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| <div class="subTitle">javax.faces.context</div> |
| <h2 title="Class ExceptionHandler" class="title">Class ExceptionHandler</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>javax.faces.context.ExceptionHandler</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.util.EventListener, <a href="../../../javax/faces/event/FacesListener.html" title="interface in javax.faces.event">FacesListener</a>, <a href="../../../javax/faces/event/SystemEventListener.html" title="interface in javax.faces.event">SystemEventListener</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../javax/faces/context/ExceptionHandlerWrapper.html" title="class in javax.faces.context">ExceptionHandlerWrapper</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public abstract class <span class="typeNameLabel">ExceptionHandler</span> |
| extends java.lang.Object |
| implements <a href="../../../javax/faces/event/SystemEventListener.html" title="interface in javax.faces.event">SystemEventListener</a></pre> |
| <div class="block"><p class="changed_added_2_0"><strong |
| class="changed_modified_2_3">ExceptionHandler</strong> is the central |
| point for handling <em>unexpected</em> <code>Exception</code>s that |
| are thrown during the Faces lifecycle. The |
| <code>ExceptionHandler</code> must not be notified of any |
| <code>Exception</code>s that occur during application startup or |
| shutdown.</p> |
| |
| <div class="changed_added_2_0"> |
| |
| <p>See the specification prose document for the requirements for the |
| default implementation. <code>Exception</code>s may be passed to the |
| <code>ExceptionHandler</code> in one of two ways:</p> |
| |
| <ul> |
| |
| <li><p>by ensuring that <code>Exception</code>s are not caught, or |
| are caught and re-thrown.</p> |
| |
| <p>This approach allows the <code>ExceptionHandler</code> |
| facility specified in section JSF.6.2 to operate on the |
| <code>Exception</code>.</p> |
| |
| </li> |
| |
| <li><p>By using the system event facility to publish an <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event"><code>ExceptionQueuedEvent</code></a> that wraps the <code>Exception</code>.</p> |
| |
| <p>This approach requires manually publishing the <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event"><code>ExceptionQueuedEvent</code></a>, but allows more information about the |
| <code>Exception</code>to be stored in the event. The |
| following code is an example of how to do this.</p> |
| |
| <pre><code> |
| |
| //... |
| } catch (Exception e) { |
| FacesContext ctx = FacesContext.getCurrentInstance(); |
| ExceptionQueuedEventContext eventContext = new ExceptionQueuedEventContext(ctx, e); |
| eventContext.getAttributes().put("key", "value"); |
| ctx.getApplication().publishEvent(ExceptionQueuedEvent.class, eventContext); |
| } |
| |
| </code></pre> |
| |
| <p>Because the <code>Exception</code> must not be re-thrown |
| when using this approach, lifecycle processing may continue |
| as normal, allowing more <code>Exception</code>s to be |
| published if necessary.</p> |
| |
| </li> |
| </ul> |
| |
| <p>With either approach, any <code>ExceptionQueuedEvent</code> instances |
| that are published in this way are accessible to the <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> |
| method, which is called at the end of each lifecycle phase, as |
| specified in section JSF.6.2.</p> |
| |
| <p class="changed_added_2_3">Note that if <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> happens to |
| be invoked during <a href="../../../javax/faces/event/PhaseId.html#RENDER_RESPONSE"><code>PhaseId.RENDER_RESPONSE</code></a>, |
| the recovery options are more limited than when it is invoked during |
| other phases. Specifically, it is not valid to call <a href="../../../javax/faces/application/NavigationHandler.html#handleNavigation-javax.faces.context.FacesContext-java.lang.String-java.lang.String-"><code>NavigationHandler.handleNavigation(javax.faces.context.FacesContext, java.lang.String, java.lang.String)</code></a> during |
| <code>RENDER_RESPONSE</code>.</p> |
| |
| <p>Instances of this class are request scoped and are created by |
| virtue of <a href="../../../javax/faces/context/FacesContextFactory.html#getFacesContext-java.lang.Object-java.lang.Object-java.lang.Object-javax.faces.lifecycle.Lifecycle-"><code>FacesContextFactory.getFacesContext(java.lang.Object, java.lang.Object, java.lang.Object, javax.faces.lifecycle.Lifecycle)</code></a> calling <a href="../../../javax/faces/context/ExceptionHandlerFactory.html#getExceptionHandler--"><code>ExceptionHandlerFactory.getExceptionHandler()</code></a>.</p> |
| |
| </div></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#ExceptionHandler--">ExceptionHandler</a></span>()</code> </td> |
| </tr> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#getHandledExceptionQueuedEvent--">getHandledExceptionQueuedEvent</a></span>()</code> |
