Creating EJB 3.0 Entity Relationships - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 238

msdn_features.setSectionName("FEATURES");
em.persist(msdn_features);
em.merge(edition);
edition.addSection(msdn_features);
Add an article to the features section:
article = new Article(msdn_features);
article.setId(5012009);
article.setTitle("Data Services");
em.persist(article);
em.merge(msdn_features);
msdn_features.addArticle(article);
em.flush();
Add another article to the features section:
article = new Article(msdn_features);
article.setId(5022009);
article.setTitle("SOA Simplified");
em.persist(article);
msdn_features.addArticle(article);
em.flush();
columns = new Section();
columns.setId("MSDN_Mag_Columns_052009");
columns.setSectionName("COLUMNS");
em.persist(columns);
em.merge(edition);
edition.addSection(columns);
Add an article to the columns section:
article = new Article(columns);
article.setId(5032009);
article.setTitle("Extreme ASP.NET");
em.persist(article);
em.merge(columns);
columns.addArticle(article);
em.flush();
Add an article to the columns section:
article = new Article(columns);
article.setId(5042009);
article.setTitle("Patterns and Practices");