线程“主”java.lang.NoClassDefFoundError 中的异常：org/apache/hadoop/fs/StreamCapabilities。没有版本问题[重复]

Question

我正在尝试将数据从 aws s3 读取到 Java 中的 dataset/rdd 中。我在 IntelliJ 上用 Java 运行 Spark 代码，所以在 pom.xml 中也添加了 Hadoop 依赖项

下面是我的代码和 pom.xml 文件。

    import org.apache.spark.api.java.JavaRDD;
    import org.apache.spark.sql.SparkSession;
    import org.apache.spark.api.java.JavaSparkContext;

    public class SparkJava {

        public static void main(String[] args){

            SparkSession spark  = SparkSession
                    .builder()
                    .master("local")
                    .config("spark.hadoop.fs.s3a.impl","org.apache.hadoop.fs.s3a.S3AFileSystem")                  
                    .config("spark.hadoop.mapreduce.fileoutputcommitter.algorithm.version", "2")
                    .config("fs.s3n.awsAccessKeyId", AWS_KEY)
                    .config("fs.s3n.awsSecretAccessKey", AWS_SECRET_KEY)
                    .getOrCreate();

            JavaSparkContext sc = new JavaSparkContext(spark.sparkContext());
            String input_path = "s3a://bucket/2018/07/28";
            JavaRDD<String> s3aRdd = sc.textFile(input_path);
            long count  = s3aRdd.count();  // THIS IS CAUSING EXCEPTION
            System.out.print(count);
            System.out.print("Finished");         
        }
    }

这里是 pom.xml 的依赖项

<dependencies>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.11</artifactId>
        <version>2.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-aws</artifactId>
        <version>3.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-hdfs</artifactId>
        <version>3.1.1</version>
    </dependency>
</dependencies>

此问题中提到的这种情况下没有版本问题：NoClassDefFoundError: org/apache/hadoop/fs/StreamCapabilities while reading s3 Data with spark

Answer 1

通过在 pom.xml 中添加以下依赖项解决了这个问题：

<dependency>
    <groupId>org.apache.hadoop</groupId>
    <artifactId>hadoop-common</artifactId>
    <version>3.1.1</version>
</dependency>