title: JPARepository is not saving @JoinColumn
body: <p>I have the following Entity Relations:</p>
  
  <pre><code>@AllArgsConstructor
  @NoArgsConstructor
  @Builder
  @Data
  @Entity
  public class BatchProcessRecord implements Serializable, Cloneable {
  
      ...
  
      @ManyToOne
      @JoinColumn(name = "batch_process_id")
      private BatchProcess batchProcess;
  }
  
  
  @AllArgsConstructor
  @NoArgsConstructor
  @Builder
  @Data
  @Entity
  public class BatchProcess implements Serializable, Cloneable {
  
      @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
      private Long id;
  
      @OneToMany(cascade = CascadeType.ALL, mappedBy = "batchProcess")
      private List&lt;BatchProcessRecord&gt; records;
  }
  </code></pre>
  
  <p>And the following code that saves the entities:</p>
  
  <pre><code>    // Create batch process
      BatchProcess batchProcess = BatchProcess.builder()
              ....
              .records(records)
              .build();
  
      // Save entity
      batchProcessRepository.save(batchProcess);
  </code></pre>
  
  <p>In the console, it generates the inserts as expected (with 2 children), but without filling <code>batch_process_id</code> (JoinColumn). </p>
  
  <p>What is happening?</p>
  
  <p>Console:</p>
  
  <pre><code>Hibernate: insert into batch_process (batch_end_date, batch_entries_count, batch_entries_with_issues, batch_name, batch_start_date, report_file_download_date, report_file_name, result_file_name, result_file_upload_date, status) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  
  Hibernate: insert into batch_process_record (address_number, batch_process_id, city, first_name, full_street_address, last_name, maternal_name, post_directional, pre_directional, reference_number, ssn, state, street_type, zip_code) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  
  Hibernate: insert into batch_process_record (address_number, batch_process_id, city, first_name, full_street_address, last_name, maternal_name, post_directional, pre_directional, reference_number, ssn, state, street_type, zip_code) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
  2
  </code></pre>
  
  <p>Repository:</p>
  
  <pre><code>public interface BatchProcessRepository extends 
  JpaRepository&lt;BatchProcess, Long&gt; {
  }
  </code></pre>