Migrating applciation from weblogic to oracle 9i application server(OC4J)??????

Question

Hi,
I am migrating my ejb application from weblogic to oracle 9i application server.What changes are needed to be made in code and what configuration changes are required.
In my application i use a couple of session beans wherin a session bean calls the method of the other session bean which acceses the database.I am using a jdbc thin driver for the database connection. is it possible for a session bean to call a method of another session bean which access the database??This concept works well in weblogic where the current application is running.
The problem is that while migrating the application to the orion server, it gives an OrionCMTException ...
memory leak..etc.
Could any one clarify.
Thanks in advance!!!

Answer 1

Hi Avi and Harrison,
Cease Fire avi!!!!.First of all let me clear the issue of posting the same problem twice.Well, when i mentioned the problem the first time , i found the title session bean deployment was not right and few people would look into it as it was a common problem so i thought it would be appropriate if i mentioned the title correctly , so i posted the query again with the change in title.
Now coming to the answer for ur questions.
The platform used is MS Windows NT.
The (OC4J) version is 1.0.2.2.1.
I am not using JDeveloper.
The database is oracle 8i and i am using the thin driver.
The beans to be deployed are stateless session beans.
The client involved is a web client i.e a jsp application.
The first session bean is as follows.
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Vector;
import java.sql.Timestamp;
import java.rmi.RemoteException;
import java.util.Date;
import javax.ejb.*;
import javax.naming.*;
import initcontext;
import PrintMessage;
import JB_B2B_ERROR_PARSER;
* @stereotype SessionBean
* @homeInterface DB_UTILITYHome
* @remoteInterface DB_UTILITYRemote
public class DB_UTILITY implements SessionBean
     private SessionContext context;
private ResultSet rs = null;
private Statement stmt = null;
private Connection con = null;
private PrintMessage print = null;
public DB_UTILITY()
rs = null;
stmt = null;
con = null;
print = new PrintMessage();
     public Connection getConnection()throws RemoteException
          InitialContext initctx = null;
          Connection con = null;
          try
               initctx = initcontext.getContext();
               javax.sql.DataSource ds =
(javax.sql.DataSource)initctx.lookup("java:comp/env/jdbc/ePool");
               con = ds.getConnection();
//(javax.sql.DataSource)initctx.lookup("java:comp/env/jdbc/ePool");
catch(NamingException namingexception)
print.printUserMessage("DB_UTILITY", (new
Date()).toString(), "", namingexception);
throw new
EpoolException(JB_B2B_ERROR_PARSER.getErrorMessage("AppError",
"Epool-10001", "DB_UTILITY.getConnection"));
catch(SQLException sqlexception)
print.printUserMessage("DB_UTILITY", (new
Date()).toString(), "", sqlexception);
throw new
epoolException(JB_B2B_ERROR_PARSER.getErrorMessage("DBError",
JB_B2B_ERROR_PARSER.getSQLCode(sqlexception),
"DB_UTILITY.getConnection"));
catch(Exception exception)
print.printUserMessage("DB_UTILITY", (new
Date()).toString(), "", exception);
throw new
epoolException(JB_B2B_ERROR_PARSER.getErrorMessage("EpoolError",
"Epool10005", "DB_UTILITY.getConnection"));
          return con;
     public String getDate()throws RemoteException
          String Date=null;
          try
               con=getConnection();
               stmt=con.createStatement();
               rs=stmt.executeQuery("SELECT
TO_CHAR(SYSDATE,'YYYY-MM-DD HH:MI:SS') FROM DUAL");
               while(rs.next())
                    Date=rs.getString(1);
               stmt.close();
               con.close();
catch(SQLException sqlexception)
     print.printUserMessage("DB_UTILITY", (new
Date()).toString(), "", sqlexception);
throw new
EpoolException(JB_B2B_ERROR_PARSER.getErrorMessage("DBError",
JB_B2B_ERROR_PARSER.getSQLCode(sqlexception), "DB_UTILITY.getDate"));
catch(Exception exception)
     print.printUserMessage("DB_UTILITY", (new
Date()).toString(), "", exception);
throw new
EpoolException(JB_B2B_ERROR_PARSER.getErrorMessage("epoolError",
"Epool10005", "DB_UTILITY.getDate"));
finally
try
if(con != null && !con.isClosed())
con.close();
catch(Exception exception2)
stmt = null;
con = null;
          return Date;
     public void setSessionContext(SessionContext context)
          this.context = context;
     public void ejbActivate()
     public void ejbPassivate()
     public void ejbCreate()
     public void ejbRemove()
Also the xml files are as follows.
