[Helma-user] Apache Jackrabbit and basic Java interfacing

[Stefan Rinner]

On Jul 11, 2007, at 11:56 PM, Joshua Paine wrote:

> I'm building a content management system (isn't everyone?) and it  
> looks
> like using Apache Jackrabbit <http://jackrabbit.apache.org/> for a lot
> of the backend would save a lot of work and give me a pretty powerful
> platform to work from.
>
> Anyone tried making this work with Helma?

yes

> I would happily compose an
> honorary poem to anyone who could share working code.

here's some code - it's quite old (autumn 2005) so be aware of  
potential API changes
this code is basically just a ripoff of http://www.ibm.com/ 
developerworks/java/library/j-jcr/

var repositoryName;
var repositoryPath;
var repositoryConfigFile;

var env = new java.util.Hashtable();
var jackrabbit = Packages.org.apache.jackrabbit;
var repository = null;

env.put( Packages.javax.naming.Context.INITIAL_CONTEXT_FACTORY,  
"org.apache.jackrabbit.core.jndi.provider.DummyInitialContextFactory" );
env.put( Packages.javax.naming.Context.PROVIDER_URL, "localhost" );
var context = new Packages.javax.naming.InitialContext( env );
try {
	jackrabbit.core.jndi.RegistryHelper.registerRepository( context,  
repositoryName, repositoryConfigFile, repositoryPath, true );
}
catch( e ) {
	writeln( e );
}
repository = context.lookup( repositoryName );

var session = repository.login( new  
Packages.javax.jcr.SimpleCredentials( "userid", new java.lang.String 
( "" ).toCharArray() ) );

var rootNode = session.getRootNode();

var someotherNode = rootNode.getNode( "someNode" );

to be able to use objects returned from Jackrabbit in a more  
comfortable way (and e.g. to be able to skin them) it's best if you  
map them to a Helma Prototype via the class.properties file.
http://helma.org/docs/guide/properties/class.properties/ and http:// 
helma.org/pipermail/helma-user/2001-September/003865.html

> More basic: I'm still trying to get to where I can instantiate a given
> Java class in Helma. I have successfully done built-in Java  
> classes, but
> I haven't been able to instantiate any from JARs yet. I'm sure it's
> because I'm missing some critical and obvious step. I've tried putting
> the jars in lib/ext, and Helma says its adding them to the classpath
> when it starts up, but I don't seem to be accessing anything real via
> Packages.org.apache.jackrabbit...


after putting all necessary jars into lib/ext it should work

stefan