@Override
    public void writeVertexProperty(final OutputStream outputStream, final VertexProperty vp) throws IOException {
        mapper.writeValue(outputStream, vp);
    }
Write a {@link VertexProperty} object to the stream.

@param outputStream the stream to write to.
@param vp the vertex property to write.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONWriter.java