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diff --git a/docs/teaching/exercises/figures/SlothfulPoint.java b/docs/teaching/exercises/figures/SlothfulPoint.java
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+++ b/docs/teaching/exercises/figures/SlothfulPoint.java
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+/* *******************************************************************
+ * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
+ * All rights reserved. 
+ * This program and the accompanying materials are made available 
+ * under the terms of the Common Public License v1.0 
+ * which accompanies this distribution and is available at 
+ * http://www.eclipse.org/legal/cpl-v10.html 
+ *  
+ * Contributors: 
+ *     PARC     initial implementation 
+ * ******************************************************************/
+
+
+package figures;
+
+import java.awt.*;
+import java.awt.geom.*;
+
+/**
+ * This class makes mistakes to be caught by invariant checkers.
+ */
+public class SlothfulPoint extends ShapeFigureElement {
+    private int _x;
+    private int _y;
+
+    public SlothfulPoint(int x, int y) {
+    }
+
+    public int getX() { return _x; }
+
+    public int getY() { return _y; }
+
+    public void setX(int x) { }
+
+    public void setY(int y) { }
+
+    public void move(int dx, int dy) {
+	System.out.println("Slothful moving");
+    }
+
+    public String toString() {
+        return "SlothfulPoint";
+    }
+
+    public Shape getShape() {
+	return new Ellipse2D.Float((float)_x,
+                                   (float)_y, 1.0f, 1.0f);
+    }
+}
+