Question

当我们使用以下命令初始化EmbeddedKafkaBroker时：

EmbeddedKafkaBroker embeddedKafkaBroker = new EmbeddedKafkaBroker(1, true, 1, environment.getProperty("producer_topic"), environment.getProperty("consumer_topic"));
embeddedKafkaBroker.afterPropertiesSet();

第二行抛出：

method 'embeddedKafkaBroker' threw exception; nested exception is java.lang.NoClassDefFoundError: kafka/zk/EmbeddedZookeeper

编辑-添加了依赖项的GAV格式 我们已经看到许多有关依赖项不匹配的答案，因此我们检查了我们的答案。我们不能放置所有使用的pom，因此这里是相关的依赖项：

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-test</artifactId>
  <version>1.5.6.RELEASE</version>
  <exclusions>
    <exclusion>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot</artifactId>
    </exclusion>
  </exclusions>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>5.1.3.RELEASE</version>
  <scope>compile</scope>
</dependency>

<dependency>
  <groupId>org.springframework.kafka</groupId>
  <artifactId>spring-kafka-test</artifactId>
  <version>2.2.6.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework.kafka</groupId>
  <artifactId>spring-kafka</artifactId>
  <version>2.2.0.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.apache.kafka</groupId>
  <artifactId>kafka-clients</artifactId>
  <version>2.2.0</version>
</dependency>

<dependency>
  <groupId>org.apache.kafka</groupId>
  <artifactId>kafka_2.11</artifactId>
  <version>2.2.0</version>
  <exclusions>
    <exclusion>
      <artifactId>kafka-clients</artifactId>
      <groupId>org.apache.kafka</groupId>
    </exclusion>
  </exclusions>
</dependency>

<dependency>
  <groupId>org.apache.kafka</groupId>
  <artifactId>kafka-streams</artifactId>
  <version>2.0.1</version>
</dependency>

有什么想法吗？

Answer 1

您以某种方式缺少kafka_2.11-2.2.0-test.jar；通常通过spring-kafka-test暂时将其拉入。

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.12</artifactId>
    <version>2.2.0</version>
    <classifier>test</classifier>
    <scope>test</scope>
</dependency>

顺便说一句，建议2.x客户端使用scala 2_12。

另外，您的kafka-streams jar必须与kafka-clients相同。

有关如何覆盖依赖项的信息，请参见Spring for Apache Kafka reference manual appendix。

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
    <version>${spring.kafka.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka-test</artifactId>
    <version>${spring.kafka.version}</version>
    <exclusions>
        <exclusion>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka_2.11</artifactId>
        </exclusion>
    </exclusions>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.2.0</version>
</dependency>

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.2.0</version>
    <classifier>test</classifier>
</dependency>

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.12</artifactId>
    <version>2.2.0</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.12</artifactId>
    <version>2.2.0</version>
    <classifier>test</classifier>
    <scope>test</scope>
</dependency>

EmbeddedKafkaBroker设置属性引发NoClassDefFoundError：kafka / zk / EmbeddedZookeeper

1 个答案: