, isManaged, manage, removeBean, removeBeans, removeEventListener, setBeans, setStopTimeout, start, stop, unmanage, updateBean, updateBean, updateBeans

Methods inherited from interface org.eclipse.jetty.util.component.LifeCycle

addLifeCycleListener, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, start, stop

Methods inherited from class java.lang.Object

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

Field Detail

ERROR_PAGE

public static final java.lang.String ERROR_PAGE

See Also:

Constant Field Values

Constructor Detail

ErrorHandler

public ErrorHandler()

Method Detail

handle

public void handle(java.lang.String target,
                   Request baseRequest,
                   javax.servlet.http.HttpServletRequest request,
                   javax.servlet.http.HttpServletResponse response)
            throws java.io.IOException

Description copied from interface: Handler

Handle a request.

Specified by:

handle in interface Handler

Specified by:

handle in class AbstractHandler

Parameters:

target - The target of the request - either a URI or a name.

baseRequest - The original unwrapped request object.

request - The request either as the Request object or a wrapper of that request. The HttpConnection.getCurrentConnection().getHttpChannel().getRequest() method can be used access the Request object if required.

response - The response as the Response object or a wrapper of that request. The HttpConnection.getCurrentConnection().getHttpChannel().getResponse() method can be used access the Response object if required.

Throws:

java.io.IOException - if unable to handle the request or response processing

doError

public void doError(java.lang.String target,
                    Request baseRequest,
                    javax.servlet.http.HttpServletRequest request,
                    javax.servlet.http.HttpServletResponse response)
             throws java.io.IOException

Description copied from class: AbstractHandler

Convenience method to generate error page.

This method can be called from AbstractHandler.handle(String, Request, HttpServletRequest, HttpServletResponse) when an DispatcherType.ERROR dispatch is detected and an error page needs to be generated by calling HttpServletResponse.sendError(int, String) with the appropriate code and reason, which are taken from ServletRequest.getAttribute(String) for RequestDispatcher.ERROR_STATUS_CODE and RequestDispatcher.ERROR_MESSAGE

Overrides:

doError in class AbstractHandler

Parameters:

target - The target of the request - either a URI or a name.

baseRequest - The original unwrapped request object.

request - The request either as the Request object or a wrapper of that request. The HttpConnection.getCurrentConnection().getHttpChannel().getRequest() method can be used access the Request object if required.

response - The response as the Response object or a wrapper of that request. The HttpConnection.getCurrentConnection().getHttpChannel().getResponse() method can be used access the Response object if required.

Throws:

java.io.IOException - if unable to handle the request or response processing

See Also:

for a conveniance class that calls this method.

generateAcceptableResponse

protected void generateAcceptableResponse(Request baseRequest,
                                          javax.servlet.http.HttpServletRequest request,
                                          javax.servlet.http.HttpServletResponse response,
                                          int code,
                                          java.lang.String message)
                                   throws java.io.IOException

Generate an acceptable error response.

This method is called to generate an Error page of a mime type that is acceptable to the user-agent. The Accept header is evaluated in quality order and the method generateAcceptableResponse(Request, HttpServletRequest, HttpServletResponse, int, String, String) is called for each mimetype until Request.isHandled() is true.

Parameters:

baseRequest - The base request

request - The servlet request (may be wrapped)

response - The response (may be wrapped)

Throws:

java.io.IOException - if the response cannot be generated

getAcceptableWriter

protected java.io.Writer getAcceptableWriter(Request baseRequest,
                                             javax.servlet.http.HttpServletRequest request,
                                             javax.servlet.http.HttpServletResponse response)
                                      throws java.io.IOException

Returns an acceptable writer for an error page.

Uses the user-agent's Accept-Charset to get response Writer. The acceptable charsets are tested in quality order if they are known to the JVM and the first known is set on ServletResponse.setCharacterEncoding(String) and the ServletResponse.getWriter() method used to return a writer. If there is no Accept-Charset header then ISO-8859-1 is used. If '*' is the highest quality known charset, then utf-8 is used.

