一、依赖完全按照视频里的配置
log-sss的pom.xml中

    <dependencies>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_2.12</artifactId>
        </dependency>
     </dependencies>

二、运行WordCount.scala
（1）报错1

Symbol 'type org.apache.spark.internal.Logging' is missing from the classpath.
This symbol is required by 'class org.apache.spark.sql.SparkSession'.
Make sure that type Logging is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'SparkSession.class' was compiled against an incompatible version of org.apache.spark.internal.
    val spark = SparkSession

（2）报错2

Symbol 'type org.apache.spark.internal.Logging' is missing from the classpath.
This symbol is required by 'class org.apache.spark.sql.streaming.DataStreamReader'.
Make sure that type Logging is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'DataStreamReader.class' was compiled against an incompatible version of org.apache.spark.internal.
    val lines = spark.readStream

（3）报错3

Symbol 'type org.apache.spark.sql.Encoder' is missing from the classpath.
This symbol is required by 'value org.apache.spark.sql.SQLImplicits.evidence$7'.
Make sure that type Encoder is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'SQLImplicits.class' was compiled against an incompatible version of org.apache.spark.sql.
      .option("port", 9999)

（4）报错4

Symbol 'type org.apache.spark.sql.Encoder' is missing from the classpath.
This symbol is required by 'method org.apache.spark.sql.LowPrioritySQLImplicits.newProductEncoder'.
Make sure that type Encoder is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'LowPrioritySQLImplicits.class' was compiled against an incompatible version of org.apache.spark.sql.
      .option("port", 9999)

（5）报错5

Symbol 'type org.apache.spark.sql.Encoder' is missing from the classpath.
This symbol is required by 'value org.apache.spark.sql.Dataset.evidence$2'.
Make sure that type Encoder is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'Dataset.class' was compiled against an incompatible version of org.apache.spark.sql.
    val words = lines.as[String].flatMap(_.split(" "))

（6）报错6

could not find implicit value for evidence parameter of type org.apache.spark.sql.Encoder[String]
    val words = lines.as[String].flatMap(_.split(" "))

代码部分

依赖部分