Retain last component in rendererPane. Testcase added

test/jdk/javax/swing/plaf/basic/BasicTreeUI/TreeCellRendererLeakTest.java

@@ -24,7 +24,7 @@
 /*
  * @test
  * @bug 6507038
- * @summary Verifies memory leak in BasicTreeUI TreeCellRenderer 
+ * @summary Verifies memory leak in BasicTreeUI TreeCellRenderer
  * @run main TreeCellRendererLeakTest
  */
 
@@ -42,35 +42,34 @@
 import javax.swing.tree.TreeNode;
 
 public class TreeCellRendererLeakTest {
-    
+
     static long smCount = 0;
-    static boolean done;    
+    static boolean done;
 
     private static JFrame frame;
     private JPanel jPanel1;
     private JPanel jPanel2;
     private JScrollPane jScrollPane1;
     private JTabbedPane jTabbedPane1;
     private JTree jTree1;
-    // End of variables declaration
-
+
     // JLabel with an instance counter
     public class TestLabel extends JLabel {
         public TestLabel() {
             smCount++;
         }
-        
+
         public void finalize( ) {
             smCount--;
         }
     }
-    
+
     // Custom TreeCellRenderer
     public class TreeCellRenderer extends DefaultTreeCellRenderer {
-        
+
         public TreeCellRenderer( ) {
         }
-        
+
         // Create a new JLabel every time
         public Component getTreeCellRendererComponent(
                 JTree tree,
@@ -87,11 +86,11 @@ public Component getTreeCellRendererComponent(
             } else {
                 label.setBackground(getBackgroundNonSelectionColor());
             }
-            
+
             return label;
         }
     }
-    
+
     public TreeCellRendererLeakTest() {
         initComponents();
         jTree1.setCellRenderer(new TreeCellRenderer());
@@ -110,7 +109,7 @@ public void run( ) {
         infoThread.setDaemon(true);
         infoThread.start();
     }
-    
+
     // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
     private void initComponents() {
         jTabbedPane1 = new javax.swing.JTabbedPane();
@@ -140,7 +139,7 @@ private void initComponents() {
         frame.setLocationRelativeTo(null);
         frame.setVisible(true);
     }// </editor-fold>
-    
+
     public static void main(String args[]) throws Exception {
         try {
             SwingUtilities.invokeAndWait(() -> {
@@ -155,9 +154,9 @@ public static void main(String args[]) throws Exception {
                     frame.dispose();
                 }
             });
-        } 
+        }
     }
-    
+
     // Periodically cause a nodeChanged() for one of the nodes
     public void runChanges() {
         long count = 0;
@@ -185,7 +184,7 @@ public void run( ) {
         }
         done = true;
     }
-    
+
     // Print number of uncollected TestLabels
     public void runInfo( ) {
         long time = System.currentTimeMillis();
@@ -203,5 +202,5 @@ public void runInfo( ) {
             throw new RuntimeException("TreeCellRenderer component leaked");
         }
     }
-    
+
 }