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/metrics/MetricsManager.java b/utils/misc/src/main/java/org/onlab/metrics/MetricsManager.java
index 2dd31aa..5fe22f7 100644
--- a/utils/misc/src/main/java/org/onlab/metrics/MetricsManager.java
+++ b/utils/misc/src/main/java/org/onlab/metrics/MetricsManager.java
@@ -49,8 +49,8 @@
  * this class, but are allocated by the caller and passed in for registration:
  * <pre>
  *   <code>
- *     private final Gauge<Long> gauge =
- *         new {@literal Gauge<Long>}() {
+ *     private final Gauge&lt;Long&gt; gauge =
+ *         new {@literal Gauge&lt;Long&gt}() {
  *             {@literal @}Override
  *             public Long getValue() {
  *                 return gaugeValue;