diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
new file mode 100644
index 0000000..a6f2106
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
@@ -0,0 +1,71 @@
+package org.projectfloodlight.openflow.types;
+
+import javax.annotation.concurrent.Immutable;
+
+import com.google.common.primitives.UnsignedInts;
+
+@Immutable
+public class ClassId implements OFValueType<ClassId> {
+    static final int LENGTH = 4;
+
+    private final static int NONE_VAL = 0;
+    public final static ClassId NONE = new ClassId(NONE_VAL);
+
+    private final int rawValue;
+
+    private ClassId(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static ClassId of(final int raw) {
+        if(raw == NONE_VAL)
+            return NONE;
+
+        return new ClassId(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    @Override
+    public ClassId applyMask(ClassId mask) {
+        return ClassId.of(rawValue & mask.rawValue);    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + rawValue;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        ClassId other = (ClassId) obj;
+        if (rawValue != other.rawValue)
+            return false;
+        return true;
+    }
+
+    @Override
+    public int compareTo(ClassId o) {
+        return UnsignedInts.compare(rawValue, rawValue);
+    }
+}