SpringMVC error information when using JSON: Content type 'application / json; charset = UTF-8' not supported

Direct reason: my (maven) project parent parent project pom.xml lack the necessary three jar package dependencies coordinates.

The solution: Add springMVC JSON implemented using AJAX request pom.xml web submodule inside.

<!--spring mvc-json依赖-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.9</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.9</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.9</version>
        </dependency>

<spring.version>5.0.15.RELEASE</spring.version>

=====================
end

References:

Ajax solution on the request to pass an array parameter