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diff --git a/security/impl/src/main/java/org/wamblee/security/AbstractPersistent.java b/security/impl/src/main/java/org/wamblee/security/AbstractPersistent.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.security;
+
+import java.io.Serializable;
+
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Version;
+
+import org.wamblee.persistence.Persistent;
+
+/**
+ * Default implementation of Persistent.
+ * 
+ * @author Erik Brakkee
+ */
+public abstract class AbstractPersistent implements Persistent {
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long primaryKey;
+
+    @Version
+    private int version;
+
+    protected AbstractPersistent() {
+        primaryKey = null;
+        version = -1;
+    }
+
+    /**
+     * Copy constructor.
+     * 
+     * @param aPersistent
+     *            Object to copy.
+     */
+    protected AbstractPersistent(AbstractPersistent aPersistent) {
+        primaryKey = aPersistent.primaryKey;
+        version = aPersistent.version;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.persistence.Persistent#getPrimaryKey()
+     */
+    @Override
+    public Long getPrimaryKey() {
+        return primaryKey;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see
+     * org.wamblee.persistence.Persistent#setPrimaryKey(java.io.Serializable)
+     */
+    @Override
+    public void setPrimaryKey(Long aKey) {
+        primaryKey = aKey;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.persistence.Persistent#getPersistedVersion()
+     */
+    public int getPersistedVersion() {
+        return version;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.persistence.Persistent#setPersistedVersion(int)
+     */
+    public void setPersistedVersion(int aVersion) {
+        version = aVersion;
+    }
+}