6359971: Threads tab: Simple text to explain that one can click on a thread to get stack trace

Reviewed-by: alanb, jbachorik

src/share/classes/sun/tools/jconsole/Messages.java

@@ -271,6 +271,7 @@ final public class Messages {
     public static String THREADS;
     public static String THREAD_TAB_THREAD_INFO_ACCESSIBLE_NAME;
     public static String THREAD_TAB_THREAD_PLOTTER_ACCESSIBLE_NAME;
+    public static String THREAD_TAB_INITIAL_STACK_TRACE_MESSAGE;
     public static String THRESHOLD;
     public static String TILE;
     public static String TIME_RANGE_COLON;

src/share/classes/sun/tools/jconsole/ThreadTab.java

@@ -596,6 +596,7 @@ class ThreadTab extends Tab implements ActionListener, DocumentListener, ListSel
             setBorder(thinEmptyBorder);
 
             setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
+            textArea.setText(Messages.THREAD_TAB_INITIAL_STACK_TRACE_MESSAGE);
             addListSelectionListener(ThreadTab.this);
             setCellRenderer(new DefaultListCellRenderer() {
                 public Component getListCellRendererComponent(JList<?> list, Object value, int index,

src/share/classes/sun/tools/jconsole/resources/messages.properties

@@ -229,6 +229,7 @@ SUMMARY_TAB_VM_VERSION={0} version {1}
 THREADS=Threads
 THREAD_TAB_THREAD_INFO_ACCESSIBLE_NAME=Thread Information
 THREAD_TAB_THREAD_PLOTTER_ACCESSIBLE_NAME=Chart for number of threads.
+THREAD_TAB_INITIAL_STACK_TRACE_MESSAGE=[No thread selected]
 THRESHOLD=Threshold
 TILE=&Tile
 TIME_RANGE_COLON=&Time Range: