[JBoss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Re: EJB3/EntityManager/Transactions and LazyInitializationEx
I was hoping jboss would start the transaction for me, when my http request
happened, and then close it when it was done. But no go. So I wrote the
servlet filter below, and it all works. I just hoped the container would take
care of it for me. Maybe in the future, when we have more time, I will try out
Seam.
| public class TransactionFilter implements Filter {
|FilterConfig config = null;
|
| public void init(FilterConfig arg0) throws ServletException {
|config=arg0;
| }
|
| public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
|
| InitialContext ctx;
| UserTransaction ut = null;
| try {
| ctx = new InitialContext();
| ut = (UserTransaction) ctx.lookup("UserTransaction");
| if(Status.STATUS_NO_TRANSACTION == ut.getStatus()) {
| ut.begin();
| } else {
| ut = null;
| }
| } catch (Exception e) {
| config.getServletContext().log("Error getting context and
beginning transaction", e);
| }
|
|
| try {
| chain.doFilter(request, response);
| if((ut != null) && (Status.STATUS_ACTIVE == ut.getStatus())) {
| ut.commit();
| }
| } catch (Exception e) {
| config.getServletContext().log("Error in filter or commit", e);
| try {
| if((ut != null && (Status.STATUS_ACTIVE == ut.getStatus( {
|ut.rollback();
| }
| } catch (Exception e1) {
| config.getServletContext().log("Error rolling back exception",
e1);
| }
| } finally {
|
| }
|}
|
| public void destroy() {
| }
| }
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[JBoss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Re: EJB3/EntityManager/Transactions and LazyInitializationEx
"tefron" wrote : don't close your session, and if you do, just call update into a new session before you acceess a lazy property... That's just it, I don't want to close the transaction, but when I leave the ejb, the transaction is closed for me. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3949621#3949621 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3949621 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [Persistence, JBoss/CMP, Hibernate, Database] - EJB3/EntityManager/Transactions and LazyInitializationExcept
So I implemented an stateless session bean which in turn uses an entity
manager. Under that is hibernate. I am once again trying to answer the age
old question of how do I get around the LazyInitializationException.
The code in my struts action looks like this:
| PetServiceInterface psi = null;
| try {
| InitialContext ctx = new InitialContext();
| psi = (PetServiceInterface) ctx.lookup("PetService/local");
| } catch (Exception e) {
| e.printStackTrace();
| }
|
| Person customer = psi.findPerson(12);
| OwnerForm of = (OwnerForm) form;
| of.setName(customer.getName());
| of.setAge(customer.getAge());
| of.setPets(customer.getPets());
|
| return (mapping.findForward("page"));
My ejb looks like this:
@Service(objectName = "whatever:service=PetService")
| @Stateless
| public class PetService implements PetServiceInterface {
|
|@PersistenceContext(unitName="pet") EntityManager em;
|public Person findPerson(int id) {
| return em.find(Person.class, Integer.valueOf(id));
| }
Now in my jsp I iterate the pets on the customer which throws a
LazyInitializationException because the session is already closed.
Looking at secion 4.1.1 in
http://www.hibernate.org/hib_docs/entitymanager/reference/en/html_single/#transactions
it says this:
anonymous wrote : This is the default EJB3 persistence model in a Java EE
environment (JTA bounded, transaction-scoped persistence context); injected (or
looked up) entity managers share the same persistence context for a particular
JTA transaction. The beauty of EJB3 is that you don't have to care about that
anymore and just see data access through entity manager and demaraction of
transaction scope on session beans as completely orthogonal.
Since I'm running JBoss 4.0.4.GA.Patch1, and using EBJ3, I was hoping the
container would take care of the transactions for me. In other words, I was
hoping the servlet request then response would all be in a JTA transaction, and
the EJB would inherit that transaction, and the EntityManager would then
inherit the same one, and so on.
If I mark the ejb with:
@TransactionAttribute(TransactionAttributeType.MANDATORY)
I will get an exception because there is no transaction. So am I
missunderstanding the quore about not needing to care about the transaction, or
am I missing something in my setup to let the container manage it all for me?
Note: Everything else works in the code as long as I stay in the action. In
other words, I get a customer, set the values, and the action returns without
error as expected.
Before I was using a ServletFilter to manage the hibernate session, but I was
hoping to get rid of that code.
Any help would be greatly appreciated.
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[JBoss-user] [JBossWS] - Re: Problem installing JBossWS in JBoss AS 4.0.4 RC1
Okay, it looks like it was fixed here: jbossws-1.0.0.CR4. Now to give it a try. :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3932868#3932868 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3932868 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBossWS] - Re: Problem installing JBossWS in JBoss AS 4.0.4 RC1
Where is this fixed? 4.0.4RC1 still has this problem. Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3932857#3932857 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3932857 --- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
