Question

大家好，

我有这个项目，在这里我使用ModelMapper将我的实体与DTO配对，反之亦然，并且还有一个具有@ElementCollection关系的类。该映射器似乎对于所有其他方法都可以正常工作，并且它只是按照我的需要输出该实体，但是当涉及到删除映射时，我得到了以下错误以及500 http状态的输出。这是错误：

“ ModelMapper映射错误：\ r \ n \ r \ n1）转换器org.modelmapper.internal.converter.CollectionConverter@ddb7bc7无法将java.util.List转换为java.util.List。\ r \ n \ r \ n1错误”

这是代码：

实体类：

let data =["John Doe","Lutfur Kabir", "Moshiur Imtiaz Rahman", "Clark Kent","Jenny Doe"];

let result = data.reduce((r, c, i) => {
  if(c.includes('Doe')) { r.push(i); }
  return r;
}, []);

console.log(result);

DTO类：

webview

删除控制器：

@Entity
@Table(name = "quiz_engines")
@EntityListeners(AuditingEntityListener.class)
@JsonIgnoreProperties(
    value = {"lastModified"},
    allowGetters = true
)
public class Engine implements Model {

@Id
@Column(name = "engine_id", unique = true, nullable = false)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@ManyToOne(fetch = FetchType.LAZY,optional = false, targetEntity = com.QCMGenerator.QCMGenerator.Model.Test.class)
@JoinColumn(name = "test_id", referencedColumnName = "test_id", nullable = false, updatable = false)
@OnDelete(action = OnDeleteAction.NO_ACTION)
@JsonIgnore
private Test test;

@Column(name = "quiz_name", nullable = false)
@NotNull
private String name;

@Temporal(TemporalType.TIMESTAMP)
@Column(name = "last_modified", nullable = false)
@LastModifiedDate
private Date lastModified;

@ElementCollection
@CollectionTable(name = "engine_constraints", joinColumns = @JoinColumn(name = "engine_id"))
private List<EngineConstraint> constraints;

public Engine() {
}

public Engine(@NotNull String name, List<EngineConstraint> constraints) {
    this.name = name;
    this.constraints = constraints;
}

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public Test getTest() {
    return test;
}

public void setTest(Test test) {
    this.test = test;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Date getLastModified() {
    return lastModified;
}

public void setLastModified(Date lastModified) {
    this.lastModified = lastModified;
}

public List<EngineConstraint> getConstraints() {
    return constraints;
}

public void setConstraints(List<EngineConstraint> constraints) {
    this.constraints = constraints;
}
}

希望你们能为您提供帮助，感谢大家的宝贵时间，并祝您生活愉快。

ModelMapper无法在DeleteMapping上将java.util.list转换为java.util.list

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