--- a/java.hints/src/org/netbeans/modules/java/hints/errors/Utilities.java	Wed Aug 06 10:54:57 2008 +0530
+++ a/java.hints/src/org/netbeans/modules/java/hints/errors/Utilities.java	Wed Aug 06 11:07:23 2008 +0530
@@ -99,10 +99,15 @@ 
         String name = getName(et);
         
         if (name == null) {
-            if(et instanceof LiteralTree) {
-                String guess = (String) ((LiteralTree) et).getValue();
-                if (guess != null)
+            if (et instanceof LiteralTree) {
+                LiteralTree literalTree= (LiteralTree) et;
+                 //142405 check is LiteralTree.getValue() String before cast
+                if (literalTree.getValue() instanceof String) {
+                    String guess = (String) literalTree.getValue();
                     return guessLiteralName(guess);
+                } else {
+                     return DEFAULT_NAME;
+                }
             } else
                 return DEFAULT_NAME;
         }