Dynpro and EJB
Hi,
I want to build iviews using WebDynpro, and I need to access to a External Database.
I thing that the best way is using EJB proyect and use it as model in my WD.
I use the "simple_javabean_generator_project" script to generate the .java and I'm here...
I need a step by step to use this code and generate my EJB.
Thanks in advance.
Nacho.
Hi Nibu,George: thanks for your answer, but I can't find the solution...
This link talks about different methods and perspectives and I'm confused.
I don't know if is necessary but I created a dataSourse in Visual admin, but I don't know how to make a relation of this in my WebDympro.
In http://help.sap.com/saphelp_nw04/helpdata/en/82/fdbf2085f65f43a71e755fc904478d/frameset.htm
I can see code from this, but I can see too that ..." WebDynpro components do not support the declaration of resource references. To use a preconfigured data source, you must perform the lookup operation directly from the jdbc/ naming context, without using the prefix java:comp/env...."
And then ? How can I do to connect to my database ?
do I need to put code in my WD ? Where ?
do I need to create a separate EJB project?? How can I do this ?
Please, I read a lot of posts, helps, etc... but I need more basic information... more specific information.
Best Regards.
Nacho.
Similar Messages
-
I need to get to the sap db from my web dynpro, and I need to be able to save/retrieve/modify data.
Any idea how to approach it??
I've looked into creating ejbs but have been unsuccessful at finding an ejb document on how to create them and then use them in web dynpro.
If not, what other ways are to go about saving/retrieving data??
ThanksHey!
Try this out, it should work.. I would sugest that you use this code snipet on DAO's and put them in a java library project, and make reference to it from the web dynpro project properties so you don't have business logic on your WD Application, although it will also work in the WebDynpro if you copy/paste and customize this code
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
Connection conn = null;
try {
InitialContext dbInitContext = new InitialContext();
Properties sysProperties = System.getProperties();
String sysname = sysProperties.getProperty("SAPSYSTEMNAME");
String dbName = "jdbc/" + "SAP" + sysname + "DB";
DataSource dataSource = (DataSource) dbInitContext.lookup(dbName);
conn = dataSource.getConnection();
Statement stmtQ = conn.createStatement();
ResultSet rs = stmtQ.executeQuery( "SELECT... ");
while (rs.next()) {
//iterate query
} catch (NamingException e) {
//handle exception
} finally {
try {
conn.close();
} catch (SQLException e) {
//handle exception
Cheers,
JV
Edited by: Jesus Valencia on Aug 6, 2009 11:00 AM -
Web Dynpro and CAF (BOs, Application Services, returning Complex Types)
Hi All,
I am trying to develop an application using Web Dynpro and CAF for days now and did not get it running.. I need some help here.
What I am trying to do / have done is the following:
- Design a Business Object (BO) in CAF
- Implement an Application Service that has a method called getAllBOs that calls the findAll method of the BO
- call this method using AWS model or EJB model in Web Dnypro, show the result in a table.
My getAllBOs returns a set of BOs (Data Type is the Complex Type of my BO in CAF). I was able to design the Application Service so that it returns a collection of BOs (using a Wrapper Comple Type), but I was never able to call the generated Web Service successfully in Web Dynpro. The WebService worked fine when testing it in wsnavigator...
However, i never got it running.. is there anybody out there who is able to explain what to do to import a AWS model or an EJB model in Werb Dynpro and particularily how to implement the stuff so that it returns a set of BOs successfully...
Thanks in advance.. Useful help is highly appreciated
Please note: THIS IS ABOUT Netweaver CE 7.1 - do not post stuff about 7.0!Hi,
You have to return a single object from caf layer to webdynpro layer.
Since you are returning a list of BOs, create a wrapper in caf which contains the list of your BOs.
Your application service should return this wrapper.
Creating Wrapper:
1. Create a complex data type.
2. Include your BO as one of the properties in it. and set the cardinality to 0..n.
In Application service invoke your findAll() of BO and use the returned list to populate the wrapper's BO list.
Return this wrapper.
