Question

我在创建JavaStreamingContext时遇到AbstractMethodError异常。我的依赖项pom如下；无法找到线索，任何人都可以建议这里出了什么问题吗？

    <dependency> <!-- Spark dependency -->
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.11</artifactId>
        <version>2.3.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency> <!-- Spark dependency -->
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.3.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming_2.11</artifactId>
        <version>2.2.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka-0-10 -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming-kafka-0-10_2.11</artifactId>
        <version>2.0.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka -->
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka_2.10</artifactId>
        <version>0.8.2.2</version>
    </dependency>

线程“ main”中的异常java.lang.AbstractMethodError 在org.apache.spark.util.ListenerBus $ class。$ init $（ListenerBus.scala：35）在org.apache.spark.streaming.scheduler.StreamingListenerBus。（StreamingListenerBus.scala：30）在org.apache.spark.streaming.scheduler.JobScheduler。（JobScheduler.scala：57）在org.apache.spark.streaming.StreamingContext。（StreamingContext.scala：184）在org.apache.spark.streaming.StreamingContext。（StreamingContext.scala：76）在org.apache.spark.streaming.api.java.JavaStreamingContext。（JavaStreamingContext.scala：130）

Answer 1

您在此处混合了许多版本的Spark
首先，如果您使用的是Apache Spark 2.3.1和kafka 0.10 +

我建议以下内容：

<dependency> <!-- Spark dependency -->
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.11</artifactId>
        <version>2.3.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency> <!-- Spark dependency -->
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.3.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming_2.11</artifactId>
        <!-- Keep the same Spark version as before -->
        <version>2.3.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka-0-10 -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming-kafka-0-10_2.11</artifactId>
        <!-- Keep the same Spark version as before -->
        <version>2.3.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka -->
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka_2.10</artifactId>
        <!-- Support for kafka version 0.8 is deprecated as of Spark 2.3.1 and you add the dependencies for kafka 0.10+ above -->
        <version><your_kafka_version_0.10+></version>
    </dependency>

很高兴知道您如何构建/部署应用程序？根据您的运行时环境，您可能想要添加一些提供的作用域，以防止生成的程序包与现有环境之间发生冲突。

希望有帮助

实例化JavaStreamingContext时出现AbstractMethodError异常

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