toString methods are overrided for ICMPv4Code and ICMPv4Type
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ICMPv4Type.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ICMPv4Type.java
index a0aa152..634bc03 100644
--- a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ICMPv4Type.java
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ICMPv4Type.java
@@ -200,4 +200,8 @@
         sink.putShort(type);
     }
 
+    @Override
+    public String toString() {
+        return String.valueOf(this.type);
+    }
 }