No suitable constructor found for type [simple type, class java.time.LocalDateTime]

Question

My program is written in Java 8, when I use the type of LocalDateTime, it will give me the following error:

No suitable constructor found for type [simple type, class java.time.LocalDateTime]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: [B@5976fe6f; line: 1, column: 80] (through reference chain: com.boot.framwork.entity.UserInfo["accessTime"])

The entity is like this:

public class UserInfo implements Serializable {

private static final long serialVersionUID = 1L;

private String username;

private int age;

private LocalDateTime accessTime;

private Date time;

private List<String> list = new ArrayList<String>();

private boolean isMarried;

public UserInfo() {

}

It worked when I didn't use LocalDateTime

Answer 1

It seems to me, that you don't have a JSR310 support. Jackson need some additional configuration to be able to recognize Java 8 Date&Time API data types. You can add it via project dependencies, just add a dependency on this

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.7.4</version>
</dependency>

or if you use a Gradle

compile group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version: '2.7.4'

Since you use SpringBoot, this should be enough, hence not, create a Bean of type JSR310Module manually.