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copied!<p>You have to refersh entity which was returned by <code>entityManager.merge()</code> method, something like:</p> <pre><code>@Override public void refreshCollection(List<T> entityCollection){ for(T entity: entityCollection){ if(!this.getEntityManager().contains(entity)){ this.getEntityManager().refresh(this.getEntityManager().merge(entity)); } } } </code></pre> <p>This way you should get rid of <code>javax.ejb.EJBTransactionRolledbackException: Entity not managed</code> exception.</p> <p><strong>UPDATE</strong></p> <p>Maybe it's safer to return new collection:</p> <pre><code>public List<T> refreshCollection(List<T> entityCollection) { List<T> result = new ArrayList<T>(); if (entityCollection != null && !entityCollection.isEmpty()) { getEntityManager().getEntityManagerFactory().getCache().evict(entityCollection.get(0).getClass()); T mergedEntity; for (T entity : entityCollection) { mergedEntity = entityManager.merge(entity); getEntityManager().refresh(mergedEntity); result.add(mergedEntity); } } return result; } </code></pre> <p>or you can be more effective if you can access entity IDs like this:</p> <pre><code>public List<T> refreshCollection(List<T> entityCollection) { List<T> result = new ArrayList<T>(); T mergedEntity; for (T entity : entityCollection) { getEntityManager().getEntityManagerFactory().getCache().evict(entity.getClass(), entity.getId()); result.add(getEntityManager().find(entity.getClass(), entity.getId())); } return result; } </code></pre>

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