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From conflue...@apache.org
Subject [CONF] Apache Camel: Error handling in Camel (page edited)
Date Tue, 14 Apr 2009 06:32:00 GMT
<html>
<head>
    <base href="http://cwiki.apache.org/confluence" />
    <style type="text/css">
    <!--
    body, p, td, table, tr, .bodytext, .stepfield {
	font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	color: #000000;
	font-weight: normal;
}
#PageContent {
	text-align: left;
	background-color: #fff;
	padding: 0px;
	margin: 0px;
    padding-bottom:20px;
}
/*
** when this stylesheet is used for the Tiny MCE Wysiwyg editor's edit area, we can't
** use an id=PageContent or class=wiki-content, so we must
** set the body style to that used for PageContent, and p to that used for wiki-content.
*/

body {
	margin: 0px;
	padding: 0px;
	text-align: center;
    background-color: #f0f0f0;
}

@media print {

body {
    background-color: #fff;
}

}

.monospaceInput {
    font:12px monospace
}

.wiki-content p, .commentblock p {
    margin: 16px 0px 16px 0px;
    padding: 0px;
}

.wiki-content-preview {
    padding: 5px;
    border-left: 1px solid #3c78b5;
    border-right: 1px solid #3c78b5;
}

ul, ol {
    margin-top: 2px;
    margin-bottom: 2px;
    padding-top: 0px;
    padding-bottom: 0px;
}

pre {
    padding: 0px;
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 5px;
    margin-right: 5px;
    text-align: left;
}

.helpheading {
    font-weight: bold;
    background-color: #D0D9BD;
        border-bottom: 1px solid #3c78b5;
        padding: 4px 4px 4px 4px;
        margin: 0px;
        margin-top: 10px;
}
.helpcontent {
        padding: 4px 4px 20px 4px;
    background-color: #f5f7f1;
}

.code {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.focusedComment {
    background: #ffffce;
}

.commentBox, .focusedComment {
    padding: 10px;
    margin: 5px 0 5px 0;
    border: 1px #bbb solid;
}

.codeHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.codeContent {
    text-align: left;
    background-color: #f0f0f0;
    padding: 3px;
}

.preformatted {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.preformattedHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.preformattedContent {
    background-color: #f0f0f0;
    padding: 3px;
}

.panel {
 	border: 1px dashed #3c78b5;
    margin: 10px;
    margin-top: 0px;
}

.panelHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.panelContent {
    background-color: #f0f0f0;
    padding: 5px;
}

.anonymousAlert {
    background-color: #f0f0f0;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}

.lockAlert {
    background-color: #f0f0f0;
    width: 50%;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}


.code-keyword {
  color: #000091;
  background-color: inherit;
}

.code-object {
  color: #910091;
  background-color: inherit;
}

.code-quote {
  color: #009100;
  background-color: inherit;
}

.code-comment {
  color: #808080;
  background-color: inherit;
}


.code-xml .code-keyword {
  color: inherit;
  font-weight: bold;
}

.code-tag {
  color: #000091;
  background-color: inherit;
}

.breadcrumbs {
    background-color: #f0f0f0;
 	border-color: #3c78b5;
	border-width: 1px 0px 1px 0px;
	border-style: solid;
    font-size: 11px;
    padding: 3px 0px 3px 0px;
}

.navmenu {
    border: 1px solid #ccc;
}

.menuheading {
    font-weight: bold;
    background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 2px 4px;
}

.menuitems {
	padding: 4px 4px 20px 4px;
}

.rightpanel {
    border-left: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

#helpheading {
    text-align: left;
    font-weight: bold;
    background-color: #D0D9BD;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 4px 4px;
	margin: 0px;
}
#helpcontent {
	padding: 4px 4px 4px 4px;
    background-color: #f5f7f1;
}
.helptab-unselected {
    font-weight: bold;
	padding: 5px;
    background-color: #f5f7f1;
}
.helptab-selected {
    font-weight: bold;
    background-color: #D0D9BD;
	padding: 5px;
}
.helptabs {
    margin: 0px;
    background-color: #f5f7f1;
	padding: 5px;
}
.infopanel-heading {
    font-weight: bold;
	padding: 4px 0px 2px 0px;
}

