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From build...@apache.org
Subject svn commit: r817970 - in /websites/production/camel/content: cache/main.pageCache why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
Date Wed, 16 May 2012 22:18:07 GMT
Author: buildbot
Date: Wed May 16 22:18:07 2012
New Revision: 817970

Log:
Production update by buildbot for camel

Added:
    websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
Modified:
    websites/production/camel/content/cache/main.pageCache

Modified: websites/production/camel/content/cache/main.pageCache
==============================================================================
Binary files - no diff available.

Added: websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
==============================================================================
--- websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
(added)
+++ websites/production/camel/content/why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html
Wed May 16 22:18:07 2012
@@ -0,0 +1,189 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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+    <!--[if IE]>
+    <style type="text/css">
+      .maincontent { width:100%; }
+    </style>
+    <![endif]-->
+
+    <title>
+    Apache Camel: Why does my file consumer not pick up the file, and how do I let the file
consumer use the Camel error handler?
+    </title>
+</head>
+<body>
+<div class="white_box">
+<div class="header">
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margin-top:20px; margin-left:18px;" href="http://camel.apache.org/">Camel</a>
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href="faq.html">FAQ</a>&nbsp;&gt;&nbsp;<a href="using-camel-questions.html">Using
Camel Questions</a>&nbsp;&gt;&nbsp;<a href="why-does-my-file-consumer-not-pick-up-the-file-and-how-do-i-let-the-file-consumer-use-the-camel-error-handler.html">Why
does my file consumer not pick up the file, and how do I let the file consumer use the Camel
error handler?</a>
+          </div>
+          <!-- Quicklinks -->
+<div id="site-quicklinks"><p><a shape="rect" href="download.html" title="Download">Download</a>
| <a shape="rect" href="javadoc.html" title="JavaDoc">JavaDoc</a> | <a shape="rect"
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+        <td valign="top" width="100%">
+<div class="wiki-content maincontent"><h2><a shape="rect" name="Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F-Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F"></a>Why
does my file consumer not pick up the file, and how do I let the file consumer use the Camel
error handler?</h2>
+
+<p>There could be several reasons why the <a shape="rect" href="file2.html" title="File2">File</a>
consumer is not picking up files. For example it may not run at all, or it cannot acquire
a read lock on the file.<br clear="none">
+<a shape="rect" href="logging-questions.html" title="Logging Questions">Check the logs</a>
for any exceptions or other informative messages. You can <a shape="rect" href="how-do-i-enable-debug-logging.html"
title="How do I enable debug logging">turn on DEBUG logging</a> at <tt>org.apache.camel.component.file</tt>
to see more detail.</p>
+
+<h3><a shape="rect" name="Whydoesmyfileconsumernotpickupthefile%2CandhowdoIletthefileconsumerusetheCamelerrorhandler%3F-HowtouseCamel%27sroutingerrorhandlerswiththefileconsumer"></a>How
to use Camel's routing error handlers with the file consumer</h3>
+
+<p>Well, this is really a "<a shape="rect" class="external-link" href="http://en.wikipedia.org/wiki/Chicken_or_the_egg"
rel="nofollow">chicken or the egg</a>" question. The Camel <a shape="rect" href="error-handling-in-camel.html"
title="Error handling in Camel">error handler</a> (e.g., in the routes) only applies
when a message is being routed by the routing engine. <br clear="none">
+Before this happens, a consumer must successfully receive a message, create a Camel <a
shape="rect" href="exchange.html" title="Exchange">Exchange</a>, populate the <a
shape="rect" href="exchange.html" title="Exchange">Exchange</a> with message details
(e.g., body and headers), and then pass the <a shape="rect" href="exchange.html" title="Exchange">Exchange</a>
to the routing engine. Only at this point can the routing error handler deal with exceptions
occurring. Before this point, any error handling is really <a shape="rect" href="component.html"
title="Component">Component</a>-specific.</p>
+
+<div class="panelMacro"><table class="infoMacro"><colgroup span="1"><col
span="1" width="24"><col span="1"></colgroup><tr><td colspan="1" rowspan="1"
valign="top"><img align="middle" src="https://cwiki.apache.org/confluence/images/icons/emoticons/information.gif"
width="16" height="16" alt="" border="0"></td><td colspan="1" rowspan="1"><b>Bridge
with error handler</b><br clear="none">From Camel 2.10 onwards the file and ftp
consumers can now bridge to the Camel routing engine's error handler. See more details at
the <tt>consumer.bridgeErrorHandler</tt> option on the <a shape="rect" href="file2.html"
title="File2">File</a> documentation.</td></tr></table></div>
+
+<p>If the component consumer extends the <a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/impl/DefaultConsumer.java?view=markup"><tt>DefaultConsumer</tt></a>
from Camel, then it offers an <a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/spi/ExceptionHandler.java?view=markup"><tt>org.apache.camel.spi.ExceptionHandler</tt></a>
hook for end users to plug-in a custom strategy. The default implementation from Camel is
<a shape="rect" class="external-link" href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/main/java/org/apache/camel/impl/LoggingExceptionHandler.java?view=markup"><tt>LoggingExceptionHandler</tt></a>
that will log the exception at <tt>ERROR</tt>/<tt>WARN</tt> level,
and then ignore the exception.</p>
+
+<p>See the <a shape="rect" href="file2.html" title="File2">File</a> page
in the bottom for an example how to use a custom <tt>ExceptionHandler</tt> that
sends a new message to the Camel routing engine, which then allows the routing engine to trigger
its own error handling to deal with the exception.</p></div>
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