jpa - EclipseLink Descriptor Customizer & History Policy and JSF. How to insert user principals in history? -

in jsf web application, use eclipselink

descriptor customizer

and

history policy

to populate history table in database. corresponding jpa entity class annotated @customizer(beans.historylesionhcustomizer.class)

the history table has same fields source table, plus 2 fields (start_date & end_date) specify start , end of operation on row. working. need populate field in history table. field called user, should populated user principals, , allow me trace user performed cud (create/update/delete) operation. thought history policy allow me add field indicating corresponding name in database , indicate object value must inserted. not case, or may not able figure how can done. in other words, along start_date , end_date, want populate user field :

facescontext.getcurrentinstance().getexternalcontext().getremoteuser();

package beans;  /**  * whenever there change on record or insert, change traced.  * @author mediterran  *   */ import javax.faces.context.facescontext; import org.eclipse.persistence.config.descriptorcustomizer; import org.eclipse.persistence.descriptors.classdescriptor; import org.eclipse.persistence.history.historypolicy;  public class historylesionhcustomizer implements descriptorcustomizer {      @override     /**      * implementation method use      */     public void customize(classdescriptor cd) throws exception {         string user = facescontext.getcurrentinstance().getexternalcontext().getremoteuser();           historypolicy policy = new historypolicy(); // instantiates new policy //policy.postupdate();         policy.usedatabasetime(); // use default database time avoid date conflict         policy.addhistorytablename("history_lesionh"); // indicate source table name         policy.addstartfieldname("start_date"); // indicate start date db column         policy.addendfieldname("end_date"); // indicate end date db column         cd.sethistorypolicy(policy); // use policy entity class used @customizer(historylesionhcustomizer.class)        } } 

any or workarounds appreciated. thanks

unfortunately historypolicy adds start , end date. can add user information entity of entitylisteners . here example. add user information each persist/update of customer table:

import javax.persistence.entitylisteners;  @entity @entitylisteners(auditlistener.class) @table(name = "customer") public class customer implements serializable {   @column(name = "user")   private string user;   // getter , setter } 

and auditlistener:

import javax.persistence.prepersist; import javax.persistence.preupdate; //...  public class auditlistener {     @prepersist     @preupdate     public void setuserinformation(object entity) {         if (entity instanceof customer) {             customer myentity = (customer) entity;             myentity.setuser(facescontext.getcurrentinstance().getexternalcontext().getremoteuser());          }     } } 

if have more 1 column needs user information, can use mappedsuperclass entity , put user column in class. let auditable entities extend mappedsuperclass , check in auditlistener if entity instance of superclass.