尝试使用ArangoDB Java API创建顶点和边缘而不激活批处理模式,一切正常.但是,启用批处理模式时,它会在创建顶点时抛出未知错误.下面是Java代码和异常详细信息.知道为什么会这样吗？提前致谢!

码

public static void main(String[] args) throws ArangoException {

    createNodesInBatch();

}
static public void createNodesInBatch() throws ArangoException {
    ArangoConfigure configure = new ArangoConfigure();
    configure.init();
    ArangoDriver arangoDriver = new ArangoDriver(configure);            

    arangoDriver.createDatabase("small_db"); 
    System.out.println("Database created.");
    arangoDriver.setDefaultDatabase("small_db"); 

    arangoDriver.createCollection("testEdgeCollection",
    new CollectionOptions().setType(CollectionType.EDGE));

    arangoDriver.createCollection("testVertexCollection",
        new CollectionOptions().setType(CollectionType.DOCUMENT));

    EdgeDefinitionEntity ed = new EdgeDefinitionEntity();
    // add edge collection name
    ed.setCollection("testEdgeCollection");

    // add vertex collection names
    ed.getFrom().add("testVertexCollection");

    // add vertex collection names
    ed.getTo().add("testVertexCollection");

    List<EdgeDefinitionEntity> edgeDefinitions = new ArrayList<EdgeDefinitionEntity>();
    edgeDefinitions.add(ed);


    arangoDriver.createGraph("testGraph", edgeDefinitions, null, false);
    System.out.println("Graph created.");

    arangoDriver.startBatchMode();;
    System.out.println("Batch mode …