.pagebody {
}

.pageheader {
	padding: 5px 5px 5px 0px;
 	border-bottom: 1px solid #3c78b5;
}

.pagetitle {
	font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.newpagetitle {
    color: #ccc !important;
}

.steptitle {
	font-size: 18px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
	margin-bottom: 7px;
}

.substeptitle {
    font-size: 12px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
    margin: 2px 4px 4px 4px;
    padding: 2px 4px 1px 4px;
}

.stepdesc {
    font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	font-weight: normal;
    color: #666666;
    margin-top: 7px;
    margin-bottom: 7px;
}

.steplabel {
    font-weight: bold;
    margin-right: 4px;
    color: black;
    float: left;
    width: 15%;
    text-align: right;
}

.stepfield {
    background: #f0f0f0;
    padding: 5px;
}

.submitButtons{
    margin-top:5px;
    text-align:right;
}

.formtitle {
	font-size: 12px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.sectionbottom {
    border-bottom: 1px solid #3c78b5;
}

.topRow {
    border-top: 2px solid #3c78b5;
}

.tabletitle {
	font-size: 14px;
	font-weight: bold;
	font-family: Arial, sans-serif;
    padding: 3px 0px 2px 0px;
    margin: 8px 4px 2px 0px;
	color: #003366;
	border-bottom: 2px solid #3c78b5;
}
.pagesubheading {
    color: #666666;
    font-size: 10px;
    padding: 0px 0px 5px 0px;
}

HR {
	color: 3c78b5;
	height: 1;
}

A:link, A:visited, A:active, A:hover {
	color: #003366;
}

h1 A:link, h1 A:visited, h1 A:active {
	text-decoration: none;
}

h1 A:hover {
    border-bottom: 1px dotted #003366;
}

.wiki-content > :first-child, .commentblock > :first-child {
    margin-top: 3px;
}

.logocell {
    padding: 10px;
}

input {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #000000;
}

textarea, textarea.editor {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #333333;
}

/* use logoSpaceLink instead.
.spacenametitle {
	font: 21px/31px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle img {
  margin: 0 0 -4px 0;
}
.spacenametitle a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle a:visited {
    text-decoration: none;
    color: #999999;
}*/

.spacenametitle-printable {
	font: 20px/25px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle-printable a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle-printable a:visited {
    text-decoration: none;
    color: #999999;
}

.blogDate {
	font-weight: bold;
	text-decoration: none;
	color: black;
}

.blogSurtitle {
    background: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.blogHeading {
    font-size: 20px;
    line-height: normal;
    font-weight: bold;
    padding: 0px;
    margin: 0px;
}

.blogHeading a {
   text-decoration: none;
   color: black;
}

.endsection {
	align: right;
	color: #666666;
	margin-top: 10px;
}
.endsectionleftnav {
	align: right;
	color: #666666;
	margin-top: 10px;
}

h1 {
	font-size: 24px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	color: #003366;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 36px 0px 4px 0px;
}

h2 {
	font-size: 18px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 27px 0px 4px 0px;
}

h3 {
	font-size: 14px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 21px 0px 4px 0px;
}

h4 {
	font-size: 12px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 18px 0px 4px 0px;
}

h4.search {
	font-size: 12px;
	line-height: normal;
	font-weight: normal;
	background-color: #f0f0f0;
	padding: 4px;
	margin: 18px 0px 4px 0px;
}

h5 {
	font-size: 10px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

h6 {
	font-size: 8px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

.smallfont {
    font-size: 10px;
}
.descfont {
    font-size: 10px;
    color: #666666;
}
.smallerfont {
    font-size: 9px;
}
.smalltext {
    color: #666666;
    font-size: 10px;
}
.smalltext a {
    color: #666666;
}
.smalltext-blue {
    color: #3c78b5;
    font-size: 10px;
}
.surtitle {
    margin-left: 1px;
    margin-bottom: 5px;
    font-size: 14px;
    color: #666666;
}

