OO-756: check the key of the owner of lockentry instead of user name as the...

OO-756: check the key of the owner of lockentry instead of user name as the user name can be changed after the user be deleted

src/main/java/org/olat/commons/coordinate/cluster/lock/ClusterLocker.java

@@ -170,6 +170,7 @@ public abstract class ClusterLocker implements Locker, GenericEventListener {
 	 * Use 'releaseLock' as method to release a lock. 
 	 * @param lock  release this lockentry 
 	 */
+	@Override
 	public void releaseLockEntry(LockEntry lockEntry) {
 		String asset = lockEntry.getKey();
 		Identity releaseRequestor = lockEntry.getOwner();
@@ -184,7 +185,7 @@ public abstract class ClusterLocker implements Locker, GenericEventListener {
 		} else {
 			// check that entry was previously locked by the same user that now wants to release the lock.
 			Identity ownwer = li.getOwner();
-			if (releaseRequestor.getName().equals(ownwer.getName())) {
+			if (releaseRequestor.getKey().equals(ownwer.getKey())) {
 				// delete the lock
 				clusterLockManager.deleteLock(li);
 			} else {

src/main/java/org/olat/core/util/coordinate/LockEntry.java

@@ -25,6 +25,8 @@
 */ 
 package org.olat.core.util.coordinate;
 
+import java.io.Serializable;
+
 import org.olat.core.id.Identity;
 /**
  * Description: <br>
@@ -32,7 +34,10 @@ import org.olat.core.id.Identity;
  * 
  * @author Felix Jost
  */
-public class LockEntry {
+public class LockEntry implements Serializable {
+
+	private static final long serialVersionUID = -319510836505419325L;
+	
 	private long lockAquiredTime;
 	private Identity owner;
 	private final String key;