EjbHome method vs stateless bean method
Does the ejbHome<method> and stateless bean method share the same concept?
Hi,
Basically the ejbHome<Method> will be the call onto the home object and it inturn uses the bean to make a call where as the stateless session bean method will be a call onto the ejb object.
So in the client code making a call you just make a looup and call the ejbHome<method> whereas in case of stateless session bean , you need to make a lookup and create and then use the object.
Hope this helps...
Bhgaya
Similar Messages
-
SessionSynchronization methods in Stateless Bean with BMP
Hi,
Why cant we use SessionSynchronization methods in Stateless Bean with BMP?
Just cos the bean has full control over the transactions and it doesnt make sense at all or there is something more to add to this.
Thanks in advance,
SeeteshHi,
Why cant we use SessionSynchronization methods in
Stateless Bean with BMP?Stateless Session Bean does not miantain the state across the method call.And the Transaction control is lying within the method call.
Just cos the bean has full control over the
transactions and it doesnt make sense at all or there
is something more to add to this.I dont understand what you are trying to say here.As stateful session bean maintains the state across the method calls and maintains the conversational state which lies is as cache.The Transaction can be aborted either by making the changes to old value and throwing the Exception to client indicating regarding the failure.But this will be great lost of work hence you make(find mechanism) a recovery from the old values which should be saved.
It is for this the specification has come up with SessionSynchronization interface (useful for only Stateful) Session Bean and with (declarative Transaction) CMT.
Regards
Vicky -
Call EJBHome method create() from C++
We have problem, when we call first EJBHome method create() from C++(using CORBA VisiBroker for C++ 4.3) : exception CORBA::BAD_OPERATION
Basically, I just want a C++ program to be a client of my java server (which already has a JNI layer).
Would IPC using sockets (both the client and the server will always be on the same host) be as efficient as shared memory or NamedPipes? -
i have a very simple stateless bean with a single "hello" method running in WL 8.1 sp3. to test out Weblogic's behavior, i ran 2 seaparate scenarios on 2 separate occasions. in the first one, i secured all bean methods. in the 2nd one, i secured only the home's "create" mthod, while explicitely denoting all remote methods as "unchecked". next, i wrote a standalone client class where the aforemention bean's EJBHome.create() is called from within a PrivilegedAction-inherited class, while hello() method is called straight up without the use of PrivilegedAction. moreover, the hello() method also prints out the SessionContext.getCallerPrincipal().getName(). finally, an UNsecured servlet utilizing that class was deployed in Tomcat5 and another instance of Weblogic. this is where is gets interesting. when executing the standalone class or the Tomcat's servlet in both scenarios, the results are the same: both create() and hello() get called without a problem, while the latter method prints out correct principal name. however, Weblogic hosting the unsecured servlet behaves differently (and undesirably). in the first scenario where all methods are secured, create() is allowed to be executed, but calling hello() results in an insufficient privileges error. in the 2nd scenario, where only create() method is secured, Weblogic allows hello() to be called without a problem. however, the principal that it returns is "anonymous". my question is how is it possible for not only Tomcat, but even a standalone class to call a secured method without the use of PrivilegedAction and get back a correct principal? yet when absolutely identical code is called from another Weblogic instance, i cannot even obtain a correct principal despite the use of PrivilegedAction!!!
thanks!Hi "werwer" (or is that "wer" :-),
I haven't checked the forum archives, so I may have already mentioned
this to you (or I may have already mentioned it to someone else
on this forum), but there are many resources available on the
Internet that can answer nearly all your J2EE related questions!
I would like to mention two. (If you already know about them, then
I suggest you study them. If you have already studied them and
still don't know the difference between a stateful and a stateless
session bean, then perhaps you can be a bit more specific about
what, in particular, you are having difficulty with.)
1. "Mastering Enterprise JavaBeans" by Ed Roman
A book that you can download as a PDF file.
http://www.theserverside.com/books/masteringEJB/index.jsp
(Also look for the companion book -- at the same URL -- "EJB
Design Patterns")
Note that you need to become a "member" in order to download
these books -- but registration is free.
2. "Enterprise Java Beans, 3rd Edition" by Richard Monson-Haefel
This is an online book -- that you cannot download!
http://safari.informit.com/main.asp?bookname=entjbeans3
Note that "Safari" (at "InformIT") are offering a free, two-week
trial subscription.
Hope this helps you.
Good Luck,
Avi. -
CacheFullException with Stateless bean
Hallo everbody,
I have a problem with a Stateless bean the log file give me this error:
javax.ejb.EJBException: Exception during transition from pooled to ready:
- with nested exception:
[weblogic.ejb20.cache.CacheFullException: Cache is at its limit of: '100' *active*
beans.]
I use this bean for several action, and just for an action I have this error.
What I can't underastand that Stateless bean get with the session and as the user
close the session the Bean have to expire, isn'it? So can't uderstand while 100
Bean still on the cache.
Could anyone help me?
Thank's a lot
Fausta1. check thread dump ... any threads actually still busy?
2. is it stateful or is it stateless? I don't mean how do you deploy it, but
I mean which is it really? does it have any state?
3. always call remove() ... this isn't the problem (Weblogic doesn't require
remove()) but you should do so anyway.
Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"Sachin Shah" <[email protected]> wrote in message
news:[email protected]..
>
Hi,
I have a statelesss session bean which i m using in the application.Initially
this bean was stateful bean but due to problems of timeout it was changedto stateless
bean. The problem is sometimes when i view the statistics from console, ifind
that there are max 20 beans allowed and all 20 are in use. Because ofwhich no
user can work further and i have to shutdown the server. I fail tounderstand
this cause being a stateless session bean it should be released (returnedto free
pool) as soon as the method is over. So why this behaviour. Any idea.
Thanks in Advance -
Performance of Session Stateless Bean in WebSphere with connection to DB
Im using WebSphere Advanced Single Server Edition Version 4.0.1. and a WebSphere DataSource to get my connections to Microsoft SQL 2000 (using netdirect's JSQLDriver).
For the EJB I set the transaction to 'requieresNew'.
For testing purposes I had been testing some code I'll be using in a Session Stateless Bean inside a servlet's method. In my servlet I use one single connection and preparedStatements to improve performance.
When I test it on the Servlet, this process takes around 3 minutes to complete, but when I put this code inside a Session Stateless Bean and call it from this servlet's method, it takes around 30 minutes to complete!. How is this possible?!
Worst of all, when the EJB ends and the process returns to the Servlet, it throws me this exception.
com.ibm.websphere.ce.cm.StaleConnectionException: class com.ibm.ejs.cm.proxy.PreparedStatementProxy is closed.
The code uses some utilities from a Framework we created, but I really doubt it affects the performance since I put such classes in a jar file and the EJB is accessing such classes correctly.
I thought that maybe I was missing something related with how I get the connection inside the EJB, but I had no luck trying to figure this out.
This is the code in my EJB, commented code was in use when this code was tested in the method of the servlet (some code has been removed or modified, so I just left the 'main' body of the code):
package cmx.ejb;
import cmx.common.*;
import java.util.*;
import qsi.sys.db.*;
import qsi.sys.util.*;
import java.rmi.*;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
import javax.rmi.*;
import javax.sql.DataSource;
* Bean implementation class for Enterprise Bean: SimuladorEJB
public class SimuladorEJBBean implements javax.ejb.SessionBean {
private javax.ejb.SessionContext mySessionCtx;
private Context ctx;
private DataSource ds;
private static final int TCONSUMO = 4;
private static final int CARACEQ = 6;
private static final int PPRODUC = 9;
private static final int PPUNTA = 12;
private static final int UTONHR = 8;
private static final int TPRODUCC = 3;
private Vector val = null;
private Vector vecArea = null;
private String query;
private Object[] params;
private int numAreas;
private int vSecDetHE;
//All the prepared statements I'll use in my process
private PreparedStatement pstmSelectSerial = null;
private PreparedStatement pstmUpdateSerial = null;
private PreparedStatement pstmgetPPEquipos = null;
private PreparedStatement pstmgetTransfers = null;
private PreparedStatement pstmaddRProduccion = null;
private PreparedStatement pstmupdInventario = null;
private PreparedStatement pstmgetServicios = null;
private PreparedStatement pstmaddConsumo = null;
private PreparedStatement pstmgetAreaEquipos = null;
private PreparedStatement pstmfindCE = null;
private PreparedStatement pstmcontEventoLogEq = null;
private PreparedStatement pstmaddLog = null;
private PreparedStatement pstmfindCaract = null;
private PreparedStatement pstmfindComposicion = null;
private PreparedStatement pstmfindCombAlt = null;
private PreparedStatement pstmaddInventarioH = null;
private PreparedStatement pstmgetAlmMatREM = null;
private PreparedStatement pstmfindAlmacen = null;
private PreparedStatement pstmcontEventoLogAlm = null;
private PreparedStatement pstmgetAlmacenes = null;
private PreparedStatement pstmfindInvHora = null;
private PreparedStatement pstmgetPeriodoHorario = null;
private PreparedStatement pstmgetProgramaCE = null;
private PreparedStatement pstmgetProgramaPP = null;
