Creating EJB 3.0 Entity Relationships - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 234

Add another article to the technology section:
article = new Article(technology);
article.setId(42009);
article.setTitle("Encrypting Tablespaces");
em.persist(article);
technology.addArticle(article);
em.flush();
Add an article to the Developer section:
Section developer = new Section();
developer.setId("Oracle_Mag_Dev_022009");
developer.setSectionName("Developer");
em.persist(developer);
em.merge(edition);
edition.addSection(developer);
article = new Article(developer);
article.setId(52009);
article.setTitle("Easier Interactive Data Entry");
em.persist(article);
em.merge(developer);
developer.addArticle(article);
em.flush();
Add another article to the developer section.
article = new Article(developer);
article.setId(62009);
article.setTitle("Easy Application Attachments");
em.persist(article);
developer.addArticle(article);
em.flush();
edition = new Edition();
edition.setId(3042009);
edition.setEdition("March/April 2009");
em.persist(edition);
em.merge(catalog1);
catalog1.addEdition(edition);
features = new Section();
features.setId("Oracle_Mag_Features_042009");
features.setSectionName("FEATURES");
em.persist(features);
em.merge(edition);
edition.addSection(features);