EL-Accessors-NPE-ISSUE

sessions.xml

<?xml version="1.0" encoding="UTF-8"?>
<sessions version="4.5" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <session xsi:type="server-session">
      <name>TLResrLogin</name>
      <event-listener-classes/>
      <primary-project xsi:type="class">TLResrLogin</primary-project>
      <login xsi:type="database-login">
         <platform-class>org.eclipse.persistence.platform.database.OraclePlatform</platform-class>
         <password>XXX</password>
         <external-connection-pooling>true</external-connection-pooling>
         <sequencing>
            <default-sequence xsi:type="native-sequence">
               <name>Native</name>
               <preallocation-size>1</preallocation-size>
            </default-sequence>
         </sequencing>
         <datasource lookup="string">java:comp/env/jdbc/TropicsRESRDS</datasource>
         <bind-all-parameters>true</bind-all-parameters>
         <byte-array-binding>false</byte-array-binding>
		 <string-binding>true</string-binding>
         <optimize-data-conversion>false</optimize-data-conversion>
         <trim-strings>false</trim-strings>
         <batch-writing>false</batch-writing>
         <jdbc-batch-writing>false</jdbc-batch-writing>
      </login>
      <connection-pools>
         <read-connection-pool>
            <name>ReadConnectionPool</name>
            <exclusive>false</exclusive>
         </read-connection-pool>
         <write-connection-pool>
            <name>default</name>
         </write-connection-pool>
      </connection-pools>
      <connection-policy/>
   </session>
</sessions>

TLRervBooking.java

public class TLRervBooking extends AbstractEclipselinkMapping {

   private static final long serialVersionUID = 343534554893735L;

   public TLResrBooking(Project parentProject) {
       parentProject.addDescriptor(buildBookingDescriptor());
   }

   public RelationalDescriptor buildBookingDescriptor() {
       ExpressionBuilder expBuilder = new ExpressionBuilder();

       RelationalDescriptor descriptor = new RelationalDescriptor();
       descriptor.setJavaClass(Booking.class);
       descriptor.addTableName("RS_TKT_BOOKING");
       descriptor.addPrimaryKeyFieldName("RS_TKT_BOOKING.RS_BKG_ID");

       // RelationalDescriptor properties.
       setClusterConfiguration(descriptor); // setCacheSynchronizationType to descriptor as ClassDescriptor.SEND_NEW_OBJECTS_WITH_CHANGES
       specifyIdentityMapClass(descriptor); // calls descriptor.useSoftCacheWeakIdentityMap();
       descriptor.setIdentityMapSize(100);
       descriptor.useRemoteSoftCacheWeakIdentityMap();
       descriptor.setRemoteIdentityMapSize(100);
       descriptor.setSequenceNumberFieldName("RS_TKT_BOOKING.RS_BKG_ID");
       descriptor.setSequenceNumberName("RS_TKT_BKG_SEQ");


       VersionLockingPolicy lockingPolicy = new VersionLockingPolicy();
       lockingPolicy.setWriteLockFieldName("RS_BOOKING.CONCURRENCYCOUNTER");
       lockingPolicy.storeInObject();
       descriptor.setOptimisticLockingPolicy(lockingPolicy);

       descriptor.setAlias("Booking");

       // Query manager.
       descriptor.getDescriptorQueryManager().checkCacheForDoesExist();
       //Named Queries

       // Event manager.
       descriptor.getDescriptorEventManager().setPreInsertSelector("aboutToUpdate");
       descriptor.getDescriptorEventManager().setAboutToUpdateSelector("aboutToUpdate");
       
       //mappings
       DirectToFieldMapping bkgIDMapping = new DirectToFieldMapping();
       bkgIDMapping.setAttributeName("bkgID");
       bkgIDMapping.setFieldName("RS_TKT_BOOKING.RS_BKG_ID");
       descriptor.addMapping(bkgIDMapping);
   }
}

TLResrLogin.java

public class TLResrLogin extends org.eclipse.persistence.sessions.Project 
{
	public TLResrLogin() 
	{
		setName("ResrLogin");
	}

}