Small question on ejb's call back methods?

Hi I just don't want to use the declarative security where we configure roles, users and methods in deployment descriptors. I have written authorization code in a method and this method should be called before any business method is called to check authorization. Is this possible? if so how?
Edited by: murrayb9654 on Aug 27, 2010 12:00 PM

you'll want to look into interceptors. You can configure an interceptor to invoke on EVERY EJB call.
Check out this blog for example:
[http://www.adam-bien.com/roller/abien/entry/interceptors_ejb_3_for_absolute|http://www.adam-bien.com/roller/abien/entry/interceptors_ejb_3_for_absolute]
For the ejb-name, you can put * to indicate it should be invoked for all EJB calls, or you can put a more specific pattern.

Similar Messages

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,
Ulrich

Hi 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

Calling a method with a string

Here's the question:
I want to call a method with the name equal to a string variable.
For example, if the string variable contains "hellojava" , i'd like the hellojava() method to be called..
if the string contains "error", the error() method should be called..
and so on..:)

Here is an example I had thrown together for this
purpose of the exact demonstration, Ar'nt you in luck.:-). If there is anything you don't understand,
I can be reached at [email protected] and will be happy to help....
import java.lang.reflect.*;
import java.io.*;
class Test {
     String name = "Default";
        public Test(String name) {
                this.name = name;
        public void test() {
                System.out.println("Hello");
     public void count() {
          for(int i=0; i<10; i++) {
               System.out.println(i);
       public static void main(String[] args) {
             try {
                     Test myObject = new Test("test1");
                         Class myClass = myObject.getClass();
               BufferedReader bRead =
                    new BufferedReader(
                    new InputStreamReader( System.in ));
               String bufStr = null;
               while( (bufStr = bRead.readLine()) != "exit") {
                     Method noParams = myClass.getDeclaredMethod(bufStr, new Class[] {});
                          noParams.invoke(myObject, new Object[] {});
            }catch(Exception e) {
               System.out.println("No Such Method.");
}Good Luck,
-- Ian

How to call a method in private section of a class in the public section

Hi Everybody,
i have written a method(meth1) in the private section of a class(C1).
it is as follows
class C1 definition.
private section.
methods: meth1 importing im_dt1 like tp1
                                         im_dt2 like tp2
                                         im_dt3 like tp3
                                         im_dt4 like tp4
                           returning value(re_dt1) like tp5.
endclass.
i have the final data that has to be displayed in internal table re_dt1.
now my question is how to call this method present in private section into public section and display the data present in re_dt1.
Thanks,
learning.abap.

Hi,
what you need is one public method being called at start-of-selection. Within this the private methods have to be called.
The question is, why has the method for reading the database tables to be private? If you have only one private method reading all database tables the public method being called at start-of-selection will only consist of a call-method statement.
This seems to be one call to much.
The logic for reading the different database tables is hidden inside the class anyway.
Is there any further logic reading the different database tables?
Have always all table to be read? If not another approach would be one private method for each database table being called by a public method deciding which table has to be read:
public section.
methods get_data returning value(re_Dt1).
private section.
methods:
get_table_a returning value(im_dt1),
get_table_b returning value(im_dt2),
get_table_c returning value(im_dt3),
get_table_d returning value(im_dt4),
combine_data importing im_dt1
                                im_dt2
                                im_dt3
                                im_dt4
                        returning value(re_dt1).
*- implementation of public method:
method get_data.
data: lt_dt1 ...
           lt_dt2,
           lt_dt3,
           lt_dt4.
* here decide which tables have to be read:
lt_dt1 = get_table_a( ).
lt_dt2 = get_table_b( ).
lt_dt3 = get_table_c( ).
lt_dt4 = get_table_d( ).
re_dt1 = combine_data( i_dt1 = lt_dt1
                                       i_dt2 = lt_dt2
                                       i_dt3 = lt_dt3
                                       i_dt4 = lt_dt4 ).
endmethod.
*- implementation of private methods
method get_table_a.
endmethod.
method get_table_b.
endmethod.
method get_table_c.
endmethod.
method get_table_d.
endmethod.
method combine_data.
endmethod.
Regards
Dirk

Courtesy Call back - Internal Transfer Call

Hi All,
We have a small problem in deploying courtesy call back, it is working for the direct call coming from CVP, but we are trying to deploy the call is answered by agent and transfer to another skill group.
Any one come across this situtation please update us.
with Regards,
Manivannan

