Surprisingly, this (re-attaching a detached entity) is not a simple problem. First of all, you need to be very careful about holding onto entities in your session. It's too easy with JPA/Hibernate to accidentally keep the whole query resultset in memory when you think you are holding onto a single object (check with your jvisualvm). Second, since you are using Hibernate, you can re-attach an entity with (the now deprecated operation) session.lock(entity, LockMode.NONE), not absolutely sure how the latest versions behave. I've written about it at http://www.tynamo.org/tapestry-conversations+guide/, referencing this stackoverflow issue about it: https://stackoverflow.com/questions/912659/what-is-the-proper-way-to-re-attach-detached-objects-in-hibernate, make sure you read all of it. Your best bet is to only store the company id in the session and do a find() before setting the company (I know, it defeats some of the perceived user benefits of using Hibernate/JPA).
Kalle On Tue, Nov 28, 2017 at 7:55 PM, Christopher Dodunski < chrisfromtapes...@christopher.net.nz> wrote: > Hi team, > > I suspect you'll be able to answer this right off the top of your head, as > this error occurs in response to what I imagine is a very routine code > assignment: set a newly created user's company to be the same company as > that of the user doing the creating. > > > Code snippet from 'pages/user/CreateUser.java'... > > User user = new User(firstName, lastName, userName, email, > authenticator.encryptPassword(password)); > > //Set the new user's company to the same as the creator's company > user.setCompany(authenticator.getLoggedUser().getCompany()); > > crudServiceDAO.create(user); > > > The User>>Company relationship, as defined in the User entity class... > > @ManyToOne(cascade=CascadeType.ALL) > @JoinColumn(name="COMPANY_ID") > private Company company; > > > The Company>>User relationship, as defined in the Company entity class... > > @OneToMany(mappedBy="company", cascade=CascadeType.ALL) > private Collection<User> users = new ArrayList<User>(); > > > The USER table has a COMPANY_ID field, so I'd be expecting Hibernate to > create a new user with the same company ID as the user I have logged in > as. Instead, Tapestry gives the following error... > > org.apache.tapestry5.runtime.ComponentEventException > > detached entity passed to persist: com.example.harbour.entities. > Company > > > Why is this? Appreciate your help. > > Thanks, > > Chris. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > >
