Java/EJB3/Transaction
Содержание
- 1 Container Managed Transaction
- 2 Container Managed Transaction: Required
- 3 Container Managed Transaction: TransactionAttributeType.SUPPORTS
- 4 Inject Transaction As Resource
- 5 Mark Stateful Session Bean As Transaction Attribute Type: REQUIRES_NEW
- 6 Transaction Attribute Type: REQUIRES_NEW
- 7 Transaction Attribute Type: SUPPORTS
- 8 Transaction Management Type: BEAN
- 9 Use User Transaction In Client Side
Container Managed Transaction
<source lang="java">
File: EmployeeService.java
import java.util.Collection; import javax.annotation.Resource; import javax.ejb.Stateless; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; import javax.ejb.TransactionManagement; import javax.ejb.TransactionManagementType; import javax.naming.Context; import javax.naming.InitialContext; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.Query; import javax.transaction.UserTransaction; @Stateless public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService") EntityManager em; public EmployeeService() { } public Employee createEmployee(int id, String name, long salary, byte[] pic) { Employee emp = new Employee(id); emp.setName(name); emp.setSalary(salary); emp.setPicture(pic); em.persist(emp); emp = findEmployee(id); System.out.println(emp); return emp; } public void removeEmployee(int id) { Employee emp = findEmployee(id); if (emp != null) { em.remove(emp); } } public Employee raiseEmployeeSalary(int id, long raise) { Employee emp = em.find(Employee.class, id); if (emp != null) { emp.setSalary(emp.getSalary() + raise); } return emp; } public Employee findEmployee(int id) { return em.find(Employee.class, id); } public Collection<Employee> findAllEmployees() { Query query = em.createQuery("SELECT e FROM Employee e"); return (Collection<Employee>) query.getResultList(); } public void doAction(){ Employee emp = new Employee(1); emp.setName("name"); emp.setSalary(100); emp.setPicture("pic".getBytes()); em.persist(emp); emp = findEmployee(1); System.out.println(emp); }
}
File: EmployeeServiceLocal.java
import javax.ejb.Local; @Local public interface EmployeeServiceLocal {
public void doAction(); public Employee createEmployee(int id, String name, long salary, byte[] pic) ;
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public Employee createEmployee(int id, String name, long salary, byte[] pic) ; public void doAction();
}
File: Employee.java import static javax.persistence.FetchType.LAZY; import java.io.Serializable; import javax.persistence.Basic; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Lob; import javax.persistence.Table; @Entity //@Table(name="EMP", schema="HR") @Table(name="EMP") public class Employee implements Serializable {
@Id @Column(name = "EMP_ID") private int id; @Column(name = "COMM") private String name; @Column(name = "SAL") private long salary; @Basic(fetch=LAZY) @Lob @Column(name="PIC") private byte[] picture; public Employee() { } public Employee(int id) { this.id = id; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public long getSalary() { return salary; } public void setSalary(long salary) { this.salary = salary; } public byte[] getPicture() { return picture; } public void setPicture(byte[] picture) { this.picture = picture; } public String toString() { return "Employee id: " + getId() + " name: " + getName() + " salary: " + getSalary(); }
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote"); service.createEmployee(158, "AAA", 45000, "asdf".getBytes()); service.doAction(); }
}
</source>
Container Managed Transaction: Required
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove; @Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java
import javax.ejb.Stateless; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName = "EmployeeService") private EntityManager em;
public EmployeeBean() { } @TransactionAttribute(TransactionAttributeType.REQUIRED) public void doAction() { Employee emp = new Employee(); emp.setFirstName("first"); em.persist(emp); } public <T> T mergeEntity(T entity) { return em.merge(entity); } public <T> T persistEntity(T entity) { em.persist(entity); return entity; } public <T> T refreshEntity(T entity) { em.refresh(entity); return entity; } public void removeEntity(Object entity) { em.remove(em.merge(entity)); }
}
File: EmployeeServiceLocal.java
import javax.ejb.Local; @Local public interface EmployeeServiceLocal {
public void doAction(); <T> T mergeEntity(T entity); <T> T persistEntity(T entity); <T> T refreshEntity(T entity); void removeEntity(Object entity);
}
File: EmployeeServiceRemote.java import javax.ejb.Remote;
@Remote public interface EmployeeServiceRemote {
public void doAction(); <T> T mergeEntity(T entity); <T> T persistEntity(T entity); <T> T refreshEntity(T entity); void removeEntity(Object entity);
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new // InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
service.doAction(); }
}
</source>
Container Managed Transaction: TransactionAttributeType.SUPPORTS
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java import javax.ejb.Stateful; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; @Stateful public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
public EmployeeBean() { } @TransactionAttribute(TransactionAttributeType.SUPPORTS) public void doAction() { System.out.println("Processing..."); }
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.doAction(); }
}
</source>
Inject Transaction As Resource
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java import javax.annotation.Resource; import javax.ejb.EJBException; import javax.ejb.Stateless; import javax.ejb.TransactionManagement; import javax.ejb.TransactionManagementType; import javax.transaction.UserTransaction; @Stateless @TransactionManagement(TransactionManagementType.BEAN) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@Resource UserTransaction tx; public EmployeeBean() { } public void doAction() { try { try { tx.begin(); // do the work... System.out.println("Processing..."); } finally { tx.rumit(); } } catch (Exception e) { // handle all the tx.begin()/commit() exceptions throw new EJBException(e); } }
