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diff --git a/security/impl/src/main/java/org/wamblee/usermgt/jpa/JpaUserSet.java b/security/impl/src/main/java/org/wamblee/usermgt/jpa/JpaUserSet.java
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+/*
+ * Copyright 2005-2010 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.wamblee.usermgt.jpa;
+
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+
+import javax.persistence.EntityManager;
+import javax.persistence.NoResultException;
+import javax.persistence.TypedQuery;
+
+import org.wamblee.cache.Cache;
+import org.wamblee.persistence.JpaMergeSupport;
+import org.wamblee.security.encryption.MessageDigester;
+import org.wamblee.usermgt.AbstractUserSet;
+import org.wamblee.usermgt.Group;
+import org.wamblee.usermgt.NameValidator;
+import org.wamblee.usermgt.User;
+
+/**
+ * User set backed by the database.
+ * 
+ * @author Erik Brakkee
+ */
+public class JpaUserSet extends AbstractUserSet {
+
+    /**
+     * Cache of users. Every user in the cache has its password validator and
+     * encoder set.
+     */
+    private Cache<String, User> cache;
+
+    private EntityManager entityManager;
+
+    /**
+     * Constructs a user set backed by the database.
+     * 
+     * @param aCache
+     *            User cache to use.
+     */
+    public JpaUserSet(Cache<String, User> aCache,
+        NameValidator aPasswordValidator, MessageDigester aPasswordEncoder,
+        EntityManager aEntityManager) {
+        super(aPasswordValidator, aPasswordEncoder);
+        cache = aCache;
+        entityManager = aEntityManager;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#userModified(org.wamblee.usermgt.User)
+     */
+    public void userModified(User aUser) {
+        assert aUser.getPrimaryKey() != null;
+        User merged = entityManager.merge(aUser);
+        // Need to flush the entity manager to make sure the version is updated. 
+        entityManager.flush();
+        JpaMergeSupport.merge(merged, aUser);
+        cache.remove(aUser.getName());
+        setPasswordInfo(aUser);
+        cache.put(aUser.getName(), new User(aUser));
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#find(java.lang.String)
+     */
+    public User find(String aName) {
+        User user = cache.get(aName);
+
+        if (user != null) {
+            return user;
+        }
+
+        TypedQuery<User> query = entityManager.createNamedQuery(
+            User.QUERY_FIND_BY_NAME, User.class);
+        query.setParameter(User.NAME_PARAM, aName);
+        try {
+            user = query.getSingleResult();
+            user = new User(user);
+            setPasswordInfo(user);
+            cache.put(aName, user);
+            return user;
+        } catch (NoResultException e) {
+            return null;
+        }
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#contains(org.wamblee.usermgt.User)
+     */
+    public boolean contains(User aUser) {
+        return find(aUser.getName()) != null;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#add(org.wamblee.usermgt.User)
+     */
+    public boolean add(User aUser) {
+        assert aUser.getPrimaryKey() == null;
+
+        if (contains(aUser)) {
+            return false;
+        }
+
+        entityManager.persist(aUser);
+        setPasswordInfo(aUser);
+        cache.put(aUser.getName(), aUser);
+
+        return true;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#remove(org.wamblee.usermgt.User)
+     */
+    public boolean remove(User aUser) {
+        if (!contains(aUser)) {
+            return false;
+        }
+
+        User user = entityManager.merge(aUser);
+        entityManager.remove(user);
+        cache.remove(aUser.getName());
+
+        return true;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#list()
+     */
+    public Set<User> list() {
+        Set<User> users = new TreeSet<User>();
+        List<User> list = entityManager.createNamedQuery(User.QUERY_ALL_USERS,
+            User.class).getResultList();
+
+        for (User user : list) {
+            setPasswordInfo(user);
+            users.add(new User(user));
+        }
+
+        return users;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#list(org.wamblee.usermgt.Group)
+     */
+    public Set<User> list(Group aGroup) {
+        Set<User> users = new TreeSet<User>();
+        TypedQuery<User> query = entityManager.createNamedQuery(
+            User.QUERY_FIND_BY_GROUP_NAME, User.class);
+        query.setParameter(User.NAME_PARAM, aGroup.getName());
+        
+        List<User> list = query.getResultList();
+
+        for (User user : list) {
+            setPasswordInfo(user);
+            users.add(new User(user));
+        }
+
+        return users;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.usermgt.UserSet#size()
+     */
+    public int size() {
+        Long result = entityManager.createNamedQuery(User.QUERY_COUNT_USERS, Long.class).getSingleResult();
+        return result.intValue();
+    }
+}