$ .Ajax function call interfaces, reported abnormal No converter found for return value of type: class java.util.ArrayList

Interface to perform normal, abnormal returns 500, the exception details to the newspaper front-end server:

org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type: class java.util.ArrayList

 

Not go into the reasons, perhaps $ .ajax function data type received at the front end of JSON, the service can not be converted into JSON ArrayList class.

Write down the temporary solution - adding a dependency JSON family bucket in the project are as follows:

<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>