private PreparedStatement pstmgetProgramaParo = null;
private PreparedStatement pstmgetPrograma = null;
* getSessionContext
public javax.ejb.SessionContext getSessionContext() {
return mySessionCtx;
* setSessionContext
public void setSessionContext(javax.ejb.SessionContext ctx) {
mySessionCtx = ctx;
* ejbActivate
public void ejbActivate() {
* ejbCreate
public void ejbCreate() throws javax.ejb.CreateException {
System.out.println("ejbCreate()");
try {
Hashtable parms = new Hashtable();
parms.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory");
ctx = new InitialContext(parms);
ds = (DataSource)ctx.lookup("jdbc/datasource");
}catch (Exception e){
e.printStackTrace();
* ejbPassivate
public void ejbPassivate() {
* ejbRemove
public void ejbRemove() {
System.out.println("ejbRemove()");
pstmSelectSerial = null;
pstmUpdateSerial = null;
pstmgetPPEquipos = null;
pstmgetTransfers = null;
pstmaddRProduccion = null;
pstmupdInventario = null;
pstmgetServicios = null;
pstmaddConsumo = null;
pstmgetAreaEquipos = null;
pstmfindCE = null;
pstmcontEventoLogEq = null;
pstmaddLog = null;
pstmfindCaract = null;
pstmfindComposicion = null;
pstmfindCombAlt = null;
pstmaddInventarioH = null;
pstmgetAlmMatREM = null;
pstmfindAlmacen = null;
pstmcontEventoLogAlm = null;
pstmgetAlmacenes = null;
pstmfindInvHora = null;
pstmgetPeriodoHorario = null;
pstmgetProgramaCE = null;
pstmgetProgramaPP = null;
pstmgetProgramaParo = null;
pstmgetPrograma = null;
public void GenerarSimulacion(int pidSimulacion, String pfini, String pffin, int cveEntidad, int cveUsuario) throws Exception{
System.out.println("GenerarSimulacion()");
System.out.println("***Simulacion " + pidSimulacion + " en proceso...***");
Calendar inicioProceso = Calendar.getInstance();//Tiempo en que empezo el Proceso
Calendar finProceso = null;//Tiempo en que termino el Proceso
Connection cnn = null;
//boolean autoCommit = false;
try{
cnn = ds.getConnection();
autoCommit = cnn.getAutoCommit();
cnn.setAutoCommit(false);
cnn.setTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
pstmSelectSerial = cnn.prepareStatement("select iValor from CatConsecutivo where vcConsecutivo=?");
pstmUpdateSerial = cnn.prepareStatement("update CatConsecutivo set iValor = iValor+1 where vcConsecutivo=?");
pstmgetPPEquipos = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getPPEquipos"));
pstmgetTransfers = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getTransfers"));
pstmaddRProduccion = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.addRProduccion"));
pstmupdInventario = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.updInventario"));
pstmgetServicios = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getServicios"));
pstmaddConsumo = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.addRConsumo"));
pstmgetAreaEquipos = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getAreaEquipos"));
pstmfindCE = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findCE"));
pstmcontEventoLogEq = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.contEventoLogEq"));
pstmaddLog = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.addLog"));
pstmfindCaract = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findCaract"));
pstmfindComposicion = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findComposicion"));
pstmfindCombAlt = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findCombAlt"));
pstmaddInventarioH = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.addInventarioH"));
pstmgetAlmMatREM = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getAlmMatREM"));
pstmfindAlmacen = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findAlmacen"));
pstmcontEventoLogAlm = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.contEventoLogAlm"));
pstmgetAlmacenes = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getAlmacenes"));
pstmfindInvHora = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.findInvHora"));
pstmgetPeriodoHorario = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getPeriodoHorario"));
pstmgetProgramaCE = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getProgramaCE"));
pstmgetProgramaPP = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getProgramaPP"));
pstmgetProgramaParo = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getProgramaParo"));
pstmgetPrograma = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getPrograma"));
pstmgetAreaEquipos = cnn.prepareStatement(Manager.getParameter("cmx.admin.inicioSesion.getAreaEquipos"));
Map hmEqMat = null;
Iterator itEqMat = null;
Map.Entry meEqMat = null;
Map hmInvAlm = null;
Iterator itInvAlm = null;
Map.Entry meInvAlm = null;
Map hmPunta = null;
Iterator itPunta = null;
Map.Entry mePunta = null;
Iterator itPuntaEq = null;
HashMap hmPuntaEq = null;
Vector vecPuntaEq = null;
