Help with EJB Arch: Synchronous front-end -- Asynchronous back-end

Hi folks, We are developing an application with the following characteristics: - users can invoke requests on our appl and they will expect a quick response - to obtain the information requested by the user, our application talks with Tibco using RV. This communication follows a pub/sub messaging paradigm and is asynchronous. - thus, we have a synchronous req/resp front-end and an asynch back-end.
We would like some advice as to the best way of architecting this application. Here is our approach. Please critic and suggest alternatives.
1. Consider an user who has requested something from our app. 2. The user will be using a JSP based front-end. (S)he submits the request on a form and a servlet is driven. 3. The servlet uses a session EJB and invokes one of its methods, which handles some business-specific logic. 4. The method in the session EJB then instantiates a helper class. 5. A method on our helper class is now driven. This method sends a message to Tibco and it provides a callback method in the helper class. 6. The method in the helper class blocks the thread - basically, it waits. 7. Meanwhile, Tibco does the processing and invokes the callback method (in the helper class) with the result. 8. In the callback method, the data sent by Tibco is stored in member variables of the helper class. 9. The callback method wakes up the blocking thread. 10. The method in step 6 wakes up and returns the information to the session EJB. 11. The session EJB returns the information to the invoking servlet. 12. The servlet provides the information back to the user.
The version of Tibco-RV that we are using is not JMS compliant.
We keep hearing that threads should be handled very carefully in an EJB container environment, so we would like to know if the way we are handling the thread in the helper class is okay. Could we remove the helper class and do the same thread-handling in the session EJB itself?
Can we use JMS in this solution even though our Tibco-RV does not support JMS?
Tools: Weblogic App Server 6.1, JBuilder 5.0.
Thanks for your advice and suggestions!

Let me start off by mentioning that Sonic MQ (an excellent JMS server) now provides a bridge for TIB/Rendezous. I am also wrestling with a simliar issue, something that requires threading at the servlet or ejb level, and have given some thought to using JMS. My concern was that JMS is an asynchronous process so it's model does not fit well with the synchronous front end. Technically I can see a few ways to implement it but architecturally I am not convinced that they are sound. You could send a message from the session bean to the TIB via SonicMQ and have a JMS message bean registered as a listener for messages from the TIB, again via SonicMQ. The JMS bean could update a static class or singleton which your session checks but you still have the issue of making the session bean wait on that event.
I'll do a bit more digging and see if there's a design pattern available for this situation.
-Dat

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Well, i wish to create a java class that can separate the view areas depending on their login.
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Hi,
Having a pool with two front-end servers (Lync Server 2013 on Windows Server 2012) and I cannot get one of servers to work properly.
The Front-End service is not starting.
Have removed both servers from the topology and installed one at the time. When adding the second server to the pool the service never starts, its in starting state and a bunch of error messages appears:
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Hi there,
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Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread

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Hi.
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Help with EJB plz

