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diff --git a/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/ldap/client/LDAPClientFactoryImpl.java b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/ldap/client/LDAPClientFactoryImpl.java
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+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.knowcenter.wag.egov.egiz.ldap.client;
+
+import iaik.asn1.ObjectID;
+import iaik.asn1.structures.Name;
+import iaik.utils.RFC2253NameParser;
+import iaik.utils.RFC2253NameParserException;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Hashtable;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.commons.lang.ArrayUtils;
+import org.apache.log4j.Logger;
+
+/**
+ * @author <a href="mailto:thomas.knall@iaik.tugraz.at">Thomas Knall</a>
+ */
+public final class LDAPClientFactoryImpl extends LDAPClientFactory {
+
+	private final Logger log = Logger.getLogger(getClass());
+	
+	private Hashtable ldapClients;
+
+	protected LDAPClientFactoryImpl() {
+		this.ldapClients = new Hashtable();
+	}
+	
+	public static String rfc2253Name2Domain(Name name) {
+		Object[] values = name.getRDNValues(ObjectID.domainComponent);
+		if (values == null) {
+			return null;
+		}
+		StringBuffer buffer = new StringBuffer();
+		for (int i = 0; i < values.length; i++) {
+			buffer.append(values[i]);
+			if (i+1 < values.length) {
+				buffer.append(".");
+			}
+		}
+		return buffer.toString();
+	}
+	
+	public static String rfc2253Name2Domain(String nameString) throws RFC2253NameParserException {
+		RFC2253NameParser nameParser = new RFC2253NameParser(nameString);
+		return rfc2253Name2Domain(nameParser.parse());
+	}
+
+	private List instantiateLDAPClients(String issuerName) throws LDAPException {
+		if (!super.hasBeenConfigured()) {
+			log.warn(super.getClass().getName() + " has not been configured yet.");
+		}
+		List ldapClients = new ArrayList();
+		List mappings = super.getMappings(issuerName);
+		if (mappings == null || mappings.isEmpty()) {
+			try {
+				String alternativeURLString = rfc2253Name2Domain(issuerName);
+				if (alternativeURLString == null || alternativeURLString.length() == 0) {
+					throw new LDAPException("Neither issuer name \"" + issuerName + "\" has been registered nor domain components were provided.");
+				}
+				alternativeURLString = "ldap://" + alternativeURLString;
+				log.warn("Issuer name \"" + issuerName + "\" has not been registered; trying to instantiate client for url \"" + alternativeURLString + "\"...");
+				LDAPClient client = new LDAPClientImpl(alternativeURLString);
+				ldapClients.add(client);
+			} catch (RFC2253NameParserException e) {
+				throw new LDAPException(e);
+			}
+		} else {
+			log.debug("Instantiating LDAP clients for " + ArrayUtils.toString(mappings.toArray()) + ".");
+			Iterator mappingIt = mappings.iterator();
+			while (mappingIt.hasNext()) {
+			   LDAPMapping mapping = (LDAPMapping) mappingIt.next();
+			   ldapClients.add(new LDAPClientImpl(mapping));
+			}
+		}
+		return ldapClients;
+	}
+	
+	public synchronized List createClients(String issuerName) throws LDAPException {
+		if (issuerName == null) {
+			throw new NullPointerException("Issuer name must not be null.");
+		}
+		if (issuerName.length() == 0) {
+			throw new IllegalArgumentException("Issuer name must not be empty.");
+		}
+		List ldapClientList = (List) ldapClients.get(issuerName);
+		if (ldapClientList == null) {
+		   ldapClientList = instantiateLDAPClients(issuerName);
+			ldapClients.put(issuerName, ldapClientList);
+		}
+		return Collections.unmodifiableList(ldapClientList);
+	}
+
+}