Reference EJB from servlet's action/helper classes

Hello
How to make a reference to stateless session bean from one of the helper classes of a servlet WITHOUT using any of these:
* dependency injection (like @EJB) - I think this is not supported in this kind of class, EJB references can be injected only to servlets themselves or some other things (but not objects of classes "accompanying" a servlet)
* home or local home interfaces (I would like to avoid writing them)
* using mappedName (either in @Stateless or in ejb-jar) - since meaning of this is application-server dependent and thus not portable.
By a "class accompanying a servlet" / "helper class" I mean utility or action classes, like MyActionClass, which would be instantiated and then used by a aforementioned servlet.
Thanks.

The EJB dependency must be looked up via the java:comp/env namespace since as you point out
Java EE 5 environment annotations are not supported on POJOs. However, the dependency itself
can either be defined using @EJB on some other managed class in the .war or within the
web.xml. We have an entry in our EJB FAQ that has the details :
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html#POJOLocalEJB
Also, whenever the client component resides in the same application as the target EJB (which is
required for Local access but not for Remote access) there is no need to use mappedName to
resolve the EJB dependency. It is either automatically resolved if the business interface type of
the EJB dependency is only exposed by a single EJB in the application, OR the beanName()
/ ejb-link attributes can be used to unambiguously identify the target EJB using ejb-name.
You can find more about this in the FAQ as well.

Similar Messages

Access EJB from Servlet that in different archive?

package kyro.ejb.session;
import javax.ejb.*;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless(name="StandAlone")
@Remote(StandAlone.class)
public class StandAloneBean
implements StandAlone, StandAloneLocal
public StandAloneBean() {
public String sayHello() {
return "sayHello";
I want to access ejb from servlet that .war and .jar not in single .ear. I want to try that just with annotation not xml descriptor cause is easy to understand for me. I use Glassfish. But i can't lookup that ejb. How can i lookup that ejb with jndi? Can't you give me example of servlet to access that? I not use JNDI.properties, are that caused i can't access my ejb? I just thing .war and.jar in one server, are i have to used JNDI.properties. can you explain how to use JNDI.properties in servlet or separate file?


But i can't lookup that ejb. How are you trying and what exception is occurring?
How can i lookup that ejb with jndi? [https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html|https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html]
m

How to send a String value from Servlet to Action class in Struts .

when iam trying to send string value from Servlet to Struts Action class through Http Session, iam getting null value, iam really in big confusion, help me.

please elaborate clearly or put you code of both action and servlet here
Are both of them in same web application