Iterator itPPEq = null;
HashMap hmPPEq = null;
Vector vecPPEq = null;
Iterator itCar = null;
HashMap hmCar = null;
Vector vecCar = null;
Iterator itLog = null;
HashMap hmLog = null;
Vector vecLog = null;
Iterator itCA = null;
HashMap hmCA = null;
Vector vecCA = null;
Iterator itCom = null;
HashMap hmCom = null;
Vector vecCom = null;
Iterator it = null;
HashMap hm = null;
Vector vecEv = null;
Iterator itEq = null;
HashMap hmEq = null;
Vector vecEq = null;
Vector vecSim = null;
Date d;
String sDSim = "";
Date dDiaPrevio;
String sDiaPrevio = "";
String consulta;
int vContador= 0;
int hr=0;
long vDiaPrevio = 0;
Integer idInvH;
Integer idProd;
Integer idCons;
Integer idLog;
int vCont = 0;
int vCiclo = 0;
int vArea = 0;
int vAreaAct = 0;
int vPuntaEquipo = 0;
// Periodo de Simulacion
long fini = getCurrDate(pfini);
long ffin = getCurrDate(pffin);
// Variables Generales
int vSecuencial = 0;
int vEvento = 0;
float vCostoE = 0;
int vAlmacenREM = 0;
// Variables de Transferencia
float vCantidad = 0;
int vTipoMov = 0;
int vUMedida = 0;
int vAlmacenTr = 0;
float vNIni = 0;
float vNMin = 0;
float vNMax = 0;
float vNAct = 0;
// Variables de Equipos
int vPPMaterial = 0;
int vPPEquipo = 0;
int vPPArea = 0;
int vMaterial = 0;
int vCaractEq = 0;
int vParo = 0;
int vEstatusParo = 0;
int vEstatus = 0;
float vMinPunta = 0;
float vPorcPunta = 0;
float vProporcion = 0;
float vTPH = 0;
float vGasto = 0;
float vKwNoProd = 0;
float vKwProd = 0;
int vAlmacen = 0;
// Variables de Composicion de Materiales
int vMaterialCom = 0;
float vPorcCom = 0;
float vFactorCC = 0;
int vTipoMovCom = 0;
int vUMedidaCom = 0;
int vAlmacenCom = 0;
float vNIniCom = 0;
float vNMinCom = 0;
float vNMaxCom = 0;
float vNActCom = 0;
int vMaterialCA = 0;
int vUMedidaCA = 0;
int vAlmacenCA = 0;
float vNIniCA = 0;
float vNMinCA = 0;
float vNMaxCA = 0;
float vNActCA = 0;
int vOk=0;
int h=0;
boolean vbOk=false;
boolean swArea=true;
Calendar dtH1;
vecSim = new Vector();
vecSim.add(new Integer(pidSimulacion));
for (long ld=fini; ld<=ffin; ld=getNextDate(new Date(ld), 1))
{ d = new Date(ld);
//The process which calls find(), upd(), AplicaEvento() and GetCostoEnergia() methods several times.
//The methods find() and upd() uses a util class (DataDB) which basically assigns the params to the PreparedStatement and executes it, returning the results in a Vector.
} // for ld : Dia de Simulacion
//Cerrar la transaccion
}catch (Exception e){
System.out.println("rollback...");
mySessionCtx.setRollbackOnly();
System.out.println("rollback ok!");
System.out.println(e.toString());
throw e;
}finally{
finProceso = Calendar.getInstance();
finProceso.setTime(new java.util.Date(finProceso.getTime().getTime() - inicioProceso.getTime().getTime()));
System.out.println("***Simulacion " + pidSimulacion + " procesada en: " + finProceso.get(Calendar.MINUTE) + ":" + finProceso.get(Calendar.SECOND) + "." + finProceso.get(Calendar.MILLISECOND) + ".***");
try {
if (cnn!=null && !cnn.isClosed()) {
System.out.println("close ok?");
cnn.close();
System.out.println("close ok!");
}catch (SQLException sqle){
sqle.printStackTrace();
System.out.println("commit ok?");
cnn.commit();
System.out.println("commit ok!");
}catch (Exception e){
e.printStackTrace();
System.out.println(e.toString());
try {
if (cnn!=null && !cnn.isClosed()) {
System.out.println("rollback ok?");
cnn.rollback();
System.out.println("rollback ok!");
}catch (SQLException sqle){
sqle.printStackTrace();
}finally{
finProceso = Calendar.getInstance();
finProceso.setTime(new java.util.Date(finProceso.getTime().getTime() - inicioProceso.getTime().getTime()));
System.out.println("Simulacion procesada en: " + finProceso.get(Calendar.MINUTE) + ":" + finProceso.get(Calendar.SECOND) + "." + finProceso.get(Calendar.MILLISECOND) + ".***");
try {
if (cnn!=null && !cnn.isClosed()) {
System.out.println("autocommit ok?");
cnn.setAutoCommit(autoCommit);
System.out.println("autocommit ok!");
System.out.println("close ok?");
cnn.close();
System.out.println("close ok!");
}catch (SQLException sqle){
sqle.printStackTrace();
private float GetCostoEnergia(float pfKw, long plFecha, int piHora,int cveEntidad) throws Exception {
float exito = -1;
//calculations and has access to DB throught method find()
return exito;
private int AplicaEvento(int pidMaterial, int pidEvento, int pidSecuencial, int pidSimulacion, long plFecha, int piHora) throws Exception {
int exito = -1;
//calculations and has access to DB throught method find()
return exito;
private Iterator find(PreparedStatement pstm, Vector values) throws Exception {
params = (values!=null)? values.toArray() : null;
Vector data = DataDB.executeQuery(pstm, params); //This util class is in a external jar file, such util basically assigns the params to the PreparedStatement and executes it, returning the results in a Vector.
