I'm trying to make a simple join operation via jpa criteria api, but I'm getting an error:
java.lang.IllegalArgumentException: Unable to resolve attribute [Companies] against path at org.hibernate.ejb.criteria.path.AbstractPathImpl.unknownAttribute(AbstractPathImpl.java:120) at org.hibernate.ejb.criteria.path.AbstractPathImpl.locateAttribute(AbstractPathImpl.java:229) at org.hibernate.ejb.criteria.path.AbstractFromImpl.join(AbstractFromImpl.java:411) at com.maven_test.models.jpa.dao.ServicesDAO.findAllWithCompaniesByCriteria(ServicesDAO.java:106) at com.maven_test.models.jpa.ServicesFindByIdByCriteria.test2(ServicesFindByIdByCriteria.java:44) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at 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) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Method looks like:
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; } A name of the table which we have to join is "zaks_companies", an error is same with both of cases.
@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 and Companies model:
@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 One of my manuals was here: https://www.youtube.com/watch?v=J-f4jvljpgQ on 16:50
