EJB3: Mapping Persistent Objects Example 1

by admin ~ October 21, 2008

Following are the example from the chapter “Mapping Persistent Objects” from the book “Enterprise JavaBeans 3.0″ by Bill Bruke & Richard Monson-Haefel. This example I have tried it out on JBoss AS 5.0.0.CR1. I have used Postgresql as the database. And I have used eclipse WTP as IDE.

Example 1: Basic Property Mappings

This example shows the use of @Temporal, @Lob and @Enumerated mapping types.

Client.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

package com.titan.clients;
 
import com.titan.travelagent.TravelAgentRemote;
import com.titan.domain.*;
 
import javax.naming.Context;
 
public class Client {
	public static void main(String[] args) {
		try {
			Context jndiContext = getInitialContext();
			Object ref = jndiContext
					.lookup("TitanCruises/TravelAgentBean/remote");
			TravelAgentRemote dao = (TravelAgentRemote) ref;
 
			Customer cust = new Customer();
			cust.setFirstName("Bill");
			cust.setLastName("Burke");
			cust.setCustomerType(CustomerType.BIG_SPENDAH);
 
			JPEG oneUglyDude = new JPEG();
			cust.setPicture(oneUglyDude);
 
			int pk = dao.createCustomer(cust);
 
			cust = dao.findCustomer(pk);
			System.out.println(cust.getFirstName());
			System.out.println(cust.getLastName());
			System.out.println(cust.getCustomerType());
		} catch (javax.naming.NamingException ne) {
			ne.printStackTrace();
		}
	}
 
	public static Context getInitialContext()
			throws javax.naming.NamingException {
		return new javax.naming.InitialContext();
	}
}

jndi.properties

1
2
3

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=127.0.0.1:1099

TravelAgentRemote.java

1
2
3
4
5
6
7
8
9
10

package com.titan.travelagent;
 
import javax.ejb.Remote;
import com.titan.domain.Customer;
 
@Remote
public interface TravelAgentRemote {
	public int createCustomer(Customer cabin);
	public Customer findCustomer(int id);
}

TravelAgentBean.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

package com.titan.travelagent;
 
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import com.titan.domain.Customer;
 
@Stateless
public class TravelAgentBean implements TravelAgentRemote {
 
	@PersistenceContext (unitName="titan") private EntityManager manager;
 
	public int createCustomer(Customer customer) {
		manager.persist(customer);
		return customer.getId();
	}
 
	public Customer findCustomer(int pKey) {
		return manager.find(Customer.class, pKey);
	}
}

Customer.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

package com.titan.domain;
 
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
 
@Entity
@Table(name="CUSTOMER_TABLE")
public class Customer implements java.io.Serializable {
	private int id;
	private String lastName;
	private String firstName;
	private CustomerType customerType;
	private Date timeCreated = new Date();
	private JPEG picture;
 
	@Id
	@GeneratedValue
	@Column(name="CUST_ID")
	public int getId(){return id;}
	public void setId(int pk) {id = pk;}
 
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
 
	public String getFirstName() {
		return firstName; 
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName; 
	}
 
	@Enumerated(EnumType.STRING)
	public CustomerType getCustomerType() { return customerType;}
	public void setCustomerType(CustomerType customerType) {this.customerType = customerType;}
 
	@Temporal(TemporalType.TIME)
	public Date getTimeCreated(){ return timeCreated; }
	public void setTimeCreated(Date time) { timeCreated = time; }
 
	@Lob @Basic(fetch=FetchType.LAZY)
	public JPEG getPicture() { return picture; }
	public void setPicture(JPEG jpeg) { picture = jpeg;}
}

CustomerType.java

1
2
3
4
5
6
7

package com.titan.domain;
 
public enum CustomerType {
		UNREGISTERED,
		REGISTERED,
		BIG_SPENDAH
}

JPEG.java

1
2
3
4
5

package com.titan.domain;
 
public class JPEG implements java.io.Serializable {
	public JPEG() {}
}

persistence.xml

1
2
3
4
5
6
7
8
9
10

<?xml version="1.0" encoding="UTF-8"?>
<persistence:persistence version="1.0" xmlns:persistence="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd ">
  <persistence:persistence-unit name="titan" transaction-type="JTA">
    <persistence:description>Chapter: 6</persistence:description>
    <persistence:jta-data-source>java:/TitanDB</persistence:jta-data-source>
    <persistence:properties>
    	<persistence:property name="hibernate.hbm2ddl.auto" value="create"/>
    </persistence:properties>
  </persistence:persistence-unit>
</persistence:persistence>

application.xml

1
2
3
4
5
6
7
8
9
10
11
12
13

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC
	"-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN"
	"http://java.sun.com/dtd/application_1_3.dtd">
<application>
	<display-name>TitanCruisesExample</display-name>
	<module>
		<ejb>TravelAgentBean.jar</ejb>
	</module>
	<module>
		<ejb>Customer.jar</ejb>
	</module>
</application>

