JpaPollingChannelAdapter with entity update at end - spring-integration

Question

I am working on the integration of a Vendor software that uses for interface a DB table mimicking a queue.
Here is the JPA entity representation of such table:
#Data
#Entity
#Table(name = "TASK")
public static class Task implements Serializable {
#Id
#GeneratedValue(generator = "TaskId")
#SequenceGenerator(name = "TaskId", sequenceName = "TASK_SEQ", allocationSize = 50)
#Column(name = "ID")
private BigInteger id;
private Status status;
private LocalDate processedDate;
public enum Status {
NEW, PROCESSED, ERROR
}
}
I would like to use Spring integration to poll NEW records from this table, handle them (typical use case is to transfom and post on a JMS queue), and then udpate the record with either:
status PROCESSED if everything went fine
status ERROR if an exception occured
I tried to do so with JpaExecutor + JpaPollingChannelAdapter without much success. How would you recommend to tackle this case ?
Here is how I started:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.integration.dsl.IntegrationFlows;
import org.springframework.integration.dsl.Pollers;
import org.springframework.integration.handler.GenericHandler;
import org.springframework.integration.jpa.core.JpaExecutor;
import org.springframework.integration.jpa.inbound.JpaPollingChannelAdapter;
import org.springframework.stereotype.Component;
#Component
#EnableIntegration
public class ExampleJob {
#Autowired
EntityManager entityManager;
#Bean
IntegrationFlow taskExecutorFlow() {
JpaExecutor selectExecutor = new JpaExecutor(entityManager);
selectExecutor.setJpaQuery("from Task where status = 'NEW'");
JpaPollingChannelAdapter adapter = new JpaPollingChannelAdapter(selectExecutor);
return IntegrationFlows
.from(adapter, c -> c.poller(Pollers.fixedDelay(Duration.ofMinutes(5))).autoStartup(true))
.handle((task, headers) -> task)
.get();
}

Answer 1

See a Jpa.outboundAdapter() as the next .handle() in your flow. This one is going to perform a MERGE on the entity in the message payload.
See more in docs: https://docs.spring.io/spring-integration/docs/current/reference/html/jpa.html#jpa-outbound-channel-adapter
The poller() could be configured with a transaction to have the whole flow against retrieved entity transactional.