Gotcha ... it sort of looks like this:
/* GATHER CALLER ID */
CallbackNumber = Get Call Contact Info (--Triggering Contact--, Calling Number)
/* -CHECK CALLBACK NUMBER ISN'T NULL OR BLOCKED*/
If (CallbackNumber.length() == 0) Then
True
Goto Prompt for Callback Number ===========SEPARATE SECTION OF CODE
False
Goto Confirm Callback
/* CONFIRM CALLBACK NUMBER AND PROMPT CALLER WITH OPTIONS */
Confirm Callback:
promptCallbackNumber = Create Generated Prompt telephone.number (CallbackNumber)
promptCallbackConfirmCallerID = Create Container Prompt Concatenation (promptCallbackConfirmPrefix1 + promptCallbackNumber + promptCallbackConfirmSuffix)
Menu (--Triggering Contact--, promptCallbackConfirmCallerID)
Accept & Continue
/* NOW PREPEND ANY PSTN ACCESS CODE TO 10-DIGIT NUMBERS LEAVE INTERNAL 4-DIGIT NUMBERS AS IS. NO INTERNATIONAL CALLBACKS FOR NOW*/
If (CallbackNumber.length() == 10) Then
True
Set CallbackNumber = "91" + CallbackNumber
Goto Leave Callback Message
False
Goto Leave Callback Message
If you need more help just let me know. I can't share the whole script for now as It has quite a lot of development notes. But this should get you on the right track.

How to call a method in backing bean on hitting 'Enter' key on a page.

Hi all,
I would be obliged if any one can provide me solution for the below given problem.
My requirement is to call a method in backing bean when i hit 'Enter' key on a JSP page.
I am trying this by using a script given below.
*function fnChangeFocus(){*
*if(window.event.keyCode==13){*
* document.getElementById("mainform:submitForm:commandbutton").focus();*
The JSP has the textbox as given below.
*<h:inputText id="inputtxtboxid" disabled="false" value="#{Bean.inputvalue}"*
onkeypress="fnChangeFocus()" size="24" />
Using this I could not acheive the required functionality. Please suggest some alternative.
Thanks,
Jagadeesh Pala

Only a form element supports the submit() function. Make sure that the getElementById returns the appropriate form. Or rather pass the element as the 'this' reference to the function and get the parent form from it.
After all this is just basic DHTML / Javascript+DOM knowledge and in fact this has nothing to do with JSF. For future basic DHTML / JS+DOM questions you may take a look at the appropriate forums, e.g. dhtmlcentral.com, dynamicdrive.com, etcetera.

EJB 3.1 @Asynchronous and calling other methods from within

Hey all,
I am helping a friend set up a test framework, and I've turned him on to using JEE6 for the task. I am decently familiar with entity beans, session beans, and such. One of the new features is @Asynchronous, allowing a method to be ran on a separate thread. The test framework generally needs to spawn potentially 1000's of threads to simulate multiple users at once. Originally I was doing this using the Executor classes, but I've since learned that for some reason, spawning your own threads within a JEE container is "not allowed" or bad to do. I honestly don't quite know why this is.. from what I've read the main concern is that the container maintains threads and your own threads could mess up the container somehow. I can only guess that this might be possible if your threads use the container services in some way.. but if anyone could enlighten me on the details as to why this is bad, that would be great.
None the less, EJB 3.1 adds the async capability and I am now looking to use this. From my servlet I use @EJB to access the session bean, and call an async method. My servlet returns right away as it should. From the async method I do some work and using an entity bean store results, so I don't need to return a Future object. In fact, my ejb then makes an HttpClient call to another servlet to notify it that the result is ready.
My main question though, is if it's ok to call other methods from the async method that are not declared @Asynchronous. I presume it is ok, as the @Asynchronous just enables the container to spawn a thread to execute that method in. But I can't dig up any limitations on the code within an async method.. whether or not it has restrictions on the container services, is there anything wrong with using HttpClient to make a request from the method.. and making calls to helper methods within the bean that are not async.
Thanks.

851827 wrote:
Hey all,.. from what I've read the main concern is that the container maintains threads and your own threads could mess up the container somehow. I can only guess that this might be possible if your threads use the container services in some way.. but if anyone could enlighten me on the details as to why this is bad, that would be great.
Yes since the EE spec delegated thread management to conatiners, the container might assume that some info is available in the thread context that you may not have made available to your threads.
Also threading is a technical implementation detail and the drive with the EE spec is that you should concentrate on business requirements and let the container do the plumbing part.
If you were managing your own threads spawned from EJBs, you'd have to be managing your EJBs' lifecycle as well. This would just add to more plumbing code by the developer and typically requires writting platform specific routines which the containers already do anyway.
>
None the less, EJB 3.1 adds the async capability and I am now looking to use this. From my servlet I use @EJB to access the session bean, and call an async method. My servlet returns right away as it should. From the async method I do some work and using an entity bean store results, so I don't need to return a Future object. In fact, my ejb then makes an HttpClient call to another servlet to notify it that the result is ready.
My main question though, is if it's ok to call other methods from the async method that are not declared @Asynchronous. I presume it is ok, as the @Asynchronous just enables the container to spawn a thread to execute that method in. But I can't dig up any limitations on the code within an async method.. whether or not it has restrictions on the container services, is there anything wrong with using HttpClient to make a request from the method.. and making calls to helper methods within the bean that are not async.
Thanks.If you want to be asynchronous without caring about a return value then just use MDBs.
The async methods have no restrictions on container services and there is nothing wrong with calling other non async methods. Once the async method is reached those annotations don't matter anyway (unless if you call thhose methods from a new reference of the EJB that you look up) as they only make sense in a client context.
Why do you need to make the call to the servlet from the EJB? Makes it difficult to know who is the client here. Better use the Future objects and let the initial caller delegate to the other client components as needed.