Connecting to Remote EJB from Servlet in same application

Please help!
I was able to connect to SessionBeans and EJB from my sample java client in OCJ4 but when I try to do same thing from my web application using servlets, I get the below NullPointerException error.
The JNDI lookup works fine using java client but difficult from a servlet.
I am sure there is something I am missing.
Thanks
This is what I do in the servlet:
public void init() throws ServletException, NamingException, CreateException, RemoteException
Context jndiContext = getInitialContext();
SessionCartEJBHome home = (SessionCartEJBHome)jndiContext.lookup("SessionCartEJBBean");
sessionEJB = null;
try{
sessionEJB = (SessionCartEJB) home.create();
}catch (Exception e)
e.printStackTrace();
private static Context getInitialContext() throws NamingException
Hashtable env = new Hashtable();
// Standalone OC4J connection details
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "admin");
env.put(Context.PROVIDER_URL, "ormi://Princeton/ejb1");
return new InitialContext(env);
And when I call the following procedure, it blow up at the line sessionEJB.getLineItem(new Long(1304));
sessionEJB is a class variable.
void processCatalogPage(HttpServletRequest request,
HttpServletResponse response,
ActionMapping mapping,
HttpSession session
throws ServletException, IOException , Exception, FinderException{
try {
ActionForward actFor = null;
String itemId = request.getParameter("id");
if ( itemId != null ) {
String[] itemIds = new String[1];
itemIds[0] = itemId;
sessionEJB.getLineItem(new Long(1304));
actFor = mapping.findForward("catalog");
return (mapping.findForward("success"));
} catch (Exception ex)
ex.printStackTrace();
System.err.println(ex.toString());
throw new EJBException(ex.toString());
04/12/11 23:45:24 java.lang.NullPointerException
04/12/11 23:45:24 at com.alashoofi.Cart.processCatalogPage(Cart.java:187)
04/12/11 23:45:24 at com.alashoofi.Cart.execute(Cart.java:86)
04/12/11 23:45:24 at org.apache.struts.action.RequestProcessor.processActi
onPerform(RequestProcessor.java:484)
04/12/11 23:45:24 at org.apache.struts.action.RequestProcessor.process(Req
uestProcessor.java:274)
04/12/11 23:45:24 at org.apache.struts.action.ActionServlet.process(Action
Servlet.java:1482)
04/12/11 23:45:24 at org.apache.struts.action.ActionServlet.doGet(ActionSe
rvlet.java:507)
04/12/11 23:45:24 at javax.servlet.http.HttpServlet.service(HttpServlet.ja
va:740)
04/12/11 23:45:24 at javax.servlet.http.HttpServlet.service(HttpServlet.ja
va:853)
04/12/11 23:45:24 at com.evermind.server.http.ServletRequestDispatcher.inv
oke(ServletRequestDispatcher.java:765)
04/12/11 23:45:24 at com.evermind.server.http.ServletRequestDispatcher.for
wardInternal(ServletRequestDispatcher.java:317)
04/12/11 23:45:24 at com.evermind.server.http.HttpRequestHandler.processRe
quest(HttpRequestHandler.java:790)
04/12/11 23:45:24 at com.evermind.server.http.HttpRequestHandler.run(HttpR
equestHandler.java:270)
04/12/11 23:45:24 at com.evermind.server.http.HttpRequestHandler.run(HttpR
equestHandler.java:112)
04/12/11 23:45:24 at com.evermind.util.ReleasableResourcePooledExecutor$My
Worker.run(ReleasableResourcePooledExecutor.java:192)
04/12/11 23:45:24 at java.lang.Thread.run(Thread.java:534)
04/12/11 23:45:24 java.lang.NullPointerException
Dec 11, 2004 11:45:24 PM org.apache.struts.action.RequestProcessor processExcept
ion
WARNING: Unhandled Exception thrown: class javax.ejb.EJBException

Avi,
Thanks for your response. I am actually returning a new InitialContext in a function call in the servlet. What I have noticed though is that JDeveloper creates two ear files for the application. One for the ejbs called ejb1.ear and another for the web files webapp1.ear. These are located in the applications subdirectory in OC4J directory.
I know I have two projects in the application, model and viewController. I am just trying to follow the MVC pattern.
In short, I don't think the web and the ejbs are in same ear file. I made the web project depend on the ejbs though. There is an option to set such. I don't know how to tell JDeveloper to put them all in one ear file.
I will appreciate any suggestion.
Thanks
Matilda

Class/member variables usage in servlets and/or helper classes

I just started on a new dev team and I saw in some of their code where the HttpSession is stored as a class/member variable of a servlet helper class, and I was not sure if this was ok to do or not? Will there be problems when multiple users are accessing the same code?
To give some more detail, we are using WebLogic and using their Controller (.jpf) files as our servlet/action. Several helper files were created for the Controller file. In the Controller, the helper file (MyHelper.java) is instantiated, and then has a method invoked on it. One of the parameters to the method of the helper class is the HttpServletRequest object. In the method of the helper file, the very first line gets the session from the request object and assigns it to a class variable. Is this ok? If so, would it be better to pass in the instance of the HttpServletRequest object as a parameter to the constructor, which would set the class variable, or does it even matter? The class variable holding the session is used in several other methods, which are all invoked from the method that was invoked from the Controller.
In the Controller file:
MyHelper help = new MyHelper();
help.doIt(request);MyHelper.java
public class MyHelper {
    private HttpSession session;
    public void doIt(HttpServletRequest request) {
        session = request.getSession();
        String temp = test();
    private String test() {
        String s = session.getAttribute("test");
        return s;
}In the past when I have coded servlets, I just passed the request and/or session around to the other methods or classes that may have needed it. However, maybe I did not need to do that. I want to know if what is being done above will have any issues with the data getting "crossed" between users or anything of that sort.
If anyone has any thoughts/comments/ideas about this I would greatly appreciate it.

No thoughts from anyone?