web.xml
<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems,
Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<!-- A friendly name for this web application, this name can be used in visual development environments, for instance -->
<display-name>AddressBook Web Application</display-name>
<!-- A human-readable description of this web application -->
<description>Web module that contains an HTML welcome page, and 4 JSP's.</description>
<!-- The file(s) to show when no file is specified, i.e. only the directory is specified. -->
<welcome-file-list>
<welcome-file>B2B_COUNTRY_CODE.jsp</welcome-file>
</welcome-file-list>
<ejb-ref>
<ejb-ref-name>SB_B2B_COUNTRY_CODEHome</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>SB_B2B_COUNTRY_CODEHome</home
<remote>SB_B2B_COUNTRY_CODERemote</remote>
</ejb-ref></web-app>
Application.xml
<?xml version="1.0"?>
<!DOCTYPE application PUBLIC "-//Sun Microsystems, Inc.//DTD J2EE Application 1.2//EN" "http://java.sun.com/j2ee/dtds/application_1_2.dtd">
<application>
<display-name>Country Code</display-name>
<module>
<ejb>epool_CountryCode-ejb.jar</ejb>
</module>
<module>
<web>
<web-uri>epool_CountryCode-web.war</web-uri>
<context-root>/epool_CountryCode-web</context-root>
</web>
</module>
</application>
ejb-jar.xml:
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 1.1//EN" "http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd">
<ejb-jar>
<description>epool_CountryCode</description>
<enterprise-beans>
<session>
<display-name>CountryCode Session
Bean</display-name>
<ejb-name>SB_B2B_COUNTRY_CODERemote</ejb-name>
<home>SB_B2B_COUNTRY_CODEHome</home>
<remote>SB_B2B_COUNTRY_CODERemote</remote>
<ejb-class>SB_B2B_COUNTRY_CODE</ejb-class>
<session-type>Stateless</session-type>
<ejb-ref>
<description>EJB Epool DButility</description>
     <ejb-ref-name>DB_UTILITYRemote</ejb-ref-name>
               <ejb-ref-type>Session</ejb-ref-type>
               <home>DB_UTILITYHome</home>
               <remote>DB_UTILITYRemote</remote>
          </ejb-ref>
          <ejb-ref>
          <description>EJB Entity Bean</description>
<ejb-ref-name>EB_B2B_COUNTRY_CODERemote</ejb-ref-name>
               <ejb-ref-type>Entity</ejb-ref-type>
               <home>EB_B2B_COUNTRY_CODEHome</home>
          <remote>EB_B2B_COUNTRY_CODERemote</remote>
          </ejb-ref>
</session>
<session>
<display-name>DbUtility Session Bean</display-name>
<ejb-name>DB_UTILITYRemote</ejb-name>
<home>DB_UTILITYHome</home>
<remote>DB_UTILITYRemote</remote>
<ejb-class>DB_UTILITY</ejb-class>
<session-type>Stateless</session-type>
</session>
<entity>
<ejb-name>EB_B2B_COUNTRY_CODERemote</ejb-name>
     <home>EB_B2B_COUNTRY_CODEHome</home>
     <remote>EB_B2B_COUNTRY_CODERemote</remote>
     <ejb-class>EB_B2B_COUNTRY_CODE</ejb-class>
     <persistence-type>Container</persistence-type>
     <prim-key-class>EB_B2B_COUNTRY_CODEPK</prim-key-class>
     <reentrant>False</reentrant>
     <cmp-field>
     <field-name>country_code_desc</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>phone_format_flag</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>country_code</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>active_date</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>date_created</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>active_flag</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>country_phone_code</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>country_tax_percent</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>sort_order</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>date_modified</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>user_created</field-name>
     </cmp-field>
     <cmp-field>
     <field-name>user_modified</field-name>
     </cmp-field>
     <resource-ref>
     <description></description>
     <res-ref-name>jdbc/ePool</res-ref-name>
     <res-type>javax.sql.DataSource</res-type>
     <res-auth>Container</res-auth>
     </resource-ref>
</entity>
</enterprise-beans>
<assembly-descriptor>
     <container-transaction>
          <method>
               <ejb-name>EB_B2B_COUNTRY_CODERemote</ejb-name>
               <method-name>*</method-name>
          </method>
          <trans-attribute>Required</trans-attribute>
</container-transaction>
<security-role>
<description>Users</description>
<role-name>users</role-name>
</security-role>
</assembly-descriptor>
</ejb-jar>
The session bean which uses the above session bean is as follows.
