Passing connection object as EJB parameter

I am working on a legacy website which uses stateless session EJB's and runs on
WebLogic 6.1 using JDK 1.3 and Oracle 8.1.6, I am working on upgrading this
application to WebLogic 9.2, JDK 1.5 and Oracle 10.2.
I configured a datasource in WebLogic using the Oracle thin XA driver.
When attempting to run the application I got an error message stating that an
object which is not serializable is being passed as an EJB parameter. I found that
several EJB methods are passing open database connections as parameters so to fix this
issue we should change the code. However, I am reluctant to change the code since I
believe that the reason for passing the connection objects is that the developers
wished to preserve transactions and so any changes might result in many issues in
the application. I have the following questions:
- The code is doing something which is not allowed. So why was this okay in WebLogic
6.1 using the older Oracle oci driver?
- One way to get around this would be to convert the EJB's to POJOS. There are no
container based properties and the only EJB's are stateless session EJB's. The
high water mark for concurrant usage is 40. There is only a single server (no clustering)
What kind of issues would such a
conversion bring?
- Would it be better to convert the EJB's to local interfaces? What kind of issues would
this bring?
Any other suggestions would be very much appreciated.

Salma Saad wrote:
Thanks Joe,
Converting to POPJOS from EJB or to local EJB's is changing the code but it limits changes to the logic of the application which could result in unforseen issues.
There is only 1 server and 1 jvm but I get a not serlializable exception which I did not get when running this code on WebLogic 6.2 or 8.1 using Oracle 8.1.6 and 9i .I am getting it now that I am using WL 9.2 and Oracle 10.2.
I looked through all the parameters and everything is a string except for Connection which does not implement serializable. There is a Vector but all the contained objects are strings. Let me know if you have any ideas what I can do to get rid of this, and also why is it happenning in the newer version of WL when it didn't happen before?
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****
     at weblogic.rmi.internal.CBVWrapper.copy(CBVWrapper.java:57)
     at com.isr.applications.isrinteractive.ejb.sessionbean.user.UserBean_x07h56_EOImpl_CBV.validateLogin(Unknown Source)
     at jsp_servlet._admin.__validatelogin._jspService(__validatelogin.java:187)
     at weblogic.servlet.jsp.JspBase.service(JspBase.java:34)Hi. I looked at the code throwing this exception, and
it's in a whole 'nother area of the server, nothing to
do with JDBC or EJBs as such. It's odd too, because it
seems to have already verified that whatever object
it's dealing with is a serializable object...
I recommend you're opening an official support case
about this exception, and maybe they'll want help
reproducing it...
Joe
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
     at weblogic.servlet.internal.ServletStubImpl.onAddToMapException(ServletStubImpl.java:391)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:309)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at com.isr.applications.isrinteractive.servlets.reports.SessionFilter.doFilter(Unknown Source)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3212)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1983)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1890)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1344)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: java.io.NotSerializableException: java.lang.Object
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
     at weblogic.rmi.extensions.server.CBVOutputStream.writeObject(CBVOutputStream.java:84)
     at weblogic.rmi.internal.CBVWrapper.copy(CBVWrapper.java:49)
     ... 20 more

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Edited by: stupidtss on Oct 28, 2009 12:32 AM

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"Manuel Villalta" <[email protected]> wrote in message
news:3cd920c4$[email protected]..
>
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>
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this.StudentNumber = StudentNumber;
this.studentHobbies = StudentenHobbies;

yes, thats how you do it.
maybe you should first try your idea and then ask people questions?
also, use ArrayList instead of Vector, its better - google as to why if you care.

Hoe to pass object as a parameter thru webSerive

I need to pass Object as a parameter to web service:
example:
public calss returnCodes{
int ret_code;
String ret_string;
public retrunCodes(int ret_code, String ret_string){
this.ret_code = ret_code;
this.ret_string = ret_string;
public int getret_code()
return this.ret_code;
public String getret_string {
return this,ret_string
and other repc holder class to hold returnCodes
public class retrunCodesHolder implents javax.xml.rpc.Holder
returnCode value;
pubic returnCodesHolder(){
public returnCodesHolder(returnCodes value) {
this.value = value;
In Webservice I use returnCodesHolder as parameter.
WebService getReturnCodesWs I have
returnCodes retCodes = new returnCodes(04,"Good return code)
returnCodesHolder retholder = new returnCodesHolder(retCodes)
return myString;
When I am calling above webService in servlet I have code:
org.test.mytest.returnCodesHolder retHolder = new org.test.mytest.returnCodesHolder();
String result = port.getReturnCodesWs(retHolder);
How to I access /get values of returnCodes class in my calling servlet?
I am using Tomcat v 6.0