return data.iterator();
private int upd(PreparedStatement pstm, Vector values) throws Exception {
params = values.toArray();
return DataDB.executeUpdate(pstm, params); //This util class is in a external jar file, such util basically assigns the params to the PreparedStatement and executes it.
Help will be REALLY appreciated!
Thanks in advance.Thanks Paul for your comments.
In fact, I call my EJB in the servlet just once. Im sure calling the same EJB. My project requieres it to be stateless.
This is my last log
1/2/03 13:15:00:481 CST] 17fac55b SystemOut U -ejbCreate()-
[1/2/03 13:15:00:591 CST] 17fac55b SystemOut U jdbc/xa/oye
[1/2/03 13:15:00:651 CST] 17fac55b SystemOut U -GenerarSimulacion()-
[1/2/03 13:15:00:741 CST] 17fac55b SystemOut U ***Simulacion 32 en proceso...??***
[1/2/03 13:15:01:012 CST] 17fac55b SystemOut U JSQLConnect(2.2721) Trial license - expires on:Tue Jan 07 13:01:32 CST 2003, unlimited connections
[1/2/03 13:15:01:092 CST] 17fac55b SystemOut U Connection OK!
[1/2/03 13:15:01:392 CST] 17fac55b SystemOut U PreparedStatements OK!
[1/2/03 13:15:01:402 CST] 17fac55b SystemOut U Comenzando Sim...
I forgot to mention that I create a connection (autocommit false) at the begining of my servlet, which I use throught all the servlet, then I call the EJB, and after the EJB succeds I also close the transaction in the Servlet (to commit what is on the servlet, not the EJB). Thats why I set the transaction in the EJB to requiresNew, so after the EJB ends it commits its own transaction, Am I right?.
The Exception I get I think its because the connection used in the servlet timed out while waiting for the EJB to finish.
This issue has become urgent, so please if you know why I have this problem reply ASAP.
Thanks! -
Unable to rollback using BMT in a stateless bean
Hi,
My stateless bean contains the following testing code
UserTranaction ut = null;
try{
ut = context.getUserTransaction();
ut.begin();
// get database connection from OracleDataSource
// via container
// update a recored in db
if (true)
throw new Exception();
ut.commit();
} catch (Exception e){
ut.rollback();
} finally {
// close connection
I am using oracle 817 jdbc driver and when I execute the method,
the changes in DB are not rolledback and there is no exception
thrown. My questions are
1). Is BMT really work in oc4j? Anyone try before?
2). Is there any additional conditions/setting need to be done
in order to make BMT work? such as dataSource setting, database
configuration...
3). Could anyone provide sample code with related settings?
(especially what datasoure u are using)
Thank you very much!!!Have you already tried to load the class like this:
Thread.currentThread().getContextClassLoader.loadClass(actionName);
Instead of using the same classloader that loaded your bean implementation, it uses the classloader given to the executer thread as the context classloader.
(In many cases this will be the same, but I don't know how this is done in the implementation of your container). -
Exception while getting the server instance. Stateless bean problem
Hi,
New to OC4J, I'm moving an ear that was running ok under jboss.
1- The wep app deploys. This is a piece of code inside the init() method of a struts plugin:
System.out.println("0");
AddressFacadeHome addressFacadeHome = HomeFactory.getAddressFacadeHome();
System.out.println("1.0");
AddressFacade addressFacade = addressFacadeHome.create();
System.out.println("1.5");
2- The code is run when the web app is initialized. This is the error message I get. system.out show that the error occurs on addressFacadeHome.create().
AddressFacade is a remote/local stateless bean. HomeFactory returns the jndi lookup/narrow of the remote object.
