For example you have these 3 classes
@Entity
@Table(name = "book")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "clazz", discriminatorType = DiscriminatorType.STRING)
public abstract class Book implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
@Column(name = "id")
private Long id;
@Column(name = "title")
private String title;
@Column(name = "ISBN")
private String isbn;
}
@Entity(name = "PaperBook")
@DiscriminatorValue(value = "PaperBook")
public class PaperBook extends Book {
@Column(name = "pages")
private Integer pages;
}
@Entity(name = "AudioBook")
@DiscriminatorValue(value = "AudioBook")
public class AudioBook extends Book {
@Column(name = "medium")
private String medium;
@Column(name = "length_in_minutes")
private Integer lengthInMinutes;
}
I do not write out all getter, setter, equals, hashCode, toString Methods because it is just an example.
Then you are going to see this exception:
java.lang.NoSuchMethodError: de.mischur.library.entities.Book.(Lorg/eclipse/persistence/internal/descriptors/PersistenceObject;)V
at de.mischur.library.entities.PaperBook.(PaperBook.java)
at de.mischur.library.entities.PaperBook._persistence_new(PaperBook.java)
at org.eclipse.persistence.internal.descriptors.PersistenceObjectInstantiationPolicy.buildNewInstance(PersistenceObjectInstantiationPolicy.java:30)
at org.eclipse.persistence.descriptors.ClassDescriptor.selfValidationAfterInitialization(ClassDescriptor.java:3870)
at org.eclipse.persistence.descriptors.ClassDescriptor.validateAfterInitialization(ClassDescriptor.java:5688)
at org.eclipse.persistence.descriptors.ClassDescriptor.postInitialize(ClassDescriptor.java:3547)
at org.eclipse.persistence.descriptors.ClassDescriptor.postInitialize(ClassDescriptor.java:3447)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:526)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:476)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:435)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:676)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.login(DatabaseSessionImpl.java:634)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:208)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:488)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:188)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:277)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:294)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:272)
at org.springframework.orm.jpa.JpaTransactionManager.createEntityManagerForTransaction(JpaTransactionManager.java:445)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:366)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener$TransactionContext.startTransaction(TransactionalTestExecutionListener.java:513)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.startNewTransaction(TransactionalTestExecutionListener.java:271)
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.beforeTestMethod(TransactionalTestExecutionListener.java:164)
at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:358)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
So far I know until now this problem occurs when eclipselink is weaving your class outside of an JEE container.
To avoid that problem you should disable internal weaving your persistence.xml file
or set it via property map
propertiesMap.put(PersistenceUnitProperties.WEAVING_INTERNAL, "false");
or when using spring you can use the earlier described ExtendedEclipseLinkJpaVendorAdapter
and set the property in the spring config file