| <div class="block"><p class="changed_added_2_0">Return the first |
| <code>ExceptionQueuedEvent</code> handled by this handler.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract java.lang.Iterable<<a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#getHandledExceptionQueuedEvents--">getHandledExceptionQueuedEvents</a></span>()</code> |
| <div class="block"><p class="changed_added_2_0">The default implementation must |
| return an <code>Iterable</code> over all |
| <code>ExceptionQueuedEvent</code>s that have been handled by the <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> method.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>abstract java.lang.Throwable</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#getRootCause-java.lang.Throwable-">getRootCause</a></span>(java.lang.Throwable t)</code> |
| <div class="block"><p class="changed_added_2_0">Unwrap the argument <code>t</code> |
| until the unwrapping encounters an Object whose |
| <code>getClass()</code> is not equal to |
| <code>FacesException.class</code> or |
| <code>javax.el.ELException.class</code>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>abstract java.lang.Iterable<<a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#getUnhandledExceptionQueuedEvents--">getUnhandledExceptionQueuedEvents</a></span>()</code> |
| <div class="block"><p class="changed_added_2_0">Return an <code>Iterable</code> over |
| all <code>ExceptionQueuedEvent</code>s that have not yet been handled |
| by the <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> method.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>abstract void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#handle--">handle</a></span>()</code> |
| <div class="block"><p class="changed_added_2_0">Take action to handle the |
| <code>Exception</code> instances residing inside the <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event"><code>ExceptionQueuedEvent</code></a> instances that have been queued by calls to |
| <code>Application().publishEvent(ExceptionQueuedEvent.class, |
| <em>eventContext</em>)</code>.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>abstract boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#isListenerForSource-java.lang.Object-">isListenerForSource</a></span>(java.lang.Object source)</code> |
| <div class="block">This method must return <code>true</code> if and only if this |
| listener instance is interested in receiving events from the |
| instance referenced by the <code>source</code> parameter.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>abstract void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/faces/context/ExceptionHandler.html#processEvent-javax.faces.event.SystemEvent-">processEvent</a></span>(<a href="../../../javax/faces/event/SystemEvent.html" title="class in javax.faces.event">SystemEvent</a> exceptionQueuedEvent)</code> |
| <div class="block">When called, the listener can assume that any guarantees given |
| in the javadoc for the specific <a href="../../../javax/faces/event/SystemEvent.html" title="class in javax.faces.event"><code>SystemEvent</code></a> |
| subclass are true.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ExceptionHandler--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ExceptionHandler</h4> |
| <pre>public ExceptionHandler()</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
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| <h3>Method Detail</h3> |
| <a name="handle--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>handle</h4> |
| <pre>public abstract void handle() |
| throws <a href="../../../javax/faces/FacesException.html" title="class in javax.faces">FacesException</a></pre> |
| <div class="block"><p class="changed_added_2_0">Take action to handle the |
| <code>Exception</code> instances residing inside the <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event"><code>ExceptionQueuedEvent</code></a> instances that have been queued by calls to |
| <code>Application().publishEvent(ExceptionQueuedEvent.class, |
| <em>eventContext</em>)</code>. The requirements of the default |
| implementation are detailed in section JSF.6.2.1.</p></div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../javax/faces/FacesException.html" title="class in javax.faces">FacesException</a></code> - if and only if a problem occurs while |
| performing the algorithm to handle the <code>Exception</code>, not |
| as a means of conveying a handled <code>Exception</code> itself.</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getHandledExceptionQueuedEvent--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getHandledExceptionQueuedEvent</h4> |
| <pre>public abstract <a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a> getHandledExceptionQueuedEvent()</pre> |
| <div class="block"><p class="changed_added_2_0">Return the first |
