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[BAEL-4056] Guide to MultipleBagFetchException (#10304) 

* Removes DummyEntity
* Uses Artist Entity instead of DummyEntity
This commit is contained in:
Emmanuel Yasa 2020-12-05 10:44:40 +08:00 committed by GitHub
parent 2700958ec0
commit bc281bde2f
3 changed files with 3 additions and 47 deletions
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43
persistence-modules/java-jpa-3/src/main/java/com/baeldung/jpa/multiplebagfetchexception/DummyEntity.java
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@ -1,43 +0,0 @@
package com.baeldung.jpa.multiplebagfetchexception;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import java.util.List;
import java.util.Objects;
@Entity
class DummyEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@ElementCollection
private List<String> collection1;
@ElementCollection
private List<String> collection2;
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
DummyEntity that = (DummyEntity) o;
return Objects.equals(id, that.id);
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
protected DummyEntity() {
}
}

1
persistence-modules/java-jpa-3/src/main/resources/META-INF/persistence.xml
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@ -57,7 +57,6 @@
</persistence-unit>
<persistence-unit name="jpa-h2-multiple-bag-fetch-exception">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.baeldung.jpa.multiplebagfetchexception.DummyEntity</class>
<class>com.baeldung.jpa.multiplebagfetchexception.Album</class>
<class>com.baeldung.jpa.multiplebagfetchexception.Song</class>
<class>com.baeldung.jpa.multiplebagfetchexception.User</class>

6
persistence-modules/java-jpa-3/src/test/java/com/baeldung/jpa/multiplebagfetchexception/MultipleBagFetchExceptionIntegrationTest.java
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@ -29,9 +29,9 @@ public class MultipleBagFetchExceptionIntegrationTest {
public void whenFetchingMoreThanOneBag_thenThrowAnException() {
IllegalArgumentException exception =
assertThrows(IllegalArgumentException.class, () -> {
String jpql = "SELECT dummy FROM DummyEntity dummy "
+ "JOIN FETCH dummy.collection1 "
+ "JOIN FETCH dummy.collection2 ";
String jpql = "SELECT artist FROM Artist artist "
+ "JOIN FETCH artist.songs "
+ "JOIN FETCH artist.offers ";
entityManager.createQuery(jpql);
});