Fixed some javadoc warning/errors.
Fixed NPE error in objective tracker.
Preparing for upgrade to Java 8 and Karaf 3.0.2.
diff --git a/utils/misc/src/main/java/org/onlab/graph/Heap.java b/utils/misc/src/main/java/org/onlab/graph/Heap.java
index 3b2f539..ebb1a60 100644
--- a/utils/misc/src/main/java/org/onlab/graph/Heap.java
+++ b/utils/misc/src/main/java/org/onlab/graph/Heap.java
@@ -28,14 +28,16 @@
/**
* Implementation of an array-backed heap structure whose sense of order is
* imposed by the provided comparator.
- * <p/>
+ * <p>
* While this provides similar functionality to {@link java.util.PriorityQueue}
* data structure, one key difference is that external entities can control
* when to restore the heap property, which is done through invocation of the
* {@link #heapify} method.
- * <p/>
+ * </p>
+ * <p>
* This class is not thread-safe and care must be taken to prevent concurrent
* modifications.
+ * </p>
*
* @param <T> type of the items on the heap
*/