diff --git a/src/java/org/apache/commons/graph/domain/dependency/exception/CircularDependencyException.java b/src/java/org/apache/commons/graph/domain/dependency/exception/CircularDependencyException.java
new file mode 100644
index 0000000..dc7e077
--- /dev/null
+++ b/src/java/org/apache/commons/graph/domain/dependency/exception/CircularDependencyException.java
@@ -0,0 +1,38 @@
+package org.apache.commons.graph.dependency.exception;
+
+import org.apache.commons.graph.exception.*;
+
+/**
+ * Description of the Class
+ */
+public class CircularDependencyException
+     extends CycleException
+{
+    /**
+     * Constructor for the CircularDependencyException object
+     */
+    public CircularDependencyException()
+    {
+        super();
+    }
+
+    /**
+     * Constructor for the CircularDependencyException object
+     *
+     * @param msg
+     */
+    public CircularDependencyException(String msg)
+    {
+        super(msg);
+    }
+
+    /**
+     * Constructor for the CircularDependencyException object
+     *
+     * @param cause
+     */
+    public CircularDependencyException(Throwable cause)
+    {
+        super(cause);
+    }
+}
diff --git a/src/java/org/apache/commons/graph/domain/statemachine/exception/StateMachineException.java b/src/java/org/apache/commons/graph/domain/statemachine/exception/StateMachineException.java
new file mode 100644
index 0000000..83a3263
--- /dev/null
+++ b/src/java/org/apache/commons/graph/domain/statemachine/exception/StateMachineException.java
@@ -0,0 +1,38 @@
+package org.apache.commons.graph.statemachine.exception;
+
+import org.apache.commons.graph.exception.*;
+
+/**
+ * Description of the Class
+ */
+public class StateMachineException
+     extends GraphException
+{
+    /**
+     * Constructor for the StateMachineException object
+     */
+    public StateMachineException()
+    {
+        super();
+    }
+
+    /**
+     * Constructor for the StateMachineException object
+     *
+     * @param msg
+     */
+    public StateMachineException(String msg)
+    {
+        super(msg);
+    }
+
+    /**
+     * Constructor for the StateMachineException object
+     *
+     * @param t
+     */
+    public StateMachineException(Throwable t)
+    {
+        super(t);
+    }
+}
diff --git a/src/java/org/apache/commons/graph/domain/uml/exception/ModelNotFoundException.java b/src/java/org/apache/commons/graph/domain/uml/exception/ModelNotFoundException.java
new file mode 100644
index 0000000..49bf581
--- /dev/null
+++ b/src/java/org/apache/commons/graph/domain/uml/exception/ModelNotFoundException.java
@@ -0,0 +1,38 @@
+package org.apache.commons.graph.domain.uml.exception;
+
+/**
+ * Description of the Class
+ */
+public class ModelNotFoundException extends Exception
+{
+    private Throwable cause = null;
+
+    /**
+     * Constructor for the ModelNotFoundException object
+     */
+    public ModelNotFoundException()
+    {
+        super();
+    }
+
+    /**
+     * Constructor for the ModelNotFoundException object
+     *
+     * @param msg
+     */
+    public ModelNotFoundException(String msg)
+    {
+        super(msg);
+    }
+
+    /**
+     * Constructor for the ModelNotFoundException object
+     *
+     * @param cause
+     */
+    public ModelNotFoundException(Throwable cause)
+    {
+        super(cause.getMessage());
+        this.cause = cause;
+    }
+}