diff -r 1c999569643b -r acf2c31e22d4 samples/instanceofclass/src-api1.0/api/InstanceProvider.java
--- a/samples/instanceofclass/src-api1.0/api/InstanceProvider.java	Sat Jun 14 10:04:51 2008 +0200
+++ b/samples/instanceofclass/src-api1.0/api/InstanceProvider.java	Sat Jun 14 10:04:53 2008 +0200
@@ -2,18 +2,21 @@
 package api;
 
 // BEGIN: instanceof.class.InstanceProvider1
+
+import java.util.concurrent.Callable;
+
 public final class InstanceProvider {
-    private final Object instance;
+    private final Callable<Object> instance;
 
-    public InstanceProvider(Object instance) {
+    public InstanceProvider(Callable<Object> instance) {
         this.instance = instance;
     }
     
-    public Class<?> instanceClass() {
-        return instance.getClass();
+    public Class<?> instanceClass() throws Exception {
+        return instance.call().getClass();
     }
-    public Object instanceCreate() {
-        return instance;
+    public Object instanceCreate() throws Exception {
+        return instance.call();
     }
 }
 // END: instanceof.class.InstanceProvider1