Calling ejbs from servlets without using web apps.

i am trying to instantiate and ejb from a servlet but it gives me the
 following error. the configuration and code that generated this error is
 attached below.
 oddly enough the same chunk of code works fine in a stand alone client if
 j2ee.jar;weblogic\classes and weblogicaux.jar are included in the classpath.
 any help would be appreciated.
 peter
 -8787844: in servlet.Webmedx.init
 -8787844: null
 java.lang.ClassCastException
 at
 com.sun.corba.ee.internal.javax.rmi.PortableRemoteObject.narrow(Porta
 bleRemoteObject.java:296)
 at
 javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
 at webmedx.servlet.Webmedx.init(Webmedx.java:23)
 at javax.servlet.GenericServlet.init(GenericServlet.java:258)
 at
 weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubIm
 pl.java:474)
 at
 weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStub
 Impl.java, Compiled Code)
 at
 weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubI
 mpl.java:422)
 at
 weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.
 java:187)
 at
 weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
 pl.java:118)
 at
 weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
 textImpl.java:760)
 at
 weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
 textImpl.java:707)
 at
 weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
 ContextManager.java:251)
 at
 weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
 a:369)
 at
 weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:269)
 at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
 Code)
 configuration:
 WebLogic startup settings are presently:
 CLASSPATH Prefix
 \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar
 CLASSPATH
 \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar;\weblo
 gic\
 jre1_2\lib\tools.jar;\weblogic\jre1_2\jre\lib\rt.jar;\weblogic\jre1_2\jre\li
 b\i1
 8n.jar;C:\weblogic\license;C:\weblogic\classes\boot;C:\weblogic\classes;C:\w
 eblo
 gic\lib\weblogicaux.jar;C:\weblogic\eval\cloudscape\lib\cloudscape.jar
 JAVA_HOME \weblogic\jre1_2
 WEBLOGIC_LICENSEDIR C:\weblogic\license
 WEBLOGIC_HOME C:\weblogic
 system properties:
 java.security.manager
 java.security.policy=\weblogic\weblogic.policy
 weblogic.system.home=\weblogic
 java.compiler=symcjit
 weblogic.class.path=\weblogic\lib\weblogic510sp5.jar;\weblog
 ic\license;\weblogic\classes;\weblogic\lib\weblogicaux.jar
 INITIAL_HEAP 64 MB
 MAX_HEAP 64 MB
 SERVERCLASSPATH
 \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar;\weblo
 gic\
 jre1_2\jre\lib\rt.jar;\weblogic\jre1_2\jre\lib\i18n.jar;C:\weblogic\classes\
 boot
 ;C:\weblogic\eval\cloudscape\lib\cloudscape.jar
 Type "wlconfig -help" for program usage.
 code:
 public void init() throws ServletException{
 try{
 Log.debug("in servlet.Webmedx.init");
 Properties h = new Properties();
 h.put(Context.INITIAL_CONTEXT_FACTORY,
 "weblogic.jndi.WLInitialContextFactory");
 h.put(Context.PROVIDER_URL, "t3://localhost:7001");
 Context initial = new InitialContext(h);
 Object objref = initial.lookup("webmedx/pool");
 webmedxpoolhome =
 (WebmedxPoolHome)PortableRemoteObject.narrow(objref,WebmedxPoolHome.class);
 }catch(Exception ex){
 Log.error(ex);


The problem before was that you were trying to load the same class from
 2 different class paths. The ClassCastException is very un-intuitive in this
 case.
 Peter Ghosh wrote:
 > however, when i added it to the classpath prefix (not the
 > weblogic.classpath) it seemed to do the trick. very odd.
 > thanks,
 > peter
 >
 > "Peter Ghosh" <[email protected]> wrote in message
 > news:[email protected]...
 > > i tried that but no luck. any other suggestions?
 > > peter
 > >
 > > "Ohad Shany" <[email protected]> wrote in message
 > > news:[email protected]...
 > > > Is your EJB classes on the servlet classpath?
 > > > (weblogic.httpd.servlet.classpath property)
 > > >
 > > > I had some strange casting problem when my EJB classes was on the
 > servlet
 > > > classpath
 > > > and it was gone when i moved them to the weblogic.class.path . Worth a
 > > try.
 > > >
 > > > OHAD
 > > >
 > > > Peter Ghosh wrote:
 > > >
 > > > > i am trying to instantiate and ejb from a servlet but it gives me the
 > > > > following error. the configuration and code that generated this error
 > is
 > > > > attached below.
 > > > > oddly enough the same chunk of code works fine in a stand alone client
 > > if
 > > > > j2ee.jar;weblogic\classes and weblogicaux.jar are included in the
 > > classpath.
 > > > > any help would be appreciated.
 > > > > peter
 > > > >
 > > > > -8787844: in servlet.Webmedx.init
 > > > > -8787844: null
 > > > > java.lang.ClassCastException
 > > > > at
 > > > > com.sun.corba.ee.internal.javax.rmi.PortableRemoteObject.narrow(Porta
 > > > > bleRemoteObject.java:296)
 > > > > at
 > > > > javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
 > > > > at webmedx.servlet.Webmedx.init(Webmedx.java:23)
 > > > > at javax.servlet.GenericServlet.init(GenericServlet.java:258)
 > > > > at
 > > > > weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubIm
 > > > > pl.java:474)
 > > > > at
 > > > > weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStub
 > > > > Impl.java, Compiled Code)
 > > > > at
 > > > > weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubI
 > > > > mpl.java:422)
 > > > > at
 > > > > weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.
 > > > > java:187)
 > > > > at
 > > > > weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
 > > > > pl.java:118)
 > > > > at
 > > > > weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
 > > > > textImpl.java:760)
 > > > > at
 > > > > weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
 > > > > textImpl.java:707)
 > > > > at
 > > > > weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
 > > > > ContextManager.java:251)
 > > > > at
 > > > > weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
 > > > > a:369)
 > > > > at
 > > > > weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:269)
 > > > >
 > > > > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
 > > > > Code)
 > > > >
 > > > > configuration:
 > > > >
 > > > > WebLogic startup settings are presently:
 > > > >
 > > > > CLASSPATH Prefix
 > > > > \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 > > > > logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar
 > > > > CLASSPATH
 > > > > \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 > > > >
 > >
 > logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar;\weblo
 > > > > gic\
 > > > >
 > >
 > jre1_2\lib\tools.jar;\weblogic\jre1_2\jre\lib\rt.jar;\weblogic\jre1_2\jre\li
 > > > > b\i1
 > > > >
 > >
 > 8n.jar;C:\weblogic\license;C:\weblogic\classes\boot;C:\weblogic\classes;C:\w
 > > > > eblo
 > > > > gic\lib\weblogicaux.jar;C:\weblogic\eval\cloudscape\lib\cloudscape.jar
 > > > > JAVA_HOME \weblogic\jre1_2
 > > > > WEBLOGIC_LICENSEDIR C:\weblogic\license
 > > > > WEBLOGIC_HOME C:\weblogic
 > > > > system properties:
 > > > > java.security.manager
 > > > > java.security.policy=\weblogic\weblogic.policy
 > > > > weblogic.system.home=\weblogic
 > > > > java.compiler=symcjit
 > > > >
 > > > > weblogic.class.path=\weblogic\lib\weblogic510sp5.jar;\weblog
 > > > > ic\license;\weblogic\classes;\weblogic\lib\weblogicaux.jar
 > > > > INITIAL_HEAP 64 MB
 > > > > MAX_HEAP 64 MB
 > > > > SERVERCLASSPATH
 > > > > \weblogic\lib\weblogic510sp5boot.jar;\j2ee\lib\j2ee.jar;\web
 > > > >
 > >
 > logic\lib\servlet.jar;\weblogic\lib\jaxp.jar;\weblogic\lib\parser.jar;\weblo
 > > > > gic\
 > > > >
 > >
 > jre1_2\jre\lib\rt.jar;\weblogic\jre1_2\jre\lib\i18n.jar;C:\weblogic\classes\
 > > > > boot
 > > > > ;C:\weblogic\eval\cloudscape\lib\cloudscape.jar
 > > > >
 > > > > Type "wlconfig -help" for program usage.
 > > > >
 > > > > code:
 > > > >
 > > > > public void init() throws ServletException{
 > > > > try{
 > > > > Log.debug("in servlet.Webmedx.init");
 > > > > Properties h = new Properties();
 > > > > h.put(Context.INITIAL_CONTEXT_FACTORY,
 > > > > "weblogic.jndi.WLInitialContextFactory");
 > > > > h.put(Context.PROVIDER_URL, "t3://localhost:7001");
 > > > > Context initial = new InitialContext(h);
 > > > > Object objref = initial.lookup("webmedx/pool");
 > > > > webmedxpoolhome =
 > > > >
 > > > >
 > >
 > (WebmedxPoolHome)PortableRemoteObject.narrow(objref,WebmedxPoolHome.class);
 > > > > }catch(Exception ex){
 > > > > Log.error(ex);
 > > > > }
 > > > > }
 > > >
 > >
 > >

