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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/TypeCastException.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/TypeCastException.java
new file mode 100644
index 000000000..4f6626eba
--- /dev/null
+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/TypeCastException.java
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.utils.datastructures;
+
+/**
+ * @author Toni Kalajainen
+ */
+public class TypeCastException extends ClassCastException {
+
+    private static final long serialVersionUID = 1L;
+    private Class<?> unsupportedDataType;
+    
+    public TypeCastException(Class<?> unsupportedType) {
+        super("TypeCast Exception, cannot read data type \""+unsupportedType.getName()+"\"");
+        this.unsupportedDataType = unsupportedType;
+    }
+    
+    public TypeCastException(Class<?> unsupportedType, Class<?> expectedType) {
+        super("TypeCast Exception, cannot read data type \""+unsupportedType.getName()+"\", expected type was \""+expectedType.getName()+"\"");
+        this.unsupportedDataType = unsupportedType;
+    }
+    
+    public TypeCastException(String msg) {
+        super(msg);
+        this.unsupportedDataType = null;
+    }
+    
+    public Class<?> getUnsupportedDataType() {
+        return unsupportedDataType;
+    }    
+
+}