import javax.ejb.SessionContext;
import javax.ejb.SessionBean;
import java.sql.*;
import javax.naming.Context;
import java.sql.Timestamp;
import java.util.Vector;
import initcontext;
import DB_UTILITYHome;
import DB_UTILITYRemote;
import EB_B2B_COUNTRY_CODEHome;
import EB_B2B_COUNTRY_CODERemote;
import EB_B2B_COUNTRY_CODEPK;
* @stereotype SessionBean
* @homeInterface SB_B2B_COUNTRY_CODEHome
* @remoteInterface SB_B2B_COUNTRY_CODERemote
public class SB_B2B_COUNTRY_CODE implements SessionBean
     private SessionContext context;
     * Sets the context of the bean
     * @param context The Bean's Context
     public Vector selectCountryCode(String query,String
countquery, String pagenos) throws Exception
          Context ctx = initcontext.getContext();
          Connection con=null;
          Vector records=new Vector();
          int pageno=Integer.parseInt(pagenos);
          int min=(pageno-1)*10;
          int max=pageno*10;
          int counter=0;
          boolean recordsfound=false;     
          try
               DB_UTILITYHome home =
(DB_UTILITYHome)ctx.lookup("java:comp/env/DB_UTILITYRemote");
               DB_UTILITYRemote remote =
(DB_UTILITYRemote)home.create();
               con=remote.getConnection();
               Statement stmt = con.createStatement();
               ResultSet rscount =
stmt.executeQuery(countquery);
               while(rscount.next())
                    int temp=rscount.getInt(1);
                    int pagecount=temp;
                    pagecount=pagecount/10;
                    if((temp%10)>0)
                    pagecount=pagecount+1;               
                    records.addElement(""+pagecount);
               ResultSet rs = stmt.executeQuery(query);
               while(rs.next())
                    counter++;
                    if(counter>min && counter<=max)
                         String row[]=new String[8];     
                         recordsfound=true;
                         row[0]=rs.getString(1);
                         row[1]=rs.getString(2);
                         row[2]=rs.getString(3);
                         row[3]=rs.getString(4);
                         row[4]=rs.getString(5);
                         row[5]=rs.getString(6);
                         row[6]=rs.getString(7);
                         row[7]=rs.getString(8);          
                         records.addElement(row);
          con.close();               
          catch(Exception e)
               System.out.println("Error in selecting Country
Code "+e);
               throw new Exception("Error in selecting Country
Code "+e);
          return(records);     
     public void insertCountryCode(String country_code, String
country_code_desc, String country_phone_code, String
phone_format_flag,String active_flag, String sort_order,String
country_tax_percent)throws Exception
          Context ctx = initcontext.getContext();
          Double Sort_Order=null;
          Double cntry_tax_prct=null;
          if(sort_order!=null && sort_order.length()>0)          
          Sort_Order=new Double(sort_order);          
          if(country_tax_percent!=null &&
country_tax_percent.length()>0)          
          cntry_tax_prct=new Double(country_tax_percent);
          String user_created=null;
          Timestamp date_created=null;
          Timestamp active_date=null;
          String user_modified=null;
          Timestamp date_modified=null;          
          try
               DB_UTILITYHome dbhome =
(DB_UTILITYHome)ctx.lookup("java:comp/env/DB_UTILITYRemote");
               DB_UTILITYRemote dbremote =
(DB_UTILITYRemote)dbhome.create();
               user_created=dbremote.getUser();
date_created=Timestamp.valueOf(dbremote.getDate());
               active_date=date_created;
               EB_B2B_COUNTRY_CODEHome home =
(EB_B2B_COUNTRY_CODEHome)ctx.lookup("java:comp/env/EB_B2B_COUNTRY_CODER
emote");
               EB_B2B_COUNTRY_CODERemote remote =
(EB_B2B_COUNTRY_CODERemote)home.create(country_code, country_code_desc,
country_phone_code,active_flag, phone_format_flag,user_created,
date_created, active_date, Sort_Order, user_modified,
date_modified,cntry_tax_prct);                              
          catch(Exception e)
               System.out.println("Error in Creating COUNTRY
Code "+e);
               throw new Exception("Error in Creating COUNTRY
Code "+e);
     public void setSessionContext(SessionContext context)
          this.context = context;
     public void ejbActivate()
     public void ejbPassivate()
     public void ejbCreate()
     public void ejbRemove()
The jsp client which acces the beans is as follows.
<BODY >
<%@ page language="java" %>
<%@ page import="java.sql.*" %>
<%@ page import="initcontext" %>
<%@ page import = "java.util.*" %>
<%@ page import="DB_UTILITYHome"%>
<%@ page import="DB_UTILITYRemote"%>
<%@ page import="javax.naming.*"%>
<%Connection con=null; %>
<script src="search_getvalues.js">
</script>
<form name=frm1>
<%! int intCount,intI,intRowCount,intJ;
String strtname=new String();
String strhidden=new String("txthdn");
     Statement st;
     ResultSet rs;
     ResultSetMetaData rmeta;
....%>
<%
try
     Context ctx = initcontext.getContext();
     DB_UTILITYHome dbhome =
(DB_UTILITYHome)ctx.lookup("java:comp/env/DB_UTILITYRemote");
     DB_UTILITYRemote dbremote = (DB_UTILITYRemote)dbhome.create();
     con=dbremote.getConnection();
     st=con.createStatement();
     rs=st.executeQuery(strsqlquery);
     rmeta=rs.getMetaData();
intCount=rmeta.getColumnCount();
....... %>
</form>
</BODY>
</HTML>
The resulting exception generated is as follows:
D:\oc4j\j2ee\home>java -jar orion.jar
Auto-unpacking
D:\oc4j\j2ee\home\applications\epool_CountryCode\build\epool_CountryCod
e.ear... done.
Auto-unpacking
D:\oc4j\j2ee\home\applications\epool_CountryCode\build\epool_CountryCod
e\epool_CountryCode-web.war... done.
Auto-deploying epool_CountryCode (New server version detected)...
Auto-deploying epool_CountryCode-ejb.jar (No previous deployment
found)... done.
Error deploying
file:/D:/oc4j/j2ee/home/demo/messagelogger/messagelogger-ejb.jar homes:
No javax.jms.Destination found a
t the specified destination-location (jms/theTopic) for
MessageDrivenBean com.evermind.logger.MessageLogger
Oracle9iAS (1.0.2.2.1) Containers for J2EE initialized
Auto-deploying epool countryCode example (New server version
detected)...
************************1
************************2
COUNT QUERY :SELECT COUNT(COUNTRY_CODE) FROM BAP_COUNTRY_CODE
QUERY :SELECT
COUNTRY_CODE,COUNTRY_CODE_DESC,COUNTRY_PHONE_CODE,PHONE_FORMAT_FLAG,COU
NTRY_TAX_PERCENT ,SORT_ORDER,ACTIVE
FLAG,ACTIVEDATE FROM BAP_COUNTRY_CODE order by COUNTRY_CODE
Error in selecting Country Code java.rmi.RemoteException: Error
(de-)serializing object: com.evermind.sql.OrionCMTConnec
tion; nested exception is:
java.io.NotSerializableException:
com.evermind.sql.OrionCMTConnection
JB:Error in selecting country cd java.lang.Exception: Error in
selecting Country Code java.rmi.RemoteException: Error (d
e-)serializing object: com.evermind.sql.OrionCMTConnection; nested
exception is:
java.io.NotSerializableException:
com.evermind.sql.OrionCMTConnection
Error in Selecting Records
OrionCMTConnection not closed, check your code!
LogicalDriverManagerXAConnection not closed, check your code!
(Use -Djdbc.connection.debug=true to find out where the leaked
connection was created)
Auto-unpacking
D:\oc4j\j2ee\home\applications\epool_CountryCode\build\epool_CountryCod
e.ear... Error unpacking: IO Error:
The system cannot find the path specified
Error updating application epool_CountryCode: Unable to find/read
assembly info for D:\oc4j\j2ee\home\applications\epool_C
ountryCode\build\epool_CountryCode (META-INF/application.xml)
But if the DBUTILITY session bean is changed to a simple bean and accessed the code works fine and i am able to retrieve the data.Is the problem there because u one session bean cannot access a database connection method from another one or could it be because of the driver???
I hope i am clear.Please revert back in case any more references are needed.
Thanks in advance!!!!!!