Data Source file : postgres-TitanDB-ds.xml

1
2
3
4
5
6
7
8
9
10
11
12
13
14

<?xml version="1.0" encoding="UTF-8"?>
<datasources>
  <local-tx-datasource>
    <jndi-name>java:/TitanDB</jndi-name>
	<use-java-context>true</use-java-context>
    <connection-url>jdbc:postgresql://127.0.0.1:5432/ejb3db</connection-url>
    <driver-class>org.postgresql.Driver</driver-class>
    <user-name>ranjan</user-name>
    <password>ranjan</password>
      <metadata>
         <type-mapping>PostgreSQL 8.0</type-mapping>
      </metadata>
  </local-tx-datasource>
</datasources>

Building the application: build.xml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

<?xml version="1.0" encoding="UTF-8"?>
<project name="Packaging Generator" default="_packaging_generation_">
	<target name="_packaging_generation_" depends="TitanCruisesExample" />
	<target name="TitanCruisesExample" description="TitanCruises.ear" depends="TravelAgentBean">
		<jar destfile="TitanCruises.ear">
			<zipfileset dir="conf" prefix="META-INF">
				<include name="application.xml" />
			</zipfileset>
			<zipfileset dir="/home/ranjan/workspaceEJB3/TitanCruises6">
				<include name="TravelAgentBean.jar" />
				<include name="Customer.jar" />
			</zipfileset>
		</jar>
	</target>
	<target name="TravelAgentBean" description="TravelAgentBean.jar" depends="Customer">
		<jar destfile="TravelAgentBean.jar">
			<zipfileset dir="/home/ranjan/workspaceEJB3/TitanCruises6/bin/com/titan/travelagent" prefix="com/titan/travelagent">
				<include name="TravelAgentRemote.class"/>
				<include name="TravelAgentBean.class"/>
			</zipfileset>	
		</jar>
	</target>
	<target name="Customer" description="Customer.jar">
		<jar destfile="Customer.jar">
			<zipfileset dir="conf" prefix="META-INF">
				<include name="persistence.xml" />
			</zipfileset>
			<zipfileset dir="/home/ranjan/workspaceEJB3/TitanCruises6/bin/com/titan/domain" prefix="com/titan/domain"/>
		</jar>
	</target>
</project>

Packaging Structure

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

TitanCruises.ear
  |
  |--- META-INF
  |     |
  |     |--- application.xml
  |     |
  |     |--- MENIFEST.MF
  |
  |--- Customer.jar
  |     |
  |     |--- META-INF 
  |     |     |
  |     |     |--- persistence.xml
  |     |     |    
  |     |     |--- MENIFEST.MF
  |     |
  |     |--- com
  |           |
  |           |--- titan
  |                  |
  |                  |--- domain
  |                         |
  |                         |--- Customer.class
  |                         |--- CustomerType.class
  |                         |--- JPEG.class
  |
  |--- TravelAgentBean.jar
  |     |
  |     |--- META-INF 
  |     |     |
  |     |     |--- MENIFEST.MF
  |     |
  |     |--- com
  |            |
  |            |--- titan
  |                  |
  |                  |--- travelagent
  |                         |
  |                         |
  |                         |--- TravelAgentRemote.class
  |                         |
  |                         |--- TravelAgentBean.class

