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From conflue...@apache.org
Subject [CONF] Apache ServiceMix: Classloaders (page edited)
Date Wed, 04 Jun 2008 12:23:03 GMT
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text-decoration: none;
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#foldertab li a:link { color: #ffffff; }
#foldertab li a:visited { color: #ffffff; }

#foldertab li a:hover {
color: #ffffff;
background: #003366;
border-color: #003366;
}

#foldertab li a.current {
background: white;
border-bottom: 1px solid white;
color: black;
}

#foldertab li a.current:link { color: black; }
#foldertab li a.current:visited { color: black; }
#foldertab li a.current:hover {
background: white;
border-bottom: 1px solid white;
color: black;
}

/* alphabet list */
ul#squaretab {
margin-left: 0;
padding-left: 0;
white-space: nowrap;
font: bold 8px Verdana, sans-serif;
}

#squaretab li {
display: inline;
list-style-type: none;
}

#squaretab a {
padding: 2px 6px;
border: 1px solid #3c78b5;
}

#squaretab a:link, #squaretab a:visited {
color: #fff;
background-color: #3c78b5;
text-decoration: none;
}

#squaretab a:hover {
color: #ffffff;
background-color: #003366;
border-color: #003366;
text-decoration: none;
}

#squaretab li a#current {
background: white;
color: black;
}

.blogcalendar * {
    font-family:verdana, arial, sans-serif;
    font-size:x-small;
    font-weight:normal;
    line-height:140%;
    padding:2px;
}


table.blogcalendar {
    border: 1px solid #3c78b5;
}

.blogcalendar th.calendarhead, a.calendarhead {
    font-size:x-small;
    font-weight:bold;
    padding:2px;
    text-transform:uppercase;
    background-color: #3c78b5;
    color: #ffffff;
    letter-spacing: .3em;
    text-transform: uppercase;
}

.calendarhead:visited {color: white;}
.calendarhead:active {color: white;}
.calendarhead:hover {color: white;}

.blogcalendar th {
    font-size:x-small;
    font-weight:bold;
    padding:2px;
    background-color:#f0f0f0;
}

.blogcalendar td {
    font-size:x-small;
    font-weight:normal;
}

.searchGroup { padding: 0 0 10px 0; background: #f0f0f0; }
.searchGroupHeading { font-size: 10px; font-weight: bold; color: #ffffff; background-color:
#3c78b5; padding: 2px 4px 1px 4px; }
.searchItem { padding: 1px 4px 1px 4px; }
.searchItemSelected { padding: 1px 4px 1px 4px; font-weight: bold; background: #ddd; }

/* permissions page styles */
.permissionHeading {
    border-bottom: #bbb; border-width: 0 0 1px 0; border-style: solid; font-size: 16px; text-align:
left;
}
.permissionTab {
    border-width: 0 0 0 1px; border-style: solid; background: #3c78b5; color: #ffffff; font-size:
10px;
}
.permissionSuperTab {
    border-width: 0 0 0 1px; border-style: solid; background: #003366; color: #ffffff;
}
.permissionCell {
    border-left: #bbb; border-width: 0 0 0 1px; border-style: solid;
}

/* warning panel */
.warningPanel { background: #FFFFCE; border:#F0C000 1px solid; padding: 8px; margin: 10px;
}
/* alert panel */
.alertPanel { background: #FFCCCC; border:#C00 1px solid; padding: 8px; margin: 10px; }
/* info panel */
.infoPanel { background: #D8E4F1; border:#3c78b5 1px solid; padding: 8px; margin: 10px; }

/* side menu highlighting (e.g. space content screen) */
.optionPadded { padding: 2px; }
.optionSelected { background-color: #ffffcc; padding: 2px; border: 1px solid #ddd; margin:
-1px; }
.optionSelected a { font-weight: bold; text-decoration: none; color: black; }

/* information macros */
.noteMacro { border-style: solid; border-width: 1px; border-color: #F0C000; background-color:
#FFFFCE; text-align:left; margin-top: 5px; margin-bottom: 5px}
.warningMacro { border-style: solid; border-width: 1px; border-color: #c00; background-color:
#fcc; text-align:left; margin-top: 5px; margin-bottom: 5px}
.infoMacro { border-style: solid; border-width: 1px; border-color: #3c78b5; background-color:
#D8E4F1; text-align:left; margin-top: 5px; margin-bottom: 5px}
.tipMacro { border-style: solid; border-width: 1px; border-color: #090; background-color:
#dfd; text-align:left; margin-top: 5px; margin-bottom: 5px}
.informationMacroPadding { padding: 5px 0 0 5px; }

table.infoMacro td, table.warningMacro td, table.tipMacro td, table.noteMacro td, table.sectionMacro
td {
    border: none;
}

table.sectionMacroWithBorder td.columnMacro { border-style: dashed; border-width: 1px; border-color:
#cccccc;}

.pagecontent
{
    padding: 10px;
    text-align: left;
}

/* styles for links in the top bar */
.topBarDiv a:link {color: #ffffff;}
.topBarDiv a:visited {color: #ffffff;}
.topBarDiv a:active {color: #ffffff;}
.topBarDiv a:hover {color: #ffffff;}
.topBarDiv {color: #ffffff;}

.topBar {
    background-color: #003366;
}


/* styles for extended operations */
.greyLinks a:link {color: #666666; text-decoration:underline;}
.greyLinks a:visited {color: #666666; text-decoration:underline;}
.greyLinks a:active {color: #666666; text-decoration:underline;}
.greyLinks a:hover {color: #666666; text-decoration:underline;}
.greyLinks {color: #666666; display:block; padding: 10px}

.logoSpaceLink {color: #999999; text-decoration: none}
.logoSpaceLink a:link {color: #999999; text-decoration: none}
.logoSpaceLink a:visited {color: #999999; text-decoration: none}
.logoSpaceLink a:active {color: #999999; text-decoration: none}
.logoSpaceLink a:hover {color: #003366; text-decoration: none}

/* basic panel (basicpanel.vmd) style */
.basicPanelContainer {border: 1px solid #3c78b5; margin-top: 2px; margin-bottom: 8px; width:
100%}
.basicPanelTitle {padding: 5px; margin: 0px; background-color: #f0f0f0; color: black; font-weight:
bold;}
.basicPanelBody {padding: 5px; margin: 0px}

.separatorLinks a:link {color: white}
.separatorLinks a:visited {color: white}
.separatorLinks a:active {color: white}

.greynavbar {background-color: #f0f0f0; border-top: 1px solid #3c78b5; margin-top: 2px}

div.headerField {
    float: left;
    width: auto;
    height: 100%;
}

.headerFloat {
    margin-left: auto;
    width: 50%;
}

.headerFloatLeft {
    float: left;
    margin-right: 20px;
    margin-bottom: 10px;
}

#headerRow {
    padding: 10px;
}

div.license-personal {
   background-color: #003366;
   color: #ffffff;
}

div.license-personal a {
   color: #ffffff;
}

.greyFormBox {
    border: 1px solid #cccccc;
    padding: 5px;
}

/* IE automatically adds a margin before and after form tags. Use this style to remove that
*/
.marginlessForm {
    margin: 0px;
}

.openPageHighlight {
    background-color: #ffffcc;
    padding: 2px;
    border: 1px solid #ddd;
}

.editPageInsertLinks, .editPageInsertLinks a
{
    color: #666666;
    font-weight: bold;
    font-size: 10px;
}

/* Style for label heatmap. */
.top10 a {
    font-weight: bold;
    font-size: 2em;
    color: #003366;
}
.top25 a {
    font-weight: bold;
    font-size: 1.6em;
    color: #003366;
}
.top50 a {
    font-size: 1.4em;
    color: #003366;
}
.top100 a {
    font-size: 1.2em;
    color: #003366;
}

.heatmap {
    list-style:none;
    width: 95%;
    margin: 0px auto;
}

.heatmap a {
    text-decoration:none;
}

.heatmap a:hover {
    text-decoration:underline;
}

.heatmap li {
    display: inline;
}

.minitab {
padding: 3px 0px 3px 8px;
margin-left: 0;
margin-top: 1px;
margin-bottom: 0px;
border-bottom: 1px solid #3c78b5;
font: bold 9px Verdana, sans-serif;
text-decoration: none;
float:none;
}
.selectedminitab {
padding: 3px 0.5em;
margin-left: 3px;
margin-top: 1px;
border: 1px solid #3c78b5;
background: white;
border-bottom: 1px solid white;
color: #000000;
text-decoration: none;
}
.unselectedminitab {
padding: 3px 0.5em;
margin-left: 3px;
margin-top: 1px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
color: #ffffff;
text-decoration: none;
}

a.unselectedminitab:hover {
color: #ffffff;
background: #003366;
border-color: #003366;
}

a.unselectedminitab:link { color: white; }
a.unselectedminitab:visited { color: white; }

a.selectedminitab:link { color: black; }
a.selectedminitab:visited { color: black; }

.linkerror { background-color: #fcc;}

a.labelOperationLink:link {text-decoration: underline}
a.labelOperationLink:active {text-decoration: underline}
a.labelOperationLink:visited {text-decoration: underline}
a.labelOperationLink:hover {text-decoration: underline}

a.newLabel:link {background-color: #ddffdd}
a.newLabel:active {background-color: #ddffdd}
a.newLabel:visited {background-color: #ddffdd}
a.newLabel:hover {background-color: #ddffdd}

ul.square {list-style-type: square}

.inline-control-link {
    background: #ffc;
    font-size: 9px;
    color: #666;
    padding: 2px;
    text-transform: uppercase;
    text-decoration: none;
}


.inline-control-link a:link {text-decoration: none}
.inline-control-link a:active {text-decoration: none}
.inline-control-link a:visited {text-decoration: none}
.inline-control-link a:hover {text-decoration: none}

.inline-control-link {
    background: #ffc;
    font-size: 9px;
    color: #666;
    padding: 2px;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
}

div.auto_complete {
    width: 350px;
    background: #fff;
}
div.auto_complete ul {
    border: 1px solid #888;
    margin: 0;
    padding: 0;
    width: 100%;
    list-style-type: none;
}
div.auto_complete ul li {
    margin: 0;
    padding: 3px;
}
div.auto_complete ul li.selected {
    background-color: #ffb;
}
div.auto_complete ul strong.highlight {
    color: #800;
    margin: 0;
    padding: 0;
}

/******* Edit Page Styles *******/
.toogleFormDiv{
    border:1px solid #A7A6AA;
    background-color:white;
    padding:5px;
    margin-top: 5px;
}

.toogleInfoDiv{
    border:1px solid #A7A6AA;
    background-color:white;
    display:none;
    padding:5px;
    margin-top: 10px;
}

.inputSection{
    margin-bottom:20px;
}

#editBox{
   border:1px solid lightgray;
   background-color:#F0F0F0;
}

/******* Left Navigation Theme Styles ********/
.leftnav li a {
    text-decoration:none;
    color:white;
    margin:0px;
    display:block;
    padding:2px;
    padding-left:5px;
    background-color: #3c78b5;
    border-top:1px solid #3c78b5;
}

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

/* Added by Shaun during i18n */
.replaced
{
    background-color: #33CC66;
}

.topPadding
{
    margin-top: 20px;
}

/* new form style */
.form-block {
    padding: 6px;
}
.form-error-block {
    padding: 6px;
    background: #fcc;
    border-top: #f0f0f0 1px solid;
    border-bottom: #f0f0f0 1px solid;
    margin-bottom: 6px;
    padding: 0 12px 0 12px;
}
.form-element-large {
    font-size: 16px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
}

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

.form-header {
    background: lightyellow;
    border-top: #f0f0f0 1px solid;
    border-bottom: #f0f0f0 1px solid;
    margin-bottom: 6px;
    padding: 0 12px 0 12px;
}
.form-header p, .form-block p, .form-error-block p {
    line-height: normal;
    margin: 12px 0 12px 0;
}
.form-example {
    color: #888;
    font-size: 11px;
}
.form-divider {
    border-bottom: #ccc 1px solid;
    margin-bottom: 6px;
}
.form-buttons {
    margin-top: 6px;
    border-top: #ccc 1px solid;
    border-bottom: #ccc 1px solid;
    background: #f0f0f0;
    padding: 10px;
    text-align: center;
}
.form-buttons input {
    width: 100px;
}
.form-block .error {
    padding: 6px;
    margin-bottom: 6px;
}
    -->
    </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/SM">SM</a> :
            <a href="http://cwiki.apache.org/confluence/display/SM/Classloaders">Classloaders</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/SM/Classloaders">Classloaders</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~tmielke">Torsten
Mielke</a>
            <span class="smallfont">(Jun 04, 2008)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>distinguish self-first configuration
for shared libraries and service units</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=39140&originalVersion=9&revisedVersion=10">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="Classloaders-Classloaders"></a>Classloaders</h1>

<p>There are several classloaders involved in ServiceMix:</p>
<ul>
	<li>the container class loader</li>
	<li>shared library class loader: the parent is the container class loader</li>
	<li>component class loader: parents are container class loader + any referenced SL
class loader</li>
	<li>service unit class loader: parent is the component class loader</li>
</ul>


<p>The container class loader contains: JRE + <tt>/conf</tt> + <tt>/lib/&#42;.jar</tt>
+ <tt>/lib/optional/&#42;.jar</tt>. ServiceMix 3.1, uses <span class="nobr"><a
href="http://classworlds.codehaus.org/" title="Visit page outside Confluence" rel="nofollow">Classworlds<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span> to configure a classloader finding
path. You can add your own path into the <tt>conf/servicemix.conf</tt> file.</p>


<p>The components class loaders are defined in the JBI spec and contain the jars referenced
in the JBI descriptor (<tt>META-INF/jbi.xml</tt>).  These class loaders can use
a parent-first (default) or self-first delegation. When a class is loaded, the class loader
will first ask its parent(s) and work back down the classloader hierarchy, or  will first
load the class from its referenced jars.</p>

<p>The service unit class loader is not specified in the JBI spec, because the SU content
is specific to each component.  In ServiceMix, all XBean based SUs may define their own classloader
using the &lt;classpath /&gt; location (though since ServiceMix 3.1 this is no longer
necessary, see the <a href="#Classloaders-NewinServiceMix3.1" title="New in ServiceMix
3.1 on Classloaders">last section below</a>).</p>

<p>Let's say you deploy a POJO to the servicemix-lwcontainer.  When building the configuration,
for XBean to find the class, it will ask the SU classloader to do so.  So the component may
be inside this classloader, or one of its parent (servicemix-lwcontainer, servicemix-shared
and the container classloader).  However, the component and SL classloaders are not easily
modified (you need to repackage the artifact and redeploy it), so you can put this class in
the SU or the container.</p>

<p>If you put this class in the container, you will need to restart the container after
having added the jar in the classpath, which is not what we want.  So usually, we put it in
the SU.</p>

<p>The other benefit of using classloaders is that you can have isolated components.
 You could deploy two components (or SU) which use different version of the same library without
any problems.  This is not possible if you put all the dependencies in the container classpath.</p>

<h2><a name="Classloaders-Selffirstdelegation"></a>Self-first delegation</h2>

<p>The common delegation mechanism for classloaders is to delegate to the parent first
when loading a class.  Thus, all classes defined in the container classloader are shared.
 But when a class references another class (using an import statement in the Java code for
example), the referenced classes will be loaded by the same classloader. To avoid such problems,
you can use a self-first delegation where classes are loaded from the classloader, and if
not found, it will ask its parent.</p>

<h3><a name="Classloaders-SharedlibrariesandSMXcomponents"></a>Shared libraries
and SMX components</h3>
<p>To enable self-first delegation for shared libraries and components change the service's
POM.XML to include</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;build&gt;</span>
  <span class="code-tag">&lt;plugins&gt;</span>
    <span class="code-tag">&lt;plugin&gt;</span>
      <span class="code-tag">&lt;groupId&gt;</span>org.apache.servicemix.tooling<span
class="code-tag">&lt;/groupId&gt;</span>
      <span class="code-tag">&lt;artifactId&gt;</span>jbi-maven-plugin<span
class="code-tag">&lt;/artifactId&gt;</span>
      <span class="code-tag">&lt;configuration&gt;</span>
        <span class="code-tag">&lt;classLoaderDelegation&gt;</span>self-first<span
class="code-tag">&lt;/classLoaderDelegation&gt;</span>
      <span class="code-tag">&lt;/configuration&gt;</span>
    <span class="code-tag">&lt;/plugin&gt;</span>
  <span class="code-tag">&lt;/plugins&gt;</span>
<span class="code-tag">&lt;/build&gt;</span></pre>
</div></div>

