我正在尝试向兽人写入数据帧，但无济于事。我正在使用 Spark 1.6 和 Java。我在本地计算机上运行，我尝试安装一些依赖项但没有成功。我有一个工作火花，我想将其写入 orc 文件，但此错误返回给我：Exception in thread "main" java.lang.ClassNotFoundException: Failed to find data source: orc. Please find packages at http://spark-packages.org    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.lookupDataSource(ResolvedDataSource.scala:77)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:219)    at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:148)    at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:139)    at Confiaveis.main(Confiaveis.java:96)Caused by: java.lang.ClassNotFoundException: orc.DefaultSource    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4$$anonfun$apply$1.apply(ResolvedDataSource.scala:62)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4$$anonfun$apply$1.apply(ResolvedDataSource.scala:62)    at scala.util.Try$.apply(Try.scala:192)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4.apply(ResolvedDataSource.scala:62)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4.apply(ResolvedDataSource.scala:62)    at scala.util.Try.orElse(Try.scala:84)    at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.lookupDataSource(ResolvedDataSource.scala:62)    ... 4 more我用这个命令来写：df.write().mode("append").format("orc").save("path");有谁知道我该如何解决这个问题？据我对 Spark 的了解，我知道这是他找不到的图书馆，但我找不到任何地方来澄清该图书馆是什么。