How to call backing bean method from java script

Hi,
I would like to know how to call backing bean method from java script.
I am aware of serverListener and [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
but i am running in to some issues with [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
regarding which i asked for help in other thread with subject ....Question on AjaxAutoSuggest article (Ajax Transactions Using ADF and J...)
The reason why i posted is ( though i realise both are duplicates) .. that threads looks as a specific question to that article hence i would like to ask the quantified problem is asked in this thread.
So could any please letme know how to call backing bean method from java script
Thanks
Murali
Edited by: mchepuri on Oct 24, 2009 6:17 PM
Edited by: mchepuri on Oct 24, 2009 6:20 PM

Hello,
May know how to submit a button autoamtically on onload of page with clicking a welcome alert box. the submit button has managed button too to show a message on console using SOP.
the problem is.
1. before loading the page a javascript comes on which i clicked ok
2. the page gets loaded and the button is there which gets automatically clicked and the managed bean associated with prints a message on console using SOP.
I m trying to do this through server listener and click listener. the code is(adf jspx page)
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=UTF-8"/>
<f:view>
<af:document id="d1" binding="#{backingBeanScope.backing_check4.d1}">
<af:form id="f1" binding="#{backingBeanScope.backing_check4.f1}">
<af:commandButton text="commandButton 1"
binding="#{backingBeanScope.backing_check4.cb1}"
id="cb1" action="#{beanCheck4.submit1}"/>
<af:clientListener type="click" method="delRow"/>
<af:serverListener type= "jsServerListener"
method="#{backingBeanScope.backing_check4.submit1}"/>
<f:facet name="metaContainer">
<af:resource type ="javascript">
x=confirm("hi");
// if(x){
delRow = function(event){
AdfCustomEvent.queue(event.getSource(), "jsServerListener", {}, false);
return true;
</af:resource>
</f:facet>
</af:form>
</af:document>
</f:view>

</jsp:root>
the backing bean code is -----
public class classCheck4 {
public classCheck4() {
public String submit1() {
System.out.println("hello");
return null;
}

Error while calling a method on Bean (EJB 3.0)

