Hi,
I'm experiencing antoher problem when trying to call a method of a stateless
session-bean from a servlet. The session-bean has the following method:
|
| @Stateless (mappedName="ArticleManager")
| public class ArticleManager implements ArticleManagerRemote,
ArticleManagerLocal {
| @PersistenceContext
(unitName="texaco",type=PersistenceContextType.TRANSACTION) EntityManager em;
|
| @TransactionAttribute(TransactionAttributeType.REQUIRED)
| public Article testArticles(int i){
| Article article=em.find(Article.class, 1);
| System.out.println("*********** Article name" +
article.getArticle_name());
| return article;
| }
| }
|
|
This method is called from the servlet; the session-bean is injected:
| public class TestServlet extends HttpServlet {
| private @EJB ArticleManagerLocal artman;
| public void doGet(HttpServletRequest req, HttpServletResponse res)
| throws ServletException, IOException{
| try {
| Article article=artman.testArticles(1);
| PrintWriter out=res.getWriter();
| out.print("<HTML>");
| out.print(article.getArticle_name());
| out.print("</HTML>");
| out.println("Hello, world said davy!");
| out.close();
| } catch (Exception ex){
| System.out.println(ex.printStackTrace());
| }
| }
| }
|
When I try to call the testArticles method, I'm fetching an article from the
underlying mysql-database. In the testArticles()-method itself, the name of the
article with id="1" is printed correctly, but in the final stage of the
method-call, I get the following error-message:
| 2007-07-22 17:05:28,906 INFO [STDOUT] *********** Article namecoca cola
| 2007-07-22 17:05:28,906 DEBUG
[org.hibernate.event.def.AbstractFlushingEventListener] processing flush-time
cascades
| 2007-07-22 17:05:28,921 DEBUG
[org.hibernate.event.def.AbstractFlushingEventListener] dirty checking
collections
| 2007-07-22 17:05:28,968 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl]
mark transaction for rollback
| 2007-07-22 17:05:28,968 DEBUG
[org.jboss.ejb3.entity.ManagedEntityManagerFactory] ************** closing
entity managersession **************
| 2007-07-22 17:05:29,031 ERROR
[org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/texaco_webapp].[hello]]
Servlet.service() for servlet hello threw exception
| java.lang.RuntimeException: javax.transaction.RollbackException
| at
org.jboss.aspects.tx.TxPolicy.handleEndTransactionException(TxPolicy.java:198)
| at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:180)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
|
As one can see: the name of the article itself is fetched correct, but as soon
as the article is returned to the servlet, I get that horrible
javax.transaction.RollbackException. Also interesting might be the "root cause"
of the problem:
| javax.transaction.RollbackException
|
com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1192)
|
com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:134)
|
com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87
| etc.
|
I use MySQL 5.0.41, Jboss-5.0.0-Beta2 and mysql-connection-java-5.0.6. Is it
possible the warning at startup: The locking scheme is NONE instead of
READ_COMMITTED is set, has something to do with this? And in which
configuration-file can I change that setting eventually?
Once again,
thanks for possible answers!
Davy.
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