0
1.0
caught exception while getting the server instance null
java.lang.NullPointerException
com.evermind.security.User com.evermind.server.ThreadState.getCurrentUser()
ThreadState.java:637
com.evermind.security.User com.evermind.server.ThreadState.getUser()
ThreadState.java:371
fda.common.address.ejb.interfaces.AddressFacade AddressFacadeHome_StatelessSessionHomeWrapper7.create(
AddressFacadeHome_StatelessSessionHomeWrapper7.java:66
void fda.web.oaa.struts.plugin.ApplicationInit.init(org.apache.struts.action.ActionServlet, org.apache
.struts.config.ModuleConfig)
void org.apache.struts.action.ActionServlet.initModulePlugIns(org.apache.struts.config.ModuleConfig)
ActionServlet.java:1105
void org.apache.struts.action.ActionServlet.init()
ActionServlet.java:468
void javax.servlet.GenericServlet.init(javax.servlet.ServletConfig)
GenericServlet.java:258
com.evermind.server.http.ServletInstanceInfo com.evermind.server.http.HttpApplication.loadServlet(com.
evermind.util.ByteString)
HttpApplication.java:1956
com.evermind.server.http.ServletInstanceInfo com.evermind.server.http.HttpApplication.findServlet(com.
evermind.util.ByteString)
HttpApplication.java:4355
void com.evermind.server.http.HttpApplication.initPreloadServlets()
HttpApplication.java:4455
void com.evermind.server.http.HttpApplication.initDynamic(com.evermind.server.http.HttpApplicationConf
ig)
HttpApplication.java:662
void com.evermind.server.http.HttpApplication.<init>(com.evermind.server.Application, com.evermind.ser
ver.http.HttpSite, com.evermind.server.http.HttpApplicationConfig, java.lang.String, java.lang.String, boolean
My guess is that it's a jaas issue (because i see security and getCurrentUser), but at init time, no user is authenticated.
Any clue would be very much appreciated. Let me know if I can provide anything else, such as deployment descriptors.
Thanks,
Christophe.After spending some time on this, I looked at the source code for com.evermind.server.ThreadState
This is the code that throws the exception:
if(applicationThread != null && applicationThread.httpHandler != null && applicationThread.servletInfo != null)
try
server = applicationThread.httpHandler.request.getApplication().getApplication().getServer();
catch(Throwable t)
System.out.println("caught exception while getting the server instance " + t.getMessage());
t.printStackTrace(System.out);
It looks like this method expects a httpRequest, and would find null because I'm in the servlet.init()
(at least, that's my interpretation)
I tested my code (the remoteFacade.create()) inside of a jsp, and it worked...
So, the next logical question is:
Can I make EJB calls from within the init method of a servlet? (or more specifically from a struts plugin, which I believe should be more or less the same thing)
If so, do I need to take extra steps?
Again, any experience/help on this will be much appreciated.
Thanks,
Christophe. -
Stateless Bean - Web Service Context
Is there anyway to specify the root context of a stateless bean that is also annotated as a webservice
Example
@Stateless
@Local(**)
@LocalHome(**)
@WebService(**)
@WLHttpTransports(contextPath="rootPath", serviceUri="uri")
Normally i would expect this to be accessible through http://host:port/rootPath/uri?WSDL
This format does work without the session bean if ran through Weblogics Generators, but is it possible to do the same thing with a bean? Or if it's not possible using WLHttpTransports what would the other method be?
Thank youuser8008029,
The WLS JAX-WS stack does not support all of the proprietary annotations from the JAX-RPC stack. This annotation (@WLHttpTransports) is one example. However, you can still override the context and service mapping using descriptors.
The descriptor is [weblogic-webservices.xml|http://e-docs.bea.com/wls/docs103/webserv_ref/dd.html] ...
Here is a sample:
<?xml version='1.0' encoding='UTF-8'?>
<weblogic-webservices xmlns="http://xmlns.oracle.com/weblogic/weblogic-webservices" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-webservices http://xmlns.oracle.com/weblogic/weblogic-webservices/1.0/weblogic-webservices.xsd">
<webservice-description>
<webservice-description-name>YourEJBService</webservice-description-name>
<webservice-type>JAXWS</webservice-type>
<port-component>
<port-component-name>YourPort</port-component-name>
<service-endpoint-address>
<webservice-contextpath>rootPath</webservice-contextpath>
<webservice-serviceuri>/uri</webservice-serviceuri>
</service-endpoint-address>
</port-component>
</webservice-description>
</weblogic-webservices>
Note: you may use the <WLHTTPTransport/> element with the [ jwsc ant task|http://e-docs.bea.com/wls/docs103/webserv_ref/anttasks.html#wp1069899] . This will build your service and automatically create the appropriate descriptors.
Ryan -
Question about conversational state of Stateless bean....
Hello all,
I have a simple stateless bean which parses an XML file and stores the xml content as an list of 2-D arrays in member variables. Here is quick look at design...
import javax.ejb.Stateless;
// included other libraries
import java.util.List;
import java.util.ArrayList;
@Stateless
public class XMLParseBean implements XMLParseBeanInterface {
public List<String> strParameters;
public List<String> getStrParameters() {
return strParameters;
private void setStrParameters(List<String> strParameters) {
this.strParameters = strParameters;
public void parseXML(String strFileName) {
/* Open the XML file and do initializations for xml parsing here
setStrParameters(visitNode(doc.getDocumentElement()));
private List<String> visitNode(Element thisNode) {
/* Parse the XML here */
return strNodes; // return the node names and their values
}My question is : if I inject this bean in another bean, call the method for parsing XML and then call the getParameter method to access the value of member variable, will it work.
