[jboss-user] [EJB3] - EntityManager.find returns null.

Joseph Hwang [http://community.jboss.org/people/aupres] created the discussion "EntityManager.find returns null." To view the discussion, visit: http://community.jboss.org/message/605376#605376 -------------------------------------------------------------- My developmet environment is   OS : Linux CentOS 5.6   JDK : JDK 1.6   JBoss : JBoss 5.1.0.GA   DB : Oracle 11g EntityManager.find method always returns null. Same source is executed good on Windows Server 2008 and SQL Server 2008. Codes are -Members.java(Entity)- package com.aaa.ejb3; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = "family") public class Members implements Serializable {     @Id     @Column(name = "EMP_ID")     private String ID;        @Column(name = "EMP_Passwd")     private String Passwd;        @Column(name = "EMP_Name")     private String Name; ....getter와 setter method.... Through STDOUT 13:48:53,875 INFO  [STDOUT] Hibernate: select members0_.EMP_ID as EMP1_2_0_, members0_.EMP_Name as EMP2_2_0_, members0_.EMP_Passwd as EMP3_2_0_ from family members0_ where members0_.EMP_ID=? 13:48:53,951 INFO  [STDOUT] null 13:48:53,952 INFO  [STDOUT] Hibernate: select members0_.EMP_ID as EMP1_2_0_, members0_.EMP_Name as EMP2_2_0_, members0_.EMP_Passwd as EMP3_2_0_ from family members0_ where members0_.EMP_ID=? SQL select is done well and there is no exception, but why EntityManager.find returns null? When I execute EntityManager.persist, insert SQL is generated and values are inserted to Oracle DB!!!! I need your advice ! Thanks in advance Best Regards -EJBLoginBean.java(Session Bean)- package com.aaa.ejb3; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EJBLoginBean implements IEJBLogin {     @PersistenceContext(unitName="MyDBTest")    EntityManager em;         public Object loginFunc(Class clazz, Object primaryKey) {         // TODO Auto-generated method stub         Object obj = em.find(clazz, primaryKey);         System.out.println(obj); // always returns null         return em.find(clazz, primaryKey);     } } - WSLoginTest.java(EJB Invocation)- @WebService public class WSLoginTest implements WSLoginTestPort {         @EJB     IEJBLogin login;     public String loginFunc(String ID, String Passwd) {         // TODO Auto-generated method stub         try {             Members member = new Members();             member = (Members)login.loginFunc(Members.class, ID); *// I tried ID.trim but failed.*                                  if( member == null )                 return "no user."; //always return this value             else if(!Passwd.equals(member.getPasswd().trim()))                 return "wrong password";                 else                     return member.toString();         }         catch(Exception e) {             return e.getMessage();         }     } } in console 13:47:37,381 INFO  [SessionFactoryObjectFactory] Factory name: persistence.unit:unitName=TotalTestEAR.ear/EJBLoginModule.jar#MyDBTest ..... 13:47:48,492 INFO  [SchemaUpdate] updating schema 13:47:57,430 INFO  [TableMetadata] table found: SCOTT.FAMILY 13:47:57,430 INFO  [TableMetadata] columns: [emp_passwd, emp_name, emp_id] JBoss recognized Entity ... There is no Exception. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/605376#605376] Start a new discussion in EJB3 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]