Servlet cannot find helper class

Hello
Under WEB-INF/classes I put ServletExample and SingletonExample. Compiling ServletExample, that makes use of SingletonExample, works.
In the directory WEB-INF/classes I also have another direcotry, test. And in WEB-INF/classes/test I put again ServletExample and SingletonExample.
Here I have tried in several ways to compile the servlet, but I always get an:
Cannot find symbol class SingletonExample.
I tried writing package test at the top of both files, and even at the top of only one of these two.
I even tried to make WEB-INF/classes/test/ServletExample make use of SingletonExample residing in WEB-INF/classes, but I didnt succeded.
What happens when you have subdirectory in WEB-INF/classes/? I think this is a MUST, to have subdirectory in large webapplication, so I really dont want to put everything in the classes directory.
Do you how to resolve this prolem? And: if Im in WEB-INF/classes/test and want to referr from a servlet residing in this direcory to a Singleton/helper class residing in WEB-INF/classes/, which approach do I have to use?
Thanks
Paolo

Jeez, you aren't gonna get very far in Java like this.
CLASSPATH is wrong - again. You're supposed to give JARs and paths where the class loader is supposed to look, not the actual .class file.
Also, you're not telling the compiler to put the .class file in the package directory structure.
Your example is pretty awful. Try this:
Put this code into c:\common
package common;
import common.test.TestDown; // What the hell is this? There is no package test, but there is a package named common.test
public class TestUp
 public void sayHello()
 System.out.println("Hello.....");
}Put this code into c:\common\test
package common.test;
import common.TestUp;
public class TestDown
 public TestDown()
 TestUp testUp = new TestUp();
 testUp.sayHello();
 public static void main(String[] args)
 new TestDown();
}Open a command shell and navigate to c:\, then do the following:
Directory of c:
07/01/2005 03:43 PM <DIR> .
07/01/2005 03:43 PM <DIR> ..
07/01/2005 03:45 PM <DIR> common
 0 File(s) 0 bytes
 3 Dir(s) 74,909,675,520 bytes free
C:\>javac -d . common\*.java
C:\>javac -d . common\test\*.java
C:\>java -classpath . common.test.TestDown
Hello.....Once you've got your head around this, go learn Ant and have it compile your projects properly.
%

Very Urgent !!! Exception in looking up Local EJB from Servlet in WSAD 5.1

Hi,
I have a servlet and a local EJB. The servlet and EJB are deployed on same application server but in different J2EE applications i.e. different EAR files.
When I lookup an EJB with remote interfaces from servlet everything works fine. But when I try to lookup EJB with local interfaces from
Servlet I get following Exception.
Exception Stack: -
========================================================
avax.naming.NameNotFoundException: Context: localhost/nodes/localhost/servers/server1, name: TestLocalHome: First component in name TestLocalHome not found. Root exception is org.omg.CosNaming.NamingContextPackage.NotFound: IDL:omg.org/CosNaming/NamingContext/NotFound:1.0
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.ipcos.WsnOptimizedNamingImpl.do_resolve_complete_info(WsnOptimizedNamingImpl.java:968)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.cosbase.WsnOptimizedNamingImplBase.resolve_complete_info(WsnOptimizedNamingImplBase.java:1399)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.WsnOptimizedNaming._NamingContextStub.resolve_complete_info(Unknown Source)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.cosResolve(CNContextImpl.java:3491)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1519)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1480)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.lookupExt(CNContextImpl.java:1187)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1067)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:132)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.naming.InitialContext.lookup(InitialContext.java:360)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at org.apache.jsp._DomainClient._jspService(_DomainClient.java:95)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.jsp.runtime.HttpJspBase.service(HttpJspBase.java:89)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.jsp.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:344)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.serviceJspFile(JspServlet.java:669)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.jsp.servlet.JspServlet.service(JspServlet.java:767)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:983)
[12/8/05 14:14:05:047 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:564)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:439)
[12/8/05 14:14:05:062 IST] 7debf35b SystemErr R      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)
========================================================
Please help asap.
Regds
VJ.