I am getting an error while calling a method on EJB. I am using EJB3.0 and my bean is getting properly deployed(i am sure b'cos i can see the successfullly deployed message). Can any body help me
Error is -->
Error while destroying resource :An I/O error has occured while flushing the output - Exception: java.io.IOException: An established connection was aborted by the software in your host machine
Stack Trace:
java.io.IOException: An established connection was aborted by the software in your host machine
at sun.nio.ch.SocketDispatcher.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:33)
at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
at sun.nio.ch.IOUtil.write(IOUtil.java:75)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:302)
at com.sun.enterprise.server.ss.provider.ASOutputStream.write(ASOutputStream.java:138)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at org.postgresql.PG_Stream.flush(PG_Stream.java:352)
at org.postgresql.core.QueryExecutor.sendQuery(QueryExecutor.java:159)
at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:70)
at org.postgresql.jdbc1.AbstractJdbc1Connection.ExecSQL(AbstractJdbc1Connection.java:482)
at org.postgresql.jdbc1.AbstractJdbc1Connection.ExecSQL(AbstractJdbc1Connection.java:461)
at org.postgresql.jdbc1.AbstractJdbc1Connection.rollback(AbstractJdbc1Connection.java:1031)
at org.postgresql.jdbc2.optional.PooledConnectionImpl$ConnectionHandler.invoke(PooledConnectionImpl.java:223)
at $Proxy34.close(Unknown Source)
at com.sun.gjc.spi.ManagedConnection.destroy(ManagedConnection.java:274)
at com.sun.enterprise.resource.LocalTxConnectorAllocator.destroyResource(LocalTxConnectorAllocator.java:103)
at com.sun.enterprise.resource.AbstractResourcePool.destroyResource(AbstractResourcePool.java:603)
at com.sun.enterprise.resource.AbstractResourcePool.resourceErrorOccurred(AbstractResourcePool.java:713)
at com.sun.enterprise.resource.PoolManagerImpl.putbackResourceToPool(PoolManagerImpl.java:424)
at com.sun.enterprise.resource.PoolManagerImpl.resourceClosed(PoolManagerImpl.java:393)
at com.sun.enterprise.resource.LocalTxConnectionEventListener.connectionClosed(LocalTxConnectionEventListener.java:69)
at com.sun.gjc.spi.ManagedConnection.connectionClosed(ManagedConnection.java:618)
at com.sun.gjc.spi.ConnectionHolder.close(ConnectionHolder.java:163)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.closeDatasourceConnection(DatabaseAccessor.java:379)
at oracle.toplink.essentials.internal.databaseaccess.DatasourceAccessor.closeConnection(DatasourceAccessor.java:367)
at oracle.toplink.essentials.internal.databaseaccess.DatabaseAccessor.closeConnection(DatabaseAccessor.java:402)
at oracle.toplink.essentials.internal.databaseaccess.DatasourceAccessor.afterJTSTransaction(DatasourceAccessor.java:100)
at oracle.toplink.essentials.threetier.ClientSession.afterTransaction(ClientSession.java:104)
at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.afterTransaction(UnitOfWorkImpl.java:1816)
at oracle.toplink.essentials.transaction.AbstractSynchronizationListener.afterCompletion(AbstractSynchronizationListener.java:161)
at oracle.toplink.essentials.transaction.JTASynchronizationListener.afterCompletion(JTASynchronizationListener.java:87)
at com.sun.ejb.containers.ContainerSynchronization.afterCompletion(ContainerSynchronization.java:174)
at com.sun.enterprise.distributedtx.J2EETransaction.commit(J2EETransaction.java:467)
at com.sun.enterprise.distributedtx.J2EETransactionManagerOpt.commit(J2EETransactionManagerOpt.java:357)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3653)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3431)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1247)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:197)
at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:110)
at $Proxy84.addDepartment(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:121)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:650)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:193)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1705)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1565)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:947)
at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:178)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:717)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:473)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1270)
at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:479)
End of Stack Trace
|#]
RAR5035:Unexpected exception while destroying resource. To get exception stack, please change log level to FINE.
EJB5018: An exception was thrown during an ejb invocation on [DepartmentSessionBean]
javax.ejb.EJBException: Unable to complete container-managed transaction.; nested exception is: javax.transaction.SystemException
javax.transaction.SystemException
at com.sun.enterprise.distributedtx.J2EETransaction.commit(J2EETransaction.java:452)
at com.sun.enterprise.distributedtx.J2EETransactionManagerOpt.commit(J2EETransactionManagerOpt.java:357)
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:3653)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:3431)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1247)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:197)
at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:110)
at $Proxy84.addDepartment(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Means theres an error in XML/ABAP conversion probably due a syntax error...
Regards
Juan

Calling a method on backing bean in response to contextual event

Hi
I am using Jdeveloper 11.1.1.6.0 and using ADF contextual events..
I have a drop down list and i am rasiing a contextual event on changing the current selection. In response to that event i want to call a backing bean method with parameters.. But when i click on the subscriber section for the contextual event, i can see only some bindings of the page.. How can i call a method on backing bean as a subscriber..
Thanks
Raghu

Hi,
this article has a use case for the POJO approach: http://www.oracle.com/technetwork/issue-archive/2011/11-may/o31adf-352561.html
Another is to define a method binding in the receiving PageDef file and configure it as explained here
http://java.net/projects/smuenchadf/pages/ADFSamplesBindings/revisions/3#SMU164
Frank