Hi,
I'm new to EBJs and am playing with an entity bean pretty much identical to the one on the J2EE tutorial but the home interface does not compile and I've got no idea why. Would really appreciate your help.
COMPILER COMPLAINT*****
C:\j2sdkee1.3\nim\src\ejb\addresses>javac AddressesHome.java
AddressesHome.java:7: cannot resolve symbol
symbol : class Addresses
location: interface AddressesHome
public Addresses Create(String id, String firstname, String lastname, St
ring address, int contactno) throws RemoteException, CreateException;
^
AddressesHome.java:10: cannot resolve symbol
symbol : class Addresses
location: interface AddressesHome
public Addresses FindByPrimaryKey(String id) throws FinderException, Rem
oteException;
^
2 errors
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import java.util.Collection;
import java.rmi.RemoteException;
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ADDRESSESSBEAN CLASS*****
import java.sql.*;
import javax.sql.*;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
public class AddressesBean implements EntityBean
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     private String firstname;
     private String lastname;
     private String address;
     private int contactno;
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          catch(Exception e)
               throw new EJBException("ejbLoad: " + e.getMessage());
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          try
               storeRow();
          catch(Exception e)
               throw new EJBException("ejbStore: " + e.getMessage());
     public void ejbPostCreate(String id, String firstname, String lastname, String address, boolean contactno)
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          DataSource ds = (DataSource) ic.lookup(dbName);
          conn = ds.getConnection();
     private void insertRow(String id, String firstname, String lastname, String address, int contactno) throws SQLException
          String insertStatement = "inset into ADDRESSES values (?, ?, ?, ?, ?)";
          PreparedStatement prepStmt = conn.prepareStatement(insertStatement);
          prepStmt.setString(1, id);
          prepStmt.setString(2, firstname);
          prepStmt.setString(3, lastname);
          prepStmt.setString(4, address);
          prepStmt.setDouble(5, contactno);
          prepStmt.executeUpdate();
          prepStmt.close();
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          String deleteStatement = "delete from ADDRESSES where id = ?";
          PreparedStatement prepStmt = conn.prepareStatement(deleteStatement);
          prepStmt.setString(1, id);
          prepStmt.executeUpdate();
          prepStmt.close();
     private boolean selectByPrimaryKey(String primaryKey) throws SQLException
          String selectStatement = "select id from ADDRESSES where id = ? ";
          PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
          prepStmt.setString(1, primaryKey);
          ResultSet rs = prepStmt.executeQuery();
          boolean result = rs.next();
          prepStmt.close();
          return result;
     private Collection selectByLastName(String lastname) throws SQLException
          String selectStatement = "select id from ADDRESSES where lastname = ? ";
          PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
          prepStmt.setString(1, lastname);
          ResultSet rs = prepStmt.executeQuery();
          ArrayList a = new ArrayList();
          while(rs.next())
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               a.add(id);
          prepStmt.close();
          return a;
     private void loadRow() throws SQLException
          String selectStatement = "select firstname, lastname, address, contactno from ADDRESSES where id = ?";
          PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
          prepStmt.setString(1, this.id);
          ResultSet rs = prepStmt.executeQuery();
          if(rs.next())
               this.firstname = rs.getString(1);
               this.lastname = rs.getString(2);
               this.address = rs.getString(3);
               this.contactno = rs.getInt(4);
               prepStmt.close();
          else
               prepStmt.close();
               throw new NoSuchEntityException("Row for id " + id + " not found in the dataBase");
     private void storeRow() throws SQLException
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          prepStmt.setString(1, firstname);
          prepStmt.setString(2, lastname);
          prepStmt.setString(3, address);
          prepStmt.setInt(4, contactno);
          prepStmt.setString(5, id);
          int rowCount = prepStmt.executeUpdate();
          prepStmt.close();
          if(rowCount == 0)
               throw new EJBException("Storing row for id " + id + " failed.");
}

EJB questions should be posted in the EJB forum! :=)
I did find the compiler message a bit strange. Usually if I don't have a class defined it complains that it cannot find package_name.class_name (when I'm using packages for my own code).

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My memory has slipped a bit: the following is more to the point than my reference to md=0!
Member
Registered: 2009-09-02
Posts: 17
E-mail
Re: [SOLVED] usb /boot, RAID5 /root, mkinitcpio.conf help request
The array stabalized and I was able to reboot with the following entry in my menu.lst:
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Offline

Help With EJB Client

I have successfully gotten my client to run when I use the appclient with the reference implementation. When I try to run my simple client outside of appclient I get the following error.
Exception: javax.naming.NameNotFoundException [Root exception is org.omg.CosNaming.NamingContextPackage.NotFound: I
DL:omg.org/CosNaming/NamingContext/NotFound:1.0]
I have my client.jar which is returned from the deploy tool, I have the j2ee.jar in my classpath, and I have my jndi name set up as ejb/Hello in the server. My code to access this is such:
public static void main(String[] args)
try
System.out.println("Adding properties");
Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL, "iiop://MyHost:3700");
Context initial = new InitialContext(env);
System.out.println("Got initial context!");
Object o = initial.lookup("java:comp/env/ejb/Hello");
System.out.println("got object from lookup");
HelloHome home = (HelloHome)PortableRemoteObject.narrow(o, com.tosht.ejb.HelloHome.class);
System.out.println("got home object back and did remote narrow cast");
Hello h = home.create();
System.out.println("got component interface");
System.out.println(h.sayHello());
System.out.println("called business method on component interface");
catch(Exception ex)
System.out.println("Exception: " + ex.toString());
I am sure this is a jndi issue, but in the deploy tool my applications jndi name for my component is ejb/Hello just as it is in code?
Any help would be greatly appreciated!!!!!

