HADOOP-8501. Gridmix fails to compile on OpenJDK7u4 (Radim Kolar via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1349441 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -68,6 +68,9 @@ Release 0.23.3 - UNRELEASED
     HADOOP-8317. Update maven-assembly-plugin to 2.3 - fix build on FreeBSD
     (Radim Kolar via bobby)
 
+    HADOOP-8501. Gridmix fails to compile on OpenJDK7u4 
+    (Radim Kolar via tgraves)
+
 Release 0.23.2 - UNRELEASED 
 
   NEW FEATURES

hadoop-tools/hadoop-gridmix/src/main/java/org/apache/hadoop/mapred/gridmix/Gridmix.java

@@ -609,10 +609,10 @@ public class Gridmix extends Configured implements Tool {
     }
   }
 
-  private <T> String getEnumValues(Enum<? extends T>[] e) {
+  private String getEnumValues(Enum<?>[] e) {
     StringBuilder sb = new StringBuilder();
     String sep = "";
-    for (Enum<? extends T> v : e) {
+    for (Enum<?> v : e) {
       sb.append(sep);
       sb.append(v.name());
       sep = "|";