Merge into master from pull request #396:
add isMulticast() in IPAddress (https://github.com/floodlight/loxigen/pull/396)
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFGroup.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFGroup.java
index 32e9bcc..9c571ea 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFGroup.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFGroup.java
@@ -38,7 +38,7 @@
     public final static OFGroup ANY = new NamedGroup(ANY_VAL, "any");
 
     /** group 0 in case we need it */
-    public static final OFGroup ZERO = OFGroup.of(ZERO_VAL);
+    public static final OFGroup ZERO = new OFGroup(ZERO_VAL);
 
     public static final OFGroup NO_MASK = ANY;
     public static final OFGroup FULL_MASK = ZERO;
@@ -62,7 +62,7 @@
     public static OFGroup of(final int groupNumber) {
         switch(groupNumber) {
             case ZERO_VAL:
-                return MAX;
+                return ZERO;
             case MAX_VAL:
                 return MAX;
             case ALL_VAL: