--- a/jdk/src/share/classes/sun/tools/jconsole/ThreadTab.java	Mon Aug 19 12:57:17 2013 +0200
+++ b/jdk/src/share/classes/sun/tools/jconsole/ThreadTab.java	Mon Aug 19 16:21:49 2013 +0200
@@ -595,6 +595,7 @@
 
             setBorder(thinEmptyBorder);
 
+            setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
             addListSelectionListener(ThreadTab.this);
             setCellRenderer(new DefaultListCellRenderer() {
                 public Component getListCellRendererComponent(JList<?> list, Object value, int index,