Thanks for the info. I looked into Spec and got a very vague idea of what's happening here. Let me test these scenarios with some samples and understand what's happening.
Thanks Phani On Mon, Jun 9, 2008 at 11:35 PM, David Jencks <[EMAIL PROTECTED]> wrote: > I looked in the spec a bit and am not sure I understand how all the parts > are meshing, maybe david blevins can chime in... I think that you've > specified contradictory information and maybe we should be complaining > rather than supplying a container managed jta EntityManager. > I _think_ that your annotation-injected EntityManager has to be container > managed and hence jta. > I _think_ that if you want a resource-local EntityManager you have to > inject the EMF with a PersistenceUnit annotation and get the EntityManager > yourself. > > In the spec, section 5.6 starts: > Whenacontainer-managedentitymanager isused, thelifecycleof > thepersistencecontext isalways > managedautomatically, transparentlytotheapplication, > andthepersistencecontextispropagatedwith > the JTA transaction. > > > I think this means that with your @PersistenceContext annotation, you are > definitely going to get a tx-type=JTA EM. Since you specified > RESOURCE_LOCAL in the persistence.xml I think we should perhaps be > objecting. > > I also think this means that you need an application managed persistence > context to get RESOURCE_LOCAL. There are a bunch of examples in section 5.7 > that all use @PersistenceUnit. > > Also hoping for clarification.... > david jencks > > On Jun 9, 2008, at 1:43 AM, Phani Madgula wrote: > > Hi, > I have tried to play with <jta-datasource> and <non-jta-datasource> as > follows. > > I have the following peristence.xml in a web application. > *********** > <?xml version="1.0" encoding="UTF-8" ?> > <persistence xmlns="http://java.sun.com/xml/ns/persistence"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="http://java.sun.com/xml/ns/persistence > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"; > version="1.0"> > > <!-- Tutorial "unit" --> > <persistence-unit name="Tutorial" transaction-type="RESOURCE_LOCAL"> > > <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> > <non-jta-data-source>ProductDS-nonJTA</non-jta-data-source> > <mapping-file>orm.xml</mapping-file> > <class>samples.jpa.Product</class> > <class>samples.jpa.Book</class> > > </persistence-unit> > > </persistence> > > *********** > > In the servlet, I have the following code > > *********** > @PersistenceContext(unitName="Tutorial") > private EntityManager em; > ..... > .... > UserTransaction ut; > try{ > Context ctx = new InitialContext(); > > //ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction"); > //ut.begin(); > > //EntityTransaction et = em.getTransaction(); > //et.begin(); > > Book book = new Book("DDDDD","John",1.0,"Joe","1934834-23823","Phani"); > em.persist(book); > > //et.commit(); > //ut.commit(); > > }catch(Exception e){ > e.printStackTrace(); > throw new ServletException (e); > } > *********************** > > 1. When I hit the servlet, I get the following error. > > *********************** > javax.persistence.TransactionRequiredException : No Active transaction > *********************** > > 2. Suppose I have the following code in the servlet > ********************** > *********** > @PersistenceContext(unitName="Tutorial") > private EntityManager em; > ..... > .... > UserTransaction ut; > try{ > Context ctx = new InitialContext(); > > //ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction"); > //ut.begin(); > > //Uncomment EntityTransaction > EntityTransaction et = em.getTransaction(); > et.begin(); > > Book book = new Book("DDDDD","John",1.0,"Joe","1934834-23823","Phani"); > em.persist(book); > > et.commit(); > //ut.commit(); > > }catch(Exception e){ > e.printStackTrace(); > throw new ServletException (e); > } > *********************** > I get the following error > *********************** > > java.lang.IllegalStateException : You can not call getTransaction on > a container managed EntityManager > > ************************* > > 3. Only if I use JTA API, I am able to get the entity persisted > properly as below. > *************************** > @PersistenceContext(unitName="Tutorial") > private EntityManager em; > ..... > .... > UserTransaction ut; > try{ > Context ctx = new InitialContext(); > > ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction"); > ut.begin(); > > > Book book = new