The ejb spec only defines local ejb access within the same application. It's possible some app servers support access from a different application but it wouldn't be portable, nor would it work within the J2EE SDK or Sun Java System App Servers. To access a local ejb from a web component or ejb , define an ejb-local-ref in the client component's standard .xml file (web.xml or ejb-jar.xml) and use the ejb-link element to specify the ejb-name of the target ejb.
--ken

Loading remote EJB from servlet using jakarta and openejb

I am trying to create an environment where I use
openejb as my EJB container, and JAKARTA Tomcat
as my
Servlet/JSP container. However,
i'm having a problem in lookingup my remote EJB from my
jakarta application.
That exact code works perfectly if I run it standalone. I
am using the same JRE. Jakarta has also loaded the
openejb-0.8.3.jar and openejb_client-0.8.3.jar
What I dont understand is why jakarta
would behave differently than command-line java when I
am
running in the same JRE on a single machine.
Any help would be much appreciated.

Several fairly major improvements have been maid in OpenEJB specifically for the Tomcat people. For one, the whole way you integrate them has completely been rewritten. Now all you have to do is copy a openejb_loader-0.9.1.war into the Tomcat webapps directory and change an init-param in it. Pretty straight forward. OpenEJB 0.8.3 won't work with Tomcat in the same VM, however OpenEJB 0.9.0 and up have been totally revamped in all things related to classloading so that it can co-exist with Tomcats unique classloading architecture.
O'Reilly just published an article detailing the ins and outs of the integration, it's a pretty good read:
http://www.onjava.com/pub/a/onjava/2003/02/12/ejb_tomcat.html

Unable to call EJB from servlet

Fillowing is my ejb module
package univesity;
import java.rmi.RemoteException;
import javax.ejb.*;
public interface EnrollmentCartHome extends javax.ejb.EJBHome
 EnrollementCartObject create() throws CreateException,RemoteException;
package univesity;
import java.rmi.RemoteException;
public interface EnrollementCartObject extends javax.ejb.EJBObject
 public void addCourse(int courseID) throws RemoteException;
package univesity;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class EnrollementCartEJBBean implements SessionBean
 int courseID;
 public void ejbActivate() throws EJBException, RemoteException {
 // TODO Auto-generated method stub
 public void ejbPassivate() throws EJBException, RemoteException {
 // TODO Auto-generated method stub
 public void ejbRemove() throws EJBException, RemoteException {
 // TODO Auto-generated method stub
 public void setSessionContext(SessionContext arg0) throws EJBException,
 RemoteException {
 // TODO Auto-generated method stub
 public void addCourse(int courseID)
 System.out.println("i am in add course");
 System.out.println("i am in add course--->"+courseID);
 public void ejbCreate() throws CreateException
 System.out.println("i am in ejbCreate");
 courseID=0;
}ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
 "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
 <jndi-name>ejb/EnrollmentCartHome</jndi-name>
<ejb-jar>
 <description>Simplest Statefull Session Bean</description>
 <display-name>University EJB</display-name>
 <enterprise-beans>
 <session>
 <ejb-name>Enrollement</ejb-name>
 <home>university.EnrollementCartHome</home>
 <remote>university.EnrollementCartObject</remote>
 <ejb-class>university.EnrollementCartEJBBean</ejb-class>
 <session-type>Statefull</session-type>
 <transaction-type>Bean</transaction-type>
 </session>
 </enterprise-beans>
</ejb-jar>here is my servlet
package university;
import javax.naming.InitialContext;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class EnrollCourse extends javax.servlet.http. HttpServlet
 public void doGet(HttpServletRequest req,HttpServletResponse res)
 public void doPost(HttpServletRequest req,HttpServletResponse res)
 try {
 InitialContext ic = new InitialContext();
 Object objRef = ic.lookup("ejb/EnrollmentCartHome");
 university.EnrollementCartHome home=(university.EnrollementCartHome)javax.rmi.PortableRemoteObject.narrow(objref, university.EnrollementCartHome.class);
 university.EnrollementCartObject obj=(university.EnrollementCartObject)home.create();
 obj.addCourse(5);
 catch (Exception ex)
 { ex.printStackTrace(); }
}i am getting following error
java.lang.Error: Unresolved compilation problems:
 university.EnrollementCartHome cannot be resolved to a type
 university.EnrollementCartHome cannot be resolved to a type
 objref cannot be resolved
 university.EnrollementCartHome cannot be resolved to a type
 university.EnrollementCartObject cannot be resolved to a type
 university.EnrollementCartObject cannot be resolved to a type
 university.EnrollCourse.doPost(EnrollCourse.java:24)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

