为什么 Spark 应用程序会因“线程“main"中的“异常"而失败?java.lang.NoClassDefFoundError: ...StringDeserializer"? [英] Why does Spark application fail with "Exception in thread "main" java.lang.NoClassDefFoundError: ...StringDeserializer"?

问题描述

我正在开发一个使用 Spark 和 Java 侦听 Kafka 流的 Spark 应用程序.

I am developing a Spark application that listens to a Kafka stream using Spark and Java.

我使用 kafka_2.10-0.10.2.1.

I use kafka_2.10-0.10.2.1.

我为 Kafka 属性设置了各种参数:bootstrap.servers、key.deserializer、value.deserializer 等

I have set various parameters for Kafka properties: bootstrap.servers, key.deserializer, value.deserializer, etc.

我的应用程序编译正常，但是当我提交它时，它失败并显示以下错误:

My application compiles fine, but when I submit it, it fails with the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/kafka/common/serialization/StringDeserializer

我确实将 StringDeserializer 用于 key.deserializer 和 value.deserializer，所以它确实与我编写应用程序的方式有关.

I do use StringDeserializer for key.deserializer and value.deserializer so it's indeed related to how I wrote my application.

pom.xml中使用的各种maven依赖:

Various maven dependencies used in pom.xml:

    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.11</artifactId>
        <version>2.1.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming_2.10</artifactId>
        <version>2.1.1</version>
    </dependency>

    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-streaming-kafka-0-10_2.11</artifactId>
        <version>2.1.1</version>
    </dependency>

我已经尝试更新 Spark Streaming/kafka 的版本.我在任何地方都找不到太多东西.

I have tried updating the version of spark streaming/kafka. I could not find much anywhere.

推荐答案

spark-streaming_2.10

这取决于 Scala 2.10

This is dependent upon Scala 2.10

您的其他依赖项使用的是 Scala 2.11

Your other dependencies are using Scala 2.11

升级版本是当前错误的正确解决方案.

Upgrading the version is the correct solution for the current error.

并确保在streaming-kafka-0-10中，这与您正在运行的Kafka版本相匹配

And make sure that within streaming-kafka-0-10, this matches the version of Kafka you're running

应用程序编译正常，但是当我尝试提交 spark 作业时，它显示错误:线程main"中的异常 java.lang.NoClassDefFoundError:

Application is compiling fine but when I am trying to submit the spark job, its showing error: Exception in thread "main" java.lang.NoClassDefFoundError:

默认情况下，maven 不包含依赖 jars构建目标

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