Parameters:

baseRequest - The base request

request - The servlet request (may be wrapped)

response - The response (may be wrapped)

Returns:

A Writer if there is a known acceptable charset or null

Throws:

java.io.IOException - if a Writer cannot be returned

generateAcceptableResponse

protected void generateAcceptableResponse(Request baseRequest,
                                          javax.servlet.http.HttpServletRequest request,
                                          javax.servlet.http.HttpServletResponse response,
                                          int code,
                                          java.lang.String message,
                                          java.lang.String mimeType)
                                   throws java.io.IOException

Generate an acceptable error response for a mime type.

This method is called for each mime type in the users agent's Accept header, until Request.isHandled() is true and a response of the appropriate type is generated.

Parameters:

baseRequest - The base request

request - The servlet request (may be wrapped)

response - The response (may be wrapped)

mimeType - The mimetype to generate (may be */*or other wildcard)

Throws:

java.io.IOException - if a response cannot be generated

handleErrorPage

protected void handleErrorPage(javax.servlet.http.HttpServletRequest request,
                               java.io.Writer writer,
                               int code,
                               java.lang.String message)
                        throws java.io.IOException

Throws:

java.io.IOException

writeErrorPage

protected void writeErrorPage(javax.servlet.http.HttpServletRequest request,
                              java.io.Writer writer,
                              int code,
                              java.lang.String message,
                              boolean showStacks)
                       throws java.io.IOException

Throws:

java.io.IOException

writeErrorPageHead

protected void writeErrorPageHead(javax.servlet.http.HttpServletRequest request,
                                  java.io.Writer writer,
                                  int code,
                                  java.lang.String message)
                           throws java.io.IOException

Throws:

java.io.IOException

writeErrorPageBody

protected void writeErrorPageBody(javax.servlet.http.HttpServletRequest request,
                                  java.io.Writer writer,
                                  int code,
                                  java.lang.String message,
                                  boolean showStacks)
                           throws java.io.IOException

Throws:

java.io.IOException

writeErrorPageMessage

protected void writeErrorPageMessage(javax.servlet.http.HttpServletRequest request,
                                     java.io.Writer writer,
                                     int code,
                                     java.lang.String message,
                                     java.lang.String uri)
                              throws java.io.IOException

Throws:

java.io.IOException

writeErrorPageStacks

protected void writeErrorPageStacks(javax.servlet.http.HttpServletRequest request,
                                    java.io.Writer writer)
                             throws java.io.IOException

Throws:

java.io.IOException

badMessageError

public java.nio.ByteBuffer badMessageError(int status,
                                           java.lang.String reason,
                                           org.eclipse.jetty.http.HttpFields fields)

Bad Message Error body

Generate a error response body to be sent for a bad message. In this case there is something wrong with the request, so either a request cannot be built, or it is not safe to build a request. This method allows for a simple error page body to be returned and some response headers to be set.

Parameters:

status - The error code that will be sent

reason - The reason for the error code (may be null)

fields - The header fields that will be sent with the response.

Returns:

The content as a ByteBuffer, or null for no body.

getCacheControl

public java.lang.String getCacheControl()

Get the cacheControl.

Returns:

the cacheControl header to set on error responses.

setCacheControl

public void setCacheControl(java.lang.String cacheControl)

Set the cacheControl.

Parameters:

cacheControl - the cacheControl header to set on error responses.

isShowStacks

public boolean isShowStacks()

Returns:

True if stack traces are shown in the error pages

setShowStacks

public void setShowStacks(boolean showStacks)

Parameters:

showStacks - True if stack traces are shown in the error pages

setShowMessageInTitle

public void setShowMessageInTitle(boolean showMessageInTitle)

Parameters:

showMessageInTitle - if true, the error message appears in page title

getShowMessageInTitle

public boolean getShowMessageInTitle()

write

protected void write(java.io.Writer writer,
                     java.lang.String string)
              throws java.io.IOException

Throws:

java.io.IOException

getErrorHandler

public static ErrorHandler getErrorHandler(Server server,
                                           ContextHandler context)