Thanks for your continuous reply
i solved all problems i have posted but now i am facing new problem that "EJB is already registerd"
giving you stack trace
15:21:22,109 WARN [ServiceController] Problem creating service jboss.j2ee:module=UniversityProjectEJBModule.jar,uid=22223562,service=EjbModule
javax.management.InstanceAlreadyExistsException: jboss.j2ee:jndiName=ejb/EnrollmentCartHome,service=EJB already registered.
 at org.jboss.mx.server.registry.BasicMBeanRegistry.add(BasicMBeanRegistry.java:761)
 at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:225)
 at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
 at org.jboss.mx.server.MBeanServerImpl$3.run(MBeanServerImpl.java:1422)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:1417)
 at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:376)
 at org.jboss.ejb.EjbModule.createService(EjbModule.java:373)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalCreate(ServiceMBeanSupport.java:260)
 at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:243)
 at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)

Unable to access EJB from servlet

Hi,
I have in service method my servlet code.
Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.ApplicationInitialContextFactory");
 env.put(Context.PROVIDER_URL, "ormi://localhost/hello");
 env.put(Context.SECURITY_PRINCIPAL, "admin");
 env.put(Context.SECURITY_CREDENTIALS, "mypwd");
 Context ctx = new InitialContext(env);
 Object obj = ctx.lookup("HelloName");
 HelloHome home = (HelloHome) javax.rmi.PortableRemoteObject.narrow(obj, HelloHome.class);
 Hello hello = home.create();
this is how i have orion-ejb-jar.xml
 <enterprise-beans>
 <session-deployment name="Hello" location="HelloName" >
 </session-deployment>
 </enterprise-beans>
 ejb-jar.xml
 <session>
 <ejb-name>Hello</ejb-name>
 <home>examples.HelloHome</home>
 <remote>examples.Hello</remote>
 <local-home>examples.HelloLocalHome</local-home>
 <local>examples.HelloLocal</local>
 <ejb-class>examples.HelloBean</ejb-class>
 <session-type>Stateless</session-type>
 <transaction-type>Container</transaction-type>
 </session>
When i access the servlet i get this error.
javax.naming.NameNotFoundException: HelloName not found
 at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:149)
 at com.evermind.server.ApplicationContext.lookup(ApplicationContext.java:217)
 at com.evermind.server.ApplicationContext.lookup(ApplicationContext.java:88)
 at javax.naming.InitialContext.lookup(InitialContext.java:345)
 at examples.HelloServlet.service(Unknown Source)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:772)
 at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:317)
 at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:782)
 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
 at java.lang.Thread.run(Thread.java:479)
Is location attribute in orion-ejb-jar.xml used to specify JNDI name? Can i get the JNDI tree showing the name mappings in oc4j? How do i correct this error?
Ravi

Ravi --
The most portable and standards oriented solution is to define an ejb-ref in the web.xml for the servlet, and then look up the name using the formal EJB UNC model.
web.xml:
<ejb-ref>
<ejb-ref-name>ejb/AppSessionFacadeHome</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>faqapp.ejb.AppSessionFacadeHome</home>
<remote>faqapp.ejb.AppSessionFacade</remote>
</ejb-ref>
servlet lookup
InitialContext ctx = new InitialContext();
Object homeObject = ctx.lookup("java:comp/env/ejb/AppSessionFacadeHome");
EJBHome ejbHome = (EJBHome)
portableRemoteObject.narrow (homeObject, AppSessionFacadeHome.class);
cheers
-steve-

