Friday, December 08, 2006

Spring 2.0 and the P-Namespace

Some days ago Rod Johnson blogged about an undocumented feature of Spring 2.0: the so-called P-Namespace, which permits you to shorten the XML configuration.
This feature has been very well welcomed by the developers community, because it clearly makes the Spring XML configuration easier to manage and read, without running into the burden of writing a custom namespace handler.

I strongly suggest you to give it a try.

As a consequence, many people started asking more, and in particular many people I know asked about the possibility of applying the same kind of configuration to collection and map properties.
Too bad, this seems to be impossible, but I'm here for giving my two cents about another (documented) way of configuring collections, that is IMHO easier to read. It uses the P-Namespace and the util schema, here is a sample:

<beans xmlns=""

<util:set id="contents">
<bean id="c1" class="org.acme.Content" p:name="c1"/>
<bean id="c2" class="org.acme.Content" p:name="c2"/>
<bean id="c3" class="org.acme.Content" p:name="c3"/>

<bean id="container" class="org.acme.Container" p:name="container" p:contentList-ref="contents"/>


As you can see, you have to simply configure your collection with the util schema (that makes it reusable, too), and then inject it with the P-Namespace!

I hope you'll find it useful!

1 comment:

Anonymous said...

Thanks, it was very useful.

Do you have any idea how props mappings could be defined in similar fashion?