/* css hack found here:  http://www.fo3nix.pwp.blueyonder.co.uk/tutorials/css/hacks/ */
.navItemOver { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #003366;
cursor: hand; voice-family: '\'}\''; voice-family:inherit; cursor: pointer;}
.navItemOver a { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItemOver a:visited { color: #ffffff; background-color:#003366; text-decoration: none;
}
.navItemOver a:hover { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItem { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #3c78b5;
}
.navItem a { color: #ffffff; text-decoration: none; }
.navItem a:hover { color: #ffffff; text-decoration: none; }
.navItem a:visited { color: #ffffff; text-decoration: none; }

div.padded { padding: 4px; }
div.thickPadded { padding: 10px; }
h3.macrolibrariestitle {
    margin: 0px 0px 0px 0px;
}

div.centered { text-align: center; margin: 10px; }
div.centered table {margin: 0px auto; text-align: left; }

.tableview table {
    margin: 0;
}

.tableview th {
    text-align: left;
    color: #003366;
    font-size: 12px;
    padding: 5px 0px 0px 5px;
    border-bottom: 2px solid #3c78b5;
}
.tableview td {
    text-align: left;
    border-color: #ccc;
    border-width: 0px 0px 1px 0px;
    border-style: solid;
    margin: 0;
    padding: 4px 10px 4px 5px;
}

.grid {
    margin: 2px 0px 5px 0px;
    border-collapse: collapse;
}
.grid th  {
    border: 1px solid #ccc;
    padding: 2px 4px 2px 4px;
    background: #f0f0f0;
    text-align: center;
}
.grid td  {
    border: 1px solid #ccc;
    padding: 3px 4px 3px 4px;
}
.gridHover {
	background-color: #f9f9f9;
}

td.infocell {
    background-color: #f0f0f0;
}
.label {
	font-weight: bold;
	color: #003366;
}

label {
	font-weight: bold;
	color: #003366;
}

.error {
	background-color: #fcc;
}

.errorBox {
	background-color: #fcc;
    border: 1px solid #c00;
    padding: 5px;
    margin: 5px;
}

.errorMessage {
	color: #c00;
}

.success {
	background-color: #dfd;
}

.successBox {
	background-color: #dfd;
    border: 1px solid #090;
    padding: 5px;
    margin-top:5px;
    margin-bottom:5px;
}

blockquote {
	padding-left: 10px;
	padding-right: 10px;
	margin-left: 5px;
	margin-right: 0px;
	border-left: 1px solid #3c78b5;
}

table.confluenceTable
{
    margin: 5px;
    border-collapse: collapse;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the
border: none attribute from the sectionMacro class */
table.confluenceTable th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

DIV.small {
	font-size: 9px;
}

H1.pagename {
	margin-top: 0px;
}

IMG.inline  {}

.loginform {
    margin: 5px;
    border: 1px solid #ccc;
}

/* The text how the "This is a preview" comment should be shown. */
.previewnote { text-align: center;
                font-size: 11px;
                    color: red; }

/* How the preview content should be shown */
.previewcontent { background: #E0E0E0; }

/* How the system messages should be shown (DisplayMessage.jsp) */
.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
.conflictnote { }

.createlink {
    color: maroon;
}
a.createlink {
    color: maroon;
}
.templateparameter {
    font-size: 9px;
    color: darkblue;
}

.diffadded {
    background: #ddffdd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkgreen;
}
.diffdeleted {
    color: #999;
    background: #ffdddd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkred;
}
.diffnochange {
    padding: 1px 1px 1px 4px;
	border-left: 4px solid lightgrey;
}
.differror {
    background: brown;
}
.diff {
    font-family: lucida console, courier new, fixed-width;
	font-size: 12px;
	line-height: 14px;
}
.diffaddedchars {
    background-color:#99ff99;
    font-weight:bolder;
}
.diffremovedchars {
    background-color:#ff9999;
    text-decoration: line-through;
    font-weight:bolder;
}

.greybackground {
    background: #f0f0f0
}

.greybox {
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.borderedGreyBox {
    border: 1px solid #cccccc;
    background-color: #f0f0f0;
    padding: 10px;
}

.greyboxfilled {
 	border: 1px solid #ddd;
    background: #f0f0f0;
    padding: 3px;
	margin: 1px 1px 10px 1px;
}

.navBackgroundBox {
    padding: 5px 5px 5px 5px;
    font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: white;
    background: #3c78b5;
    text-decoration: none;
}

.previewBoxTop {
	background-color: #f0f0f0;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 5px 0px 0px 0px;
    text-align: center;
}
.previewContent {
    background-color: #fff;
 	border-color: #3c78b5;
	border-width: 0px 1px 0px 1px;
	border-style: solid;
	padding: 10px;
	margin: 0px;
}
.previewBoxBottom {
	background-color: #f0f0f0;
    border-width: 0px 1px 1px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
 	border: 1px solid #3c78b5;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.functionbox-greyborder {
    background-color: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.search-highlight {
    background-color: #ffffcc;
}

/* normal (white) background */
.rowNormal {
    background-color: #ffffff;
 }

/* alternate (pale yellow) background */
.rowAlternate {
    background-color: #f7f7f7;
}

/* used in the list attachments table */
.rowAlternateNoBottomColor {
    background-color: #f7f7f7;
}

.rowAlternateNoBottomNoColor {
}

.rowAlternateNoBottomColor td {
    border-bottom: 0px;
}

.rowAlternateNoBottomNoColor td {
    border-bottom: 0px;
}

/* row highlight (grey) background */
.rowHighlight {
    background-color: #f0f0f0;

}

TD.greenbar {FONT-SIZE: 2px; BACKGROUND: #00df00; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}
TD.redbar {FONT-SIZE: 2px; BACKGROUND: #df0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.darkredbar {FONT-SIZE: 2px; BACKGROUND: #af0000; BORDER: 1px solid #9c9c9c; PADDING: 0px;
}

TR.testpassed {FONT-SIZE: 2px; BACKGROUND: #ddffdd; PADDING: 0px; }
TR.testfailed {FONT-SIZE: 2px; BACKGROUND: #ffdddd; PADDING: 0px; }

.toolbar  {
    margin: 0px;
    border-collapse: collapse;
}

.toolbar td  {
    border: 1px solid #ccc;
    padding: 2px 2px 2px 2px;
    color: #ccc;
}

td.noformatting {
    border-width: 0px;
    border-style: none;
    text-align: center;
	padding: 0px;
}

.commentblock {
    margin: 12px 0 12px 0;
}

/*
 * Divs displaying the license information, if necessary.
 */
.license-eval, .license-none, .license-nonprofit {
    border-top: 1px solid #bbbbbb;
    text-align: center;
    font-size: 10px;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

.license-eval, .license-none {
    background-color: #ffcccc;
}

.license-eval b, .license-none b {
    color: #990000
}

.license-nonprofit {
    background-color: #ffffff;
}

/*
 * The shadow at the bottom of the page between the main content and the
 * "powered by" section.
 */
.bottomshadow {
    height: 12px;
    background-image: url("$req.contextPath/images/border/border_bottom.gif");
    background-repeat: repeat-x;
}

/*
 * Styling of the operations box
 */
.navmenu .operations li, .navmenu .operations ul {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.navmenu .operations ul {
    margin-bottom: 9px;
}

.navmenu .label {
    font-weight: inherit;
}

/*
 * Styling of ops as a toolbar
 */
.toolbar div {
    display: none;
}

.toolbar .label {
    display: none;
}

.toolbar .operations {
    display: block;
}

.toolbar .operations ul {
    display: inline;
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}

.toolbar .operations li {
    list-style: none;
    display: inline;
}

/* list page navigational tabs */
#foldertab {
padding: 3px 0px 3px 8px;
margin-left: 0;
border-bottom: 1px solid #3c78b5;
font: bold 11px Verdana, sans-serif;
}

#foldertab li {
list-style: none;
margin: 0;
display: inline;
}

#foldertab li a {
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
text-decoration: none;
}

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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAMEL">CAMEL</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAMEL/Error+handling+in+Camel">Error
handling in Camel</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAMEL/Error+handling+in+Camel">Error
handling in Camel</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~davsclaus">Claus
Ibsen</a>
            <span class="smallfont">(Apr 13, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=106517&originalVersion=6&revisedVersion=7">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h2><a name="ErrorhandlinginCamel-ErrorhandlinginCamel"></a>Error
handling in Camel</h2>

<p>Error handling in Camel can roughly be separated into two distinct types:</p>
<ul class="alternate" type="square">
	<li>non transactional</li>
	<li>transactional</li>
</ul>


<p>Where non transactional is the most common type that is enabled out-of-the-box and
handled by Camel itself. The transaction type is handled by a backing system such as a J2EE
application server.</p>

