Question

我开发应用程序管理调查。使用@RestController执行POST方法以创建新Survey时出现错误

2020-02-19 18:10:34.257 ERROR 8648 --- [nio-8080-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.orm.jpa.JpaObjectRetrievalFailureException: Unable to find pl.wsisiz.asp.domain.OptionGroup with id 1; nested exception is javax.persistence.EntityNotFoundException: Unable to find pl.wsisiz.asp.domain.OptionGroup with id 1] with root cause
javax.persistence.EntityNotFoundException: Unable to find pl.wsisiz.asp.domain.OptionGroup with id 1
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$JpaEntityNotFoundDelegate.handleEntityNotFound(EntityManagerFactoryBuilderImpl.java:163) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:216) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:332) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:108) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:74) ~[hibernate-core-5.4.8.Final.jar:5.4.8.Final]
    at ...
.....

由于错误为unable to find optionGroupId，我认为该问题可能与Question和OptionGroup之间的关系有关。选项组可用于许多问题中，但问题始终具有1个或没有选项组。

模型-Question.java

package pl.wsisiz.asp.domain;

import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.*;

import javax.persistence.*;
import javax.validation.constraints.NotNull;
import java.util.LinkedHashSet;
import java.util.Set;

@Entity
@Table(name = "questions")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class Question {

    @Id
    @GeneratedValue
    @Column(name = "question_id")
    private Integer questionId;

    //other fields
    ...

    @ManyToOne
    @JoinColumn(name = "option_group_id")
    // @NotFound(action = NotFoundAction.IGNORE) //with this line there is no error
                                                // and optionGroup is always null 
    private OptionGroup optionGroup;
}

模型-OptionGroup.java

package pl.wsisiz.asp.domain;

import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.*;

import javax.persistence.*;
import javax.validation.constraints.NotNull;
import java.util.LinkedHashSet;
import java.util.Set;

@Entity
@Table(name = "option_groups")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class OptionGroup {

    @Id
    @GeneratedValue
    @Column(name = "option_group_id")
    private Integer optionGroupId;

    //other fields
    // ...


    @OneToMany(mappedBy = "optionGroup", cascade = {CascadeType.ALL})
    @JsonIgnore
    private Set<Question> questions = new LinkedHashSet<>();

}

在执行POST方法时，Controller使用addSurvey(@RequestBody SurveyTemplate surveyTemplate)。 SurveyTemplate是通过save()方法从JpaRepository保存的。

调用此POST方法，我将使用GET方法接收到的JSON放在正文中（此后，我删除了数据库内容）。我放在正文中的JSON看起来像这样：

{
        "surveyTemplateId": 1,
        "surveyName": "Example survey",
        "instructions": null,
        "otherInfo": null,
        "surveySections": [
            {
                "surveySectionId": 1,
                "sectionName": "Metric",
                "questions": [
                    {
                        "questionId": 1,
                        "questionName": "Age:",
                        "answerRequired": true,
                        "inputType": "CHOICE",
                        "subquestions": [],
                        "optionGroup": {
                            "optionGroupId": 1,
                            "optionGroupName": "age20-25+",
                            "optionChoices": [
                                {
                                    "optionChoiceId": 1,
                                    "optionChoiceName": "less than 20"
                                },
                                {
                                    "optionChoiceId": 2,
                                    "optionChoiceName": "20"
                                },
                                {
                                    "optionChoiceId": 3,
                                    "optionChoiceName": "21"
                                },
                                {
                                    "optionChoiceId": 4,
                                    "optionChoiceName": "22"
                                },
                                {
                                    "optionChoiceId": 5,
                                    "optionChoiceName": "23"
                                },
                                {
                                    "optionChoiceId": 6,
                                    "optionChoiceName": "24"
                                },
                                {
                                    "optionChoiceId": 7,
                                    "optionChoiceName": "more than 25"
                                }
                            ]
                        }
                    }
                ]
            }
        ]
    }

编辑：

当我用多对多关系代替多对一关系（在图中标记）时，一切正常。您可以查看此更改之前的整个ERD。但是，我实际上不知道为什么它不适用于多对一关系，以及是否有一种方法可以实现多对一关系。

ERD

EntityNotFoundException执行POST方法

0 个答案: