>
&nbsp;        }});
<b class="fc">&nbsp;        personVertexLabel.ensureEdgeLabelExist(&quot;knows&quot;, personVertexLabel, new HashMap&lt;&gt;() {{</b>
<b class="fc">&nbsp;            put(&quot;uuid&quot;, PropertyDefinition.of(PropertyType.UUID));</b>
&nbsp;        }});
<b class="fc">&nbsp;        this.sqlgGraph.tx().commit();</b>
&nbsp;
<b class="fc">&nbsp;        VertexLabel vertexLabel = this.sqlgGraph.getTopology().getPublicSchema().getVertexLabel(&quot;Person&quot;).orElseThrow();</b>
<b class="fc"