AMBARI-21723. Redundant type arguments (Java 8)

Author: adoroszlai

ambari-server/src/main/java/com/google/inject/persist/jpa/AmbariJpaPersistModule.java

@@ -69,7 +69,7 @@ public AmbariJpaPersistModule(String jpaUnit) {
     if (null != properties) {
       bind(Properties.class).annotatedWith(Jpa.class).toInstance(properties);
     } else {
-      bind(Properties.class).annotatedWith(Jpa.class).toProvider(Providers.<Properties> of(null));
+      bind(Properties.class).annotatedWith(Jpa.class).toProvider(Providers.of(null));
     }
 
     bind(AmbariJpaPersistService.class).in(Singleton.class);

ambari-server/src/main/java/org/apache/ambari/server/actionmanager/ActionManager.java

@@ -224,7 +224,7 @@ public Map<Long, HostRoleCommand> getTasksMap(Collection<Long> taskIds) {
   public List<Long> getRequestsByStatus(RequestStatus status, int maxResults, boolean ascOrder) {
     List<Long> requests = db.getRequestsByStatus(status, maxResults, ascOrder);
 
-    for (Request logicalRequest : topologyManager.getRequests(Collections.<Long>emptySet())) {
+    for (Request logicalRequest : topologyManager.getRequests(Collections.emptySet())) {
       //todo: Request.getStatus() returns HostRoleStatus and we are comparing to RequestStatus
       //todo: for now just compare the names as RequestStatus names are a subset of HostRoleStatus names
       HostRoleStatus logicalRequestStatus = logicalRequest.getStatus();