diff --git a/source/java/org/alfresco/repo/cache/EhCacheAdapter.java b/source/java/org/alfresco/repo/cache/EhCacheAdapter.java
index 41fac6a08d..f1bf82f816 100644
--- a/source/java/org/alfresco/repo/cache/EhCacheAdapter.java
+++ b/source/java/org/alfresco/repo/cache/EhCacheAdapter.java
@@ -44,7 +44,7 @@ import org.alfresco.error.AlfrescoRuntimeException;
  * 
  * @author Derek Hulley
  */
-public class EhCacheAdapter<K extends Serializable, V extends Serializable>
+public class EhCacheAdapter<K extends Serializable, V extends Object>
         implements SimpleCache<K, V>
 {
     private net.sf.ehcache.Cache cache;
diff --git a/source/java/org/alfresco/repo/cache/NullCache.java b/source/java/org/alfresco/repo/cache/NullCache.java
index 22355f45fd..cf504716c1 100644
--- a/source/java/org/alfresco/repo/cache/NullCache.java
+++ b/source/java/org/alfresco/repo/cache/NullCache.java
@@ -37,7 +37,7 @@ import java.util.Collections;
  * 
  * @author Derek Hulley
  */
-public class NullCache<K extends Serializable, V extends Serializable> implements SimpleCache<K, V>
+public class NullCache<K extends Serializable, V extends Object> implements SimpleCache<K, V>
 {
     public NullCache()
     {
diff --git a/source/java/org/alfresco/repo/cache/SimpleCache.java b/source/java/org/alfresco/repo/cache/SimpleCache.java
index 299223881d..9b89701628 100644
--- a/source/java/org/alfresco/repo/cache/SimpleCache.java
+++ b/source/java/org/alfresco/repo/cache/SimpleCache.java
@@ -37,7 +37,7 @@ import java.util.Collection;
  * 
  * @author Derek Hulley
  */
-public interface SimpleCache<K extends Serializable, V extends Serializable>
+public interface SimpleCache<K extends Serializable, V extends Object>
 {
     public boolean contains(K key);
     
diff --git a/source/java/org/alfresco/repo/cache/TransactionalCache.java b/source/java/org/alfresco/repo/cache/TransactionalCache.java
index 45bd774373..1e9e8629a6 100644
--- a/source/java/org/alfresco/repo/cache/TransactionalCache.java
+++ b/source/java/org/alfresco/repo/cache/TransactionalCache.java
@@ -73,7 +73,7 @@ import org.springframework.util.Assert;
  * 
  * @author Derek Hulley
  */
-public class TransactionalCache<K extends Serializable, V extends Serializable>
+public class TransactionalCache<K extends Serializable, V extends Object>
         implements SimpleCache<K, V>, TransactionListener, InitializingBean
 {
     private static final String RESOURCE_KEY_TXN_DATA = "TransactionalCache.TxnData"; 
@@ -85,7 +85,7 @@ public class TransactionalCache<K extends Serializable, V extends Serializable>
     private String name;
     
     /** the shared cache that will get updated after commits */
-    private SimpleCache<Serializable, Serializable> sharedCache;
+    private SimpleCache<Serializable, Object> sharedCache;
 
     /** the manager to control Ehcache caches */
     private CacheManager cacheManager;
@@ -133,7 +133,7 @@ public class TransactionalCache<K extends Serializable, V extends Serializable>
      * 
      * @param sharedCache
      */
-    public void setSharedCache(SimpleCache<Serializable, Serializable> sharedCache)
+    public void setSharedCache(SimpleCache<Serializable, Object> sharedCache)
     {
         this.sharedCache = sharedCache;
     }