<h3><a name="Classloaders-SUClassloaders"></a>SU Classloaders</h3>

<p>XBean based service units can define their own classloader.  This can be done by
adding the following tag in the main XBean configuration file for the SU (<tt>xbean.xml</tt>
or <tt>servicemix.xml</tt> for the <tt>servicemix-lwcontainer</tt>
component):</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;classpath [inverse=<span
class="code-quote">"true"</span>]&gt;</span>
  [<span class="code-tag">&lt;nonOverrideable&gt;</span>xxx<span class="code-tag">&lt;/nonOverridable&gt;</span>]*
  [<span class="code-tag">&lt;hidden&gt;</span>xxx<span class="code-tag">&lt;/hidden&gt;</span>]*
  [<span class="code-tag">&lt;location&gt;</span>xxx<span class="code-tag">&lt;/location&gt;</span>]*
<span class="code-tag">&lt;/classpath&gt;</span></pre>
</div></div>
<p>The <tt>inverse</tt> attribute can be set to <tt>true</tt>
to use self-first delegation mode.</p>

<p>The <tt>nonOverridable</tt> tag can be used to specify that classes with
a name starting with the specified string can not be overridden by this classloader (the classloader
will always use the parent classes).</p>

<p>The <tt>hidden</tt> tag is used to hide specific classes (whose name
start with the specified string) defined by the parent classloader.</p>

<p>The <tt>location</tt> tag can be used to add jars or directories relative
to the SU root to the classloader.</p>

<h3><a name="Classloaders-NewinServiceMix3.1"></a>New in ServiceMix 3.1
</h3>

<p>Starting with ServiceMix 3.1, if no classpath is defined, or if no locations are
specified, the default ones will be automatically added in the SU classloader:</p>
<ul>
	<li><tt>/</tt></li>
	<li><tt>lib/*.jar</tt></li>
	<li><tt>lib/*.zip</tt></li>
</ul>


<p><em><b>For ServiceMix 3.0.x versions, you need to define the classpath
manually, as the default does not include any locations.</b></em></p>

<h3><a name="Classloaders-NewinServiceMix3.2"></a>New in ServiceMix 3.2</h3>

<p>You can now reference Shared Libraries and Components classloaders using the following
syntax:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;classpath [inverse=<span
class="code-quote">"true"</span>]&gt;</span>
  [<span class="code-tag">&lt;nonOverrideable&gt;</span>xxx<span class="code-tag">&lt;/nonOverridable&gt;</span>]*
  [<span class="code-tag">&lt;hidden&gt;</span>xxx<span class="code-tag">&lt;/hidden&gt;</span>]*
  [<span class="code-tag">&lt;location&gt;</span>xxx<span class="code-tag">&lt;/location&gt;</span>]*
  [<span class="code-tag">&lt;library&gt;</span>xxx<span class="code-tag">&lt;/library&gt;</span>]*
  [<span class="code-tag">&lt;component&gt;</span>xxx<span class="code-tag">&lt;/component&gt;</span>]*
<span class="code-tag">&lt;/classpath&gt;</span></pre>
</div></div>

<p>For example to reference the "cxf" shared library and the "servicemix-wsn2005" component
in addition to the jars inside the SU, you could write:</p>
<div class="code"><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;classpath&gt;</span>
  <span class="code-tag">&lt;library&gt;</span>cxf<span class="code-tag">&lt;/library&gt;</span>
  <span class="code-tag">&lt;component&gt;</span>servicemix-wsn2005<span
class="code-tag">&lt;/component&gt;</span>
<span class="code-tag">&lt;/classpath&gt;</span></pre>
</div></div>

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