Hi, I'm newby to Hibernate... I've read different tutorials and got up and running the examples but got problems when implementing on my own :S
I got an horrible:
Code:
Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.enyel.hiphop.persistent.Alumno.matricula
Does any one have an idea what that means?
My db is about a "mini-forum":
- Tema: topic's class
- Mensaje: class for a topic's messages
- Alumno: class for author's data
Hibernate version: 3
Mapping documents:Alumno.hbm.xml
Code:
<class name="Alumno" table="Alumno">
<id name="matricula" column="MATRICULA" type="long" unsaved-value="null">
<generator class="assigned"/>
</id>
<property name="nombre" column="NOMBRE" type="string" length="20"/>
</class>
Tema.hbm.xml
Code:
<class name="Tema" table="Tema">
<id name="id" column="TEMA_ID" type="long" unsaved-value="null">
<generator class="native"/>
</id>
<many-to-one name="autorID" column="MATRICULA" class="Alumno" not-null="true"/>
<property name="titulo" column="TITULO" type="string" length="255"/>
<property name="texto" column="TEXTO" type="text"/>
<bag name="mensajes" table="Mensaje" cascade="all" lazy="false">
<key column="TEMA_ID" not-null="true"/>
<one-to-many class="Mensaje" />
</bag>
</class>
Mensaje.hbm.xml
Code:
<class name="Mensaje" table="Mensaje">
<id name="id" column="MENSAJE_ID" type="long" unsaved-value="null">
<generator class="native"/>
</id>
<property name="texto" column="TEXTO" type="text"/>
</class>
Tema.java
Code:
public class Tema {
private Long id;
private Long autorID;
private Alumno autor;
private String titulo;
private String texto;
private List mensajes;
public Tema(){ }
public Long getId() { return this.id; }
public Long getAutorID() { return this.autorID; }
public Alumno getAutor() { return this.autor; }
public String getTitulo() { return this.titulo; }
public String getTexto() { return this.texto; }
public List getMensajes() { return this.mensajes; }
private void setId(Long id) { this.id = id; }
public void setAutorID(Long autorID) { this.autorID = autorID; }
public void setAutor(Alumno autor) { this.autor = autor; }
public void setTitulo(String titulo) { this.titulo = titulo; }
public void setTexto(String texto) { this.texto = texto; }
public void setMensajes(List mensajes) { this.mensajes = mensajes; }
}
Mensaje.java
Code:
public class Mensaje {
private Long id;
private Long temaID;
private String texto;
public Mensaje(){ }
public Long getId() { return this.id; }
public Long getTemaID() { return this.temaID; }
public String getTexto() { return this.texto; }
private void setId(Long id) { this.id = id; }
public void setTemaID(Long temaID) { this.temaID = temaID; }
public void setTexto(String texto) { this.texto = texto; }
}
Alumno.java
Code:
public class Alumno {
//propiedades
private Long matricula;
private String nombre;
public Alumno() { }
public Long getMatricula() { return this.matricula; }
public String getNombre() { return this.nombre; }
public void setMatricula(Long matricula) { this.matricula = matricula; }
public void setNombre(String nombre) { this.nombre = nombre; }
}
Code between sessionFactory.openSession() and session.close():Code:
Session session = SingletonSessionFactory.getSessionFactory().getCurrentSession();
session.beginTransaction();
Alumno a1 = new Alumno();
a1.setMatricula(458793L);
a1.setNombre("Pepe el Toro");
session.save(a1);
Tema tema = new Tema();
tema.setAutor(a1);
tema.setAutorID(a1.getMatricula());
tema.setTitulo("Main topic example");
tema.setTexto("this is the text for the main topic example");
session.save(tema);
session.getTransaction().commit();
SingletonSessionFactory.getSessionFactory().close();
Full stack trace of any exception that occurs:Code:
Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.enyel.hiphop.persistent.Alumno.matricula
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3589)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3305)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:181)
at org.hibernate.engine.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:137)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:69)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:47)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
at $Proxy0.save(Unknown Source)
at com.enyel.hiphop.test.Test.main(Test.java:50)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
... 25 more
Name and version of the database you are using: MySQL
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