I mean since I am using stateless bean, does the conversation state end when the parseXML method ends?sir_edward wrote:
Hi vikram8jp,
The session of an stateless bean ends after a method call. If you call a method of your bean, the bean will forget all attributes when the method ends. If you want to save attributes, you have to use a stateful bean.
Regards
Sir EdwardHello Sir Edward,
That answers my query. -
Stateless bean transaction rollback
HI Friends
Iam using a stateless bean.In which some of the methods are in
transaction having transaction attribute is "supports". Now i have a method
A which is updating some table and iam calling another method "B" which is
updating another table.but B method is using another connection. Iam using a
txdatasource. If methods are in transaction if any exception occurs it
should rollback.But is was not happening.
A() {
new connection();
con.close()
B()
new Connection()
con.close();
can u help me
Thank you Salvo.I think the only way is to pass the same connection to the
private method.
"Jesus M. Salvo Jr." <[email protected]> wrote in message
news:[email protected]...
> AFAIK, no, because the container does not know about those methods. The
> public methods in the remote interface are the only methods that the
> container manages transaction for. Besides, why would the container handle
> transcation for private methods when private methods cannot be called
> remotely?
>
> However, calling a private method internally within method that was called
> remotely will make the container treat them as one transaction. Your
> private method should probably throw a SQLException, which your public
> method catch and rethrow as an EJBException.
>
> Jetty wrote:
>
> > Other method is private method.
> > It is possible to set transaction attribute for private methods.?
> >
> >
> > "Jesus M. Salvo Jr." <[email protected]> wrote in message
> > news:[email protected]...
> >> In SLSB, one method is one transaction .... unless of course that
method
> >> was called by another EJB that started the transaction. It then depends
> >> on how you haved setup your TX attributes.
> >>
> >> If the method in the SLSB was called from say a servlet, and the bean
is
> >> a container-managed transaction, then that method call is one
> >> transaction.
> >>
> >>
> >> Jetty wrote:
> >>
> >> > Update statements in each method will it come under one transaction.?
> >> >
> >> > "Jesus M. Salvo Jr." <[email protected]> wrote in message
> >> > news:[email protected]...
> >> >> How did you A call B?
> >> >>
> >> >> 1) Did you do create another instance of the SLSB and call B?
> >> >>
> >> >> 2) Or did you simply call B from A via this.B() ?
> >> >>
> >> >> If its 1), then each method will be handled separetely by the
> > container.
> >> > If
> >> >> its 2), the container will only see your call to A, therefore just a
> >> > single
> >> >> transaction.
> >> >>
> >> >> Weblogic news server wrote:
> >> >>
> >> >> > HI Friends
> >> >> > Iam using a stateless bean.In which some of the methods are
> >> >> > in
> >> >> > transaction having transaction attribute is "supports". Now i have
a
> >> >> > method A which is updating some table and iam calling another
method
> >> >> > "B" which is updating another table.but B method is using another
> >> > connection.
> >> >> > Iam using a txdatasource. If methods are in transaction if any
> >> >> > exception occurs it should rollback.But is was not happening.
> >> >> > A() {
> >> >> > new connection();
> >> >> > con.close()
> >> >> > }
> >> >> > B()
> >> >> > ()
> >> >> > {
> >> >> > new Connection()
> >> >> > con.close();
> >> >> > }
> >> >> >
> >> >> > can u help me
> >> >> >
> >> >> >
> >> >> >
> >> >>
> >> >
> >> >
> >> >
> >>
> >
> >
> >
>
-
ExecutorService in Stateless bean
Hi,
I am worried about the EJB container's behavior when it is executing a ExecutorService. In short, the service is spawning threads to run a massive task concurrently and await the result of that. So, if the bean is waiting for result (FutureTask) can it be passivated by the container? And if so, what would that mean for the spawned threads? Will they be interrupted?
Can someone explain to me what will happen and not?
Thanks in advance,
MikeHello,
If you are using the stateless session bean, then firstly it will never passivate. Secondly, if you are instantiating one or more threads from the stateless bean, then calling of your stateless session bean's method and further threads (from that method) would be in the same transaction, so your bean's intsance would remain active until the transaction completes. So nothing would be interupted.
Hope this answers your question.
Thanks
Gaurav -
EJB 3.0 Stateful bean not saving state while Stateless bean is !!!
