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From conflue...@apache.org
Subject [CONF] Apache Camel: Exception Clause (page edited)
Date Wed, 26 Nov 2008 10:45:00 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 {
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}

}

.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;
}

#foldertab li a:link { color: #ffffff; }
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/* alert panel */
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/* side menu highlighting (e.g. space content screen) */
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{
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.topBar {
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{
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div.auto_complete ul {
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div.auto_complete ul strong.highlight {
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/******* Edit Page Styles *******/
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}

.toogleInfoDiv{
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.inputSection{
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}

#editBox{
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/******* Left Navigation Theme Styles ********/
.leftnav li a {
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    margin:0px;
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}

.leftnav li a:active {color:white;}
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.leftnav li a:hover {background-color: #003366; color:white;}

/* Added by Shaun during i18n */
.replaced
{
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}

.topPadding
{
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}

/* new form style */
.form-block {
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.form-error-block {
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}
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    -->
    </style>
</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/Exception+Clause">Exception Clause</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAMEL/Exception+Clause">Exception Clause</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~davsclaus">Claus Ibsen</a>
            <span class="smallfont">(Nov 26, 2008)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>Handling and sending a fixed response back to the client</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=63781&originalVersion=12&revisedVersion=13">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h2><a name="ExceptionClause-ExceptionClause"></a>Exception Clause</h2>

<p>You can use the <em>Exception Clause</em> in the Java <a href="/confluence/display/CAMEL/DSL" title="DSL">DSL</a> to specify the error handling you require on a per type basis using the <b>exception()</b> method.</p>

<p>For example if you want to perform a specific piece of processing if a certain exception is raised you can do this simply via</p>

<div class="code"><div class="codeContent">
<pre class="code-java">exception(ValidationException.class).
  to(<span class="code-quote">"activemq:validationFailed"</span>);
  
from(<span class="code-quote">"seda:inputA"</span>).
  to(<span class="code-quote">"validation:foo/bar.xsd"</span>, <span class="code-quote">"activemq:someQueue"</span>);

from(<span class="code-quote">"seda:inputB"</span>).to(<span class="code-quote">"direct:foo"</span>).
  to(<span class="code-quote">"rnc:mySchema.rnc"</span>, <span class="code-quote">"activemq:anotherQueue"</span>);</pre>
</div></div>

<p>Here if the processing of <b>seda:inputA</b> or <b>seda:inputB</b> cause a ValidationException to be thrown (such as due to the XSD validation of the <a href="/confluence/display/CAMEL/Validation" title="Validation">Validation</a> component or the Relax NG Compact syntax validation of the <a href="/confluence/display/CAMEL/Jing" title="Jing">Jing</a> component), then the message will be sent to <b>activemq:validationFailed</b> queue.</p>

<h3><a name="ExceptionClause-ChangesinCamel1.5"></a>Changes in Camel 1.5</h3>
<p>In Camel 1.5 the <b>exception</b> clauses has been renamed to <b>onException</b> and it also supports multiple exception classes:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">onException(MyBusinessException.class, MyOtherBusinessException.class).
  to(<span class="code-quote">"activemq:businessFailed"</span>);</pre>
</div></div>

<p>But the most important new feature is support for marking exceptions as being handled.</p>

<h3><a name="ExceptionClause-Markingexceptionsasbeinghandled"></a>Marking exceptions as being handled</h3>

<p><b>Available as of Camel 1.5</b></p>

<p>Using <b>onException</b> to handle known exceptions is a very powerful feature in Camel. However prior to Camel 1.5 you could not mark the exception as being handled, so the caller would still receive the caused exception as a response. In Camel 1.5 you can now change this behavior with the new <b>handle</b> DSL. The handle is a <a href="/confluence/display/CAMEL/Predicate" title="Predicate">Predicate</a> that is overloaded to accept three types of parameters:</p>
<ul class="alternate" type="square">
	<li>Boolean</li>
	<li><a href="/confluence/display/CAMEL/Predicate" title="Predicate">Predicate</a></li>
	<li><a href="/confluence/display/CAMEL/Expression" title="Expression">Expression</a> that will be evaluates as a <a href="/confluence/display/CAMEL/Predicate" title="Predicate">Predicate</a> using this rule set: If the expressions returns a Boolean its used directly. For any other response its regarded as <tt>true</tt> if the response is <tt>not null</tt>.</li>
</ul>