Problem calling a method in a servlet witch returns remote ejb

Hi, I have a problem combining servlets ands ejbs, I expose my problem :
What I have :
1 . I have a User table into a SGBD with two attributes login and pass.
2 . I have a UserBean linked to User table with a remote interface
3 . I have a stateless UserSessionBean with a remote interface
4 . I have a UserServlet linked to a jsp page which allows me to add users
5 . I use Jboss
What is working ?
1 - I have a method newUser implemented in my UserSessionBean :
public class UserSessionBean implements SessionBean {
private SessionContext sessionContext;
private UserRemoteHome userRemoteHome;
public void ejbCreate() throws CreateException {
// Initialize UserRemoteHome
// Method to add a new user
public UserRemote newUser(String login, String password) {
        UserRemote newUser = null;
        try {
            newUser = userRemoteHome.create(login, password);
        } catch (RemoteException ex) {
            System.err.println("Error: " + ex);
        } catch (CreateException ex) {
            System.err.println("Error: " + ex);
        return newUser;
}2 - When I test this method with a simple client it works perfectly :
public class TestEJB {
    public static void main(String[] args) {
        Context initialCtx;
        try {
            // Create JNDI context
            // Context initialization
            // Narrow UserSessionHome
            // Create UserSession
            UserSession session = sessionHome.create();
            // Test create
            UserRemote newUser = session.newUser("pierre", "hemici");
            if (newUser != null) {
                System.out.println(newUser.printMe());
        } catch (Exception e) {
            System.err.println("Error: " + e);
            e.printStackTrace();
Result : I got the newUser printed on STDOUT and I check in the User table (in the SGBD) if the new user has been created.
What I want ?
I want to call the newUser method from the UserServlet and use the RemoteUser returned by the method.
What I do ?
The jsp :
1 - I have a jsp page where a get information about the new user to create
2 - I put the login parameter and the password parameter into the request
3 - I call the UserServlet when the button "add" is pressed on the jsp page.
The Servlet :
1 - I have a method doInsert which call the newUser method :
public class UserServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html";
    // EJB Context
    InitialContext ejbCtx;
    // Session bean
    UserSession userSession;
    public void init() throws ServletException {
        try {
            // Open JNDI context (the same as TestClient context)
            // Get UserSession Home
            // Create UserSession
            userSession = userSessionHome.create();
        } catch (NamingException ex) {
            System.out.println("Error: " + ex);
        } catch (RemoteException ex) {
            System.out.println("Error: " + ex);
        } catch (CreateException ex) {
            System.out.println("Error: " + ex);
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws
            ServletException, IOException {
     * Does insertion of the new user in the database.
    public void doInsert(HttpServletRequest req, HttpServletResponse resp) throws
            ServletException, IOException {
        try {
            // Get parameters to create the newUser
            String login = req.getParameter("login");
            String password = req.getParameter("password");
           // Create the newUser
            System.out.println("Calling newUser before");
            UserRemote user = userSession.newUser(login, password);
            System.out.println("Calling newUser after");
        } catch (Exception e) {
    // Clean up resources
    public void destroy() {
Result :
When I run my jsp page and click on the "add" button, I got the message "Calling newUser before" printed in STDOUT and the error message :
ERROR [[userservlet]] Servlet.service() for servlet userservlet threw exception
javax.servlet.ServletException: loader constraints violated when linking javax/ejb/Handle class
     at noumea.user.UserServlet.service(UserServlet.java:112)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     at java.lang.Thread.run(Thread.java:534)
Constat :
I checked into my SGBD and the new user has been created.
The error appears only when the method return Remote ejbs, if I return simples objects (Strings, int..) it works.
What can I do to resolve this problem ?
Thank you.

"Why do you want to servlet to gain access to another EJB through the stateless session bean. Why cant the servlet call it directly ?"
Because I want to access to the informations included in the entity bean UserBean (which is remote).
You said that it is a bad design, but how can I access to my UserBean ejbs from the session bean if I don't do that ?
For example I want a List of all users to be seen in a jsp page :
1 - I call the method getUserList which returnsan ArrayList of UserRemote.
2 - I iterate over the ArrayList to get the users parameters to be seen.
As the other example (newUser), when I do
ArrayList users = (ArrayList) userSession.getUserList(); with the simple client it works, but in the servlet I got the same error.
But, if I call directly the findAll method (as you'are saying) in the servlet
ArrayList users = (ArrayList) userRemoteHome.findAll(); it works...
I think that if my servlet calls directly entity ejbs, I don't need UserSession bean anymore. Is that right ?
I precise that my design is this :
jsp -> servlet -> session bean -> entity bean -> sgbd
Is that a bad design ? Do I need the session bean anymore ?
Thank you.

Browser Dependency when calling a method in backing bean using a javasript.