I believe (although have never used, so if I'm wrong,
correct me please!) you can do it with implicit
dynamic cursors, such as:
For rec in 'select col1, col2 from table 1 '||lstr
loop
Not really:
michaels> declare
   lstr   varchar2 (30) := ' where empno = 7788';
begin
   for rec in 'select * from emp e ' || lstr
   loop
      null;
   end loop;
end;
Error at line 1
ORA-06550: line 5, column 4:
PLS-00103: Encountered the symbol "LOOP" when expecting one of the following:
   . ( * @ % & - + / at mod remainder rem .. <an exponent (**)>
   ||

Passing Inner class name as parameter

Hi,
How i can pass inner class name as parameter which is used to create object of inner class in the receiving method (class.formane(className))
Hope somebody can help me.
Thanks in advance.
Prem

No, because an inner class can never have a constructor that doesn't take any arguments.
Without going through reflection, you always need an instance of the outer class to instantiate the inner class. Internally this instance is passed as a parameter to the inner class's constructor. So to create an instance of an inner class through reflection you need to get the appropriate constructor and call its newInstance method. Here's a complete example:import java.lang.reflect.Constructor;
class Outer {
    class Inner {
    public static void main(String[] args) throws Exception{
        Class c = Class.forName("Outer$Inner");
        Constructor cnstrctr = c.getDeclaredConstructor(new Class[] {Outer.class});
        Outer o = new Outer();
        Inner i = (Inner) cnstrctr.newInstance(new Object[]{o});
        System.out.println(i);
}

Passivation of Connection Object in Stateful Session Bean

Hi all,
I am developing a Stateful session bean that has a Connection object as its instance variable. And this bean starts transaction that spans across multiple method calls and finally either commit or rollback.
BeanClass
UserTransaction utx;
Connection conn;
ejbCreate()
allocateconnection();
ejbRemove()
closeconnection();
ejbActivate()
allocateconnection();
ejbpassivate()
closeconnection();
StartTransaction()
utx = getusertransaction();
utx.begin();
Method1()
do something with database
Method2()
do something with database
CommitTransaction()
utx.commit();
For example, the typical usage of this bean would be:
bean.StartTransaction();
bean.Method1();
bean.Method2();
bean.CommitTransaction();
Here are my two questions:
1. General Question: In order for a Connection object to join a Transaction, Do I have to create the connection after the transaction has started?
2. If the answer to the above question is yes, then: I understand that when this bean get passivated, the UserTransaction instance object would be passivated. And since the connection object can't not be passivated, I have to recreate the connection object in ejbactivate() method, would newly created connection participate in the same Transaction that was being passivated and now activated?

>
Hi all,
I am developing a Stateful session bean that has a
Connection object as its instance variable. And this
bean starts transaction that spans across multiple
method calls and finally either commit or rollback.
BeanClass
UserTransaction utx;
Connection conn;
ejbCreate()
allocateconnection();
ejbRemove()
closeconnection();
ejbActivate()
allocateconnection();
ejbpassivate()
closeconnection();
StartTransaction()
utx = getusertransaction();
utx.begin();
Method1()
do something with database
Method2()
do something with database
CommitTransaction()
utx.commit();
For example, the typical usage of this bean would be:
bean.StartTransaction();
bean.Method1();
bean.Method2();
bean.CommitTransaction();
Here are my two questions:
1. General Question: In order for a Connection object
to join a Transaction, Do I have to create the
connection after the transaction has started?Strictly NO. In fact, the connection is obtained first and then can a transaction begin.
2. If the answer to the above question is yes, then: I
understand that when this bean get passivated, the
UserTransaction instance object would be passivated.
And since the connection object can't not be
passivated, I have to recreate the connection object
in ejbactivate() method, would newly created
connection participate in the same Transaction that
was being passivated and now activated?
The answer to first question being NO, your argument for question 2 does not hold true. According to the EJB specification, a stateful session bean can only be passivated between the transaction and not within a transaction. Your implementation for the stateful EJB is good to work.

Passing connection object as EJB parameter

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