Spring @Transactional commit failures ; Deby + Eclipselink

Question

The following is the spring config

Date Source

<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
    <property name="driverClassName" value="${rwos.dataSource.driverClassName}" />
    <property name="url" value="${rwos.dataSource.url}" />
    <property name="username" value="${rwos.dataSource.user}" />
    <property name="password" value="${rwos.dataSource.password}" />
 </bean>

Entity manager config

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd">

  <bean id="persistenceUnitManager" class="org.springframework.data.jpa.support.MergingPersistenceUnitManager">
        <property name="defaultDataSource" ref="dataSource"/>
  </bean>

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="persistenceUnitManager" ref="persistenceUnitManager"/>
        <property name="persistenceUnitName" value="com.retailwave.rwos_rwos-data-pojo_jar_4.0.0PU"/>
  </bean>

  <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"  lazy-init="true">
                <property name="entityManagerFactory" ref="entityManagerFactory"/>
                <property name="dataSource" ref="dataSource" />
  </bean>
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
</beans>

The following is the code snippet used to persist entity

@Singleton
@Component
public class RWTransactionDao {

@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager em;

 @Override
protected EntityManager getEntityManager() {
    return em;
}

@Transactional
public void createOrderTxns(RWRetailTransaction peTxn, RWRetailTransaction fcTxn) {
    create(peTxn);
    create(fcTxn);
    log.debug("Committed Transaction : {} ", peTxn.displayString());
    log.debug("Committed Transaction : {} ", fcTxn.displayString());
 }

 @Transactional
 public void create(T entity) {
   getEntityManager().persist(entity);
 }

}

Class :

@Component
@Path("/")
public class RWTransactionREST {

   @Inject
   private RWTransactionDao rWTransactionDao;

  @POST
  @Produces(MediaType.APPLICATION_JSON)
  @Path("txns/sales")
  public RWResponse createPurchaseTransaction(RWRetailTransaction peTxn, RWRetailTransaction fcTxn) {
    rWTransactionDao.createOrderTxns(peTxn, fcTxn);
    builder.status(RWStatus.OK);
    RWResponse response = builder.build();
    log.info("Returning.. {}", response);
    return response; 
   }

  }

Log message:

2017-06-14 10:49:51,453 DEBUG [qtp592179046-13] - Committed Transaction : RWRetailTransaction[609, CU_ORD, RTCO-609-17-11193, 2017-06-14 10:49:51.431] 
2017-06-14 10:49:51,453 DEBUG [qtp592179046-13]  - Committed Transaction : RWRetailTransaction[509, CU_ORD, RTCO-509-17-11193, 2017-06-14 10:49:51.444]
2017-06-14 10:49:51,463 INFO  [qtp592179046-13] RWTransactionREST - Returning.. Response[1000:Order has been created successfully, Transaction Id : RTCO-609-17-11193]

After some time the following error occurred in the same RWTransactionDao in some other REST imple methods

2017-06-14 10:51:24,199 ERROR [qtp592179046-16] com.retailwave.rwos.compartment.rest.exception.RWCompartmentRestExceptionMapper - Exception caught at Mapper : Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLTransactionRollbackException: A lock could not be obtained within the time requested 

Due to this error previous commit got rolled back but it not supposed to be.

Not sure what causes for this rollback.

Answer 1

The problem was due to PersistenceContextType.EXTENDED. I did two changes and problem got resolved.

1. PersistenceContextType.EXTENDED changed to PersistenceContextType.TRANSACTION

2. @Singleton changed to @Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
   
   

   @Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
   @Component
   public class RWTransactionDao {
   
       @PersistenceContext(type = PersistenceContextType.TRANSACTION)
       private EntityManager em;
   
       @Override
       protected EntityManager getEntityManager() {
           return em;
       }
   
       @Transactional
       public void createOrderTxns(RWRetailTransaction peTxn, RWRetailTransaction fcTxn) {
           create(peTxn);
           create(fcTxn);
           log.debug("Committed Transaction : {} ", peTxn.displayString());
           log.debug("Committed Transaction : {} ", fcTxn.displayString());
       }
   
       @Transactional
       public void create(T entity) {
           getEntityManager().persist(entity);
       }