<h3><a name="ErrorhandlinginCamel-Whendoesanerrorhappen"></a>When does an
error happen</h3>
<p>An error happens when</p>
<ul class="alternate" type="square">
	<li>any uncaught exception is thrown during routing and processing of messages within
Camel
<table cellpadding='5' width='85%' cellspacing='8px' class='tipMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/check.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>So think of this as a big exception interceptor that catches all exceptions and handles
what to do.</p></td></tr></table></li>
</ul>


<h3><a name="ErrorhandlinginCamel-Nontransactional"></a>Non transactional</h3>
<p>By default Camel uses the non transaction type and orchestrates the error handling
during processing and routing.</p>

<p>As there isn't a single error handling configuration that suites all uses cases,
you should consider altering the default configurations to better suit you needs.</p>

<h4><a name="ErrorhandlinginCamel-Camel1.xdefaulterrorhandler"></a>Camel
1.x default error handler</h4>
<p>In Camel 1.x a global <a href="/confluence/display/CAMEL/Dead+Letter+Channel"
title="Dead Letter Channel">Dead Letter Channel</a> is setup as the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> by default. It's configured as:</p>
<ul class="alternate" type="square">
	<li>redeliver up to 6 times</li>
	<li>pause 1 second between each redelivery attempt</li>
	<li>if all redelivery attempts failed then move exchange into the dead letter queue</li>
	<li>the default dead letter queue is a logger that logs the exchange at ERROR level
<img class="emoticon" src="/confluence/images/icons/emoticons/star_yellow.gif" height="16"
width="16" align="absmiddle" alt="" border="0"/></li>
</ul>


<table cellpadding='5' width='85%' cellspacing='8px' class='warningMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/forbidden.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Dead
Letter Queue <img class="emoticon" src="/confluence/images/icons/emoticons/star_yellow.gif"
height="16" width="16" align="absmiddle" alt="" border="0"/></b><br />
<p>A dead letter queue is like a black hole, it will consume the <a href="/confluence/display/CAMEL/Exchange"
title="Exchange">Exchange</a> and the <a href="/confluence/display/CAMEL/Exchange"
title="Exchange">Exchange</a> routing is ended with no indication that it failed.<br/>
This works great in the <a href="/confluence/display/CAMEL/JMS" title="JMS">JMS</a>
Messaging world where we don't want a bad message to cause endless retries and causing the
system to exhaust. The message is said to be poison and thus we want to move it to a dead
letter queue so the system can continue to operate and work with the next message.</p>

<p>This default does not go well with other transports using in a request/reply messaging
style. If the <a href="/confluence/display/CAMEL/Exchange" title="Exchange">Exchange</a>
failed then the original caller want to be alter it failed.</p>

<p>So the bottom line is that you <b>must</b> configure and setup the error
handling strategies that suits your business needs.</p></td></tr></table>

<h4><a name="ErrorhandlinginCamel-Camel2.0onwardsdefaulterrorhandler"></a>Camel
2.0 onwards default error handler</h4>
<p>In Camel 2.0 onwards a global <a href="/confluence/display/CAMEL/DefaultErrorHandler"
title="DefaultErrorHandler">DefaultErrorHandler</a> is setup as the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> by default. It's configured as:</p>
<ul class="alternate" type="square">
	<li>no redeliveries</li>
	<li>no deal letter queue</li>
	<li>if the exchange failed an exception is thrown and propagated back to the original
caller wrapped in a <tt>RuntimeCamelException</tt>.</li>
</ul>


<h3><a name="ErrorhandlinginCamel-Scopes"></a>Scopes</h3>
<p>Camel supports 2 scopes for the non transactional type:</p>
<ul class="alternate" type="square">
	<li>global</li>
	<li>per route</li>
</ul>


<p>And 3 scopes for transactional type:</p>
<ul class="alternate" type="square">
	<li>global</li>
	<li>per route</li>
	<li>per policy (spring transaction policy)</li>
</ul>


<h3><a name="ErrorhandlinginCamel-Howdoesitwork"></a>How does it work</h3>
<p>When Camel is started it will inspect the routes and weave in the error handling
into the routing. With up to 3 supported scopes, the error handling can be quite complex.
And on top of that you have inherited error handling and you can even configure <a href="/confluence/display/CAMEL/Exception+Clause"
title="Exception Clause">Exception Clause</a>s to handle specific exception types
differently. So yes it's advanced but very powerful when you get the grip of it.</p>