Book("DDDDD","John",1.0,"Joe","1934834-23823","Phani"); > em.persist(book); > > > ut.commit(); > > }catch(Exception e){ > e.printStackTrace(); > throw new ServletException (e); > } > **************************** > > Please note that I am using "RESOURCE_LOCAL" persistence unit. I also > used <non-jta-datasource>. I deployed the database pool with > </no-transaction> tag in the connector deployment plan. > > My questions are > > 1. Should we always use UserTransaction object irrespective of > <jta-datasource> or <non-jta-datasource> in JEE environment?? > > 2. How is the use of <non-jta-datsource> different from the use > <jta-datasource> in JEE environment?? > > 3. In EJBs, when ContainerManaged Transactions are used, there is no > need to use JTA. Is that correct?? > > 4. Only in J2SE environments, we can use EntityTransaction object. is > that correct?? > > Thanks in advance. > Phani > > On 5/28/08, David Jencks <[EMAIL PROTECTED]> wrote: > > 1. I hope you named the file openejb-jar.xml > > 2. jta-datasource and non-jta-datasource have to contain the names of > > the datasources in the geronimo plan used for the pool, NOT some jndi > > name you might also map them to. The datasources don't need to be > > bound in jndi in order to be used for jpa > > 3. The non-jta-datasource must be a datasource that really has no > > transaction support, using the <no-transaction/> element instead of > > <local-transaction/> or <xa-transaction>... in the connector plan. > > With derby I find it necessary to have a non-jta-datasource if any ddl > > is needed or if openjpa is generating the primary keys. I don't know > > if you can get away without one for other databases. If you want to > > experiment, leave out the non-jta-datasource rather than duplicating > > the jta-datasource contents. > > > hope this helps > > david jencks > > > On May 27, 2008, at 4:09 PM, zeros wrote: > > > > Good evening: > > > I'm newbie with EJB3.0. I want to configure the persistence.xml > > to have > > entities managed with JPA. I have the next configuration files: > > OPENJPA-JAR.XML > > > <openejb-jar xmlns="http://www.openejb.org/xml/ns/openejb-jar-2.1"; > > xmlns:nam="http://geronimo.apache.org/xml/ns/naming-1.1"; > > xmlns:pkgen="http://www.openejb.org/xml/ns/pkgen-2.0"; > > xmlns:sec="http://geronimo.apache.org/xml/ns/security-1.1"; > > xmlns:sys="http://geronimo.apache.org/xml/ns/deployment-1.2";> > > <sys:environment> > > <sys:moduleId> > > <sys:groupId>o2o.marketing</sys:groupId> > > <sys:artifactId>EJB</sys:artifactId> > > <sys:version>1.0.8</sys:version> > > <sys:type>jar</sys:type> > > </sys:moduleId> > > <sys:dependencies> > > <sys:dependency> > > <sys:groupId>console.dbpool</sys:groupId> > > <sys:artifactId>marketing</sys:artifactId> > > <sys:version>1.0</sys:version> > > <sys:type>rar</sys:type> > > </sys:dependency> > > </sys:dependencies> > > </sys:environment> > > </openejb-jar> > > > And I have also persistence.xml > > > <?xml version="1.0" encoding="UTF-8"?> > > <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence > > " > > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > > xsi:schemaLocation="http://java.sun.com/xml/ns/persistence > > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";> > > <persistence-unit name="marketing"> > > <description>Entity Beans for User</description> > > > <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</ > > provider> > > <jta-data-source>java:comp/env/marketing</jta-data-source> > > <non-jta-data-source>java:comp/env/marketing</non-jta-data-source> > > <mapping-file>META-INF/orm.xml</mapping-file> > > <properties /> > > </persistence-unit> > > </persistence> > > > The error which I'm having is the next one: Unable to resolve > > reference > > "JtaDataSourceWrapper" and Unable to resolve reference > > "NonJtaDataSourceWrapper", which are basically the same error. > > > I think this is produced because I'm not mapping the Datasocurce to > > the > > DBPool. Geronimo returns to me examples to do it for web, but no > > example to > > do it for an EJB. > > > Please could you help me? > > > WATCH OUT! I'm talking about entities and EJB3.0, not entiti beans and > > EJB2.0 > > > Thanks in advance > > > SERGIO > > -- > > View this message in context: > > http://www.nabble.com/JPA%2C-entities-and-EJB3-tp17502079s134p17502079.html > > Sent from the Apache Geronimo - Users mailing list archive at > > Nabble.com. > > > > > >
