使用独立应用程序将数据添加到HTTPRepository时，出现RDF4J RIO UnsupportedRDFormatException

Question

我已经HTTPRepository初始化了一个仓库的URL。我使用RepositoryConnection来检索（天气）数据并将其添加到存储库。从Web服务检索数据，然后将其转换为RDF语句，并将其添加到存储库中。这是由独立应用程序定期完成的。

当我在IntelliJ中运行此应用程序时，一切正常。

为了在服务器上运行此应用程序，我创建了一个jar文件（包含所有依赖项）。该应用程序将按预期启动，并且能够从存储库中检索数据。

但是，当应用程序尝试将数据写入存储库时，我得到了UnsupportedRDFormatException：

org.eclipse.rdf4j.rio.UnsupportedRDFormatException: Did not recognise RDF format object BinaryRDF (mimeTypes=application/x-binary-rdf; ext=brf)
    at org.eclipse.rdf4j.rio.Rio.lambda$unsupportedFormat$0(Rio.java:568) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_111]
    at org.eclipse.rdf4j.rio.Rio.createWriter(Rio.java:134) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.rio.Rio.write(Rio.java:371) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.rio.Rio.write(Rio.java:324) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.addModel(HTTPRepositoryConnection.java:588) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.flushTransactionState(HTTPRepositoryConnection.java:662) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.commit(HTTPRepositoryConnection.java:326) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.conditionalCommit(AbstractRepositoryConnection.java:366) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.add(AbstractRepositoryConnection.java:431) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at nl.wur.fbr.data.weather.WeatherApp.retrieveData(WeatherApp.java:122) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at nl.wur.fbr.data.weather.WeatherData$WeatherTask.run(WeatherData.java:105) [weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at java.util.TimerThread.mainLoop(Timer.java:555) [na:1.8.0_111]
    at java.util.TimerThread.run(Timer.java:505) [na:1.8.0_111]

发生错误的源代码是：

org.eclipse.rdf4j.rio.UnsupportedRDFormatException: Did not recognise RDF format object BinaryRDF (mimeTypes=application/x-binary-rdf; ext=brf)
    at org.eclipse.rdf4j.rio.Rio.lambda$unsupportedFormat$0(Rio.java:568) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at java.util.Optional.orElseThrow(Optional.java:290) ~[na:1.8.0_111]
    at org.eclipse.rdf4j.rio.Rio.createWriter(Rio.java:134) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.rio.Rio.write(Rio.java:371) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.rio.Rio.write(Rio.java:324) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.addModel(HTTPRepositoryConnection.java:588) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.flushTransactionState(HTTPRepositoryConnection.java:662) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.http.HTTPRepositoryConnection.commit(HTTPRepositoryConnection.java:326) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.conditionalCommit(AbstractRepositoryConnection.java:366) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at org.eclipse.rdf4j.repository.base.AbstractRepositoryConnection.add(AbstractRepositoryConnection.java:431) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at nl.wur.fbr.data.weather.WeatherApp.retrieveData(WeatherApp.java:122) ~[weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at nl.wur.fbr.data.weather.WeatherData$WeatherTask.run(WeatherData.java:105) [weatherData-1.0-SNAPSHOT-jar-with-dependencies.jar:na]
    at java.util.TimerThread.mainLoop(Timer.java:555) [na:1.8.0_111]
    at java.util.TimerThread.run(Timer.java:505) [na:1.8.0_111]

该HTTPRespository初始化为这样：

        repository = new HTTPRepository(rdfStore.toString());
        ((HTTPRepository)repository).setPreferredRDFFormat(RDFFormat.BINARY);
        ((HTTPRepository)repository).setPreferredTupleQueryResultFormat(TupleQueryResultFormat.BINARY);

我尝试将格式更改为TURTLE。但这没什么区别。

你能告诉我如何解决吗？

注意 RDF4J服务器和库均具有版本2.0.1（rdf4j）。

Answer 1

为了在服务器上运行此应用程序，我创建了一个jar文件（包含所有依赖项）。

有一个问题：您创建了一个“胖子”，可能没有正确合并SPI注册表文件。

RDF4J的Rio解析器（以及其他几个模块）使用Java的服务提供商接口（SPI）机制进行注册。该机制依赖于META-INF\servicesjar文件中的文本文件，其中包含每个解析器实现的完全限定名称。

合并jar时出现问题：每个Rio解析器jar都有一个具有相同名称但内容不同的注册表文件。如果您使用诸如maven程序集插件之类的工具来创建胖子jar，则每个注册表文件都会被下一个注册表文件覆盖。结果是，最后，RDF4J只能找到一个解析器-一个解析器，该解析器的注册表文件最后添加到胖子jar中。

解决方案是要么根本不创建胖子罐，要么（如果必须）使用另一种技术来创建胖子罐，该技术将合并注册表文件而不是覆盖它们。该行家遮阳插件有一个很好的配置选项：在ServicesResourceTransformer。