springboot ClassNotFoundException orgspringframeworkhttpconverterjsonMappingJacksonHttpMessageConverter

The exception "ClassNotFoundException: org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" indicates that the required class "MappingJacksonHttpMessageConverter" is missing from the classpath.

This class is part of the Jackson JSON library and is used for converting JSON data to Java objects and vice versa.

To resolve this issue, you need to make sure that the Jackson JSON library is included in your project's dependencies.

If you are using Maven, you can add the following dependency to your pom.xml file:

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

If you are using Gradle, you can add the following dependency to your build.gradle file:

implementation 'com.fasterxml.jackson.core:jackson-databind:2.12.2'

After adding the dependency, rebuild your project to ensure that the required library is downloaded and included in the classpath