java - 基準 API 結合: java.lang.IllegalArgumentException: 属性を解決できません

Question

JPA基準APIを介して簡単な結合操作を行おうとしていますが、エラーが発生します:

java.lang.IllegalArgumentException: Unable to resolve attribute [Companies] to path at org.hibernate.ejb.criteria.path.AbstractPathImpl.unknownAttribute(AbstractPathImpl.java:120) at org.hibernate.ejb.criteria.path.AbstractPathImpl.locateAttribute (AbstractPathImpl.java:229) で org.hibernate.ejb.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:411) で com.maven_test.models.jpa.dao.ServicesDAO.findAllWithCompaniesByCriteria(ServicesDAO.java:106) でcom.maven_test.models.jpa.ServicesFindByIdByCriteria.test2(ServicesFindByIdByCriteria.java:44)、sun.reflect.NativeMethodAccessorImpl.invoke0(ネイティブメソッド)、sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)、sun.reflect. org.junit の DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)。runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) の org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) の org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod) .java:47) で org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) で org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) で org.junit.runners. BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) org.junit. runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) org.junit.runners.ParentRunner.run(ParentRunner.java:363) org.junit .runner.JUnitCore.run(JUnitCore.java:137) com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) ) com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) で sun.reflect.NativeMethodAccessorImpl.invoke0(ネイティブメソッド) で sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) でcom.intellij.rt.execution.application.AppMain.main(AppMain.java:134)java:268) org.junit.runners.ParentRunner.run(ParentRunner.java:363) で org.junit.runner.JUnitCore.run(JUnitCore.java:137) で com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner) .java:74) で com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) で com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) で Sun で。 com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) の sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) でのreflect.NativeMethodAccessorImpl.invoke0(ネイティブメソッド)java:268) org.junit.runners.ParentRunner.run(ParentRunner.java:363) で org.junit.runner.JUnitCore.run(JUnitCore.java:137) で com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner) .java:74) で com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) で com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) で Sun で。 com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) の sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) でのreflect.NativeMethodAccessorImpl.invoke0(ネイティブメソッド)com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) の startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) の startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) で sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) で sun.reflect.NativeMethodAccessorImpl.invoke0 (ネイティブメソッド)com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) の startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) の startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) で sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) で sun.reflect.NativeMethodAccessorImpl.invoke0 (ネイティブメソッド)execution.application.AppMain.main(AppMain.java:134)execution.application.AppMain.main(AppMain.java:134)

メソッドは次のようになります。

    public List findAllWithCompaniesByCriteria() {

    EntityManager em = EMgrUtil.createEntityManager();

    CriteriaBuilder builder = em.getCriteriaBuilder();
    CriteriaQuery<Object[]> query = builder.createQuery(Object[].class);

    Metamodel m = em.getMetamodel();

    EntityType<Services> Services_ = m.entity(Services.class);
    EntityType<Companies> Companies_ = m.entity(Companies.class);

    /*Root<Services> services = query.from(Services.class);
    Join<Services, Companies> companies = query.join(Companies_);*/

    Root<Services> s = query.from(Services.class);
    Join<Services, Companies> c = s.join("Companies", JoinType.INNER);
    query.multiselect(s.get("avatar"), c.get("name"));

    List<Object[]> list = em.createQuery(query).getResultList();

    return list;

}

結合する必要があるテーブルの名前は「zaks_companies」で、エラーはどちらの場合も同じです。

@Entity
@Table(name = "zaks_services")
public class Services {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name = "id")
private Integer id;

@Column(name = "title", nullable = false)
@Size(min = 0, max = 255)
private String title;

//@Column(name = "descr", length = 65535, columnDefinition = "Text")
//@Column(name = "descr", length = 4294967295, columnDefinition = "Longtext")
@Column(name = "descr", nullable = false, length = 16777215, columnDefinition = "Mediumtext")
private String descr;

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

@Column(name = "date_add", nullable = false, insertable = false, updatable = false, columnDefinition = "Datetime DEFAULT CURRENT_TIMESTAMP")
@Temporal(TemporalType.TIMESTAMP)
private Date date_add;

@OneToOne
@JoinColumn(name = "company_id")
private Companies companies;

...getters/setters
...default constructor

および企業モデル:

@Entity
@Table(name = "zaks_companies")
public class Companies {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Integer id;

@OneToOne(mappedBy = "companies")
private Services services;

@Column(name = "name", nullable = false)
@Size(min = 0, max = 255)
private String name;

...getters/setters
...default constructor

私のマニュアルの 1 つがここにありました: https://www.youtube.com/watch?v=J-f4jvljpgQ on 16:50

java - 基準 API 結合: java.lang.IllegalArgumentException: 属性を解決できません

1 に答える 1

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