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Merge pull request #5672 from asturcon/string-cast-jpa 

BAEL-2239 - JPA error "java.lang.String cannot be cast to [Ljava.lang.String;"
This commit is contained in:
Loredana Crusoveanu 2018-11-19 22:05:46 +02:00 committed by GitHub
parent fcca31572b 8d745e684e
commit 7de531a320
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4 changed files with 13 additions and 17 deletions
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9
persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/stringcast/DummyEntity.java → persistence-modules/java-jpa/src/main/java/com/baeldung/jpa/stringcast/Message.java
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@ -3,13 +3,12 @@ package com.baeldung.jpa.stringcast;
import javax.persistence.*; import javax.persistence.*;
@SqlResultSetMapping(name = "textQueryMapping", classes = { @SqlResultSetMapping(name = "textQueryMapping", classes = {
@ConstructorResult(targetClass = DummyEntity.class, columns = { @ConstructorResult(targetClass = Message.class, columns = {
@ColumnResult(name = "text") @ColumnResult(name = "text")
}) })
}) })
@Entity @Entity
@Table(name = "dummy") public class Message {
public class DummyEntity {
@Id @Id
@GeneratedValue(strategy = GenerationType.IDENTITY) @GeneratedValue(strategy = GenerationType.IDENTITY)
@ -17,11 +16,11 @@ public class DummyEntity {
private String text; private String text;
public DummyEntity() { public Message() {
} }
public DummyEntity(String text) { public Message(String text) {
this.text = text; this.text = text;
} }

2
persistence-modules/java-jpa/src/main/resources/META-INF/persistence.xml
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@ -23,7 +23,7 @@
<persistence-unit name="jpa-h2"> <persistence-unit name="jpa-h2">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.baeldung.jpa.stringcast.DummyEntity</class> <class>com.baeldung.jpa.stringcast.Message</class>
<properties> <properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver" /> <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" /> <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" />

17
persistence-modules/java-jpa/src/test/java/com/baeldung/jpa/stringcast/SpringCastUnitTest.java
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@ -3,10 +3,7 @@ package com.baeldung.jpa.stringcast;
import org.junit.BeforeClass; import org.junit.BeforeClass;
import org.junit.Test; import org.junit.Test;
import javax.persistence.EntityManager; import javax.persistence.*;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import java.util.List; import java.util.List;
import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertEquals;
@ -22,18 +19,18 @@ public class SpringCastUnitTest {
em = emFactory.createEntityManager(); em = emFactory.createEntityManager();
// insert an object into the db // insert an object into the db
DummyEntity dummyEntity = new DummyEntity(); Message message = new Message();
dummyEntity.setText("text"); message.setText("text");
EntityTransaction tr = em.getTransaction(); EntityTransaction tr = em.getTransaction();
tr.begin(); tr.begin();
em.persist(dummyEntity); em.persist(message);
tr.commit(); tr.commit();
} }
@Test(expected = ClassCastException.class) @Test(expected = ClassCastException.class)
public void givenExecutorNoCastCheck_whenQueryReturnsOneColumn_thenClassCastThrown() { public void givenExecutorNoCastCheck_whenQueryReturnsOneColumn_thenClassCastThrown() {
List<String[]> results = QueryExecutor.executeNativeQueryNoCastCheck("select text from dummy", em); List<String[]> results = QueryExecutor.executeNativeQueryNoCastCheck("select text from message", em);
// fails // fails
for (String[] row : results) { for (String[] row : results) {
@ -43,13 +40,13 @@ public class SpringCastUnitTest {
@Test @Test
public void givenExecutorWithCastCheck_whenQueryReturnsOneColumn_thenNoClassCastThrown() { public void givenExecutorWithCastCheck_whenQueryReturnsOneColumn_thenNoClassCastThrown() {
List<String[]> results = QueryExecutor.executeNativeQueryWithCastCheck("select text from dummy", em); List<String[]> results = QueryExecutor.executeNativeQueryWithCastCheck("select text from message", em);
assertEquals("text", results.get(0)[0]); assertEquals("text", results.get(0)[0]);
} }
@Test @Test
public void givenExecutorGeneric_whenQueryReturnsOneColumn_thenNoClassCastThrown() { public void givenExecutorGeneric_whenQueryReturnsOneColumn_thenNoClassCastThrown() {
List<DummyEntity> results = QueryExecutor.executeNativeQueryGeneric("select text from dummy", "textQueryMapping", em); List<Message> results = QueryExecutor.executeNativeQueryGeneric("select text from message", "textQueryMapping", em);
assertEquals("text", results.get(0).getText()); assertEquals("text", results.get(0).getText());
} }

2
persistence-modules/java-jpa/src/test/resources/persistence.xml
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@ -20,7 +20,7 @@
<persistence-unit name="jpa-h2"> <persistence-unit name="jpa-h2">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.baeldung.jpa.stringcast.DummyEntity</class> <class>com.baeldung.jpa.stringcast.Message</class>
<properties> <properties>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver" /> <property name="javax.persistence.jdbc.driver" value="org.h2.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" /> <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:test" />