<p>To keep things simple we first look at the basic concept how Camel orchestrates the
redelivery attempt. At any given node in the route graph Camel intercepts the current Exchange
being routed and wraps it with the <a href="/confluence/display/CAMEL/Error+Handler" title="Error
Handler">Error Handler</a>. This ensures that the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> can kick in, just as the AOP around concept.
If the exchange can be routed without any problems then it's forwarded to the next node in
the route graph, <b>But</b> if there was an exception thrown, then the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> kicks in and decides what to do. </p>

<p>An example illustrating this:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">from(<span class="code-quote">"seda:newOrder"</span>)
   .to(<span class="code-quote">"bean:validateOrder"</span>)
   .to(<span class="code-quote">"bean:storeOrder"</span>)
   .to(<span class="code-quote">"bean:confirmOrder"</span>);</pre>
</div></div>

<p>In this route we have 3 nodes (the dots) where the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> is watching us (The AOP around stuff). So
when an order arrives on the seda queue we consume it and send it to the validateOrder bean.
In case the validation bean processed ok, we move on to the next node. In case the storeOrder
bean failed and throws an exception it's caught by the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> that  decides what to do next. Either it
does a:</p>
<ul class="alternate" type="square">
	<li>redeliver</li>
	<li>or move it to dead letter queue</li>
</ul>


<p>It will continue to do redeliveries based on the policy configured. By default Camel
will attempt at most 6 redeliveries with 1 second delay. So if the storeOrder bean did succeed
at the 3rd attempt the routing will continue to the next node the confirmOrder bean. In case
all redeliveries failed the Exchange is regarded as failed and is moved to the dead letter
queue and the processing of this exchange stops. By default the dead letter queue is just
a ERROR logger.</p>

<table cellpadding='5' width='85%' cellspacing='8px' class='infoMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/information.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>This applies to all kind of <a href="/confluence/display/CAMEL/Components" title="Components">Components</a>
in Camel. The sample above only uses <a href="/confluence/display/CAMEL/Bean" title="Bean">Bean</a>
but it's the same for <a href="/confluence/display/CAMEL/File" title="File">File</a>,
<a href="/confluence/display/CAMEL/Mail" title="Mail">Mail</a>, <a href="/confluence/display/CAMEL/Velocity"
title="Velocity">Velocity</a> or whatever component you use.</p></td></tr></table>

<h3><a name="ErrorhandlinginCamel-Transactional"></a>Transactional</h3>
<p>Camel leverages Spring transactions. Usually you can only use this with a limited
number of transport types such as JMS or JDBC based, that yet again requires a transaction
manager such as a Spring transaction, a J2EE server or a Message Broker.</p>

<h4><a name="ErrorhandlinginCamel-Howdoesitwork"></a>How does it work</h4>
<p>Camel does the same weaving as for the non-transactional type. The difference is
that for transactional exchanges the <a href="/confluence/display/CAMEL/Error+Handler"
title="Error Handler">Error Handler</a> does <b>not</b> kick in. You
can say the AOP around does not apply. Camel relies solely on the backing system to orchestrate
the error handling. And as such the when the backing system does redeliver it will start all
over again. For instance if the exchange was started by a JMS consumer then it's started again
as the JMS message is rolled back on the JMS queue and Camel will re consume the JMS message
again.</p>

<p>See <a href="/confluence/display/CAMEL/Transactional+Client" title="Transactional
Client">Transactional Client</a> for more.</p>


<h2><a name="ErrorhandlinginCamel-Seealso"></a>See also</h2>
<ul class="alternate" type="square">
	<li><a href="/confluence/display/CAMEL/Error+Handler" title="Error Handler">Error
Handler</a></li>
	<li><a href="/confluence/display/CAMEL/Dead+Letter+Channel" title="Dead Letter Channel">Dead
Letter Channel</a></li>
	<li><a href="/confluence/display/CAMEL/Exception+Clause" title="Exception Clause">Exception
Clause</a> <b>onException</b></li>
	<li><a href="/confluence/display/CAMEL/Transactional+Client" title="Transactional
Client">Transactional Client</a></li>
</ul>
</div>


</td></tr></table></div>
<p>
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