Configured the project to use Hibernate validation

This requires the Hibernate Tools (a part of JBoss Tools) to be
installed in Eclipse.

.project

@@ -25,10 +25,16 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
+		<buildCommand>
+			<name>org.hibernate.eclipse.console.hibernateBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.m2e.core.maven2Nature</nature>
 		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+		<nature>org.hibernate.eclipse.console.hibernateNature</nature>
 	</natures>
 </projectDescription>

.settings/org.eclipse.wst.common.project.facet.core.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <faceted-project>
-  <installed facet="jpt.jpa" version="2.1"/>
   <installed facet="java" version="11"/>
+  <installed facet="jpt.jpa" version="2.1"/>
 </faceted-project>

src/main/java/envoy/server/data/Group.java

@@ -24,7 +24,7 @@ import envoy.data.User;
 @Entity
 @Table(name = "groups")
 @NamedQuery(query = "SELECT g FROM Group g WHERE g.name = :name", name = "getGroupByName")
-public final class Group extends Contact {
+public class Group extends Contact {
 
 	/**
 	 * {@inheritDoc}

src/main/java/envoy/server/data/User.java

@@ -5,11 +5,12 @@ import java.util.stream.Collectors;
 
 import javax.persistence.*;
 
+import envoy.data.User.UserStatus;
+
 /**
- * This class serves as a way to let Hibernate communicate with the server
- * without bringing the dependency of JPA/Hibernate into the client.<br>
- * It will be referenced as "database user" to clarify between the different
- * user objects.<br>
+ * This class enables the storage of user specific data inside a database using
+ * Hibernate. Its objects will be referred to as database users as opposed to
+ * the common user objects present on both the client and the server.<br>
  * <br>
  * Project: <strong>envoy-server-standalone</strong><br>
  * File: <strong>User.java</strong><br>
@@ -30,13 +31,14 @@ import javax.persistence.*;
 		name = "searchUsers"
 	) }
 )
-public final class User extends Contact {
+public class User extends Contact {
 
 	private byte[] passwordHash;
 
 	@Temporal(TemporalType.TIMESTAMP)
-	private Date						lastSeen;
-	private envoy.data.User.UserStatus	status;
+	private Date lastSeen;
+
+	private UserStatus status;
 
 	/**
 	 * {@inheritDoc}
@@ -47,7 +49,7 @@ public final class User extends Contact {
 	}
 
 	/**
-	 * @return the passwordHash of a {link envoy.data.User}
+	 * @return the password hash
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public byte[] getPasswordHash() { return passwordHash; }
@@ -55,33 +57,30 @@ public final class User extends Contact {
 	/**
 	 * @param passwordHash the password hash to set
 	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see User#getPasswordHash()
 	 */
 	public void setPasswordHash(byte[] passwordHash) { this.passwordHash = passwordHash; }
 
 	/**
-	 * @return the last date an {link envoy.data.User} has been online
+	 * @return the last date the user has been online
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
 	public Date getLastSeen() { return lastSeen; }
 
 	/**
-	 * @param lastSeen the latest date at which has been seen to set
+	 * @param lastSeen the latest date at which the user has been online to set
 	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see User#getLastSeen()
 	 */
 	public void setLastSeen(Date lastSeen) { this.lastSeen = lastSeen; }
 
 	/**
-	 * @return the status of a {link envoy.data.User}
+	 * @return the status
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public envoy.data.User.UserStatus getStatus() { return status; }
+	public UserStatus getStatus() { return status; }
 
 	/**
 	 * @param status the status to set
 	 * @since Envoy Server Standalone v0.1-alpha
-	 * @see User#getStatus()
 	 */
-	public void setStatus(envoy.data.User.UserStatus status) { this.status = status; }
+	public void setStatus(UserStatus status) { this.status = status; }
 }