Persistenance for Java Objects Using Toplink

Hi All Happy New Year
I am trying the a tutorial in Jdeveloper 10.1.3.0.4 called
Provide Persistenance for Java Objects Using Toplink.
I have followed the instructions and get the following error.
com.evermind.reflect.UndeclaredExceptionTypeException: oracle.oc4j.rmi.OracleRemoteException
at __Proxy1.persistEntity(Unknown Source)
at acme.ejb.session.EmpSessionClient.main(EmpSessionClient.java:29)
oracle.oc4j.rmi.OracleRemoteException: Invocation error: java.lang.NoSuchMethodException: acme.ejb.session.EmpSession.persistEntity(java.lang.Object)
The release notes mention TopLink POJO's Must Implement java.io.Serializable When Returned From a Session Bean's Remote Interface (4902787) When creating a session bean facade for TopLink POJO objects, you must implement java.io.Serializable for each of the TopLink POJO objects returned from the SessionBean facade through a remote interface. This is typically required when using ADF Swing, a EJB Sample Client, or when your EJB Session Bean resides on a separate application server from the client. You can also tell you you need to implement java.io.Serializable when you get the following exception:
com.evermind.reflect.UndeclaredExceptionTypeException:
/oracle.oc4j.rmi.OracleRemoteException/
at __Proxy1.[Your Class Name Here] (Unknown Source)
The workaround is to manually edit each POJO object to implement java.io.Serializable.
I have only one POJO which is declared as follows:
public class EmpInfo implements Serializable {
Can anybody help me understand what I need to do to get it to work?
Many Thanks in Advance

Hi,
can you send me your test scenario/project at anuj dot k dot jain at oracle dot com. I tried reproducing this but was unable to do so.
Thanks,
anuj dot k dot jain at oracle dot com

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Hi Doug, we add the authorization filter directly in the application code as the query is getting set up.
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1)
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oup.setXdoObjectId(so.getId());
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mDataAccess.createObject(oup, this);
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Object[] args = {dae.getClass().toString(), dae.getMessage()};
logger.severe(MessageFormat.format(EXCEPTION_MESSAGE, args));
throw new DataAccessException("Failed to grant object privilege.", dae);
3)
// example Query code
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ExpressionBuilder eb = new ExpressionBuilder();
Expression exp = eb.get(queryKeys[0]).equal(keyValues[0]);
for (int i = 1; i < queryKeys.length; i++)
exp = exp.and(eb.get(queryKeys[i]).equal(keyValues[i]));
// check if need to add authorization filter
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query.cascadePrivateParts();
Session session = getSession();
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4)
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private Expression appendReadFilter()
ExpressionBuilder eb = new ExpressionBuilder();
Expression exp1 = eb.getTable("ALL_OBJECT_PRIVILEGES").getField("xdoobject_id");
Expression exp2 = eb.getTable("ALL_OBJECT_PRIVILEGES").getField("user_id");
Expression exp3 = eb.getTable("ALL_OBJECT_PRIVILEGES").getField("privilege");
Vector args = new Vector();
args.add(READ_PRIVILEGE_VALUE);
Expression exp4 =
exp3.getFunctionWithArguments("bitand",args).equal(READ_PRIVILEGE_VALUE);
SessionContext sc = mScm.getCurrentSessionContext();
return eb.get("ID").equal(exp1).and(exp2.equal(sc.getUserId()).and(exp4));
// helper to get Toplink Session
private Session getSession() throws DataAccessException
SessionContext sc = mScm.getCurrentSessionContext();
Session session = TLTransactionManager.getActiveTransaction(sc.getUserId());
if (session == null)
session = TLSessionFactory.getSession();
return session;
// method of TLTransactionManager, provides easy access to TLSession
// which handles Toplink Sessions and is a singleton
public static UnitOfWork getActiveTransaction(String userId)
throws DataAccessException
TLSession tls = TLSession.getInstance();
return tls.getTransaction(userId);
// the TLSession method, returns the active transaction (UOW)
// or null if none
public UnitOfWork getTransaction(String uid) {
UnitOfWork uow = null;
UowWrapper uw = (UowWrapper)mTransactions.get(uid);
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Thanks!
-Tim

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We are planing to use Toplink JPA that comes with JDeveloper 11g preview release
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"Kush" <[email protected]> wrote:
>
I have a java object with the following structure.
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wdisp/J2EE/group_info_location = [?] /JavaEE/public/icf_info/icr_groups
wdisp/J2EE/url_map_location = [?] /JavaEE/public/icf_info/icr_urlprefix
Wich values should i take here actually? These one or /J2EE/icr_groups and /J2EE/icr_urlprefix ?
2. Also I have to configure (in visual administrator) the GroupInfoRequest and UrlMapRequest properties of the HTTP Provider service running on server processes. They recommend to use /J2EE/icr_groups and /J2EE/icr_urlprefix. Should it be the same values as defined in those profile parameters?
3. I have defined the instance IDs and exacte Alias in the groups definitions in nwa. Is it possible to proof somehow while using my URL http://<host>:<port>/TestApp~test/<application_resource> either im web dispatcher (traces?) or on a web site on which DI I actually land to be sure that my load balancing works properly and i don't land on my Central Instance?
Thanks a lot in advance for your advices.
best regards,
Polina

Understood, Install the web dispatcher and configre the ABAP Message Server Port and ms/http_port (T-CODE:SMMS). Test this link
http://host:port/sap/public/icf_info/icr_groups
and this would retrieve the list of ABAP (SMLG) cofigured groups.
For java load balancing, icm of that host will send the incoming requests to JAVA Dispatcher. The load balancing happens on the basis of server nodes and can be found in the web dispatcher session dispatching table.
There are no necessary parameters required for java load balancing except the number of server nodes you'll hookup to that dispatcher.
There is an option called service based, where we configure the j2ee hosts to accept the connections for the services which are running but I haven't seen much customers using this option.
Bottom line: No changes are required for java side and enable the "ext rfc" option for abap logon groups and rest will be taken care by Web Dispatcher.
Use connection pooling and high timeouts to acheive the better througput and use the SSL termination on Web Disp.

Logon groups configuration for JAVA instances using NWA method

Hello guys,
we have a BI dual System landscape (CI ABAP+ JAVA plus 2 dialog instance ABAP+JAVA, based on NW04s. I have set up a Web Dispatcher to do a load balancing for JAVA instances. I configured the logon groups according this documentation using NWA (http://help.sap.com/saphelp_nw04/helpdata/en/45/3dbe11a82b6bf1e10000000a1553f6/content.htm).
The following point is still quite unclear for me:
I have defined the instance IDs (of DIs installed on linux servers) and exacte Alias in the logon groups definitions in NWA. Is it possible to proof somehow (while accessing my URL http://<host>:<port>/TestApp~test/<application_resource> ) either in web dispatcher ->Web Administration Interface(Application Server Monitor ?) or somewhere else on which Dialog Instance I actually land to be sure that my load balancing works properly and i don't land on my Central Instance?
Thanks a lot in advance.
best regards,
Polina

ok, I have understood what you ment in the first passage Thanks!
When I put javascript:document.cookie in my Internet Explorer Address Bar i got the following information:
PortalAlias=portal; saplb_STD_JAVA=(sapt20p_T20_20)207175450; JSESSIONID=(sapt20p_T20_20)ID1892984750DB11747115157906231437End; saplb_test=(lx003207_T20_20)206509050; saplb_*=(lx003207_T20_20)206509050
what does here saplb_STD_JAVA mean?
you can use following URLs to access any particular Java Server node of any server.
https://<host name>:<https port>/irj/portal;saplb_*=<Java serer node number> https://<host name>:<https port>/irj/portal;sapj2ee_irj=<Java server node number>
What is the difference between saplb_* and sapj2ee_irj?
Thanks in advance.
regards,
Polina

Refresh Java Objects From Toplink Map

To add a many to many relationship to my toplink map, I added a field in my .java class like this:
    /**Map addressCollection <-> com.goyman.Akira.model.Address
         * @associates <{com.goyman.Akira.model.Address}>
    private List addressCollection;Then, the addressCollection map appeared in my toplink descriptor, I mapped it correctly, and now I want to know if I have to manualy write the accessor and collection management method (like addAddress...) or if something automated exists.
Regards
Kuon

Relationships will be automatically managed for you by TopLink but you may want to write accessors and add/removeAddress to use these methods in your business logic.
Hope this helps.
Anuj

Persistenance for Java Objects Using Toplink

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