Hi Tim,
Couple things I can think of. 1) Are you sure that the ejb application deployed correctly? ejb/Hello does look like the right global JNDI name given the sun-ejb-jar.xml, so one explanation is that the ejb is not found because it wasn't deployed at all or wasn't deployed successfully. 2) It's worth double-checking that you have the correct client code compiled and found at runtime. Is it possible there is still the old version of the client main class that is looking up java:comp/env/ejb/Hello?
One final suggestion is to print the exception.printStackTrace() rather than exception.toString(). There is often very valuable information about the exception that is not printed out as part of toString().
--ken

Help with EJB & JNDI

I am getting following error while compiling EJB session client
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
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     at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
     at javax.naming.InitialContext.lookup(Unknown Source)
     at client.SimpleSessionClient.main(SimpleSessionClient.java:20)
My session client code is
package client;
import java.util.Hashtable;
import beans.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import javax.ejb.*;
import javax.naming.spi.InitialContextFactory;
import javax.naming.NamingException;
public class SimpleSessionClient {
     public static void main(String[] args) {
          try {
               Context jndiContext = new InitialContext();
               Object ref = jndiContext.lookup("ejb/beans.SimpleSession");
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               narrow(ref, SimpleSessionHome.class);
               SimpleSession simpleSession = home.create();
               for (int i=0; i<args.length; i++) {
                    String returnedString = simpleSession.getEchoString(args);
                    System.out.println("Sent String:" + args[i] +", " +
                              "recieved string" + returnedString);
          } catch(Exception e) {
               e.printStackTrace();
I have include j2ee.jar in the classpath too and I could deploy the EJB home and remote interface as well as Bean class in sun application server.
Any help wuld be appreciated.
Rashmi

I am using Sun App server for deploying EJB. In the same system, I am running eclipse where I run the EJB client with JNDI to connect to EJB component.
If this is not the right way, please suggest. I am trying to do this for the first time and completely clueless. I have tried to include different jar files in my classpath and even I am in the process of downloading websphere in case that could help me.

Help with EJB and JNDI, please

Hello. My name is Santiago, and i am a student from the University of Valladolid, in Spain. I am newcome in the world of EJB, I have done the first EJB from de Sun tutorial (I�m using the Sun Java System Application Server PE 8.2) and now I am trying to improve it in that way: I have the EJB and the client in diferent machines conected.
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This is my client�s code (part of it)
Hashtable envirom = new Hashtable();
envirom.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
envirom.put("java.naming.factory.url.pkgs","com.sun.enterprise.naming");
envirom.put(Context.PROVIDER_URL,"iiop://Santiago:389");
envirom.put(Context.PROVIDER_URL,"ldap://192.168.1.101:389");
envirom.put(Context.SECURITY_AUTHENTICATION,"none");
InitialContext ctx = new InitialContext(envirom);
Object objref = ctx.lookup("java:comp/env/ejb/Multiplica");
When I try to connect in local mode (client and EJB in the same machine) i get something like that:
javax.naming.CommunicationException: 192.168.1.101:389 [Root exception is java.n
et.ConnectException: Connection refused: connect]
at com.sun.jndi.ldap.Connection.<init>(Connection.java:204)
at com.sun.jndi.ldap.LdapClient.<init>(LdapClient.java:118)
at com.sun.jndi.ldap.LdapClient.getInstance(LdapClient.java:1578)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2596)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:283)
It is even worse when i try it in different machines:
10-mar-2006... com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImp1<init>
ADVERTENCIA: "IOP00410201: <COMM_FAILURE> Fallo de conexion: Tipo de socket: IIOP_CLEAR_TEXT;
name of host: portatil; puerto: 3700"
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code:201 completed:No
Both SSOO are XP and I have disabled Firewalls.
PLEASE, if you colud help me It would fantastic, because I am in that trouble, i have tryed 1000 solutions but i am not able to understand it.
Hoping you can help me.
Santiago.