Hi all,
I have a problem which may look simple but bugging me for quite some time.
The problem is : When I call a method in the backing bean using a Javascript, (the method can alternatively be invoked by clicking on a command link) I am facing an exception (stack printed below).
The strange part is that...I am getting this exception only when I use Internet Explorer. It works absolutely fine when I use Mozilla or Netscape browsers. Also, even in ie, it is working fine when I click on the link directly. The probem comes only when I invoke the action using a javascript.
WARN [lifecycle] executePhase(RENDER_RESPONSE 6,com.sun.faces.cont
ext.FacesContextImpl@16ce9df) threw exception
javax.faces.FacesException
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java
:135)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:290)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.ja
va:96)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:206)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:230)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:175)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssoci
ationValve.java:179)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:
84)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104
     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnecti
onValve.java:156)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http
11Protocol.java:580)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     at java.lang.Thread.run(Unknown Source)
Caused by: ClientAbortException: java.net.SocketException: Connection reset by
peer: socket write error
     at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:
358)
     at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:434)
     at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:309)
     at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
     at org.apache.catalina.connector.Response.flushBuffer(Response.java:542)
     at org.apache.catalina.connector.ResponseFacade.flushBuffer(ResponseFacade.java
:279)
     at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:20
2)
     at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java
:101)
     at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:
222)
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java
:106)
     ... 24 more
Caused by: java.net.SocketException: Connection reset by peer: socket write erro
r
     at java.net.SocketOutputStream.socketWrite0(Native Method)
     at java.net.SocketOutputStream.socketWrite(Unknown Source)
     at java.net.SocketOutputStream.write(Unknown Source)
     at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWri
te(InternalOutputBuffer.java:764)
     at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFi
lter.java:124)
     at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.j
ava:570)
     at org.apache.coyote.Response.doWrite(Response.java:560)
     at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:
353)
     ... 33 more
13:54:42,805 ERROR [STDERR] ClientAbortException: java.net.SocketException: Con
nection reset by peer: socket write error
13:54:42,805 ERROR [STDERR]      at org.apache.catalina.connector.OutputBuffer.realW
riteBytes(OutputBuffer.java:358)
13:54:42,805 ERROR [STDERR]      at org.apache.tomcat.util.buf.ByteChunk.flushBuffer
(ByteChunk.java:434)
13:54:42,805 ERROR [STDERR]      at org.apache.catalina.connector.OutputBuffer.doFlu
sh(OutputBuffer.java:309)
13:54:42,805 ERROR [STDERR]      at org.apache.catalina.connector.OutputBuffer.flush
(OutputBuffer.java:288)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.connector.Response.flushBuff
er(Response.java:542)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.connector.ResponseFacade.flu
shBuffer(ResponseFacade.java:279)
13:54:42,820 ERROR [STDERR]      at com.sun.faces.application.ViewHandlerImpl.render
View(ViewHandlerImpl.java:202)
13:54:42,820 ERROR [STDERR]      at org.ajax4jsf.framework.ViewHandlerWrapper.render
View(ViewHandlerWrapper.java:101)
13:54:42,820 ERROR [STDERR]      at org.ajax4jsf.framework.ajax.AjaxViewHandler.rend
erView(AjaxViewHandler.java:222)
13:54:42,820 ERROR [STDERR]      at com.sun.faces.lifecycle.RenderResponsePhase.exec
ute(RenderResponsePhase.java:106)
13:54:42,820 ERROR [STDERR]      at com.sun.faces.lifecycle.LifecycleImpl.phase(Life
cycleImpl.java:251)
13:54:42,820 ERROR [STDERR]      at com.sun.faces.lifecycle.LifecycleImpl.render(Lif
ecycleImpl.java:144)
13:54:42,820 ERROR [STDERR]      at javax.faces.webapp.FacesServlet.service(FacesSer
vlet.java:245)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
internalDoFilter(ApplicationFilterChain.java:290)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
doFilter(ApplicationFilterChain.java:206)
13:54:42,820 ERROR [STDERR]      at com.hds.vc.common.infrastructure.AIMFilter.doFil
ter(AIMFilter.java:27)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
internalDoFilter(ApplicationFilterChain.java:235)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
doFilter(ApplicationFilterChain.java:206)
13:54:42,820 ERROR [STDERR]      at org.jboss.web.tomcat.filters.ReplyHeaderFilter.d
oFilter(ReplyHeaderFilter.java:96)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
internalDoFilter(ApplicationFilterChain.java:235)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.ApplicationFilterChain.
doFilter(ApplicationFilterChain.java:206)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.StandardWrapperValve.in
voke(StandardWrapperValve.java:230)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.StandardContextValve.in
voke(StandardContextValve.java:175)
13:54:42,820 ERROR [STDERR]      at org.jboss.web.tomcat.security.SecurityAssociatio
nValve.invoke(SecurityAssociationValve.java:179)
13:54:42,820 ERROR [STDERR]      at org.jboss.web.tomcat.security.JaccContextValve.i
nvoke(JaccContextValve.java:84)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.StandardHostValve.invok
e(StandardHostValve.java:128)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.valves.ErrorReportValve.invo
ke(ErrorReportValve.java:104)
13:54:42,820 ERROR [STDERR]      at org.jboss.web.tomcat.service.jca.CachedConnectio
nValve.invoke(CachedConnectionValve.java:156)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.core.StandardEngineValve.inv
oke(StandardEngineValve.java:109)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.connector.CoyoteAdapter.serv
ice(CoyoteAdapter.java:241)
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.http11.Http11Processor.process
(Http11Processor.java:844)
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.http11.Http11Protocol$Http11Co
nnectionHandler.process(Http11Protocol.java:580)
13:54:42,820 ERROR [STDERR]      at org.apache.tomcat.util.net.JIoEndpoint$Worker.ru
n(JIoEndpoint.java:447)
13:54:42,820 ERROR [STDERR]      at java.lang.Thread.run(Unknown Source)
13:54:42,820 ERROR [STDERR] Caused by: java.net.SocketException: Connection rese
t by peer: socket write error
13:54:42,820 ERROR [STDERR]      at java.net.SocketOutputStream.socketWrite0(Native
Method)
13:54:42,820 ERROR [STDERR]      at java.net.SocketOutputStream.socketWrite(Unknown
Source)
13:54:42,820 ERROR [STDERR]      at java.net.SocketOutputStream.write(Unknown Source
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.http11.InternalOutputBuffer$Ou
tputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:764)
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.http11.filters.ChunkedOutputFi
lter.doWrite(ChunkedOutputFilter.java:124)
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.http11.InternalOutputBuffer.do
Write(InternalOutputBuffer.java:570)
13:54:42,820 ERROR [STDERR]      at org.apache.coyote.Response.doWrite(Response.java
:560)
13:54:42,820 ERROR [STDERR]      at org.apache.catalina.connector.OutputBuffer.realW
riteBytes(OutputBuffer.java:353)
13:54:42,820 ERROR [STDERR]      ... 33 more
Please throw some light on this issue.

