java - Spark和java编译错误

Question

当我使用maven编译spark java程序时，出现这样的编译错误

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/spark/java/src/main/java/SimpleApp.java:[9,36] cannot find symbol
  symbol:   variable read
  location: variable spark of type org.apache.spark.sql.SparkSession

这是我的 JAVA 程序

import org.apache.spark.sql.SparkSession;
import org.apache.spark.sql.Dataset;


public class SimpleApp {
  public static void main(String[] args) {
    String logFile = "/home/spark/spark-2.2.0-bin-hadoop2.7/README.md"; // Should be some file on your system
    SparkSession spark = SparkSession.builder().appName("Simple Application").getOrCreate();
    Dataset<String> logData = spark.read.textFile(logFile).cache();
//    Dataset<String> logData = SparkSession.builder().appName("Simple Application").getOrCreate().read.textFile(logFile).cache();
    long numAs = logData.filter(s -> s.contains("a")).count();
    long numBs = logData.filter(s -> s.contains("b")).count();

    System.out.println("Lines with a: " + numAs + ", lines with b: " + numBs);

    spark.stop();
  }
}

我按照官方网站编写程序: http://spark.apache.org/docs/latest/quick-start.html这个错误是怎么来的..？

这是我的 pom.xml

<project>
  <groupId>edu.berkeley</groupId>
  <artifactId>simple-project</artifactId>
  <modelVersion>4.0.0</modelVersion>
  <name>Simple Project</name>
  <packaging>jar</packaging>
  <version>1.0</version>
  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency> <!-- Spark dependency -->
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-sql_2.11</artifactId>
      <version>2.2.0</version>
    </dependency>
  </dependencies>
</project>

Answer 1

好的...我找到了结果..
官方网站的例子是错误的..

spark.read.textFile(logFile).cache();   -->   spark.read().textFile(logFile).cache();

read 应该是 read()