java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/JsonNode

异常：

java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/JsonNode

　　at org.apache.kafka.clients.admin.NewTopic.convertToCreatableTopic(NewTopic.java:127)
　　at org.apache.kafka.clients.admin.KafkaAdminClient.createTopics(KafkaAdminClient.java:1422)
　　at org.apache.kafka.clients.admin.Admin.createTopics(Admin.java:127)
　　at org.springframework.kafka.core.KafkaAdmin.addTopics(KafkaAdmin.java:264)
　　at org.springframework.kafka.core.KafkaAdmin.addTopicsIfNeeded(KafkaAdmin.java:221)
　　at org.springframework.kafka.core.KafkaAdmin.initialize(KafkaAdmin.java:189)
　　at org.springframework.kafka.core.KafkaAdmin.afterSingletonsInstantiated(KafkaAdmin.java:157)
　　at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:963)
　　at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:923)
　　at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588)
　　at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767)
　　at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
　　at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426)
　　at org.springframework.boot.SpringApplication.run(SpringApplication.java:326)
　　at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:123)
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.JsonNode

　　at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
　　at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
　　at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
　　at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

问题出现：

    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("custom-kafka-1")
                .partitions(10)
                .replicas(3)
                .compact()
                .build();
    }

原因：

　　Jackson包版本冲突导致

项目Springboot：2.4.2

引入spring-kafka版本：2.6.5

spring-kafka依赖的Jackson版本为 2.11.3

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.11.3</version>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.11.3</version>
      <scope>compile</scope>
      <optional>true</optional>
    </dependency>

springboot自带依赖的Jackson版本：2.11.4

 

导致 spring-kafka 依赖的 Jackson 2.11.3版本失效，实际依赖的是2.11.4版本。

解决方案：

在项目中添加Jackson依赖，覆盖springboot和spring-kafka的Jackson依赖

 　　　　<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.11.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.11.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.11.3</version>
        </dependency>

END.