<p>For instance to mark all <tt>ValidationException</tt> as being handled we can do this:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">onException(ValidationException).handled(<span class="code-keyword">true</span>);</pre>
</div></div>

<h4><a name="ExceptionClause-Exampleusinghandled"></a>Example using handled</h4>
<p>In this route below we want to do special handling of all OrderFailedException as we want to return a customized response to the caller. First we setup our routing as:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-comment">// we <span class="code-keyword">do</span> special error handling <span class="code-keyword">for</span> when OrderFailedException is thrown
</span>onException(OrderFailedException.class)
    <span class="code-comment">// we mark the exchange as handled so the caller doesn't receive the
</span>    <span class="code-comment">// OrderFailedException but whatever we want to <span class="code-keyword">return</span> instead
</span>    .handled(<span class="code-keyword">true</span>)
    <span class="code-comment">// <span class="code-keyword">this</span> bean handles the error handling where we can customize the error
</span>    <span class="code-comment">// response using java code
</span>    .bean(OrderService.class, <span class="code-quote">"orderFailed"</span>)
    <span class="code-comment">// and since <span class="code-keyword">this</span> is an unit test we use mocks <span class="code-keyword">for</span> testing
</span>    .to(<span class="code-quote">"mock:error"</span>);

<span class="code-comment">// <span class="code-keyword">this</span> is just the <span class="code-keyword">generic</span> error handler where we set the destination
</span><span class="code-comment">// and the number of redeliveries we want to <span class="code-keyword">try</span>
</span>errorHandler(deadLetterChannel(<span class="code-quote">"mock:error"</span>).maximumRedeliveries(1));

<span class="code-comment">// <span class="code-keyword">this</span> is our route where we handle orders
</span>from(<span class="code-quote">"direct:start"</span>)
    <span class="code-comment">// <span class="code-keyword">this</span> bean is our order service
</span>    .bean(OrderService.class, <span class="code-quote">"handleOrder"</span>)
    <span class="code-comment">// <span class="code-keyword">this</span> is the destination <span class="code-keyword">if</span> the order is OK
</span>    .to(<span class="code-quote">"mock:result"</span>);</pre>
</div></div>
<p>Then we have our service beans that is just plain POJO demonstrating how you can use <a href="/confluence/display/CAMEL/Bean+Integration" title="Bean Integration">Bean Integration</a> in Camel to avoid being tied to the Camel API:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">/**
 * Order service as a plain POJO class
 */
<span class="code-keyword">public</span> <span class="code-keyword">static</span> class OrderService {

    /**
     * This method handle our order input and <span class="code-keyword">return</span> the order
     *
     * @param in      the in headers
     * @param payload the in payload
     * @param out     the out headers
     * @<span class="code-keyword">return</span> the out payload
     * @<span class="code-keyword">throws</span> OrderFailedException is thrown <span class="code-keyword">if</span> the order can not be processed
     */
    <span class="code-keyword">public</span> <span class="code-object">Object</span> handleOrder(@Headers Map in, @Body <span class="code-object">String</span> payload, @OutHeaders Map out)
        <span class="code-keyword">throws</span> OrderFailedException {
        out.put(<span class="code-quote">"customerid"</span>, in.get(<span class="code-quote">"customerid"</span>));
        <span class="code-keyword">if</span> (<span class="code-quote">"Order: kaboom"</span>.equals(payload)) {
            <span class="code-keyword">throw</span> <span class="code-keyword">new</span> OrderFailedException(<span class="code-quote">"Can not order: kaboom"</span>);
        } <span class="code-keyword">else</span> {
            out.put(<span class="code-quote">"orderid"</span>, <span class="code-quote">"123"</span>);
            <span class="code-keyword">return</span> <span class="code-quote">"Order OK"</span>;
        }
    }

    /**
     * This method creates the response to the caller <span class="code-keyword">if</span> the order could not be processed
     * @param in      the in headers
     * @param payload the in payload
     * @param out     the out headers
     * @<span class="code-keyword">return</span> the out payload
     */
    <span class="code-keyword">public</span> <span class="code-object">Object</span> orderFailed(@Headers Map in, @Body <span class="code-object">String</span> payload, @OutHeaders Map out) {
        out.put(<span class="code-quote">"customerid"</span>, in.get(<span class="code-quote">"customerid"</span>));
        out.put(<span class="code-quote">"orderid"</span>, <span class="code-quote">"failed"</span>);
        <span class="code-keyword">return</span> <span class="code-quote">"Order ERROR"</span>;
    }
}</pre>
</div></div>
<p>And finally the exception that is being thrown is just a regular exception:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">/**
 * Exception thrown <span class="code-keyword">if</span> the order can not be processed
 */
<span class="code-keyword">public</span> <span class="code-keyword">static</span> class OrderFailedException <span class="code-keyword">extends</span> Exception {

    <span class="code-keyword">public</span> OrderFailedException(<span class="code-object">String</span> message) {
        <span class="code-keyword">super</span>(message);
    }
    
}</pre>
</div></div>

<p>So what happens?</p>

<p>If we sent an order that is being processed OK then the caller will receive an Exchange as reply containing <tt>Order OK</tt> as the payload and <tt>orderid=123</tt> in a header.</p>

<p>If the order could <b>not</b> be processed and thus an OrderFailedException was thrown the caller will <b>not</b> receive this exception (as opposed to in Camel 1.4, where the caller received the OrderFailedException) but our customized response that we have fabricated in the <tt>orderFailed</tt> method in our <tt>OrderService</tt>. So the caller receives an Exchange with the payload <tt>Order ERROR</tt> and a <tt>orderid=failed</tt> in a header.</p>

<h4><a name="ExceptionClause-UsinghandledwithSpringDSL"></a>Using handled with Spring DSL</h4>
<p>The same route as above in Spring DSL:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag"><span class="code-comment">&lt;!-- this is our POJO bean with our business logic defined as a plain spring bean --&gt;</span></span>
<span class="code-tag">&lt;bean id=<span class="code-quote">"orderService"</span> class=<span class="code-quote">"org.apache.camel.spring.processor.onexception.OrderService"</span>/&gt;</span>

<span class="code-tag"><span class="code-comment">&lt;!-- this is the camel context where we define the routes --&gt;</span></span>
<span class="code-tag">&lt;camelContext xmlns=<span class="code-quote">"http://activemq.apache.org/camel/schema/spring"</span>&gt;</span>

    <span class="code-tag">&lt;route&gt;</span>
        <span class="code-tag"><span class="code-comment">&lt;!-- the route --&gt;</span></span>
        <span class="code-tag">&lt;from uri=<span class="code-quote">"direct:start"</span>/&gt;</span>

        <span class="code-tag"><span class="code-comment">&lt;!-- we must configure the on exception within the route, as opposed to Java DSL where we can do this outside --&gt;</span></span>
        <span class="code-tag">&lt;onException&gt;</span>
            <span class="code-tag"><span class="code-comment">&lt;!-- the exception is full qualified names as plain strings --&gt;</span></span>
            <span class="code-tag"><span class="code-comment">&lt;!-- there can be more just add a 2nd, 3rd exception element (unbounded) --&gt;</span></span>
            <span class="code-tag">&lt;exception&gt;</span>org.apache.camel.spring.processor.onexception.OrderFailedException<span class="code-tag">&lt;/exception&gt;</span>
            <span class="code-tag"><span class="code-comment">&lt;!-- we can set the redelivery policy here as well --&gt;</span></span>
            <span class="code-tag">&lt;redeliveryPolicy maximumRedeliveries=<span class="code-quote">"1"</span>/&gt;</span>
            <span class="code-tag"><span class="code-comment">&lt;!-- mark this as handled --&gt;</span></span>
            <span class="code-tag">&lt;handled&gt;</span>
              <span class="code-tag">&lt;constant&gt;</span>true<span class="code-tag">&lt;/constant&gt;</span>
            <span class="code-tag">&lt;/handled&gt;</span>
            <span class="code-tag"><span class="code-comment">&lt;!-- let our order service handle this exception, call the orderFailed method --&gt;</span></span>
            <span class="code-tag">&lt;bean ref=<span class="code-quote">"orderService"</span> method=<span class="code-quote">"orderFailed"</span>/&gt;</span>
            <span class="code-tag"><span class="code-comment">&lt;!-- and since this is a unit test we use mock for assertions --&gt;</span></span>
            <span class="code-tag">&lt;to uri=<span class="code-quote">"mock:error"</span>/&gt;</span>
        <span class="code-tag">&lt;/onException&gt;</span>

