gistfile1.java

@Component(immediate = true)
public class Configurer {

    @Reference
    private ConfigurationAdmin cfgAdmin;

    protected void activate(ComponentContext ctx) throws Exception {
        Configuration cfg = cfgAdmin.getConfiguration(
                "org.apache.sling.jcr.resource.internal.JcrResourceResolverFactoryImpl", null);
        Dictionary props = new Hashtable();
        props.put("resource.resolver.multiworkspace", "true");
        cfg.update(props);
    }
}