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From conflue...@apache.org
Subject [CONF] Apache Cayenne Documentation: Guide to 3.0 Features (page edited)
Date Sun, 17 May 2009 13:12:00 GMT
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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;
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/* alphabet list */
ul#squaretab {
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padding-left: 0;
white-space: nowrap;
font: bold 8px Verdana, sans-serif;
}

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}

#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;
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#squaretab li a#current {
background: white;
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.blogcalendar * {
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.blogcalendar th.calendarhead, a.calendarhead {
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    font-weight:bold;
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    color: #ffffff;
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.calendarhead:visited {color: white;}
.calendarhead:active {color: white;}
.calendarhead:hover {color: white;}

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

/* permissions page styles */
.permissionHeading {
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}
.permissionTab {
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.permissionSuperTab {
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.permissionCell {
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/* warning panel */
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/* alert panel */
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/* info panel */
.infoPanel { background: #D8E4F1; border:#3c78b5 1px solid; padding: 8px; margin: 10px; }

/* side menu highlighting (e.g. space content screen) */
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.optionSelected a { font-weight: bold; text-decoration: none; color: black; }

/* information macros */
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table.sectionMacroWithBorder td.columnMacro { border-style: dashed; border-width: 1px; border-color:
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.pagecontent
{
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/* styles for links in the top bar */
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.topBar {
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}


/* styles for extended operations */
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.greyLinks a:visited {color: #666666; text-decoration:underline;}
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*/
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.openPageHighlight {
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}

.editPageInsertLinks, .editPageInsertLinks a
{
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}

/* Style for label heatmap. */
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.heatmap {
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}

.heatmap a:hover {
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.heatmap li {
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}

.minitab {
padding: 3px 0px 3px 8px;
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margin-top: 1px;
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border-bottom: 1px solid #3c78b5;
font: bold 9px Verdana, sans-serif;
text-decoration: none;
float:none;
}
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padding: 3px 0.5em;
margin-left: 3px;
margin-top: 1px;
border: 1px solid #3c78b5;
background: white;
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color: #000000;
text-decoration: none;
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color: #ffffff;
text-decoration: none;
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a.newLabel:link {background-color: #ddffdd}
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ul.square {list-style-type: square}

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.inline-control-link a:link {text-decoration: none}
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.inline-control-link {
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div.auto_complete {
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div.auto_complete ul {
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div.auto_complete ul li {
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div.auto_complete ul li.selected {
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div.auto_complete ul strong.highlight {
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/******* Edit Page Styles *******/
.toogleFormDiv{
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    background-color:white;
    padding:5px;
    margin-top: 5px;
}

.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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}

.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
{
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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/CAYDOC">CAYDOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Guide+to+3.0+Features">Guide
to 3.0 Features</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAYDOC/Guide+to+3.0+Features">Guide
to 3.0 Features</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~andrus">Andrus
Adamchik</a>
            <span class="smallfont">(May 17, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=23305&originalVersion=60&revisedVersion=61">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><p>This page highlights the new features
and changes introduced in 3.0 release, roughly corresponding to the latest released milestone.
It is a high level overview and as such is by no means complete. Consult RELEASE-NOTES.txt
file included in each release for the full list of changes.</p>

<ul>
	<li><a href="#Guideto3.0Features-DistributionContentsStructure" title="Distribution
Contents Structure on Guide to 3.0 Features">Distribution Contents Structure</a></li>
	<li><a href="#Guideto3.0Features-CayenneJPAProvider" title="Cayenne JPA Provider
on Guide to 3.0 Features">Cayenne JPA Provider</a></li>
	<li><a href="#Guideto3.0Features-ObjectRelationalMapping" title="Object Relational
Mapping on Guide to 3.0 Features">Object Relational Mapping</a></li>
	<li><a href="#Guideto3.0Features-CayennePersistenceAPI" title="Cayenne Persistence
API on Guide to 3.0 Features">Cayenne Persistence API</a></li>
	<li><a href="#Guideto3.0Features-RemoteObjectPersistence" title="Remote Object Persistence
on Guide to 3.0 Features">Remote Object Persistence</a></li>
	<li><a href="#Guideto3.0Features-CayenneModeler" title="CayenneModeler on Guide
to 3.0 Features">CayenneModeler</a></li>
	<li><a href="#Guideto3.0Features-DeploymentandRuntime" title="Deployment and Runtime
on Guide to 3.0 Features">Deployment and Runtime</a></li>
	<li><a href="#Guideto3.0Features-Tools" title="Tools on Guide to 3.0 Features">Tools</a></li>
</ul>



<h2><a name="Guideto3.0Features-DistributionContentsStructure"></a>Distribution
Contents Structure</h2>

