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..418ec9f
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/ClassId.java
@@ -0,0 +1,61 @@
+package org.projectfloodlight.openflow.types;
+
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public class ClassId implements OFValueType<ClassId> {
+    static final int LENGTH = 4;
+    private final int rawValue;
+
+    public static final ClassId NO_ClassId = ClassId.of(0xFFFFFFFF);
+    public static final ClassId FULL_MASK = ClassId.of(0x00000000);
+
+    private ClassId(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static ClassId of(final int raw) {
+        return new ClassId(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @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 String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    @Override
+    public ClassId applyMask(ClassId mask) {
+        return ClassId.of(this.rawValue & mask.rawValue);
+    }
+}
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/L2MulticastId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/L2MulticastId.java
new file mode 100644
index 0000000..ff69aed
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/L2MulticastId.java
@@ -0,0 +1,61 @@
+package org.projectfloodlight.openflow.types;
+
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public class L2MulticastId implements OFValueType<L2MulticastId> {
+    static final int LENGTH = 4;
+    private final int rawValue;
+
+    public static final L2MulticastId NO_ClassId = L2MulticastId.of(0xFFFFFFFF);
+    public static final L2MulticastId FULL_MASK = L2MulticastId.of(0x00000000);
+
+    private L2MulticastId(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static L2MulticastId of(final int raw) {
+        return new L2MulticastId(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @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;
+        L2MulticastId other = (L2MulticastId) obj;
+        if (rawValue != other.rawValue)
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    @Override
+    public L2MulticastId applyMask(L2MulticastId mask) {
+        return L2MulticastId.of(this.rawValue & mask.rawValue);
+    }
+}
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/LagId.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/LagId.java
new file mode 100644
index 0000000..76c7011
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/LagId.java
@@ -0,0 +1,70 @@
+package org.projectfloodlight.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public class LagId implements OFValueType<LagId> {
+    static final int LENGTH = 4;
+    private final int rawValue;
+
+    public static final LagId NO_ClassId = LagId.of(0xFFFFFFFF);
+    public static final LagId FULL_MASK = LagId.of(0x00000000);
+
+    private LagId(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static LagId of(final int raw) {
+        return new LagId(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + rawValue;
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        LagId other = (LagId) obj;
+        if (rawValue != other.rawValue)
+            return false;
+        return true;
+    }
+
+    @Override
+    public LagId applyMask(LagId mask) {
+        return LagId.of(this.rawValue & mask.rawValue);
+    }
+
+    public void write4Bytes(ChannelBuffer c) {
+        c.writeInt(rawValue);
+    }
+
+    public static LagId read4Bytes(ChannelBuffer c) {
+        return LagId.of(c.readInt());
+    }
+}
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/PortType.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/PortType.java
new file mode 100644
index 0000000..245c321
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/PortType.java
@@ -0,0 +1,59 @@
+package org.projectfloodlight.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.projectfloodlight.openflow.exceptions.OFParseError;
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public enum PortType implements OFValueType<PortType> {
+    PHYSICA((byte)0),
+    LAG((byte)1);
+
+    private final byte type;
+    static final int LENGTH = 1;
+
+    public static final PortType NO_MASK = PortType.of((byte)0xFF);
+    public static final PortType FULL_MASK = PortType.of((byte)0x00);
+
+    private PortType(byte type) {
+        this.type = type;
+    }
+
+    public static PortType of(byte type) {
+        switch (type) {
+            case 0:
+                return PHYSICA;
+            case 1:
+                return LAG;
+            default:
+                throw new IllegalArgumentException("Illegal Port Type: " + type);
+        }
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toHexString(type);
+    }
+
+    @Override
+    public PortType applyMask(PortType mask) {
+        return PortType.of((byte)(this.type & mask.type));
+    }
+
+    public void writeByte(ChannelBuffer c) {
+        c.writeByte(this.type);
+    }
+
+    public static PortType readByte(ChannelBuffer c) throws OFParseError {
+        return PortType.of((byte)(c.readUnsignedByte()));
+    }
+
+    public byte getPortType() {
+        return type;
+    }
+}
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Priority.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Priority.java
new file mode 100644
index 0000000..5f86cea
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Priority.java
@@ -0,0 +1,61 @@
+package org.projectfloodlight.openflow.types;
+
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public class Priority implements OFValueType<Priority> {
+    static final int LENGTH = 4;
+    private final int rawValue;
+
+    public static final Priority NO_ClassId = Priority.of(0xFFFFFFFF);
+    public static final Priority FULL_MASK = Priority.of(0x00000000);
+
+    private Priority(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static Priority of(final int raw) {
+        return new Priority(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + rawValue;
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Priority other = (Priority) obj;
+        if (rawValue != other.rawValue)
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    @Override
+    public Priority applyMask(Priority mask) {
+        return Priority.of(this.rawValue & mask.rawValue);
+    }
+}
diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/VRF.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/VRF.java
new file mode 100644
index 0000000..641f40a
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/VRF.java
@@ -0,0 +1,70 @@
+package org.projectfloodlight.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.projectfloodlight.openflow.annotations.Immutable;
+
+@Immutable
+public class VRF implements OFValueType<VRF> {
+    static final int LENGTH = 4;
+    private final int rawValue;
+
+    public static final VRF NO_MASK = VRF.of(0xFFFFFFFF);
+    public static final VRF FULL_MASK = VRF.of(0x00000000);
+
+    private VRF(final int rawValue) {
+        this.rawValue = rawValue;
+    }
+
+    public static VRF of(final int raw) {
+        return new VRF(raw);
+    }
+
+    public int getInt() {
+        return rawValue;
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @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;
+        VRF other = (VRF) obj;
+        if (rawValue != other.rawValue)
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(rawValue);
+    }
+
+    public void write4Bytes(ChannelBuffer c) {
+        c.writeInt(rawValue);
+    }
+
+    public static VRF read4Bytes(ChannelBuffer c) {
+        return VRF.of(c.readInt());
+    }
+
+    @Override
+    public VRF applyMask(VRF mask) {
+        return VRF.of(this.rawValue & mask.rawValue);
+    }
+}