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From conflue...@apache.org
Subject [CONF] Apache Sling: FAQ (page edited)
Date Mon, 07 Jan 2008 10:49:00 GMT
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text-decoration: none;
}

#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/SLING">SLING</a>
:
            <a href="http://cwiki.apache.org/confluence/display/SLING/FAQ">FAQ</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/SLING/FAQ">FAQ</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~fmeschbe">Felix
Meschberger</a>
            <span class="smallfont">(Jan 07, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=73883&originalVersion=1&revisedVersion=2">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="FAQ-FrequentlyAskedQuestions"></a>Frequently
Asked Questions</h1>

<p>This page lists a series of common questions and answers. It is of course work in
progress ...</p>

<div>
<ul>
  <li>
<ul>
  <li><a href='#FAQ-AccessingClassesfromtheEnvironment'>Accessing Classes from
the Environment</a></li>
  <li><a href='#FAQ-HowdoesSlingsupportthe%7B%7Borg.osgi.framework.bootdelegation%7D%7DProperty%3F'>How
does Sling support the <tt>org.osgi.framework.bootdelegation</tt> Property ?</a></li>
  <li><a href='#FAQ-HowdoseSlingsupportthe%7B%7Borg.osgi.framework.system.packages%7D%7DProperty%3F'>How
dose Sling support the <tt>org.osgi.framework.system.packages</tt> Property ?</a></li>
  <li><a href='#FAQ-Shouldthe%7B%7Borg.osgi.framework.bootdelegation%7D%7Dorthe%7B%7Borg.osgi.framework.system.packages%7D%7DPropertybeused%3F'>Should
the <tt>org.osgi.framework.bootdelegation</tt> or the <tt>org.osgi.framework.system.packages</tt>
Property be used ?</a></li>
</ul></li>
</ul></div>

<h3><a name="FAQ-AccessingClassesfromtheEnvironment"></a>Accessing Classes
from the Environment</h3>

<p>Mostly when using the Sling Web Application, that is running Sling inside a web application
deployed into some servlet container, you might want to share classes between the servlet
container and Sling. Some examples of such sharing are:</p>

<ol>
	<li>Accessing EJB from the Application Server</li>
	<li>Sharing classe with another web application such as a Jackrabbit instance</li>
	<li>Using other container features</li>
</ol>


<p>For such cases the OSGi Core Specification provides a functionality to declare such
class sharing. The functionality is defined in terms of two Framework properties <tt>org.osgi.framework.system.packages</tt>
and <tt>org.osgi.framework.bootdelegation</tt>:</p>


<ol>
	<li><b><tt>org.osgi.framework.bootdelegation</tt></b> &#8211;
All classes matching any entry in this list are always loaded from the parent class loader
and not through the OSGi framework infrastructure. This property is a comma separated list
of package names. A package name may be terminated by a wildcard character such that any package
starting with the list entry matches the entry and thus will be used from the parent class
loader.</li>
	<li><b><tt>org.osgi.framework.system.packages</tt></b> &#8211;
Additional package declarations for packages to be exported from the system bundle. This property
is a simple package declaration list just like any <tt>Export-Package</tt> manifest
header. In a sense the <tt>org.osgi.framework.system.packages</tt> property may
be seen as the <tt>Export-Package</tt> manifest header of the system bundle. Namely
these entries may not contain wildcards (as is allowed for the <tt>bootdelegation</tt>
property) and may contain directives and attributes such as the <tt>uses</tt>
directive and the <tt>version</tt> attribute. It is recommended to provide this
additional information to help in resolving the bundles. The OSGi Core Specification even
prescribes the use of the <tt>uses</tt> directive.</li>
</ol>


<p>The problem with the <tt>org.osgi.framework.bootdelegation</tt> property
is, that it completely bypasses any bundle import wirings and just asks the parent classloader.
Such situations are not easily recognizable. Therefore the Sling Console will be enhanced
to mark any package import which matchs an entry in the <tt>org.osgi.framework.bootdelegation</tt>
appropriately (<span class="nobr"><a href="ttps://issues.apache.org/jira/browse/SLING-148"
title="Visit page outside Confluence" rel="nofollow">SLING-148<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span>).</p>

