Spark 2.4.0 Avro Java-无法解析from_avro方法

我正在尝试从包含Avro消息的kafka队列中运行火花流.

按照https://spark.apache.org/docs/latest/sql-data-sources-avro.html,我应该能够使用from_avro将列值转换为Dataset< Row>.

但是,我无法编译该项目,因为它抱怨找不到from_avro.我可以看到在依赖项的package.class中声明的方法-请参见所附的屏幕截图.

如何在本地Java代码中使用org.apache.spark.sql.avro中的from_avro方法？

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

import static org.apache.spark.sql.functions.*;
import org.apache.spark.sql.avro.*;


public class AvroStreamTest {
    public static void main(String[] args) throws IOException, InterruptedException {

     // Creating local sparkSession here...

        Dataset<Row> df = sparkSession
                .readStream()
                .format("kafka")
                .option("kafka.bootstrap.servers", "host:port")
                .option("subscribe", "avro_queue")
                .load();

        // Cannot resolve method 'from_avro'...
        df.select(from_avro(col("value"), jsonFormatSchema)).writeStream().format("console")
                .outputMode("update")
                .start();


    }
}

pom.xml：

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency> 
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.4.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.11</artifactId>
        <version>2.4.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-avro_2.11</artifactId>
        <version>2.4.0</version>
    </dependency>
  <!-- more dependencies below -->

</dependencies>

看来Java无法从sql.avro.package.class导入名称

解决方法:

因为生成了类名,所以将其作为import org.apache.spark.sql.avro.package $导入；然后使用package $.MODULE $.from_avro(…)应该可以工作