How to create repository instance in JackRabbit Oak using MongoMK - mongodb

Question

I am trying to Create a Oak's JCR repository to store content with " Apache Oak over MongoDB".
(which i have absolutely no idea)
Here's what iv'e been doing.
MongoClient connection = new MongoClient("127.0.0.1", 27017);
DB db = connection.getDB("test");
MongoMK.Builder m = new MongoMK.Builder();
MongoMK kernel = m.setMongoDB(db).open();
Repository repo = new Jcr().createRepository();
session = repo.login(); // Error javax.jcr.NoSuchWorkspaceException
Was trying to link "Repository " to "MongoMK" - which seems like a nightmare.
I have tried doing
Repository repo = new Jcr(kernel).createRepository(); //Error
I found something similiar # [How to create repository instance in JackRabbit Oak using MicroKernel , that didn't help either.
My question being, is there anyway to link-up MongMK - Repository ??
P.S - Tried using "NodeStore".

Answer 1

Yes, this was not well documented. The following should work:
import javax.jcr.Node;
import javax.jcr.Repository;
import javax.jcr.Session;
import org.apache.jackrabbit.oak.Oak;
import org.apache.jackrabbit.oak.plugins.document.DocumentMK;
import org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore;
import org.apache.jackrabbit.oak.spi.security.OpenSecurityProvider;
import com.mongodb.DB;
import com.mongodb.MongoClient;
public class Test {
public static void main(String... args) throws Exception {
DB db = new MongoClient("127.0.0.1", 27017).getDB("test2");
DocumentNodeStore ns = new DocumentMK.Builder().
setMongoDB(db).getNodeStore();
Repository repo = new Jcr(new Oak(ns))
.with(new OpenSecurityProvider())
.createRepository();
Session session = repo.login();
Node root = session.getRootNode();
if (root.hasNode("hello")) {
Node hello = root.getNode("hello");
long count = hello.getProperty("count").getLong();
hello.setProperty("count", count + 1);
System.out.println("found the hello node, count = " + count);
} else {
System.out.println("creating the hello node");
root.addNode("hello").setProperty("count", 1);
}
session.save();
session.logout();
ns.dispose();
}
}
This is now also documented.