Jena TDB java.lang.ExceptionInInitializerError

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问题描述

我正在使用Jena TDB加载RDF数据集并对其进行SPARQL查询。我正在使用以下maven依赖：

I'm using Jena TDB for loading an RDF dataset and making SPARQL queries against it. I'm using the following maven dependency:

<dependency>
    <groupId>org.apache.jena</groupId>
    <artifactId>apache-jena-libs</artifactId>
    <type>pom</type>
    <version>3.0.1</version>
</dependency>

这里是我试图创建TDB数据集的java代码：

And here's the java code where I'm trying to create a TDB dataset:

public void loadDirectory(String outputFile){
    Dataset dataset = TDBFactory.createDataset(directoryPath);
    Model tdb = dataset.getDefaultModel();
    FileManager.get().readModel(tdb, outputFile);
    tdb.close();
    dataset.close();
    LOG.info("RDF dataset loaded to memory");
}

它在函数的第一行失败：TDBFactory.createDataset（directoryPath），并出现以下错误消息：

It's failing on the first line of the function: TDBFactory.createDataset( directoryPath ) with the following error message:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at org.sdw.model.JenaModel.loadDirectory(JenaModel.java:69)
    at org.sdw.Main.main(Main.java:75)
Caused by: java.lang.NullPointerException
    at org.apache.jena.tdb.sys.EnvTDB.processGlobalSystemProperties(EnvTDB.java:33)
    at org.apache.jena.tdb.TDB.init(TDB.java:250)
    at org.apache.jena.tdb.sys.InitTDB.start(InitTDB.java:29)
    at org.apache.jena.system.JenaSystem.lambda$init$40(JenaSystem.java:114)
    at java.util.ArrayList.forEach(ArrayList.java:1249)
    at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:179)
    at org.apache.jena.system.JenaSystem.forEach(JenaSystem.java:156)
    at org.apache.jena.system.JenaSystem.init(JenaSystem.java:111)
    at org.apache.jena.tdb.TDBFactory.<clinit>(TDBFactory.java:40)

TDB

Jena TDB java.lang.ExceptionInInitializerError

问题描述

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