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Index: WizardSetDataAndIteratorTest.java
--- WizardSetDataAndIteratorTest.java Base (BASE)
+++ WizardSetDataAndIteratorTest.java Locally Modified (Based On LOCAL)
@@ -29,6 +29,7 @@
 
 import java.awt.Component;
 import java.io.IOException;
+import java.util.Collections;
 import java.util.Set;
 import javax.swing.JPanel;
 import javax.swing.event.ChangeListener;
@@ -66,6 +67,21 @@
          * */
     }
 
+    public void testInstantiatingIteratorWithStringBuilder() {
+        SbInstantiatingIter it = new SbInstantiatingIter();
+        StringBuilder sb = new StringBuilder();
+        SbWizard w = new SbWizard (it, sb);
+        w.setValue(SbWizard.FINISH_OPTION);
+        assertEquals("Double store", "storeSettings storeSettings ", sb.toString());
+    }
+
+    private static class SbWizard extends WizardDescriptor {
+        public SbWizard(WizardDescriptor.Iterator<StringBuilder> it, StringBuilder sb) {
+            super();
+            setPanelsAndSettings(it, sb);
+        }
+    }
+
     private static class MyWizard extends WizardDescriptor {
         public MyWizard(WizardDescriptor.Iterator<MyWizard> it) {
             super();
@@ -126,7 +142,81 @@
             initializedOnWD = null;
         }
     }
+    private static class SbInstantiatingIter 
+    implements WizardDescriptor.InstantiatingIterator<StringBuilder>,
+    WizardDescriptor.Panel<StringBuilder> {
+        StringBuilder sb;
+        WizardDescriptor initialized;
 
+        public Set instantiate () throws IOException {
+            return Collections.singleton(sb);
+        }
+
+        public void initialize (WizardDescriptor wizard) {
+            initialized = wizard;
+            sb.append("initialize ");
+        }
+
+        public void uninitialize (WizardDescriptor wizard) {
+            initialized = null;
+            sb.append("uninitialize ");
+        }
+
+        public Panel<StringBuilder> current() {
+            return this;
+        }
+
+        public String name() {
+            return "Name";
+        }
+
+        public boolean hasNext() {
+            return false;
+        }
+
+        public boolean hasPrevious() {
+            return false;
+        }
+
+        public void nextPanel() {
+            fail();
+        }
+
+        public void previousPanel() {
+            fail();
+        }
+
+        public void addChangeListener(ChangeListener l) {
+        }
+
+        public void removeChangeListener(ChangeListener l) {
+        }
+
+        public Component getComponent() {
+            sb.append("getComponent ");
+            return new JPanel();
+        }
+
+        public HelpCtx getHelp() {
+            return HelpCtx.DEFAULT_HELP;
+        }
+
+        public void readSettings(StringBuilder settings) {
+            sb = settings;
+            sb.append("readSettings ");
+        }
+
+        public void storeSettings(StringBuilder settings) {
+            settings.setLength(0);
+            sb.append("storeSettings ");
+            settings.append(sb);
+        }
+
+        public boolean isValid() {
+            return true;
+        }
+    }
+
     private static class MyPanel implements WizardDescriptor.Panel<MyWizard> {
         private static MyWizard set;