diff --git a/core/src/main/java/org/springframework/security/core/session/SessionRegistryImpl.java b/core/src/main/java/org/springframework/security/core/session/SessionRegistryImpl.java
index 809eb0c370..e4464bdf45 100644
--- a/core/src/main/java/org/springframework/security/core/session/SessionRegistryImpl.java
+++ b/core/src/main/java/org/springframework/security/core/session/SessionRegistryImpl.java
@@ -48,13 +48,23 @@ public class SessionRegistryImpl implements SessionRegistry,
 	protected final Log logger = LogFactory.getLog(SessionRegistryImpl.class);
 
 	/** <principal:Object,SessionIdSet> */
-	private final ConcurrentMap<Object, Set<String>> principals = new ConcurrentHashMap<Object, Set<String>>();
+	private final ConcurrentMap<Object, Set<String>> principals;
 	/** <sessionId:Object,SessionInformation> */
-	private final Map<String, SessionInformation> sessionIds = new ConcurrentHashMap<String, SessionInformation>();
+	private final Map<String, SessionInformation> sessionIds;
 
 	// ~ Methods
 	// ========================================================================================================
 
+	public SessionRegistryImpl() {
+		this.principals = new ConcurrentHashMap<Object, Set<String>>();
+		this.sessionIds = new ConcurrentHashMap<String, SessionInformation>();
+	}
+
+	public SessionRegistryImpl(ConcurrentMap<Object, Set<String>> principals,Map<String, SessionInformation> sessionIds) {
+		this.principals=principals;
+		this.sessionIds=sessionIds;
+	}
+
 	public List<Object> getAllPrincipals() {
 		return new ArrayList<Object>(principals.keySet());
 	}