This is the Java script I am using
function submitForm(e){
     var characterCode
     if(e && e.which){
     e = e
     characterCode = e.which
     }else{
     e = event                    characterCode = e.keyCode
     if (characterCode== 13){
     document.getElementById('mainform:submitForm:search').onclick();
Regards,
Jagadeesh
Edited by: Jagadeesh.Pala on Oct 1, 2007 3:59 AM

Calling a method in the backing bean when rendering a table

I'm rendering a table that begins with :
<h:dataTable value="#{showRooms.rooms}" var="rowRoom" ...
There are several properties I'm displaying. Some are just displayed as they appear from the database like:
<h:outputText value="#{rowRoom.roomNumber}"/>
However, some I need to translate so they display a more meaningful message to the users. For example, status is stored 'A', or 'NA', but this should display 'Available' or 'Not Available'. To do this, I'm taking an idea I saw in another forum by providing a method to call and translate the text. For example:
public String getDisplayedStatus(String status) {
if (status.equals("A") {
return "Available";
} else {
My problem is how can I invoke a method and pass in the current value of status for that row in the table. I think I need something like this:
<h:outputText value="#{showRooms.getDisplayedStatus(#{rowRoom.roomStatus})"/>
But that doesn't work. I can invoke the getDisplayedStatus method when passing in a hardcoded parameter, but it won't translate the value of both expressions(the method and the method param). How can I achieve this?
Thanks,
Mike

Yes. I've done that and it does work....sort of. It works as long as I refer to it as 'displayStatus'. It looks up the getDisplayStatus and returns a value. The problem is getting the current status value from the object in the List. For example, the 3rd row in the table has either 'A;' or 'NA' for status. I need to know this value in order to do my translation. The way I see it, I either need
1.)a way to call a method on the backing bean and pass the value of status from the current row into the method.
-or-
2.)in getDisplayStatus, I need a way to access the current row's value, perhaps through an expression. This appears to be what you can do in the AbstractPageBean class that all backing beans inherit in Studio Creator. I've seen code in a getter like 'getValue(#{currentRow.status}'), but I don't know how that is done. I looked for the source to AbstractPageBean on the web but couldn't find it - maybe its not open-source.
Anyway, please share if anyone has a solution. I'm sure this has been done before.
Thanks,
Mike

Calling back c++ method in an exe (not a dll) from java?

Hi all,
I have to make an hybrid C++/java from an existing C++
application that compiled is a big single exe not a dll.
I'm running under win32.
The application consists of several windows. The hybrid
will have widows in C++ and some in java. They have the
same menu and tool bar. In the C++, there are some
callbacks called when a button is pressed. How to call
these callback from java given the fact that the JVM and
the java classes are launched by the exe file.
I know how, from C++, start JVM and call my java window.
I also know how to call a C++ method that is in a dll from
java. It's from the tutorial
http://java.sun.com/docs/books/tutorial/native1.1/index.html
But I don't know how to call a C++ method that is in in an
exe which has launch a JVM from an object running in this
JVM.
Is there somewhere an example like this?
Thanks,
Xavier.

