pick up the change from REEF-293, PR 167 for Null Point Exception issues on Mesos
diff --git a/lang/java/reef-runtime-mesos/src/main/java/org/apache/reef/runtime/mesos/driver/REEFScheduler.java b/lang/java/reef-runtime-mesos/src/main/java/org/apache/reef/runtime/mesos/driver/REEFScheduler.java
index ba11aae..1b94182 100644
--- a/lang/java/reef-runtime-mesos/src/main/java/org/apache/reef/runtime/mesos/driver/REEFScheduler.java
+++ b/lang/java/reef-runtime-mesos/src/main/java/org/apache/reef/runtime/mesos/driver/REEFScheduler.java
@@ -384,6 +384,7 @@
         .setIdentifier(taskStatus.getTaskId().getValue())
         .setNodeId(taskStatus.getSlaveId().getValue())
         .setResourceMemory(resourceRequestProto.getMemorySize().get())
+        .setVirtualCores(resourceRequestProto.getVirtualCores().get())
         .build();
     reefEventHandlers.onResourceAllocation(alloc);