@Override
    public void vertexPropertyPropertyChanged(final VertexProperty element, final Property oldValue, final Object setValue) {
        System.out.println("VertexProperty [" + element.toString() + "] property change value from [" + oldValue + "] to [" + setValue + "] in graph [" + graph.toString() + "]");
    }
An example listener that writes a message to the console for each event that fires from the graph.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/ConsoleMutationListener.java