Thanks this helped.
For those who want a complete example, here it is:
Tested on XP, java 1.4.2, VC++ 6.0.
************ File invoke.cpp *****************************
#include <stdlib.h>
#include <jni.h>
#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else /* UNIX */
#define PATH_SEPARATOR ':'
#endif
#define USER_CLASSPATH "." /* where Prog.class is */
void JNICALL displayHelloWorld(JNIEnv *env, jobject obj)
    printf("Hello world: made by printf from C++\n");
    return;
void main() {
    JNIEnv *env;
    JavaVM *jvm;
    JavaVMInitArgs vm_args;
    jint res;
    jclass cls;
    jmethodID mid;
    jstring jstr;
    jobjectArray args;
    char classpath[1024];
     int result;
    /* IMPORTANT: specify vm_args version # if you use JDK1.1.2 and beyond */
     JavaVMOption options[3];
     options[0].optionString = "-verbose:gc";
     sprintf (classpath, "-Djava.class.path=%s", USER_CLASSPATH);
     options[1].optionString = classpath;
     options[2].optionString = "-Djava.compiler=NONE";
     vm_args.options = options;
     vm_args.nOptions = 3;
     vm_args.ignoreUnrecognized = JNI_TRUE;
        vm_args.version = JNI_VERSION_1_4;
     /* IMPORTANT: Note that in the Java 2 SDK, there is no longer any need to call
      * JNI_GetDefaultJavaVMInitArgs. It causes a bug
    /* Append USER_CLASSPATH to the end of default system class path */
    /* Create the Java VM */
    res = JNI_CreateJavaVM(&jvm,(void**)&env, &vm_args);
    if (res < 0) {
        fprintf(stderr, "Can't create Java VM\n");
        exit(1);
    cls = env->FindClass("mypackage/Prog");
    if (cls == 0) {
        fprintf(stderr, "Can't find mypackage/Prog class\n");
        exit(1);
   JNINativeMethod nm;
   nm.name = "displayHelloWorld";
   /* method descriptor assigned to signature field */
   nm.signature = "()V";
   nm.fnPtr = displayHelloWorld;
   env->RegisterNatives(cls, &nm, 1);
    mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
    if (mid == 0) {
        fprintf(stderr, "Can't find Prog.main\n");
        exit(1);
    jstr = env->NewStringUTF(" from C++! calleded by C++, using argument from C++ but java method");
    if (jstr == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    args = env->NewObjectArray(1,
                        env->FindClass("java/lang/String"), jstr);
    if (args == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    env->CallStaticVoidMethod(cls, mid, args);
    jvm->DestroyJavaVM();
}********************* File ./mypackage/Prog.java **************************
package mypackage;
public class Prog {
       public native void displayHelloWorld();
    public static void main(String[] args) {
        System.out.println("Hello World" + args[0] +"\n");
        Prog prog = new Prog();
        prog.displayHelloWorld();
        System.out.println("(called from java)");
        System.out.println("\nSo to sumurize:");
        System.out.println(" -1 Starting point is an exe (not DLL, there is no DLL) so C++ code");
        System.out.println(" -2 From C++ call java method using argument from C++");
        System.out.println(" -3 From java, that was launched by the exe, call to");
        System.out.println("    a native using the RegisterNatives in C++\n");
        System.out.println("You got a bidirectional example with as starting point");
        System.out.println("a single exe, launching JVM, loading class call back C++!");
}******************* Command line for all ****************************************
javac mypackage/Prog
cl -I"D:\Program Files\j2sdk1.4.2_03\include" -I"D:\Program Files\j2sdk1.4.2_03\include\win32" -MT
invoke.cpp -link D:\PROGRA~1\j2sdk1.4.2_03\lib\jvm.lib
(Remark, the last path is using the short name for "Program Files" because with the blank
even adding double quotes result into an error)
You must have jvm.dll in your path for me it's Path=D:\Program Files\j2sdk1.4.2_03\jre\bin\client;
Then simply call invoke and see the result. :-)

Call the method of a ejb??

hi!
I get EJB refrence ,How can I call the method of it?(I use the stand-alone application client)
code:
import javax.naming.*;
//import javax.naming.InitialContext;
import javax.rmi.*;
import java.util.*;
//import hello.*;
public class jndi {
public static void main(String[] args) {
try {
Hashtable env = new Hashtable();
     env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL, "iiop://localhost:3000");
     Context initctx = new InitialContext(env);
     Object objref = initctx.lookup("HelloEJB");
the method I want to call
} catch (Exception ex) {
System.err.println("Caught an unexpected exception!");
ex.printStackTrace();
Because it is the stand-alone .I can not to convert the objref:
HelloHome helloHome =(HelloHome)objref;
what can I do???

It still can work.
Tere is a ClassCastException.
And the the class name of the objref is "com.sun.corba.se.internal.iiop.CDRInputStream_1_0$1".
but my EJB is named HelloEJB.
Is the object which I want to call????

Small question on ejb's call back methods?

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