Server Console after successful deployment of the application

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77

11:59:05,069 INFO  [JBossASKernel] Created KernelDeployment for: Customer.jar
11:59:05,074 INFO  [JBossASKernel] installing bean: persistence.units:ear=TitanCruises.ear,unitName=titan
11:59:05,074 INFO  [JBossASKernel]   with dependencies:
11:59:05,074 INFO  [JBossASKernel]   and demands:
11:59:05,074 INFO  [JBossASKernel]      jboss.jca:name=TitanDB,service=DataSourceBinding
11:59:05,074 INFO  [JBossASKernel]   and supplies:
11:59:05,075 INFO  [JBossASKernel]      persistence.units:unitName=titan
11:59:05,075 INFO  [JBossASKernel] Added bean(persistence.units:ear=TitanCruises.ear,unitName=titan) to KernelDeployment of: Customer.jar
11:59:05,165 INFO  [STDOUT] ======> Creating interceptor metadata bridge
11:59:05,566 INFO  [JBossASKernel] Created KernelDeployment for: TravelAgentBean.jar
11:59:05,566 INFO  [JBossASKernel] installing bean: jboss.j2ee:ear=TitanCruises.ear,jar=TravelAgentBean.jar,name=TravelAgentBean,service=EJB3
11:59:05,566 INFO  [JBossASKernel]   with dependencies:
11:59:05,566 INFO  [JBossASKernel]   and demands:
11:59:05,566 INFO  [JBossASKernel]      persistence.units:ear=TitanCruises.ear,unitName=titan
11:59:05,566 INFO  [JBossASKernel]      jboss.ejb:service=EJBTimerService
11:59:05,567 INFO  [JBossASKernel]   and supplies:
11:59:05,567 INFO  [JBossASKernel]      jndi:TitanCruises/TravelAgentBean/remote
11:59:05,567 INFO  [JBossASKernel]      jndi:TravelAgentBean
11:59:05,567 INFO  [JBossASKernel]      Class:com.titan.travelagent.TravelAgentRemote
11:59:05,567 INFO  [JBossASKernel]      jndi:TitanCruises/TravelAgentBean/remote-com.titan.travelagent.TravelAgentRemote
11:59:05,567 INFO  [JBossASKernel] Added bean(jboss.j2ee:ear=TitanCruises.ear,jar=TravelAgentBean.jar,name=TravelAgentBean,service=EJB3) to KernelDeployment of: TravelAgentBean.jar
11:59:05,598 INFO  [PersistenceUnitDeployment] Starting persistence unit persistence.units:ear=TitanCruises.ear,unitName=titan
11:59:05,693 INFO  [Version] Hibernate Annotations 3.4.0.CR1
11:59:05,729 INFO  [Environment] Hibernate 3.3.0.CR1
11:59:05,738 INFO  [Environment] hibernate.properties not found
11:59:05,745 INFO  [Environment] Bytecode provider name : javassist
11:59:05,758 INFO  [Environment] using JDK 1.4 java.sql.Timestamp handling
11:59:05,980 INFO  [Version] Hibernate Commons Annotations 3.1.0.CR1
11:59:05,987 INFO  [Version] Hibernate EntityManager 3.4.0.CR1
11:59:06,092 WARN  [Ejb3Configuration] Persistence provider caller does not implement the EJB3 spec correctly. PersistenceUnitInfo.getNewTempClassLoader() is null.
11:59:06,246 INFO  [AnnotationBinder] Binding entity from annotated class: com.titan.domain.Customer
11:59:06,328 INFO  [EntityBinder] Bind entity com.titan.domain.Customer on table CUSTOMER_TABLE
11:59:06,458 INFO  [Version] Hibernate Validator 3.1.0.CR1
11:59:06,729 INFO  [ConnectionProviderFactory] Initializing connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
11:59:06,733 INFO  [InjectedDataSourceConnectionProvider] Using provided datasource
11:59:06,958 INFO  [SettingsFactory] RDBMS: PostgreSQL, version: 8.1.11
11:59:06,958 INFO  [SettingsFactory] JDBC driver: PostgreSQL Native Driver, version: PostgreSQL 8.1 JDBC3 with SSL (build 412)
11:59:07,537 INFO  [Dialect] Using dialect: org.hibernate.dialect.PostgreSQLDialect
11:59:07,553 INFO  [TransactionFactoryFactory] Transaction strategy: org.hibernate.ejb.transaction.JoinableCMTTransactionFactory
11:59:07,560 INFO  [TransactionManagerLookupFactory] instantiating TransactionManagerLookup: org.hibernate.transaction.JBossTransactionManagerLookup
11:59:07,567 INFO  [TransactionManagerLookupFactory] instantiated TransactionManagerLookup
11:59:07,567 INFO  [SettingsFactory] Automatic flush during beforeCompletion(): disabled
11:59:07,567 INFO  [SettingsFactory] Automatic session close at end of transaction: disabled
