SyntaxError：JSON.parse：JSON数据的第2183行第295行的属性名称时的数据结尾

问题描述

Kotlin Spring多对多关系存储库无法正常工作。我必须反对与许多多关系的类。当我尝试保存一些示例数据并稍后将其打印出来时。当在JSON数据的第2183行第295列中需要属性名称时，出现错误SyntaxError：JSON.parse：数据结尾。

屏幕截图错误：

这是我的代码：

data class Field(
  var name: String = "",@ManyToMany(cascade = arrayOf(CascadeType.ALL))
  @JoinTable(name = "field_subject",joinColumns = arrayOf(JoinColumn(name = "field_id",referencedColumnName = "id")),inverseJoinColumns = arrayOf(JoinColumn(name = "subject_id",referencedColumnName = "id")))
  var subjects: List<Subject> = mutablelistof<Subject>(),@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
  val id: Long = -1
){

  override fun toString(): String{
    return "{field: ${this.name},subjects: ${subjects.map { it->it.name }}}";
  }
}

@Entity @Table(name = "subject")
data class Subject(
  var name: String = "",@ManyToMany(mappedBy = "subjects")
  var fields: List<Field> = mutablelistof<Field>(),@Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  var id: Long = -1
) {
  override fun toString(): String{
    return "{subject: ${this.name},fields: ${fields.map { it->it.name }}}";
  }
}

@RestController
@RequestMapping("/field")
class FieldController {
  @Autowired
  lateinit var fieldRepository: FieldRepository

  @Autowired
  lateinit var subjectRepository: SubjectRepository

  @GetMapping
  fun getFields() = fieldRepository.findAll()

  @PostMapping
  fun postField(@RequestBody field: Field): Field{
    return fieldRepository.save( Field(field.name));
  }

  @GetMapping("/save")
  fun save(): String {

    //prepare subjects
    var subject = subjectRepository.findById(1).get()
    var secondSubject = subjectRepository.findById(2).get()

    println("==================ATTACH SUBJECTS")
    println(subject.id.toString() + " - " + subject.id.toString())

    // attached subjects for each student
    val jack = Field("Field 0",listof(subject,secondSubject))
    val peter = Field("Field 1",listof(subject))

    // persist students to database
    fieldRepository.save(jack)
    fieldRepository.save(peter)
    return "Done!"
  }
}

解决方法

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