My Stateless bean is as follow:
package test;
import javax.ejb.Stateless;
@Stateless(mappedName = "StatelessBean")
public class StatelessBean implements StatelessBeanRemote {
int counter;
public void increment(){
System.out.println("Stateless counter value:"+counter);
counter++;
My Stateful bean is as follow:
package test;
import javax.ejb.Stateful;
@Stateful(mappedName = "StateFulBean")
public class StateFulBean implements StateFulBeanRemote {
int counter;
public void increment(){
System.out.println("Stateful counter value:"+counter);
Client is as follows:
package test;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
public class TestClient {
public static void main(String[] args) {
Hashtable hashtable = new Hashtable();
hashtable.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
hashtable.put(Context.PROVIDER_URL, "t3://localhost:7001");
InitialContext ic;
try {
ic = new InitialContext(hashtable);
StateFulBeanRemote stateFulBeanRemote = (StateFulBeanRemote)ic.lookup("StateFulBean#test.StateFulBeanRemote");
stateFulBeanRemote.increment();
StatelessBeanRemote statelessBeanRemote = (StatelessBeanRemote)ic.lookup("StatelessBean#test.StatelessBeanRemote");
statelessBeanRemote.increment();
} catch (Exception e) {
e.printStackTrace();
The output i am getting after running the client twice is as follows:
//first time
Stateful counter value:0
Stateless counter value:0
//second time
Stateful counter value:0
Stateless counter value:1
Shouldn't the counter values be incremented in case of Stateful bean and remain the same for Stateless bean. But the output that I am getting is the complete opposite !!!
Can anyone please explain this confusing behavior of stateless and stateful ejb 3.0 beans.868664 wrote:
Can anyone please explain this confusing behavior of stateless and stateful ejb 3.0 beans.It is very simple: a stateless bean is ASSUMED to be stateless; you cannot keep state in a stateless bean as a contractual rule. That doesn't mean that you will fail to keep state in them at least for a little while, they are still only Java objects. Generally stateless EJBs are pooled, so you may get the same instance each time you use such an EJB, but you may just get another one. It is not dependable and the rules say don't do it - so don't do it.
A stateful bean is tied to a single client, and so can be used by a client to keep state in it. Since You are running the client application twice you are operating with two different clients and so you will get a new stateful bean each time and your code will keep printing 0. However there is also a bug in your code:
public void increment(){
System.out.println("Stateful counter value:"+counter);
}You are not incrementing anything. -
Stateless Bean - scope of instance variable in EJB Timer call back function
Hi,
I would like to know on the scope of an instance variable of a Stateless Bean object,
when used in a EJB Timer call back.Let me explain this in more detail below.
I have a requirement to use a EJB Timer.
For this, I have created a stateless object since Timer creation needs to be done
from a stateless bean. I have a member variable "count" of the stateless bean class.
In the timer call back(ejbTimeout), I am able to use this count variable during
each time of the call back, and the value of this variable is also updated properly.
I have a few queries with respect to the above behaviour:
1) Does stateless bean object not get destroyed once the Timer is created from the Bean?
2) If the Bean object is not destroyed, then when does the bean object get destroyed?
3) If both (1) and (2) are not true, then can anyone explain on how the above behaviour is possible?
Thanks in advance,
UlrichHi Ulrich,
The ejb timer is associated with the stateless session bean component, not with a particular bean instance. There is no formal relationship between the bean instance that called createTimer() and the bean instance on which the timer callback happens. If they're the same in your test run that's just a coincidence and not something your application should be depending on.
In the stateless session bean model, the container can create and destroy stateless session bean instances at any time. The container is free to pick any stateless session bean instance to service any client invocation or timer callback. If you need to pass context into a timer callback, one way to do it is via the timer "info" object. However, the info object is immutable so it wouldn't be a good match for a counter. You could of course always just use a database for any necessary coordinated state.
--ken -
Stateless bean giving error when deployed through j2ee 1.3RI
I have written a simple stateless bean and deployed through j2ee 1.3 RI
Context initial = new InitialContext(h);
Object obj = initial.lookup("SampleObject"); // SampleObject -jndi name
SampleHome home = (SampleHome)PortableRemoteObject.narrow(obj, SampleHome.class);
But when running the Client , getting the error
java.lang.ClassCastException
at com.sun.corba.se.internal.javax.rmi.PoartableRemoteObject.narrow(Unknown Source)
at javax.rmi.PortableRemoteObject.narrow(Unknown Source) at SampleClient.main(SampleClient.java:27)
Is it a system error or whatHi sessionbean,
The most common cause of this exception is when the RMI-IIOP stubs are not found within the client's classpath. The client stubs are returned from the deployment step.
Also, it's better to use the no-arg initial context constructor "new InitialContext()" and let the J2EE 1.3 RI code bootstrap the correct naming service.
--ken
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