11:59:07,568 INFO  [SettingsFactory] JDBC batch size: 15
11:59:07,568 INFO  [SettingsFactory] JDBC batch updates for versioned data: disabled
11:59:07,570 INFO  [SettingsFactory] Scrollable result sets: enabled
11:59:07,570 INFO  [SettingsFactory] JDBC3 getGeneratedKeys(): disabled
11:59:07,570 INFO  [SettingsFactory] Connection release mode: auto
11:59:07,573 INFO  [SettingsFactory] Default batch fetch size: 1
11:59:07,573 INFO  [SettingsFactory] Generate SQL with comments: disabled
11:59:07,573 INFO  [SettingsFactory] Order SQL updates by primary key: disabled
11:59:07,573 INFO  [SettingsFactory] Order SQL inserts for batching: disabled
11:59:07,573 INFO  [SettingsFactory] Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
11:59:07,584 INFO  [ASTQueryTranslatorFactory] Using ASTQueryTranslatorFactory
11:59:07,584 INFO  [SettingsFactory] Query language substitutions: {}
11:59:07,584 INFO  [SettingsFactory] JPA-QL strict compliance: enabled
11:59:07,584 INFO  [SettingsFactory] Second-level cache: enabled
11:59:07,584 INFO  [SettingsFactory] Query cache: disabled
11:59:07,607 INFO  [SettingsFactory] Cache region factory : org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge
11:59:07,607 INFO  [RegionFactoryCacheProviderBridge] Cache provider: org.hibernate.cache.HashtableCacheProvider
11:59:07,612 INFO  [SettingsFactory] Optimize cache for minimal puts: disabled
11:59:07,612 INFO  [SettingsFactory] Cache region prefix: TitanCruises_ear,titan
11:59:07,612 INFO  [SettingsFactory] Structured second-level cache entries: disabled
11:59:07,635 INFO  [SettingsFactory] Statistics: disabled
11:59:07,635 INFO  [SettingsFactory] Deleted entity synthetic identifier rollback: disabled
11:59:07,637 INFO  [SettingsFactory] Default entity-mode: pojo
11:59:07,637 INFO  [SettingsFactory] Named query checking : enabled
11:59:07,731 INFO  [SessionFactoryImpl] building session factory
11:59:08,201 INFO  [SessionFactoryObjectFactory] Factory name: persistence.units:ear=TitanCruises.ear,unitName=titan
11:59:08,204 INFO  [NamingHelper] JNDI InitialContext properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces}
11:59:08,209 INFO  [SessionFactoryObjectFactory] Bound factory to JNDI name: persistence.units:ear=TitanCruises.ear,unitName=titan
11:59:08,209 WARN  [SessionFactoryObjectFactory] InitialContext did not implement EventContext
11:59:08,235 INFO  [SchemaExport] Running hbm2ddl schema export
11:59:08,237 INFO  [SchemaExport] exporting generated schema to database
11:59:08,260 INFO  [SchemaExport] schema export complete
11:59:08,260 INFO  [NamingHelper] JNDI InitialContext properties:{java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory, java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces}
11:59:08,698 INFO  [EJBContainer] STARTED EJB: com.titan.travelagent.TravelAgentBean ejbName: TravelAgentBean

Client’s Console after running the Client.java

1
2
3

Bill
Burke
BIG_SPENDAH

References:

“Java Persistence with Hibernate” by Christian Bauer and Gavin King.
“Enterprise JavaBeans 3.0″ by Bill Burke & Richard Monson-Haefel
JBoss Documentations for EJB 3

Share This Post
Posted in JBoss, Java / Java EE

2 Responses to “EJB3: Mapping Persistent Objects Example 1”

  1. ramu Says:
    October 23rd, 2008 at 7:47 am

    Hi ranjan,
    I am in great trouble i am new to ejb3.0 .i am using jboss server 4.2 . while doing mapping in ejb3.0, i am getting folowing exceptions.org.hibernate.annotation exception.how to run mappings in ejb3.0 on jboss4.2.please help me.
    Thank u
    K.Ramu

  2. admin Says:
    October 23rd, 2008 at 11:22 pm

    @Ramu
    See, how the EJB 3.0 works, is same whether you are on 4.2 or 5.x. The only difference is that where you find the libraries and the way it is packaged. In JBoss 4.x, the packaging is not standard. Even mappings are not specific to the server version. I guess the problem you are facing is related to libraries.

Leave a Reply