| <code>ExceptionQueuedEvent</code> handled by this handler.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>instance of <code>ExceptionQueuedEvent</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getUnhandledExceptionQueuedEvents--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getUnhandledExceptionQueuedEvents</h4> |
| <pre>public abstract java.lang.Iterable<<a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a>> getUnhandledExceptionQueuedEvents()</pre> |
| <div class="block"><p class="changed_added_2_0">Return an <code>Iterable</code> over |
| all <code>ExceptionQueuedEvent</code>s that have not yet been handled |
| by the <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> method.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the unhandled set of <code>ExceptionQueuedEvent</code>s.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getHandledExceptionQueuedEvents--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getHandledExceptionQueuedEvents</h4> |
| <pre>public abstract java.lang.Iterable<<a href="../../../javax/faces/event/ExceptionQueuedEvent.html" title="class in javax.faces.event">ExceptionQueuedEvent</a>> getHandledExceptionQueuedEvents()</pre> |
| <div class="block"><p class="changed_added_2_0">The default implementation must |
| return an <code>Iterable</code> over all |
| <code>ExceptionQueuedEvent</code>s that have been handled by the <a href="../../../javax/faces/context/ExceptionHandler.html#handle--"><code>handle()</code></a> method.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an <code>Iterable</code> over all <code>ExceptionQueuedEvent</code>s.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="processEvent-javax.faces.event.SystemEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>processEvent</h4> |
| <pre>public abstract void processEvent(<a href="../../../javax/faces/event/SystemEvent.html" title="class in javax.faces.event">SystemEvent</a> exceptionQueuedEvent) |
| throws <a href="../../../javax/faces/event/AbortProcessingException.html" title="class in javax.faces.event">AbortProcessingException</a></pre> |
| <div class="block"><p>When called, the listener can assume that any guarantees given |
| in the javadoc for the specific <a href="../../../javax/faces/event/SystemEvent.html" title="class in javax.faces.event"><code>SystemEvent</code></a> |
| subclass are true.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../javax/faces/event/SystemEventListener.html#processEvent-javax.faces.event.SystemEvent-">processEvent</a></code> in interface <code><a href="../../../javax/faces/event/SystemEventListener.html" title="interface in javax.faces.event">SystemEventListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>exceptionQueuedEvent</code> - the <code>SystemEvent</code> instance that |
| is being processed.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../javax/faces/event/AbortProcessingException.html" title="class in javax.faces.event">AbortProcessingException</a></code> - if lifecycle processing should |
| cease for this request.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isListenerForSource-java.lang.Object-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isListenerForSource</h4> |
| <pre>public abstract boolean isListenerForSource(java.lang.Object source)</pre> |
| <div class="block"><p>This method must return <code>true</code> if and only if this |
| listener instance is interested in receiving events from the |
| instance referenced by the <code>source</code> parameter.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../javax/faces/event/SystemEventListener.html#isListenerForSource-java.lang.Object-">isListenerForSource</a></code> in interface <code><a href="../../../javax/faces/event/SystemEventListener.html" title="interface in javax.faces.event">SystemEventListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - the source that is inquiring about the |
| appropriateness of sending an event to this listener instance.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the value as specified above</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getRootCause-java.lang.Throwable-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getRootCause</h4> |
| <pre>public abstract java.lang.Throwable getRootCause(java.lang.Throwable t)</pre> |
| <div class="block"><p class="changed_added_2_0">Unwrap the argument <code>t</code> |
| until the unwrapping encounters an Object whose |
| <code>getClass()</code> is not equal to |
| <code>FacesException.class</code> or |
| <code>javax.el.ELException.class</code>. If there is no root cause, <code>null</code> is returned.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - passed-in wrapped <code>Throwable</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>unwrapped object.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.NullPointerException</code> - if argument <code>t</code> is |
| <code>null</code>.</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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