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   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.camel.component.jpa;
  
  import java.util.List;
  
  import org.apache.camel.examples.Address;
  import org.apache.camel.examples.Customer;
  import org.junit.jupiter.api.Test;
  import org.springframework.transaction.TransactionStatus;
  import org.springframework.transaction.support.TransactionCallback;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  public class JpaUseMergeTest extends AbstractJpaMethodTest {
  
      @Override
      public boolean usePersist() {
          return false;
      }
  
      @Test
      public void produceExistingEntity() throws Exception {
          setUp("jpa://" + Customer.class.getName() + "?usePersist=false");
  
          final Customer customer = createDefaultCustomer();
          transactionTemplate.execute(new TransactionCallback<Object>() {
              public Object doInTransaction(TransactionStatus status) {
                  entityManager.joinTransaction();
                  entityManager.persist(customer);
                  entityManager.flush();
                  return null;
              }
          });
  
          assertEntitiesInDatabase(1, Customer.class.getName());
          assertEntitiesInDatabase(1, Address.class.getName());
  
          // do detach the persisted entity first before modifying it as we intend to merge it later on below
          entityManager.detach(customer);
          customer.setName("Max Mustermann");
          customer.getAddress().setAddressLine1("Musterstr. 1");
          customer.getAddress().setAddressLine2("11111 Enterhausen");
  
          Customer receivedCustomer = template.requestBody(endpoint, customer, Customer.class);
  
          assertEquals(customer.getName(), receivedCustomer.getName());
          assertNotNull(receivedCustomer.getId());
          assertEquals(customer.getAddress().getAddressLine1(), receivedCustomer.getAddress().getAddressLine1());
          assertEquals(customer.getAddress().getAddressLine2(), receivedCustomer.getAddress().getAddressLine2());
          assertNotNull(receivedCustomer.getAddress().getId());
  
          List<?> results = entityManager.createQuery("select o from " + Customer.class.getName() + " o").getResultList();
          assertEquals(1, results.size());
          Customer persistedCustomer = (Customer) results.get(0);
          assertEquals(receivedCustomer.getName(), persistedCustomer.getName());
          assertEquals(receivedCustomer.getId(), persistedCustomer.getId());
          assertEquals(receivedCustomer.getAddress().getAddressLine1(), persistedCustomer.getAddress().getAddressLine1());
          assertEquals(receivedCustomer.getAddress().getAddressLine2(), persistedCustomer.getAddress().getAddressLine2());
          assertEquals(receivedCustomer.getAddress().getId(), persistedCustomer.getAddress().getId());
      }
  }
  