javeme commented on issue #1918:
URL:
https://github.com/apache/incubator-hugegraph/issues/1918#issuecomment-1174732833
如果VertexLabel使用了`primaryKeys`的Id策略，依然报错“Expect source vertex
id”，那应该还是`fastjson`的版本冲突导致，请尝试通过命令`mvn dependency:tree`查看具体冲突版本，并更换其它兼容版本试试。
注意：如果VertexLabel没有使用`primaryKeys`的Id策略，需要接收addVertex返回值然后把Vertex-Id赋值给Edge的sourceId：
```java
v1 = graph.addVertex(v1)
v2 = graph.addVertex(v2)
Edge edge = new Edge("xx").source(v1).target(v2);
```
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