graph - 尝试提交事务时，Jena 的 TDB 数据集出现 TDBTransactionException

Question

这是我写的:

public static void main(String[] args) {
    Dataset dataset = TDBFactory.createDataset("/tmp/someThings");
    dataset.begin(ReadWrite.WRITE);
    Model model = dataset.getDefaultModel();
    model.setNsPrefix("kg", "http://sankuai.com/kg");
    Resource resource = model.createResource("http://sankuai.com/kg/jena");
    resource.addProperty(model.createProperty("kg", "language"), "SPARQL");
    dataset.commit();
    System.out.println(model);
}

而是给我一些输出，它显示错误:

Exception in thread "main" org.apache.jena.tdb.transaction.TDBTransactionException: Not in a transaction

我做错了什么吗？

Answer 1

问题是当我检索模型时:

System.out.println(model);

它必须包含在交易中，我不是...