Index: src/main/java/org/drools/common/ObjectTypeConfigurationRegistry.java
===================================================================
--- src/main/java/org/drools/common/ObjectTypeConfigurationRegistry.java	(revision 32708)
+++ src/main/java/org/drools/common/ObjectTypeConfigurationRegistry.java	(working copy)
@@ -4,6 +4,7 @@
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.drools.facttemplates.Fact;
 import org.drools.reteoo.ClassObjectTypeConf;
@@ -20,7 +21,7 @@
     public ObjectTypeConfigurationRegistry(InternalRuleBase ruleBase ) {
         super();
         this.ruleBase = ruleBase;
-        this.typeConfMap = new HashMap<Object, ObjectTypeConf>();
+        this.typeConfMap = new ConcurrentHashMap<Object, ObjectTypeConf>();
     }
 
 
Index: src/main/java/org/drools/reteoo/EntryPointNode.java
===================================================================
--- src/main/java/org/drools/reteoo/EntryPointNode.java	(revision 32708)
+++ src/main/java/org/drools/reteoo/EntryPointNode.java	(working copy)
@@ -24,6 +24,7 @@
 import java.io.ObjectOutput;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.drools.base.ShadowProxy;
 import org.drools.common.BaseNode;
@@ -102,7 +103,7 @@
                objectSource,
                999 ); // irrelevant for this node, since it overrides sink management
         this.entryPoint = entryPoint;
-        this.objectTypeNodes = new HashMap<ObjectType, ObjectTypeNode>();
+        this.objectTypeNodes = new ConcurrentHashMap<ObjectType, ObjectTypeNode>();
     }
 
     // ------------------------------------------------------------
Index: src/main/java/org/drools/base/ClassFieldAccessorCache.java
===================================================================
--- src/main/java/org/drools/base/ClassFieldAccessorCache.java	(revision 32708)
+++ src/main/java/org/drools/base/ClassFieldAccessorCache.java	(working copy)
@@ -4,6 +4,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.WeakHashMap;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.drools.RuntimeDroolsException;
 import org.drools.util.asm.ClassFieldInspector;
@@ -290,12 +291,12 @@
 
     public static class CacheEntry {
         private ByteArrayClassLoader                         byteArrayClassLoader;
-        private final Map<AccessorKey, BaseClassFieldReader> readCache   = new HashMap<AccessorKey, BaseClassFieldReader>();
-        private final Map<AccessorKey, BaseClassFieldWriter> writeCache  = new HashMap<AccessorKey, BaseClassFieldWriter>();
+        private final Map<AccessorKey, BaseClassFieldReader> readCache   = new ConcurrentHashMap<AccessorKey, BaseClassFieldReader>();
+        private final Map<AccessorKey, BaseClassFieldWriter> writeCache  = new ConcurrentHashMap<AccessorKey, BaseClassFieldWriter>();
 
-        private final Map<Class< ? >, ClassFieldInspector>   inspectors  = new HashMap<Class< ? >, ClassFieldInspector>();
+        private final Map<Class< ? >, ClassFieldInspector>   inspectors  = new ConcurrentHashMap<Class< ? >, ClassFieldInspector>();
 
-        private final Map<ClassObjectTypeKey, ClassObjectType>       objectTypes = new HashMap<ClassObjectTypeKey, ClassObjectType>();
+        private final Map<ClassObjectTypeKey, ClassObjectType>       objectTypes = new ConcurrentHashMap<ClassObjectTypeKey, ClassObjectType>();
 
         public CacheEntry(ClassLoader parentClassLoader) {
             if ( parentClassLoader == null ) {