Simplest standalone ApacheDS server

package hk.quantr.apachedsembeddedserver;

import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.directory.api.ldap.model.constants.SchemaConstants;
import org.apache.directory.api.ldap.model.schema.LdapComparator;
import org.apache.directory.api.ldap.model.schema.comparators.NormalizingComparator;
import org.apache.directory.api.ldap.model.schema.registries.ComparatorRegistry;
import org.apache.directory.api.ldap.model.schema.registries.SchemaLoader;
import org.apache.directory.api.ldap.schema.extractor.SchemaLdifExtractor;
import org.apache.directory.api.ldap.schema.extractor.impl.DefaultSchemaLdifExtractor;
import org.apache.directory.api.ldap.schema.loader.LdifSchemaLoader;
import org.apache.directory.api.ldap.schema.manager.impl.DefaultSchemaManager;
import org.apache.directory.server.constants.ServerDNConstants;
import org.apache.directory.server.core.DefaultDirectoryService;
import org.apache.directory.server.core.api.InstanceLayout;
import org.apache.directory.server.core.api.partition.Partition;
import org.apache.directory.server.core.api.schema.SchemaPartition;
import org.apache.directory.server.core.factory.JdbmPartitionFactory;
import org.apache.directory.server.core.partition.ldif.LdifPartition;
import org.apache.directory.server.ldap.LdapServer;
import org.apache.directory.server.protocol.shared.transport.TcpTransport;
import org.apache.directory.server.protocol.shared.transport.Transport;

/**
 *
 * @author Peter <peter@quantr.hk>
 */
public class ApacheDSEmbeddedServer {

	public static void main(String[] args) throws ClassNotFoundException, Exception {
		DefaultDirectoryService directoryService = new DefaultDirectoryService();

		File workingDirector = new File("working_dir");
		InstanceLayout instanceLayout = new InstanceLayout(workingDirector);
		directoryService.setInstanceLayout(instanceLayout);

		File schemaRepository = new File(workingDirector.getName(), "schema");
		SchemaLdifExtractor extractor = new DefaultSchemaLdifExtractor(workingDirector);
		try {
			extractor.extractOrCopy();
		} catch (IOException ioe) {
			// The schema has already been extracted, bypass
		}
		SchemaLoader loader = new LdifSchemaLoader(schemaRepository);
		DefaultSchemaManager schemaManager = new DefaultSchemaManager(loader);
		schemaManager.loadAllEnabled();
		ComparatorRegistry comparatorRegistry = schemaManager.getComparatorRegistry();

		for (LdapComparator<?> comparator : comparatorRegistry) {
			if (comparator instanceof NormalizingComparator) {
				((NormalizingComparator) comparator).setOnServer();
			}
		}
		directoryService.setSchemaManager(schemaManager);

		// Init the schema partation
		LdifPartition ldifPartition = new LdifPartition(schemaManager, directoryService.getDnFactory());
		ldifPartition.setPartitionPath(new File(workingDirector.getName(), "schema").toURI());
		SchemaPartition schemaPartition = new SchemaPartition(schemaManager);
		schemaPartition.setWrappedPartition(ldifPartition);
		directoryService.setSchemaPartition(schemaPartition);
		List<Throwable> errors = schemaManager.getErrors();

		// Inject the System Partition
		JdbmPartitionFactory partitionFactory = new JdbmPartitionFactory();
		Partition systemPartition = partitionFactory.createPartition(directoryService.getSchemaManager(), directoryService.getDnFactory(), "system", ServerDNConstants.SYSTEM_DN, 500, new File(directoryService.getInstanceLayout().getPartitionsDirectory(), "system"));
		systemPartition.setSchemaManager(directoryService.getSchemaManager());
		partitionFactory.addIndex(systemPartition, SchemaConstants.OBJECT_CLASS_AT, 100);
		directoryService.setSystemPartition(systemPartition);

//		schemaManager.loadAllEnabled();
//		SchemaPartition schemaPartition = new SchemaPartition(schemaManager);
//		directoryService.setSchemaPartition(schemaPartition);
		LdapServer ldapServer = new LdapServer();
		ldapServer.setDirectoryService(directoryService);
		ldapServer.setServiceName("DefaultLDAP");
		Transport ldap = new TcpTransport("0.0.0.0", 10389, 3, 5);
		ldapServer.addTransports(ldap);

//		LdifFileLoader ldifLoader = new LdifFileLoader(directoryService.getAdminSession(), "users.ldif");
//		ldifLoader.execute();
		directoryService.startup();
		ldapServer.start();
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>hk.quantr</groupId>
	<artifactId>ApacheDSEmbeddedServer</artifactId>
	<version>1.0</version>
	<packaging>jar</packaging>
	<name>ApacheDS Embedded Server</name>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>21</maven.compiler.source>
		<maven.compiler.target>21</maven.compiler.target>
		<exec.mainClass>hk.quantr.apachedsembeddedserver.ApacheDSEmbeddedServer</exec.mainClass>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.apache.directory.server</groupId>
			<artifactId>apacheds-all</artifactId>
			<version>2.0.0.AM27</version>
		</dependency>
	</dependencies>
</project>