HADOOP-8329. Build fails with Java 7. Contributed by Eli Collins

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1340269 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -43,6 +43,8 @@ Release 2.0.1-alpha - UNRELEASED
     HADOOP-8408. MR doesn't work with a non-default ViewFS mount table
     and security enabled. (atm via eli)
 
+    HADOOP-8329. Build fails with Java 7. (eli)
+
 Release 2.0.0-alpha - UNRELEASED
 
   INCOMPATIBLE CHANGES

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 = "|";