        <span class="code-tag"><span class="code-comment">&lt;!-- in the normal route then route to our order service and call handleOrder method --&gt;</span></span>
        <span class="code-tag">&lt;bean ref=<span class="code-quote">"orderService"</span> method=<span class="code-quote">"handleOrder"</span>/&gt;</span>
        <span class="code-tag"><span class="code-comment">&lt;!-- and since this is a unit test we use mock for assertions --&gt;</span></span>
        <span class="code-tag">&lt;to uri=<span class="code-quote">"mock:result"</span>/&gt;</span>
    <span class="code-tag">&lt;/route&gt;</span>

<span class="code-tag">&lt;/camelContext&gt;</span></pre>
</div></div>

<h3><a name="ExceptionClause-Handlingandsendingafixedresponsebacktotheclient"></a>Handling and sending a fixed response back to the client</h3>
<p>In the route above we handled the exception but routed it to a different endpoint. What if you need to alter the response and send a fixed response back to the original caller (the client). No secret here just do as you do in normal Camel routing, use <a href="/confluence/display/CAMEL/Message+Translator" title="Message Translator">transform</a> to set the response, as shown in the sample below:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-comment">// we <span class="code-keyword">catch</span> MyFunctionalException and want to mark it as handled (= no failure returned to client)
</span><span class="code-comment">// but we want to <span class="code-keyword">return</span> a fixed text response, so we transform OUT body as Sorry.
</span>onException(MyFunctionalException.class)
        .handled(<span class="code-keyword">true</span>)
        .transform().constant(<span class="code-quote">"Sorry"</span>);</pre>
</div></div>

<h3><a name="ExceptionClause-OverloadingtheRedeliveryPolicy"></a>Overloading the RedeliveryPolicy</h3>

<p>The default error handler used in Camel is the <a href="/confluence/display/CAMEL/Dead+Letter+Channel" title="Dead Letter Channel">Dead Letter Channel</a> which supports attempting to redeliver the message exchange a number of times before sending it to a dead letter endpoint. Sometimes you want to overload the redelivery policy on a per exception type basis. By default in the above examples, if a ValidationException occurs then the message will not be redelivered; however if some other exception occurs (such as a JDBC deadlock or remote method invocation) the route will be retried. </p>

<p>However if you want to customize any methods on the <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/RedeliveryPolicy.html" title="Visit page outside Confluence" rel="nofollow">RedeliveryPolicy<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> object, you can do this via the fluent API...</p>

<div class="code"><div class="codeContent">
<pre class="code-java">onException(MyException.class).
  maximumRedeliveries(2);</pre>
</div></div>

<p>You can mix and match these approaches; specifying a custom processor to be used after all the redeliveries fail together with customizing any aspect of the <span class="nobr"><a href="http://activemq.apache.org/camel/maven/camel-core/apidocs/org/apache/camel/processor/RedeliveryPolicy.html" title="Visit page outside Confluence" rel="nofollow">RedeliveryPolicy<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> </p>

<p>And the spring DSL:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;onException&gt;</span>
   <span class="code-tag">&lt;exception&gt;</span>com.mycompany.MyException<span class="code-tag">&lt;/exception&gt;</span>
   <span class="code-tag">&lt;redelivyPolicy maximumRedeliveries=<span class="code-quote">"2"</span>/&gt;</span>
<span class="code-tag">&lt;/onException&gt;</span></pre>
</div></div>

<h3><a name="ExceptionClause-Definingmultipleexceptions"></a>Defining multiple exceptions</h3>
<p>You can define multiple exceptions in the clause as:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">onException(MyException.class, MyOtherException.class).
  maximumRedeliveries(2);</pre>
</div></div>

<p>And in Spring DSL you just add another exception element:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;onException&gt;</span>
   <span class="code-tag">&lt;exception&gt;</span>com.mycompany.MyException<span class="code-tag">&lt;/exception&gt;</span>
   <span class="code-tag">&lt;exception&gt;</span>com.mycompany.MyOtherException<span class="code-tag">&lt;/exception&gt;</span>
   <span class="code-tag">&lt;redelivyPolicy maximumRedeliveries=<span class="code-quote">"2"</span>/&gt;</span>
<span class="code-tag">&lt;/onException&gt;</span></pre>
</div></div>


<h3><a name="ExceptionClause-ReusingReliveryPolicy"></a>Reusing ReliveryPolicy</h3>
<p><b>Available as of Camel 1.5.1 or later</b><br/>
You can reference a <tt>RedeliveryPolicy</tt> so you can reuse existing configurations and use standard spring bean style configuration that supports property placeholders.</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;bean id=<span class="code-quote">"myRedeliveryPolicy"</span> class=<span class="code-quote">"org.apache.camel.processor.RedeliveryPolicy"</span>&gt;</span>
        <span class="code-tag">&lt;property name=<span class="code-quote">"maximumRedeliveries"</span> value=<span class="code-quote">"${myprop.max}"</span>/&gt;</span>
    <span class="code-tag">&lt;/bean&gt;</span>

     <span class="code-tag">&lt;onException&gt;</span>
         <span class="code-tag"><span class="code-comment">&lt;!-- you can define multiple exceptions just adding more exception elements as show below --&gt;</span></span>
         <span class="code-tag">&lt;exception&gt;</span>com.mycompany.MyFirstException<span class="code-tag">&lt;/exception&gt;</span>
         <span class="code-tag">&lt;exception&gt;</span>com.mycompany.MySecondException<span class="code-tag">&lt;/exception&gt;</span>

         <span class="code-tag"><span class="code-comment">&lt;!-- here we reference our redelivy policy defined above --&gt;</span></span>
         <span class="code-tag">&lt;redeliveryPolicy ref=<span class="code-quote">"myRedeliveryPolicy"</span>/&gt;</span>
     <span class="code-tag">&lt;/onException&gt;</span></pre>
</div></div>

<h3><a name="ExceptionClause-UsingfinegrainedselectionusingonWhen"></a>Using fine grained selection using <b>onWhen</b></h3>
<p><b>Available as of Camel 1.5.1 or later</b></p>

<p>You can attach an <a href="/confluence/display/CAMEL/Expression" title="Expression">Expression</a> to the exception clause to have fine grained control when a clause should be selected or not. As it's an <a href="/confluence/display/CAMEL/Expression" title="Expression">Expression</a> you can use any kind of code to perform the test. Here is a sample:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> void configure() <span class="code-keyword">throws</span> Exception {
    <span class="code-comment">// here we define our onException to <span class="code-keyword">catch</span> MyUserException when
</span>    <span class="code-comment">// there is a header[user] on the exchange that is not <span class="code-keyword">null</span>
</span>    onException(MyUserException.class).onWhen(header(<span class="code-quote">"user"</span>).isNotNull())
        .maximumRedeliveries(1)
        .to(ERROR_USER_QUEUE);

    <span class="code-comment">// here we define onException to <span class="code-keyword">catch</span> MyUserException as a kind
</span>    <span class="code-comment">// of fallback when the above did not match.
</span>    <span class="code-comment">// Noitce: The order how we have defined these onException is
</span>    <span class="code-comment">// important as Camel will resolve in the same order as they
</span>    <span class="code-comment">// have been defined
</span>    onException(MyUserException.class)
        .maximumRedeliveries(2)
        .to(ERROR_QUEUE);</pre>
</div></div>

<p>In the sample above we have two onException's defined. The first has an <b>onWhen</b> expression attached to only trigger if the message has a header with the key user that is not null. If so this clause is selected and is handling the thrown exception. The 2nd clause is a for coarse gained selection to select the same exception being thrown but when the expression is evaluated to false. <b>Notice:</b> this is not required, if the 2nd clause is omitted, then the default error handler will kick in.</p>

<h3><a name="ExceptionClause-Seealso"></a>See also</h3>
<p>The <a href="/confluence/display/CAMEL/Error+Handler" title="Error Handler">Error Handler</a> for the general error handling documentation<br/>
The <a href="/confluence/display/CAMEL/Dead+Letter+Channel" title="Dead Letter Channel">Dead Letter Channel</a> for further details.<br/>
The <a href="/confluence/display/CAMEL/Transactional+Client" title="Transactional Client">Transactional Client</a> for transactional behavior</p>

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