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.doAction(); }
}
</source>
Mark Stateful Session Bean As Transaction Attribute Type: REQUIRES_NEW
<source lang="java">
File: EmployeeBean.java import javax.ejb.Stateful; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.PersistenceContextType; @Stateful @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName = "EmployeeService", type = PersistenceContextType.EXTENDED) EntityManager em; public EmployeeBean() { } public void doAction() { System.out.println("Processing..."); }
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.doAction(); }
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
</source>
Transaction Attribute Type: REQUIRES_NEW
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java import javax.ejb.Stateless; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
public EmployeeBean() { } @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) public void doAction() { System.out.println("Processing..."); }
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.doAction(); }
}
</source>
Transaction Attribute Type: SUPPORTS
<source lang="java">
File: Employee.java import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove; @Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeService.java
import javax.ejb.Stateful; import javax.ejb.TransactionAttribute; import javax.ejb.TransactionAttributeType; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.PersistenceContextType; @Stateful @TransactionAttribute(TransactionAttributeType.SUPPORTS) public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService", type=PersistenceContextType.EXTENDED) private EntityManager entityManager; public EmployeeService() { }
public void doAction() throws Exception { Employee emp = new Employee(); emp.setId(1); entityManager.merge(emp); }
}
File: EmployeeServiceLocal.java
import java.util.Collection; import javax.ejb.Local; @Local public interface EmployeeServiceLocal {
public void doAction() throws Exception;
}
File: EmployeeServiceRemote.java
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction() throws Exception;
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import java.util.Date; import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
service.doAction(); }
}
</source>
Transaction Management Type: BEAN
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java import javax.annotation.Resource; import javax.ejb.EJBException; import javax.ejb.Stateless; import javax.ejb.TransactionManagement; import javax.ejb.TransactionManagementType; import javax.transaction.UserTransaction; @Stateless @TransactionManagement(TransactionManagementType.BEAN) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@Resource UserTransaction tx; public EmployeeBean() { } public void doAction() { try { try { tx.begin(); // do the work... System.out.println("Processing..."); } finally { tx.rumit(); } } catch (Exception e) { // handle all the tx.begin()/commit() exceptions throw new EJBException(e); } }
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.doAction(); }
}
</source>
Use User Transaction In Client Side
<source lang="java">
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove; @Entity public class Employee implements java.io.Serializable {
private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; }
@PostRemove public void postRemove() { System.out.println("@PostRemove"); } public void setId(int id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String first) { this.firstName = first; } public String getLastName() { return lastName; } public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeBean.java
import javax.annotation.Resource; import javax.ejb.Stateful; import javax.ejb.TransactionManagement; import javax.ejb.TransactionManagementType; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.PersistenceContextType; import javax.transaction.UserTransaction; @Stateful @TransactionManagement(TransactionManagementType.BEAN) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName = "EmployeeService", type = PersistenceContextType.EXTENDED) private EntityManager em; @Resource private UserTransaction ut; public EmployeeBean() { }
public void doAction() { Employee emp = new Employee(); emp.setFirstName("first"); em.persist(emp); } public <T> T mergeEntity(T entity) { return em.merge(entity); } public <T> T persistEntity(T entity) { em.persist(entity); return entity; } public <T> T refreshEntity(T entity) { em.refresh(entity); return entity; } public void removeEntity(Object entity) { em.remove(em.merge(entity)); } public void beginTrans() throws Exception { ut.begin(); } public void commitTrans() throws Exception { ut.rumit(); } public void rollbackTrans() throws Exception { ut.rollback(); }
}
File: EmployeeServiceLocal.java
import javax.ejb.Local; @Local public interface EmployeeServiceLocal {
public void doAction(); <T> T mergeEntity(T entity); <T> T persistEntity(T entity); <T> T refreshEntity(T entity); void removeEntity(Object entity); void beginTrans() throws Exception; void commitTrans() throws Exception; void rollbackTrans() throws Exception;
}
File: EmployeeServiceRemote.java import javax.ejb.Remote;
@Remote public interface EmployeeServiceRemote {
public void doAction(); <T> T mergeEntity(T entity); <T> T persistEntity(T entity); <T> T refreshEntity(T entity); void removeEntity(Object entity); void beginTrans() throws Exception; void commitTrans() throws Exception; void rollbackTrans() throws Exception;
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception { EmployeeServiceRemote service = null; // Context compEnv = (Context) new InitialContext().lookup("java:comp/env"); // service = (HelloService)new // InitialContext().lookup("java:comp/env/ejb/HelloService"); service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote"); service.beginTrans(); service.doAction(); service.rumitTrans(); }
}
</source>