diff -r 26b065bb4ee7 -r 8cc5b440fdde src/share/classes/com/sun/tools/javac/jvm/Gen.java
--- a/src/share/classes/com/sun/tools/javac/jvm/Gen.java	Mon Apr 04 19:36:26 2011 +0100
+++ b/src/share/classes/com/sun/tools/javac/jvm/Gen.java	Wed Apr 06 19:30:57 2011 -0700
@@ -1456,7 +1456,7 @@
                       List<Integer> gaps) {
             if (startpc != endpc) {
                 List<JCExpression> subClauses = TreeInfo.isMultiCatch(tree) ?
-                        ((JCTypeDisjunction)tree.param.vartype).alternatives :
+                        ((JCTypeUnion)tree.param.vartype).alternatives :
                         List.of(tree.param.vartype);
                 while (gaps.nonEmpty()) {
                     for (JCExpression subCatch : subClauses) {