<ul>
	<li>There are a few changes in the contents of the distribution "lib" folder. For details
see <a href="/confluence/display/CAYDOC/JAR+Files+and+Dependencies" title="JAR Files and
Dependencies">this page</a>. Main Cayenne JAR is now called <tt>"cayenne-server-x.x.x.jar"</tt>.
We no longer ship the "fat" jar with dependencies. Instead dependencies are included in the
separate jars in <tt>"lib/third-party"</tt> distribution folder.</li>
	<li>CayenneModeler is located in the "bin" folder. Never mind the <tt>"lib/cayenne-modeler-x.x.x.jar"</tt>
- this is just an underlying Modeler <b>library</b>, used in "local JNDI" configuration
for instance, not the runnable application.</li>
</ul>


<h2><a name="Guideto3.0Features-CayenneJPAProvider"></a>Cayenne JPA Provider</h2>

<p><em>Note that Cayenne JPA provider work has been frozen and it IS NOT included
in 3.0. If you have further questions or would like to give a hand with the JPA work, please
send a note to <span class="nobr"><a href="http://cayenne.apache.org/mailing-lists.html"
title="Visit page outside Confluence" rel="nofollow">developer mailing list<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span>.</em></p>

<h2><a name="Guideto3.0Features-ObjectRelationalMapping"></a>Object Relational
Mapping</h2>

<h3><a name="Guideto3.0Features-KilledDerivedDbEntityConcept"></a>Killed
DerivedDbEntity Concept </h3>

<p>Stopped supporting <tt>DerivedDbEntity</tt> - its functionality (aggregate
queries) is achieved via EJBQL and other means.</p>

<h3><a name="Guideto3.0Features-Embeddables"></a>Embeddables</h3>
<p><em>(as of M4 there's no Modeler support)</em></p>

<p>Added a new mapping artifact - Embeddable, that allows to map composite objects to
a single table. </p>

<h3><a name="Guideto3.0Features-FlattenedAttributes"></a>Flattened Attributes</h3>
<p><em>(as of M4 there's no Modeler support)</em></p>

<p>Just like with "flattened" relationships, now there is a way to map an ObjAttribute
that spans one or more DbRelationships and is mapped to a column of a joined table.</p>

<h3><a name="Guideto3.0Features-PersistingPrimitivesandaNumberofOtherSimpleProperties"></a>Persisting
Primitives and a Number of Other Simple Properties</h3>

<p>DataObjects are now allowed to have primitive properties, such as int, boolean, etc.
Also Cayenne can now persist the following extra simple property types: java.util.Calendar,
java.math.BigInteger, java.io.Serializable, char[], java.lang.Character, java.lang.Character[],
java.lang.Byte[].</p>

<h3><a name="Guideto3.0Features-SupportforToManyRelationshipMapsandCollections."></a>Support
for To-Many Relationship Maps and Collections.</h3>

<p>In addition to mapping a to-many relationship as a List, Cayenne now supports to-many
Maps (keyed by target object pk, or an arbitrary unique property), Sets and generic Collections.
Note that relationship maps is the only conceptually new type of relationships. Collection
and Set are not that different from the earlier List behavior (that was a Collection, and
just like Set ensured uniqueness of its objects).</p>

<h3><a name="Guideto3.0Features-Supportfor%22extended%22EnumsMapping"></a>Support
for "extended" Enums Mapping</h3>

<p>In addition to vanilla Java enums, Cayenne allows enums to provide a custom database
value for each enumerated instance by implementing <tt>org.apache.cayenne.ExtendedEnumeration</tt>.
This way a persistent value doesn't have to be tied to the enum Java name or position.</p>

<h3><a name="Guideto3.0Features-DbAttributeScaleandPrecision"></a>DbAttribute
Scale and Precision</h3>

<p>Changed DbAttribute "precision" property to "scale" (as it meant scale all along)
and added a separate "precision" attribute to track precision.</p>


<h2><a name="Guideto3.0Features-CayennePersistenceAPI"></a>Cayenne Persistence
API</h2>

<h3><a name="Guideto3.0Features-Java5Migration"></a>Java 5 Migration</h3>

<p>Cayenne now requires Java 5 or newer to run. This allowed us to start using generics,
enums and other Java 5 features.</p>


<h3><a name="Guideto3.0Features-ObjectContext"></a>ObjectContext</h3>

<p>While you can still use DataContext directly, we encourage you to avoid direct dependency
on DataContext throughout your code, and instead use <tt>org.apache.cayenne.ObjectContext</tt>
interface. E.g.:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">ObjectContext context = DataContext.createDataContext();</pre>
</div></div>

