hugegraph-spark-connector/src/main/java/org/apache/hugegraph/spark/connector/builder/VertexBuilder.java [65:82]:
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    private void checkIdField() {
        String name = this.vertexLabel.name();
        if (this.vertexLabel.idStrategy().isCustomize()) {
            E.checkState(this.mapping.idField() != null,
                         "The id field can't be empty or null when " +
                         "id strategy is '%s' for vertex label '%s'",
                         this.vertexLabel.idStrategy(), name);
        } else if (this.vertexLabel.idStrategy().isPrimaryKey()) {
            E.checkState(this.mapping.idField() == null,
                         "The id field must be empty or null when " +
                         "id strategy is '%s' for vertex label '%s'",
                         this.vertexLabel.idStrategy(), name);
        } else {
            // The id strategy is automatic
            throw new IllegalArgumentException("Unsupported AUTOMATIC id strategy for " +
                                               "hugegraph Spark Connector.");
        }
    }
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hugegraph-loader/src/main/java/org/apache/hugegraph/loader/builder/VertexBuilder.java [90:107]:
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    private void checkIdField() {
        String name = this.vertexLabel.name();
        if (this.vertexLabel.idStrategy().isCustomize()) {
            E.checkState(this.mapping.idField() != null,
                         "The id field can't be empty or null when " +
                         "id strategy is '%s' for vertex label '%s'",
                         this.vertexLabel.idStrategy(), name);
        } else if (this.vertexLabel.idStrategy().isPrimaryKey()) {
            E.checkState(this.mapping.idField() == null,
                         "The id field must be empty or null when " +
                         "id strategy is '%s' for vertex label '%s'",
                         this.vertexLabel.idStrategy(), name);
        } else {
            // The id strategy is automatic
            throw new IllegalArgumentException("Unsupported AUTOMATIC id strategy for " +
                                               "hugegraph-loader");
        }
    }
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