Hope it helps.
Regards,
Fazal -
Webdynpro and EJB on different server
I have a WebDynpro app that will be deployed to server A and that has to access an EJB that will be deployed to server B, server A and server B don't from a cluster.
I don't know how to call the EJB in my WebDynpro app via remote way.
in WebDynpro app call EJB code is:
String result = null;
Context ctx = null;
Hashtable env = new Hashtable();
PIEJB remote = null;
PIEJBHome remoteHome = null;
env.put(
Context.INITIAL_CONTEXT_FACTORY,
"com.sap.engine.services.jndi.InitialContextFactoryImpl");
env.put(Context.PROVIDER_URL, "sapides:50304");
env.put("force_remote", "true");
try {
ctx = new InitialContext(env);
remoteHome =
(PIEJBHome) PortableRemoteObject.narrow(
ctx.lookup("PIEJBBean"),
PIEJBHome.class);
remote = remoteHome.create();
result = remote.getPIAvg("yesterday", "today").getValue();
} catch (Exception e) {
result = e.toString();
wdContext.currentContextElement().setTest(result);
when run this code,report error:
java.lang.NoClassDefFoundError: com.xxx.piejb.PIEJBHome
but i have add the piejb.jar in Used DC!
can anyone tell me how to do?
thanks advance!Hi Ha
I just tested the link and it worked fine for me, if you want it, you can give an email and i'll send the pdf guide to you. Besides here you can find a guided example about calling the webserivces methods from a WD on the Using the Car Rental Web Service with Web Dynpro, and on this one you can find information about the development of a webservices using an ejb.
Hope it Helps
Luis Barragá -
Designing DCs project and EJB- What is the right thing to do?
Hi:
I have a big doubt about designing DCs project and EJB:
My presentation layer is WD and I'm going to use EJB Session and Hibernate to persist data. So I'm not complete sure how to model it at project level (I'm new on DCs projects):
1- Did I have to make a DC project with a EJB Module project, other DC for Enterprise Aplication Project and other DC for a Web Module Project ?, if it so...must be one father and the others childs?
2- Can I use only a DC-EJB Module and consume the project in my DC-WD? (I think that this is the right one but my project don't generate a deployable file....so begin wandering if the choice 1 is necessary....or something is missing... I expect a sda if not a default ear or war)
3- Other (any idea?)
I can't find any tutorial or good practice about it.
Thanks a lot for your time on this thread.
Rocío.See the tutorial Using EJBs in Web Dynpro Applications.pdf
-
Diff b/w bc4j model and ejb model in adf11g
hi all,
iam murali iam new for adf 11g i have some dout's in adf11g ,can u please solve my probleam
what is the difference b/w bc4j componet and ejb componet,how to develop ejb application in adf11g.,how to develop ejb application in adf11gTake a look at this tutorial for starters:
http://st-curriculum.oracle.com/obe/jdev/obe11jdev/ps1/ejb/ejb.html -
How to integrate a Smart Form in Web Dynpro and how to view it on portal?
Hi,
I have created a Smart Form in ABAP. I need to use it in Web Dynpro. How can this be done?
I want to integrate this Smart Form in a Web Dynpro Application and then display this Smart Form on the Portal (when I deploy the Web Dynpro application).
Is it compulsory to first convert the Smart Form into PDF Format? Is there some other way ??
Thanks in Advance.
Regards,
HarshadaHi,
Go through Re: Web Dynpro and Smart Forms.
Regards,
Satyajit. -
JDBC, JMS and EJB transactions - possible problem?
Hello,
I am using Oracle 9, Weblogic 8.1 SP 4, MyEclipse and
XDoclet.
In my current project I have the following piece of code
in one of my message driven beans (code cited as pseudocode
without unnecessary details):
* @ejb.bean name="MyMessageProcessor"
* display-name="Display name for a MyMessageProcessor"
* jndi-name="ejb/MyMessageProcessor"
* description="Bean MyMessageProcessor"
* destination-type="javax.jms.Queue"
* transaction-type="Container"
* acknowledge-mode="Auto-acknowledge"
* subscription-durability="Durable"
* generate="false"
* @ejb.transaction type="Required"
public class MyMessageProcessor implements MessageDrivenBean, MessageListener {
public void onMessage(Message msg) {
try {
//obtaining connections to two different databases via JNDi
java.sql.Connection connOne =
((DataSource)ctx.lookup("DataSourceOne")).getConnection();
java.sql.Connection connTwo =
((DataSource)ctx.lookup("DataSourceTwo")).getConnection();
// performing some UPDATEs and INSERTs on connOne and connTwo
// calling some other methods of this bean
//creating the reply JMS message and sending it to another JMS queue
Message msgTwo = this.createReplyMessage(msg)
this.queueSender.send(msgTwo);
//commiting everything
this.queueSession.commit();
} catch (Exception ex) {
try {
if (this.queueSession!=null) this.queueSession.rollback();
} catch (JMSException JMSEx) {};
this.context.setRollbackOnly();
Some days ago (before the final remarks from my client) there used to be only one DataSource configurated on the basis of the
connection pool with non-XA jdbc driver. Everything worked fine
including the transactions (if anything wrong happend not only wasn't the replymessage sent, but also no changes were written
to database and the incomming message was thrown back to the my bean's
queue).
When I deployed the second DataSource I was informed by an error message, that only one non-transactional resource may
participate in a global transaction. When I changed both datasources
to depend on underlying datasources with transatcional (XA) jdbc drivers, everything stopped working. Even if
EJB transaction was theoretically successfully rolledbacked, the changed were written to the database
and the JMS message wasn't resent to the JMS queue.
So here are my questions:
1. How to configure connection pools to work in such situations? What JDBC drivers should I choose?
Are there any global server configurations, which may influence this situation?
2. Which jdbc drivers should I choose so that the container was able to rollback the database transactions
(of course, if necessary)?
3. Are there any JMS Queue settings, which would disable the container to send message back to the
queue in case of setRollbackOnly()? How should be the Queue configurated?
As I am new to the topic and the deadline for the project seems to be too close I would be grateful
for any help.
This message was sent to EJB list and JDBC list.
Sincerely yours,
Marcin ZakidalskiHi,
I found these information extremely useful and helpful.
The seperate transaction for sending messages was, of course, unintentional. Thanks a lot.
Anyway, I still have some problems. I have made some changes to the
code cited in my previous mail. These changes included changing QueueSessions
to non-transactional. I also set the "Honorate global transactions" to true.
I am using XA JDBC driver. After setting "Enable local transactions" to false
(I did it, because I assume that JDBC transactions should be part on the global
EJB transaction) I got the following error:
java.sql.SQLException: SQL operations are not allowed with no global transaction by default for XA drivers. If the XA
driver supports performing SQL operations with no global transaction, explicitly allow it by setting
"SupportsLocalTransaction" JDBC connection pool property to true. In this case, also remember to complete the local
transaction before using the connection again for global transaction, else a XAER_OUTSIDE XAException may result. To
complete a local transaction, you can either set auto commit to true or call Connection.commit() or Connection.rollback().
I have also inspected the calls of methods of bean inside of onMessage() method just to check, whether
the transactions are correctly initialized (using the weblogic.transaction.Transaction class).
My questions are as follows:
1. Any suggestions how to solve it? I have gone through the google answers on that problem and only
thing I managed to realize that JDBC must start its own transaction. Is there any way to prohibit it
from doing that? Can using setAutocommit(true/false) change the situation for better?
2. How to encourage the JDBC driver to be a part of EJB transaction?
3. As I have noticed each of ejb method has its own transactions (transactions have different
Xid). Each method of the bean has "required" transaction attribute. Shouldn't it work in such
way that if already started transaction exists it is used by the called method?
4. The DataSources are obtained in my application via JNDI and in the destination environment I will have slight
impact on the configuration of WebLogic. What is least problematic and most common WebLogic configuration which would
enable JDBC driver to participate in the EJB transaction? Is it the WebLogic configuration problem or can it be
solved programmically?
Currently my module works quite fine when "enable local transactions" for DataSources is set to true, but this way
I am loosing the ability to perform all actions in one transaction.
Any suggestions / hints are more than welcomed. This message was posted to jdbc list and ejb list.
Marcin -
OC4J 9.0.3 and EJB 1.1 deployments???
I can not deploy my ejb1.1 beans on 9.0.3 container.
OC4J crashes with an XML parse error as a null pointer exception.
If I remove my O-R mappings from my orion-ejb-jar.xml file, the container starts up ok (app wont run as it needs the mappings)
9.0.3 docs claim I should be able to use my 1.1 ejb in this ejb 2.0 container.
Solaris release notes for 9.0.3 claim I must migrate to ejb2.0
Someone else posted this same question but got no replies.
Anyone else deployed ejb1.1 with OR mappings in 9.0.3 successfully yet?
thanksI have tried migrating to an ejb2.0 set of beans and ejb-jar.xml file.
With no <query> tags installed for my finders I notice that a typical finder produces this:
<!-- Generated SQL: "select Isp.isp_Id from Isp -->
This is vastly different from the 1.1 orion-ejb-jar.xml which would list ALL column names in the finder - hence how am I going to do a findAll? The currently generated sql is way off. Deployment of the "ormap" demo also shows a lack of column names in the generated SQL finder methods in orion-ejb-jar.xml.
Further, as soon as I introduce the query in the 2.0 version of ejb-jar.xml, the container dies with a null pointer exception. Removing this from the ejb-jar and bean deploys. Useless, cause theres no finders though.
Also, attempts to add to the <finder-method query=...> tag yield container crashes with null pointers too.
This is not very robust to say the least. Can you provide names of jar files that would cause such exceptions?
When NO query tag is inserted in the ejb-jar file, attempts to run a sample client using findByPrimaryKey return successfully but use of findAll causes timeouts similar to whats described in
"finders giving "timeout expired waiting for an instance" after 0, 1, or 2 calls" in this same forum.
Heres the query out of the ejb-jar.xml file...
<query>
<query-method>
<method-name>findAll</method-name>
<method-params></method-params>
</query-method>
<ejb-ql>
SELECT OBJECT(o) from IspTb o
</ejb-ql>
</query>
IspTb is the <abstract-schema-name> Tables exist in db.
The full error...which prevents deployment of the ejbs and hence no rewrite of the orion-ejb-jar file.
=========
10/23/02 1:54 PM: javax.ejb.EJBException: nested exception is: java.lang.NullPointerException
10/23/02 1:54 PM: java.lang.NullPointerException
10/23/02 1:54 PM: at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
10/23/02 1:54 PM: at java.lang.ClassLoader.loadClass(ClassLoader.java:287)
10/23/02 1:54 PM: at com.evermind.naming.ContextClassLoader.loadClass(ContextClassLoader.java:135)
10/23/02 1:54 PM: at java.lang.ClassLoader.loadClass(ClassLoader.java:287)
10/23/02 1:54 PM: at com.evermind.naming.ContextClassLoader.loadClass(ContextClassLoader.java:135)
10/23/02 1:54 PM: at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getClass(PersistenceDescriptor.java:767)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getStateClass(PersistenceDescriptor.java:753)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getCMPFieldType(PersistenceDescriptor.java:1302)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.initializeFieldInfo(PersistenceDescriptor.java:1052)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getPersistentFieldInfo(PersistenceDescriptor.java:805)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.<init>(SQLGenerator.java:151)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.generateSQL(SQLGenerator.java:360)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.generateSQL(SQLGenerator.java:309)
10/23/02 1:54 PM: at com.evermind.server.ejb.deployment.EJBPackage.translateEjbqlQeries(EJBPackage.java:2100)
10/23/02 1:54 PM: at com.evermind.server.ejb.compilation.Compilation.translateEjbqlQeries(Compilation.java:140)
10/23/02 1:54 PM: at com.evermind.server.ejb.compilation.Compilation.compile(Compilation.java:178)
10/23/02 1:54 PM: at com.evermind.server.ejb.EJBContainer.postInit(EJBContainer.java:551)
10/23/02 1:54 PM: at com.evermind.server.Application.postInit(Application.java:431)
10/23/02 1:54 PM: at com.evermind.server.Application.setConfig(Application.java:136)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.addApplication(ApplicationServer.java:1635)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.initializeApplications(ApplicationServer.java:1585)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.setConfig(ApplicationServer.java:1240)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServerLauncher.run(ApplicationServerLauncher.java:93)
10/23/02 1:54 PM: at java.lang.Thread.run(Thread.java:479)
10/23/02 1:54 PM: javax.ejb.EJBException: nested exception is: java.lang.NullPointerException
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getClass(PersistenceDescriptor.java:770)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getStateClass(PersistenceDescriptor.java:753)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getCMPFieldType(PersistenceDescriptor.java:1302)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.initializeFieldInfo(PersistenceDescriptor.java:1052)
10/23/02 1:54 PM: at com.sun.enterprise.deployment.PersistenceDescriptor.getPersistentFieldInfo(PersistenceDescriptor.java:805)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.<init>(SQLGenerator.java:151)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.generateSQL(SQLGenerator.java:360)
10/23/02 1:54 PM: at com.sun.ejb.sqlgen.SQLGenerator.generateSQL(SQLGenerator.java:309)
10/23/02 1:54 PM: at com.evermind.server.ejb.deployment.EJBPackage.translateEjbqlQeries(EJBPackage.java:2100)
10/23/02 1:54 PM: at com.evermind.server.ejb.compilation.Compilation.translateEjbqlQeries(Compilation.java:140)
10/23/02 1:54 PM: at com.evermind.server.ejb.compilation.Compilation.compile(Compilation.java:178)
10/23/02 1:54 PM: at com.evermind.server.ejb.EJBContainer.postInit(EJBContainer.java:551)
10/23/02 1:54 PM: at com.evermind.server.Application.postInit(Application.java:431)
10/23/02 1:54 PM: at com.evermind.server.Application.setConfig(Application.java:136)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.addApplication(ApplicationServer.java:1635)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.initializeApplications(ApplicationServer.java:1585)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServer.setConfig(ApplicationServer.java:1240)
10/23/02 1:54 PM: at com.evermind.server.ApplicationServerLauncher.run(ApplicationServerLauncher.java:93)
10/23/02 1:54 PM: at java.lang.Thread.run(Thread.java:479) -
Hi every one,
Can <b>ABAP Objects and EJB</b> be compared?
-Naveen.Hi Naveen,
Check this guide- might be useful-
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/dc09af90-0201-0010-d09b-bd611a11070b
Regards,
Moorthy -
Had nebody used Swing for GUI and EJBs for business logic. HEre i need to use Swing for gui rather than JSPs.
Can nebody help??My question is ...
How do u call EJBs from swing based applets..
In J2EE transaction management cud be done at server side but how will we manage with the swing app?? -
Abap web dynpro and portal events
First off, a little introduction: My name is Martin Kroppen, I am an Abap developer for SAP Netherlands, and I am currently involved in a project for hospitals to built a portal. For this, I have created 2 Abap web-dynpros, and then impemented the views as iviews in an EP. What I want to achieve is that the input view triggers the display view on a second page, and the data is shown for the values in the input view (all in the same browser window).
I am using the portal integration manager for this, with the method for relative navigation.
The navigation is working fine, only problem is that I don't know how to handle the business parameters that I send over.
My questions are:
1. is this the correct way for navigating between abap webdynpro iviews in the portal?
2. what is the correct way to read the business parameters into my context of the second Abap WD application?
I tried the solution that is described below, I could not get it to work correctly.
If you define BUSINESS_PARAMETERS as application parameters in your Web
Dynpro application and the parameter names start with ″APP″, they will
automatically be forwarded to the startup plugs of the Web Dynpro application
provided they are marked as startup parameters. In this case, keep in mind that
the iView/page used as the navigation target must be assigned to the user role.
If it is not, navigation cannot be triggered.
Hope someone can help me
Regards
Martin KroppenHi,
please refer to this link for portal integration
Web Dynpro for ABAP Portal Integration [original link is broken] -
OC4J EJBQL and EJB 2.0 features
Hello Debu Panda and All
I've got all howtos and I mangaged to get some parts of OC4J [Oracle9iAS (9.0.3.0.0) Containers for J2EE (build 020323.1689)] working.
There are still some issues that are stalling our development. Could you please comment on them, maybe providing an estimate of when they will be solved/implemented?
First of all, a little background. Our application uses many Java Swing application clients that connect to the EAR application in the container.
The ear application has the following structure:
All database access (Oracle 8i, located in its own server) is done exclusively by means of CMP entity beans. A entity bean may access other entity beans. There are workflow session beans (stateful and stateless) that access the entity beans. All clients see only the workflow session beans (session beans fagade).
Our applicatoin is complex, having more than 80 session beans and more than 25 entity beans (not counting entity beans that exist only to represent relationships among entity beans).
There goes the questions:
1) It seems that entity beans cannot currently be referenced by remote interfaces. We couldn't deploy our application using it. Since we could use only local interfaces fot entity beans, thats what is been done now.
2) There is no CMR supported. Is this true?
3) EJBQL seems to be very limited. In the howto examples there are EJBQL statements that compare two numbers. However, when we tried to use String comparisons, it didn't work. Here is the statement:
"SELECT DISTINCT OBJECT(p) FROM Person p WHERE p.name = ?1"
If I compile, package and deploy the ear applicatin with the above EJBQL statement, OC4J generates an exception when executing the finder method. The exception is:
"java.rmi.NoSuchObjectException: Session has timed out
at com.evermind.server.ejb.StatefulSessionEJBObject.throwPassivisat
ception(StatefulSessionEJBObject.java:188)
at Cad023Remote_StatefulSessionBeanWrapper0.obterPessoasPorParteNom
023Remote_StatefulSessionBeanWrapper0.java:754)
at java.lang.reflect.Method.invoke(Native Method)
at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:8
at com.evermind.util.ThreadPoolThread.run(ThreadPoolThread.java:64)"
If I remove the where clause, the expection is gone. However, I get all records. ;-)
4) It seems that all EJBQL clauses must be capitalized. Is this true?
FINALY)
Is there a newer OC4J build that could use to get the development going? Do you know where there will be one? Is there any way of contacting the OC4J development team to report bugs?
If you would like, we could discuss it in private e-mail (please use my private mail [email protected]).
Thanks for your attention,
Luis Fernando Soeiro
Hi !! OC4J 9.0.3 developer's preview has most features of EJB 2.0. We are working on updating on our docs and samples for EJB 2.0
Please look at the following URL that has some How Tos on EJB 2.0 features such Local Interfacea, EJB QL, etc : http://otn.oracle.com/tech/java/oc4j/htdocs/oc4j-how-to.html#ejb
regards
Debu Panda
Oracle --------------------------
Luis Soeiro <mailto:[email protected]> <mailto:[email protected]>Type : Question Date : Apr 11, 2002 15:15 PT Hello
Some colleagues and I are trying to port a large project from JBOSS to OC4J. We used JBOSS 3.0 (beta) in order to evaluate EJB2.0 features and see if we could use it. We already have OC4J in production, but only as a JSP/Servlet container. The next step would be to deploy our EJB application to OC4J.
We have read the material and it is written that OC4J (developers preview) is EJB 2.0 compliant. However, the specific documentation and the examples don't show how to specify OC4J specifc XML files. We absolutely need CMR and Local Interfaces, because we don't have the time required to downgrade our JBoss EJB2.0 application to the EJB 1.1 specification. We have over 80 Session Beans and over 20 Entity Beans.
Is there anybody there that can confirm that OC4J developer's preview is really EJB2.0 compliant? If so, could you send me some pointers to information about OC4J container specifc deployment descriptors? The docs listed at the web site don't have EJB2.0 features listed, nor does the Oracle samples.
Thanks for your attention,
desperately,
Luis Fernando SoeiroHI,
I worked out CMR and EJB-QL with single bean.
Using CMR, it is possible to get one bean reference through other bean, but
When I tried EJB-QL with bean to bean navigation then I run into problem. -
Global transactions in OSB and EJB 2.1
Hi,
My team is working in a SOA service based on OSB 11g (11.1.1.5) using DB JCA Adapter and EJB 2.1 over WLS 10g(WLI environment). The logic of the service works in this way:
1. A table in a database (XE) is polled by the DB Adapter which starts the service (1 row = 1 message).
2. The message contains a collection of items to be inserted in another Oracle database.
Once a message/row is picked, and after some steps (logging, validation,etc), there is a for..each action which extracts each item of the collection and executes a service callout action to a business service.
3. This business service uses EJB protocol to call an EJB (2.1 + WLS Extensions). The EJB is deployed in another domain (WLS 10.3.0/10g and Oracle BEA drivers) and only executes an store procedure with the parameters based on the message and inserts these values in a table.
4. Once the for...each finishes, there is a call to another proxy service which marks the message/row as "processed" in the source table. This update is done via DB JCA also.
5. In case of an error, the error handler of the proxy service calls the proxy service mentioned above to mark the row as "Failed" (in fact there is a retry mechanism, but it's not important for now).
The service requires to work inside a global transaction. The main requirement is that the collection of items should be processed as "All or None", so basically we're using the options to manage the global transaction. However, the problem is that it's failing to rollback the whole insertion of items when an error is simulated. It only rolls back the last insertion/execution of SP.
Additionally, the proxy service that should mark the row as FAILED, never updates this one, and the tables stay locked until we modify one of the store procedure in order to avoid the simulated error and commit the transaction.
The EJB uses WLS extensions with the annotations to "transaction required". The proxy service has the option transaction required also. The database drivers are all XA and we're testing against Oracle11g XE (however, the EJB destiny will be Oracle 8i in production).
We have tried different alternatives, splitting the logic in different proxies (Proxy services for JCA, Proxy with For Each for EJB, etc), isolating the specific part with the EJB call, without success.
The security between domains is set as Global Trust.
Do you have any idea, example or suggestion about this problem? Is EJB really supported in Global Transactions and XA?
Thanks in advance.where do you find the J2EE Connector 1.5 compliant
Resource Adapter?I wrote the compliant adapter myself. Hey Steve,
Were you able to find a solution for this problem. I am struggling with the same problem with the RI Beta implementation.
Sandeep -
ADF and EJB. Why so little samples / information
Hi All,
I was wondering if other JDev / ADF developers have the same feeling as me in regards to ADF / EJB.
There is barely enough information and examples on using ADF with EJB. Seems that most examples and blogs are related to BC instead.
I was reading an article (sorry, don't have the link to it) not long ago that an Oracle Executive was asked if BC or EJB was Oracle's future and EJB was the answer. However, that doesn't seem to be the what most blogs and sample are about.
I know that BC has tight integration with ADF, but it's not a standards based back-end framework. We are locked in the ADF UI for all of our development, but not touching BC at all. All code is EJB compliant.
So, my request is:
- comments? do other developers out there feel the same way?
- bloggers, the great articles from "Frank Nimphius" and "Andrejus Baranovskis", not to mention others, can you guys post a little more on using ADF with EJB?
BTW: great article on that "http://www.oracle.com/technology/products/jdev/tips/fnimphius/ControlHintsWithPojos/controlHintsWithPojos.html" (How-to find and set control hints on POJO entities in bean Data Controls)
Thanks and Regards
Jonny OenningHi!
I rised this issue long time ago - with TP3 I noticed regression in EJB/JPA support with ADFm (binding layer as referred by Shay). Following the development, I draw this conclusions:
1. Oracle is oriented toward J2EE standards, including the strategic orientation to EJB/JPA. The team that managed JDev 11g initial development phases was oriented toward EJB (but was replaced/fired sometime between TP2 and TP3).
2. Oracle decided that FMW 11g stack products as well as EBS migration from PL/SQL to EJB is not feasible in short time frame (I think that was poor judgment). So, the BCs got the push over the EJB and TP3/4 was biased toward BCs. Even the default Fusion technology stack is changed - in TP1/2 the Fusion Web project was ADF RC + EJB buy default and then changed to ADF RC + BC4J. Also the development guides were "rephrased".
3. As BC4J are proprietary Oracle technology, the are lacking many J2EE standard features and many strong points of the modern multi-tier architecture. Many developers are witnessing the performance / scalability issues as the BC4J are basically a mutant: they are SQL based concept wrapped into EJB for deployment! But they are not relaying on proven scalable J2EE technologies (like JPA/JTA, object caching etc.). They are trying to reinvent the wheel, decalratively offering the heaven of J2EE multi-tear architecture to old fashion SQL-focused architects/developers. But it is just a marketing - the truth is that BC4J are not and cannot be the replacement for proven J2EE architecture. They are trying to mimic the concepts of J2EE (like object-entity mapping, like JTA/JPA, like scalability and caching, transparent web-services exposition etc.) but they are lagging behind even J2EE 1.4 and we are facing the J2EE 6 in few months!
4. Oracle is aware that EJB is the future but they are trying to bridge the gap between their legacy code written mainly in PL/SQL. So they developed and they are developing the JDeveloper 11g in fashin that should support and serve for their primary goals - migration of their own old PL/SQL based products to new, J2EE, world (of BEA!).
So, anyone who is expecting the that Oracle JDeveloper is what they are marketing (full scale J2EE IDE) - is going to waste some time and money waiting the Oracle to finish it's half-way migration from PL/QL and Forms/Reports to PL/SQL + ADF RC! In few years from now.
Thus, if you need efficiency in J2EE standards development - try something else than JDeveloper. Or, as suggested by Shay, don't use overmarketed ADFm as it is not compatible with EJBs in scalable / clustered deployment! Yes, that is proven issue (but I wont elaborate here as it is already well elaborated in this forum in another tread but the Oracle guys wisely neglected that issue).
And beside few very very old and for me useless blog entries (one of which is not working in 11g as you may read in comments) there will be no much support for EJBs in this release of JDeveloper - I can bet!
But, as final message to the public, I'm still stuck with JDev and EJBs as. When you develop you own patterns, it is still the best combination for developing the scalable, high performance apps on Oracle FMW 11g platform - mandatory including several grid technologies that are making the difference in scalability of true J2EE apps and quasi-J2EE "Fusion" apps based on BC4Js "silently" wrapped in EJBs for deployment.
Regards,
PaKo
Maybe you are looking for
-
my apps are not being updated when pressing the update all button. It just says installing and no update is being done., my apps are not being updated when pressing the update all button. It just says installing and no update is being done.
-
Javax.sql.rowset.serial.SerialBlob cannot be cast to oracle.sql.BLOB
Hi there, I'm facing this exception. My code: final ReportTemplateAttachment rta = new ReportTemplateAttachment(); FileBlob fb = new FileBlob(); fb.setContentType(attachmentDto.getContentType().getValue()); fb.setCreationDate(sysDate); fb.setCreation
-
Make all open finder windows come to the front?
Things that used to be so simple on the Mac are now so complicated. I have a bunch of finder windows open. Most of them are hidden behind other application windows, like my browser. I used to be able to click anywhere on the desktop to make all windo
-
Please help. Whenever I try to open a personal folder on my desktop, the whole screen blinks and nothing happens. Similarly, when I try to use Finder, and click on the folder, Finder quits and the whole screen blinks. Any thoughts appreciated.
-
"some of the items in the itunes library were not copied to ipod b/c you're
not authorized to play them on this computer", that is the message i got after purchasing music from itunes. background is that i got a new operating system a while back. what should i do? any way to become authorized? thanks for any and all help!