<p>Also note, that any package listed as an import in a bundle must be resolveable for
the bundle resolve. The import resolution process does not take the <tt>org.osgi.framework.bootdelegation</tt>
configuration into account. This means, that regardless of whether a package is listed in
the <tt>org.osgi.framework.bootdelegation</tt> property or not, if the package
is listed as a required import in the <tt>Import-Package</tt> header, it must
be exported by some other bundle.</p>


<h3><a name="FAQ-HowdoesSlingsupportthe%7B%7Borg.osgi.framework.bootdelegation%7D%7DProperty%3F"></a>How
does Sling support the <tt>org.osgi.framework.bootdelegation</tt> Property ?</h3>

<p>Sling supports the <tt>org.osgi.framework.bootdelegation</tt> property
to list additional classes to be used from the environment by interpreting Sling configuration
properties starting with <tt>sling.bootdelegation</tt> (This is done in the <tt>org.apache.sling.launcher.app.Sling.resolve()</tt>
method).</p>

<p>If a property starts with the prefix <tt>sling.bootdelegation.class.</tt>
the list of packages defined as the property value is only appended to the <tt>org.osgi.framework.bootdelegation</tt>
property if the fully qualified class taken from the rest of the property name exists in the
parent class loader.</p>

<p>If the property does not start with this <tt>sling.bootdelegation.class.</tt>
property, the list of packages is just appended to the <tt>org.osgi.framework.bootdelegation</tt>
property.</p>


<h3><a name="FAQ-HowdoseSlingsupportthe%7B%7Borg.osgi.framework.system.packages%7D%7DProperty%3F"></a>How
dose Sling support the <tt>org.osgi.framework.system.packages</tt> Property ?</h3>

<p>Currently extending the <tt>org.osgi.framework.system.packages</tt> property
in a Sling configuration file is only possibly by setting the <tt>org.apache.sling.launcher.system.packages</tt>
property. The value of this property, which <em>must</em> start with a comma,
is just appended to the <tt>org.osgi.framewrok.system.packages</tt> property.</p>

<p>A more elaborate support as is supported for the <tt>org.osgi.framework.bootdelegation</tt>
Property is being prepared (<span class="nobr"><a href="http://issues.apache.org/jira/browse/SLING-147"
title="Visit page outside Confluence" rel="nofollow">SLING-147<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span>).</p>


<h3><a name="FAQ-Shouldthe%7B%7Borg.osgi.framework.bootdelegation%7D%7Dorthe%7B%7Borg.osgi.framework.system.packages%7D%7DPropertybeused%3F"></a>Should
the <tt>org.osgi.framework.bootdelegation</tt> or the <tt>org.osgi.framework.system.packages</tt>
Property be used ?</h3>

<p>So, what mechanism should be used ? The answer is, that it depends. </p>

<p>Most of the time, you will want to use the <tt>org.osgi.framework.system.packages</tt>
property. Because this property ensures that you will allways benefit from the normal class
resolution mechanism through package imports and exports.</p>

<p>This allows creating the bundles normally by having the package import lists being
built according to the packages used by the bundle classes. For example you may use the Apache
Felix Maven Bundle Plugin to build your OSGi bundles and the imports are automatically calculated
(by default).</p>

<p>The drawback of this method is, that there may be bundles in your system, which export
packages also listed in the <tt>org.osgi.framework.system.packages</tt> property.
Depending on the export version, the wrong package may be bound. So to prevent such collisions
you should not install such bundles.</p>

<p>An example of such a declaration is the Servlet API packages (<tt>javax.servlet</tt>,
<tt>javax.servlet.http</tt> and <tt>javax.servlet.resources</tt>).
These packages are imported into the OSGi framework by the <tt>SlingServlet</tt>
of the <tt>launcher/webapp</tt> project as part of the <tt>org.osgi.framework.system.packages</tt>
property. To have this work correctly, no bundle should export the respective packages. In
the case of Sling, this means, the <tt>org.apache.felix.commons.sling-api</tt>
bundle must not be installed.</p>

<p>If on the other hand you cannot prevent the installation of such bundles and hence
the export of the respective packages, you might want to set the <tt>org.osgi.framework.bootdelegation</tt>
property conditionally as described above in the answer to how this property is supported
in Sling. This ensures the property is only set, if the classes are actually available. This
should be used as a fall back only, if the <tt>org.osgi.framework.system.packages</tt>
method does not work.</p></div>


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