Call Hazelcast Map to use Transaction from EJB client (Web Application) not work

[Cidy Long]

Environment: 

Payara 5.2021.5 community edit, 

OS: Centos 8

I'm trying to access Hazelcast map from Web Application.

1. Entity bean JPA persistence.xml as:

......

<persistence-unit name="PG12_OZSSC_JTAPU" transaction-type="JTA">

   <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

   <jta-data-source>jdbc/PG12_ozssc_105</jta-data-source>

   <class>com.longz.thss.jpa.entity.Abn</class>

   <class>com.longz.thss.jpa.entity.Address</class>

......

<properties>

</properties>

</persistence-unit>

2. Hazelcast map MapStore coded with:

......

private static final String JTA_PU_NAME = "PG12_OZSSC_JTAPU";

   @PersistenceUnit(unitName = JTA_PU_NAME)

   private EntityManagerFactory emf;

   @PersistenceContext(unitName = JTA_PU_NAME)

   private EntityManager em;

@Override

public synchronized void store(String s, Address address) {

   if(!em.isJoinedToTransaction()){

           em.joinTransaction();

   }

       storeEntityToDB(address);

       em.flush();

}

protected void storeEntityToDB(Address entity){

       Address exist = em.find(Address.class,entity.getAddressId());

       if (exist != null){

           if (!entity.equals(exist)){

               em.merge(entity);

           }

       }else{

           em.persist(entity);

       }

   }

......

3. map configure in hazelcast-config.xml as

......

<map name="address">

       <time-to-live-seconds>5400</time-to-live-seconds>

       <max-idle-seconds>3600</max-idle-seconds>

       <in-memory-format>OBJECT</in-memory-format>

       <backup-count>1</backup-count>

       <async-backup-count>0</async-backup-count>

       <read-backup-data>true</read-backup-data>

       <map-store enabled="true" initial-mode="EAGER">

           <class-name>com.longz.thss.jpa.mapstore.AddressMapStore</class-name>

           <write-delay-seconds>0</write-delay-seconds>

           <!-- <write-batch-size>100</write-batch-size> -->

           <write-coalescing>false</write-coalescing>

       </map-store>

   </map>

......

4. map access by load(),loadAll() etc. over hazelcast instance properly

5. Build a EJB module with remote interface, and implements the remote

- Remote interface as:

......

@Remote

public interface AddressRemote {

   void save(Address address);

   void remove(Address address);

}

......

- Remote impleements as:

......

@Remote(AddressRemote.class)

@Startup

@Singleton(name = "addressEJB",mappedName = "EJBModule-EJB-addressEJB")

public class AddressRemoteImpl implements AddressRemote, Serializable {

......

@PostConstruct

   public void init(){

       if(hzInstance != null){

           addressMap = hzInstance.getMap(ADDRESS_MAP_NAME);

       }

   }

@Override

   public void save(Address address) {

       if(addressMap != null){

           addressMap.put(address.getAddressId(),address);

       }else{

           try {

               throw new NotFoundException("Address Map not fund from Address EJB implementation.");

           } catch (NotFoundException e) {

               e.printStackTrace();

           }

       }

   }

......

}

5. When I tried to call the EJB services from Web Applicaiton

JSF web controller as:

@Named(value = "addressHostWebController")

@SessionScoped

@DependsOn("geoPlaceEJB")

public class AddressHostWebController implements Serializable {

.......

public String saveEntity(){

       addressRemote.save(addressBean.getCurrentAddress());

       addressBean.findAll();

       return LIST_ADDRESS;

   }

.......

}

when call controller's save()function to save an address to map

(As hazelcast-config.xml defined, the once map entry was updated, Hazelcast will write through to database straight way)

But, unfortunately, javax.persistence.TransactionRequiredException: throws as:

[2021-08-26T11:18:18.051+1000] [Payara 5.2021.5] [WARNING] [] [javax.enterprise.web] [tid: _ThreadID=100 _ThreadName=http-thread-pool::http-listener-1(3)] [timeMillis: 1629940698051] [levelValue: 900] [[

 StandardWrapperValve[Faces Servlet]: Servlet.service() for servlet Faces Servlet threw exception

javax.persistence.TransactionRequiredException: 

Exception Description: No externally managed transaction is currently active for this thread

at org.eclipse.persistence.internal.jpa.transaction.JTATransactionWrapper.throwCheckTransactionFailedException(JTATransactionWrapper.java:96)

.......

Seems, save() function caller (web application) not enabled to use JPA's entityManager's transactions? or I had some persistence.xml configure missed? or some thing else?