using annotation based POJO classes to map to DB table in hibernate 3 + spring 4

[subuhi nigar]

Hi ,

I am facing some problem in mapping entity POJO using annotation in hibenrate 3.0 + spring 4.1 . ( i m using java .persistence.* annotation package )

in my app-servlet.xml below is the mapping done .

	<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource"><ref bean="dataSource"/></property>
		<property name="packagesToScan" value="com.Blueclouds.form" />
		<property name="configLocation" value="classpath:hibernate.cfg.xml" />
	</bean>
	 
    <bean id="productDao" class="com.BlueClouds.dao.HbmProductDao"> 
     <property name="sessionFactory"><ref bean="mySessionFactory"/></property>        
    </bean>

    <bean id="productManager" class="com.BlueClouds.service.SimpleProductManager"  >
        <property name="productDao" ref="productDao"/>
    </bean>

in hibernate.cfg.xml below mapping are available

<hibernate-configuration>
<session-factory>
    /* DB related props */ commented for redusing post length
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
      <property name="hibernate.hbm2ddl.auto">update</property>
      <!-- Mapping files -->
      
      <mapping resource="/com/BlueClouds/entity/ShUsers.hbm.xml"/>
    <!-- <mapping class="com.BlueClouds.form.Subscriber"/>-->
    
</session-factory>
</hibernate-configuration>

when i call session.save(object of subscriber ) it gives run time exception of " Unknown Entity : com.BlueClouds.form.Subscriber "

but if i uncomment <mapping class="com.BlueClouds.form.Subscriber"/> line in hibernate.cfg.xml the app gives exception while loading

org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="com.BlueClouds.form.Subscriber"/>

The thing is ShUsers table having POJO without annotation works fine .
Only subscriber table that is having annotation based POJO and no .hbm.xml file gives error.

I have few doubts
1) is it due to "packagesToScan" property being ignored in app-servlet.xml ?
2) is it mandatory to add <mapping class=""/> in hibernate.hbm.xml ?

Please help in rectifying this problem .

Thanks

[Tushar Goel]

can you post subscriber class?

Have you used @Entity on subscriber ?

[subuhi nigar]

@Entity
@Table(name = "subscriber")

public class Subscriber implements Serializable{
	

	
	private int userid;
	private String fname;
	private String lname;
	private String username;
	private String password;
	private Long mobileno ;
	private String ctrycode;
	private String emailid;
	private String dob;
	
	private char isNew;
	
	@Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name = "userid",unique = true)
	public int getUserid() {
		return userid;
	}
	public void setUserid(int userid) {
		this.userid = userid;
	}
	@Column(name = "firstname", nullable = false)
	public String getFname() {
		return fname;
	}
---- more code----

}

[subuhi nigar]

Hi ,

I resolved my problem by doing below steps ....

1) Adding configuration class in app-servlet.xml explicitly to AnnotationConfiguration

<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource"><ref bean="dataSource"/></property>
<property name="packagesToScan" value="com.Blueclouds.form" />
<property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration" />
<property name="configLocation" value="classpath:hibernate.cfg.xml" />
</bean>

2) After adding this class i got another exception
java.lang.NoClassDefFoundError: org/apache/lucene/analysis/standard/StandardAnalyzer

that i solved by explicitly downloading lucene.2.9.1.jar from apache's website.

Now i am able to insert records in DB.


However, this whole case has generated few doubts in my mind.

1) Why one has to use JPA annotation? isn't hibernate annotation jar sufficient enough to do the same work what JPA annotations do ?

2) Why at all one use annotations ? because every thing that can be done in annotation can be done easily by mapping hbm.xml files .

3) Why in my case there is dependency on lucene.jar ? while i haven't seen on any of tutorial on web using this jar in hibernate .
i am using hibernate-core-3.3.2.GA.jar and hibernate-annotations.3.3.1.jar and hibernate - common-annotation.3.3.1.jar and hibernate-jpa.2.0.api.jar

Thanks in advance.