java - SpringBoot : Failing at serialize Integer class

Question

具有 Integer 属性的类的对象列表的序列化存在问题。

异常(exception)情况是:

Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[0]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[0])

该类是:Discipline.java

public class Discipline extends AbstractModel {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    private String course;

    private Integer teoricLoad;

    private Integer exerciseLoad;

    private Integer labLoad;

    // Ignored getters and setters
}

我检查了对象和学科列表，只是整数属性不为空。

Answer 1

您可以使用以下命令告诉 jackson 忽略它们:

@JsonIgnoreProperties 在你的类(class)

或者单独在每个字段的 getter 处出现此错误

@JsonIgnore