This thread is now being followed up in:
http://swforum.sun.com/jive/thread.jspa?threadID=64092

Help with Transport control program tp ended with error code 0203

when i import queue and transport queue from dev to prd ,error show:
Transport control program tp ended with error code 0203
Message no. XT200
Diagnosis
An error occurred when executing a tp command.
Command: IMPORT DEVK900298 P01 clientP01 U0 pf=/usr/sap/tra
Return code: 0203
Error text: wrong syntax in tp call
Request: DEVK900298
System Response
The function terminates.
Procedure
Correct the error and execute the command again if necessary.

Thank you !
My DEV system TP profile parameters is :
TRANSDIR            = /usr/sap/trans
DEV/CTC             = 0
DEV/DBHOST          = P550A
DEV/DBLIBPATH       = /usr/sap/DEV/DVEBMGS01/exe
DEV/DBNAME          = DEV
DEV/DBTYPE          = ora
DEV/NBUFFORM        = 1
DEV/TP_VERSION      = 266
#System from Transport Domain DOMAIN_P01
#TMS:0002:DOMAIN_P01
P01/DUMMY           = 1
P01/NBUFFORM        = 1
P01/TP_VERSION      = 266
P01/CTC             = 1
My PRD system TP profile parameters is :
P01/CTC             = 0
P01/DBHOST          = XCPRD01
P01/DBLIBPATH       = /usr/sap/P01/DVEBMGS01/exe
P01/DBNAME          = P01
P01/DBTYPE          = ora
P01/NBUFFORM        = 1
P01/TP_VERSION      = 266
#System from Transport Domain DOMAIN_DEV
#TMS:0009:DOMAIN_DEV
DEV/DUMMY           = 1
DEV/NBUFFORM        = 1
DEV/TP_VERSION      = 266
DEV/CTC             = 1

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How do you reference a user-defined database function in an EJB Named Query. There doesn't seem to be any problems in using built in functions like max and min. Any help is greatly appreciated.

A little more information. It seems I have to retract one thing I said, I stated that the internal functions of the database were ok, this is incorrect. If I use the upper function in a named query I get the following.
example:
Internal Exception: Exception [TOPLINK-0] (Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build 060118)): oracle.toplink.exceptions.EJBQLException
Exception Description: Syntax Recognition Problem parsing the EJBQL [select object(o) from SysUsers o where o.racfId = :racfId and o.inactiveDate is null and upper(o.pswd) = :pswd]. The parser returned the following [unexpected token: upper].
In this example query I am trying to use the database upper function. Any Help?
Thanks

HELP with EJB to JSP Integration tool WLS 7.0

          Hi,
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          except for the page at http://edocs.bea.com/wls/docs70/jsp/ejb2jsp.html. It is
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          This is the error I get when trying to open an ejb.jar.
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          at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
          at weblogic.servlet.ejb2jsp.Utils.createBeanDescriptor(Utils.java:343)
          at weblogic.servlet.ejb2jsp.Utils.createDefaultDescriptor(Utils.java:314)
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          at weblogic.servlet.ejb2jsp.gui.Main.loadFromPaths(Main.java:391)
          at weblogic.servlet.ejb2jsp.gui.Main.doNew(Main.java:378)
          at weblogic.servlet.ejb2jsp.gui.Main$5.run(Main.java:575)
          at weblogic.servlet.ejb2jsp.gui.MainWorker.run(Main.java:757)
          at java.lang.Thread.run(Thread.java:479)
          error occurred: java.lang.NullPointerException
          java.lang.NullPointerException
          at weblogic.servlet.ejb2jsp.gui.Main.doNew(Main.java:379)
          at weblogic.servlet.ejb2jsp.gui.Main$5.run(Main.java:575)
          at weblogic.servlet.ejb2jsp.gui.MainWorker.run(Main.java:757)
          at java.lang.Thread.run(Thread.java:479)
          Is this error and the fix to it obvious to someone else? If so, I would appreciate
          some help!
          THank you!!
          Wendy


Try weblogic.servlet.ejb2jsp.gui.Main
Kris

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