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diff --git a/bundles/org.simantics.databoard/scratch/org/simantics/databoard/tests/Jotakin18.java b/bundles/org.simantics.databoard/scratch/org/simantics/databoard/tests/Jotakin18.java
new file mode 100644
index 000000000..20502f0db
--- /dev/null
+++ b/bundles/org.simantics.databoard/scratch/org/simantics/databoard/tests/Jotakin18.java
@@ -0,0 +1,139 @@
+package org.simantics.databoard.tests;
+
+import java.io.IOException;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.Datatypes;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.LongBinding;
+import org.simantics.databoard.binding.error.BindingConstructionException;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.databoard.binding.reflection.BindingRequest;
+import org.simantics.databoard.binding.reflection.BindingProvider;
+import org.simantics.databoard.binding.reflection.ClassBindingFactory;
+import org.simantics.databoard.serialization.Serializer;
+import org.simantics.databoard.serialization.SerializerConstructionException;
+
+public class Jotakin18 {
+
+	public static class MyLongBindingFactory implements BindingProvider {
+		
+		MyLongBinding myLongBinding = new MyLongBinding();
+
+		public Binding provideBinding(ClassBindingFactory master, BindingRequest request) throws BindingConstructionException {
+			if (MyLong.class.isAssignableFrom( request.getClazz() )) {
+				return myLongBinding;
+			}
+			
+			return null;
+		}	
+
+	}
+	
+	public static class MyLongBinding extends LongBinding {
+		
+	    public MyLongBinding() {
+	        super(Datatypes.LONG);
+	    }
+	    
+	    @Override
+	    public Object create(long value) throws BindingException {
+	    	MyLong x = new MyLong();
+	    	x.setValue(value);
+	    	return x;
+	    }
+
+	    @Override
+	    public Object create(Long value) throws BindingException {
+	    	MyLong x = new MyLong();
+	    	x.setValue(value);
+	    	return x;
+	    }
+
+	    @Override
+	    public Object create(Number value) throws BindingException {
+	    	MyLong x = new MyLong();
+	    	x.setValue(value.longValue());
+	    	return x;
+	    }
+
+	    @Override
+	    public Object create(String value) throws BindingException {
+	    	MyLong x = new MyLong();
+	    	x.setValue(Long.valueOf(value));
+	    	return x;
+	    }
+
+	    @Override
+	    public Long getValue(Object o) throws BindingException {
+	    	MyLong x = (MyLong) o;
+	    	return x.getValue();
+	    }
+
+	    @Override
+	    public long getValue_(Object o) throws BindingException {
+	    	MyLong x = (MyLong) o;
+	    	return x.getValue();
+	    }
+
+	    @Override
+	    public void setValue(Object obj, Number value) throws BindingException {
+	        throw new BindingException("Resource is immutable");
+	    }
+
+	    @Override
+	    public void setValue(Object obj, long value) throws BindingException {
+	        throw new BindingException("Resource is immutable");
+	    }
+	    
+	    @Override
+	    public boolean isImmutable() {
+	    	return true;
+	    }
+
+	    @Override
+	    public boolean isInstance(Object obj) {
+	        return obj instanceof MyLong;
+	    }
+	}
+	
+	public static class XXX {
+		
+		public MyLong x; 
+		public long z;
+		private long y;
+
+		public long getY() {
+			return y;
+		}
+		public void setY(long y) {
+			this.y = y;
+		}
+	}
+
+	public static class MyLong {		
+		private long value;
+		public long getValue() {
+			return value;
+		}
+		public void setValue(long value) {
+			this.value = value;
+		}		
+	}
+	
+	public static void main(String[] args) throws SerializerConstructionException, BindingConstructionException, IOException {
+		
+		Bindings.databoard.addBindingFactory( new MyLongBindingFactory() );
+		
+		XXX x = new XXX();
+		x.x = new MyLong();
+		
+		Binding b = Bindings.databoard.getBinding(XXX.class);
+		Serializer s = Bindings.getSerializer(b);
+		
+		byte[] data = s.serialize(x);
+		s.deserialize(data);
+		
+	}
+	
+}