<p>This protects your code from the evolution of the underlying implementation, allows
you to customize context behavior by using interface wrappers. There are plans to update all
Cayenne API to return ObjectContext everywhere DataContext might be returned.</p>

<h3><a name="Guideto3.0Features-EJBQLQueries"></a>EJB QL Queries</h3>

<p>Never mind the "EJB" in the name. EJBQL queries are a powerful object query mechanism
similar to the one supported by the JPA specification. <a href="/confluence/display/CAYDOC/EJBQLQuery"
title="EJBQLQuery">EJBQLQuery</a> is a first-class citizen, just like SelectQuery.</p>

<h3><a name="Guideto3.0Features-SQLTemplateQueryImprovements"></a>SQLTemplate
Query Improvements</h3>

<ul>
	<li><a href="/confluence/display/CAYDOC/Advanced+SQLTemplate" title="Advanced SQLTemplate">Significantly
simplified</a> the process for fetching DataObjects (vs. DataRows) via a SQLTemplate
query with <tt>'setColumnNamesCapitalization'</tt> method.</li>
	<li>Added support for <a href="/confluence/display/CAYDOC/SQLTemplate+Result+Mapping"
title="SQLTemplate Result Mapping">fetching scalar and mixed scalar/object results</a>
using <tt>SQLResultSetMapping</tt>.</li>
</ul>


<h3><a name="Guideto3.0Features-EntityLifecycleCallbacks"></a>Entity Lifecycle
Callbacks</h3>

<p>Cayenne lifecycle callbacks are similar to callbacks defined in the JPA specification.
This is a feature that allows to perform custom operations at certain points in the object
lifecycle. For more details see <a href="/confluence/display/CAYDOC/Lifecycle+Callbacks"
title="Lifecycle Callbacks">this page</a>.</p>

<h3><a name="Guideto3.0Features-GeneralQueryImprovements"></a>General Query
Improvements</h3>

<ul>
	<li>Added support for fetch offset (complimentary to the existing "fetch limit").</li>
</ul>


<h3><a name="Guideto3.0Features-DataContextChanges"></a>DataContext Changes</h3>

<p>Implemented <tt>DataContext.rollbackChangesLocally()</tt>. This was missing
in 2.0, limiting the operation of the nested DataContexts.</p>

<h3><a name="Guideto3.0Features-CacheManagement"></a>Cache Management</h3>

<ul>
	<li><a href="/confluence/display/CAYDOC/Caching+and+Fresh+Data" title="Caching and
Fresh Data">pluggable query cache</a></li>
	<li>a notion of Query cache groups</li>
	<li>automated cache key management for standard queries</li>
</ul>


<h3><a name="Guideto3.0Features-ExpressionImprovements"></a>Expression Improvements</h3>

<ul>
	<li>Added missing DB expressions to ExpressionFactory.</li>
	<li><a href="/confluence/display/CAYDOC/Path+Expressions" title="Path Expressions">Added
support</a> for OUTER JOINS</li>
	<li>Added support for matching against TRUE and FALSE.</li>
</ul>


<h3><a name="Guideto3.0Features-DatabaseIntegrationChanges%2FImprovements"></a>Database
Integration Changes/Improvements</h3>

<ul>
	<li>Added support for "long" primary keys (vs. "int" PK used previously)</li>
	<li>Added adapter for <span class="nobr"><a href="http://www.sqlite.org/"
title="Visit page outside Confluence" rel="nofollow">SQLite<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span> database.</li>
	<li>Added adapter for <span class="nobr"><a href="http://www.h2database.com/"
title="Visit page outside Confluence" rel="nofollow">H2<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span> database.</li>
	<li>Added stored procedure support on MySQL.</li>
	<li>Changed default table type on MySQL to InnoDB, added MySQL FK constraints support
in the Modeler.</li>
	<li>Turned on update query batching on SQL Server and Derby.</li>
</ul>


<h3><a name="Guideto3.0Features-ClassGenerationImprovements"></a>Class Generation
Improvements</h3>

<ul>
	<li>Generating classes for DataMaps that contain type-safe methods for all mapped SelectQueries.</li>
</ul>


<h3><a name="Guideto3.0Features-PrefetchingImprovements"></a>Prefetching
Improvements</h3>

<ul>
	<li>Joint prefetches are switched to OUTER joins, removing the major limitation to
their use.</li>
</ul>


<h3><a name="Guideto3.0Features-POJOPersistence"></a>POJO Persistence</h3>
<p><em>(status: preview)</em></p>

<ul>
	<li>Implemented class enhancer to enhance POJO's into org.apache.cayenne.Persistent</li>
</ul>



<h2><a name="Guideto3.0Features-RemoteObjectPersistence"></a>Remote Object
Persistence</h2>

<h3><a name="Guideto3.0Features-ValidationcallbackssupportforROPObjectContext"></a>Validation
callbacks support for ROP ObjectContext</h3>
<p>Now object validation works the same way on the ROP client as it did on the server.</p>

<h3><a name="Guideto3.0Features-NestedcontextssupportforROPObjectContext"></a>Nested
contexts support for ROP ObjectContext</h3>
<p>Nested contexts can now be created for ROP contexts. Creation method is added to
ObjectContext interface.</p>


<h2><a name="Guideto3.0Features-CayenneModeler"></a>CayenneModeler</h2>

<p>The Modeler underwent significant changes with the goal to improve usability and
look-and-feel.</p>

<ul>
	<li>Added copy/paste support</li>
	<li>Reworked ObjRelationship mapping dialog</li>
	<li>Added combo auto-completion</li>
	<li>Added a usable and good looking welcome screen</li>
	<li>Added contextual menus</li>
	<li>Added detection of project file changes on disk</li>
	<li>Added multi-item selection</li>
	<li>Added ability to specify password encryption mechanism</li>
	<li>Added ability to drag and drop cayenne.xml from the filesystem to the Modeler window
to open the project.</li>
	<li>Added support for to-many relationship collections mapping.</li>
	<li>Added "search" functionality</li>
	<li>Added lifecycle callback and listener mapping functionality.</li>
	<li>Added support for merging DataMap changes back to the database.</li>
	<li>Removed support for DerivedDbEntity</li>
	<li>Added confirmation dialog for delete actions</li>
	<li>Reopen Last Project on Startup</li>
	<li>Added progress/log view</li>
	<li>Added SQL syntax highlighting.</li>
	<li>Added EJBQL Query mapping capabilities, with synatx highlighting.</li>
	<li>Added support for quoting of SQL Identifiers</li>
</ul>



<h2><a name="Guideto3.0Features-DeploymentandRuntime"></a>Deployment and
Runtime</h2>

<h3><a name="Guideto3.0Features-ImprovedPerformance"></a>Improved Performance</h3>

<ul>
	<li>Paginated query algorithm is changed, resulting in very significant performance
improvements on large data sets (this also improves ROP paginated query performance). This
includes faster query times and much smaller memory footprint of an unresolved list.</li>
	<li>Reduced the scope of lock on a shared cache during commit, that should result in
improved concurrency.</li>
	<li>ROP new context creation speed is improved, as EntityResolver is cached on the
client after first retrieval.</li>
	<li>ROP uses a "diff compression" algorithm on commit, reducing the amount of data
passed around.</li>
</ul>


<h3><a name="Guideto3.0Features-ImprovedMemoryManagement"></a>Improved Memory
Management</h3>

<ul>
	<li><a href="/confluence/display/CAYDOC/ObjectContext+Memory+Management" title="ObjectContext
Memory Management">Leak free ObjectContext</a></li>
	<li>Query lists are cached in an LRU map, so there's no indefinite memory growth when
using query caching.</li>
</ul>


<h3><a name="Guideto3.0Features-LoggingSwitchedtocommonsloggingfromLog4J"></a>Logging
Switched to commons-logging from Log4J</h3>

<p>Cayenne no longer has a Log4J dependency. Instead it uses Jakarta commons-logging,
as described <a href="/confluence/display/CAYDOC/Configuring+Logging" title="Configuring
Logging">here</a>. Note that 2.0 Log4J configurations should continue to work, although
now it is a user responsibility to bootstrap Log4J - Cayenne will no longer do it for you.
E.g. you can do this on startup:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">org.apache.log4j.PropertyConfigurator.configure(<span class="code-quote">"cayenne-log.properties"</span>);</pre>
</div></div>

<h3><a name="Guideto3.0Features-OptionalQuotingofSQLIdentifiers"></a>Optional
Quoting of SQL Identifiers</h3>

<p>Cayenne now supports optional quoting of SQL identifiers in the generated SQL. This
has been a very popular request in the past. Identifier quoting can be turned on per DataMap
in the Modeler (look for "Quote SQL Identifiers" checkbox). This will allow to map column
names that contain spaces, non-ascii characters, reserved words, etc., i.e. the schemas that
could not be mapped with Cayenne before.</p>

<h2><a name="Guideto3.0Features-Tools"></a>Tools</h2>

<ul>
	<li>Switched <tt>"cgen"</tt> to "version 1.2" of the template as a default
version</li>
	<li>Support for classpath in <tt>"cdbgen"</tt>.</li>
</ul>
</div>


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