Try to print something from Servlet on JSPages help out pls :(

hi guys
im new to servlets so as a learning process i try to create a method call write() in make_menu.java
the codes goes like this
=========================
import javax.servlet.*;
import javax.servlet.http.*;
public class make_menu extends HttpServlet
 public void write() {
 System.out.println("lalala");
==========================
so when i call write(), its suppose to print out "lalala" on my jsp page where i call it.
Here is my jsp page code
==========================
<%@ page import="make_menu" %>
<jsp:useBean id="beanie" class="make_menu" scope="session"/>
<%
beanie.write();
%>
=========================
i assume when i load this page, beanie.write() is invoked and hence is suppose to print out "lalala" on my webpage
but all i got is a blank page :(
how do i write the print in my servlet ?
is it not System.out.println ?
pls help thanx alot

alright changed the codes abit
imported java.io.* for the printerwriter
================================
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class make_menu extends HttpServlet
 public void write() {
 //System.out.println("lalala");
 PrintWriter out = response.getWriter();
 out.println("lalala v2");
================================
howeverr upon compiling got this error :((
================================
C:\Program Files\Apache Tomcat 4.0\webapps\ROOT\WEB-INF\classes\make_menu.java:10: cannot resolve symbol
symbol : variable response
location: class make_menu
 PrintWriter out = response.getWriter();
^
1 error
===============================
is there any library to be imported to solve this response thingy?

Help!! Can not find ejb from servlet!!!

I have tried several days...here is my code to look up ejb..
Context context = new InitialContext();
Object ref = context.lookup("CustomerFacade");
//Object ref = context.lookup("CustomerFacade");
facadeHome = (CustomerFacadeHome) PortableRemoteObject.narrow(ref, CustomerFacadeHome.class);
facade = facadeHome.create();
do I need a orion-ejb-jar.xml? oc4j will generate it, right?
Do I need a ejb-ref tag in the web.xml file? I've tried to use JDev to develop an example..the file it generates doesn't have ejb-ref tag at all..however..it works...
the problem is that I want to port an app from JBoss to OC4J....so I cannot use JDev to develop from scratch...
Please help me~~~I am stuck for several days...

Next step it to restore to factory defaults in case there is some corruption which is now in the backup. If that does not work then you may have a hardware problem.

Problem accessing ejb from servlet

Hi,
I'm aving a problem accessing a stateful session bean from a servlet. I'm using a jndi lookup to do it because I need that a client has its own bean reference...
My code into the service method is:
InitialContext ctx;
try {
ctx = new InitialContext();
carrelloService = (CarrelloLocal)ctx.lookup("java:comp/env/ejb/Carrello");
and I have a reference to EJB into web.xml:
<ejb-local-ref>
<ejb-ref-name>ejb/Carrello</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home></local-home>
<local>carrello.model.CarrelloLocal</local>
</ejb-local-ref>
If I use @EJB annotation to inject the servlet, it works fine.
Instead using jndi lookup throws a NamingException because it doesn't find java:comp/env/ejb/Carrello entry.
Any idea about the problem?

Here's something simple that I have that works:
 
SimpleBean
 
@Stateless(name="SimpleBean")
public class SimpleBeanBean implements SimpleBeanLocal {
 
web.xml; -- note I use a whacko ejb-ref-name just to make it obvious where I'm using it.
 
 <ejb-local-ref>
 <ejb-ref-name>ejb_mapping_doodad/SimpleBean</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <local>sab.otn681398.ejb.SimpleBeanLocal</local>
 </ejb-local-ref> 
servlet:
 
package sab.otn681398.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.*;
import javax.servlet.http.*;
import sab.otn681398.ejb.SimpleBeanLocal;
public class TestServlet extends HttpServlet {
 private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
 private static final String SIMPLE_BEAN_JNDI = "ejb_mapping_doodad/ASimpleBean";
 private final boolean USEENC = true;
 private SimpleBeanLocal simple = null;
 public void init(ServletConfig config) throws ServletException {
 super.init(config);
 public void doGet(HttpServletRequest request,
 HttpServletResponse response) throws ServletException, IOException {
 response.setContentType(CONTENT_TYPE);
 PrintWriter out = response.getWriter();
 try {
 if(simple==null) {
 simple = createSimple();
 } catch(NamingException ne) {
 throw new ServletException("Error in looking up the EJB", ne);
 out.println("<html>");
 out.println("<head><title>TestServlet</title></head>");
 out.println("<body>");
 out.printf("The %s bean has been hit: %s times", simple, simple.getHitCount());
 out.println("</body></html>");
 out.close();
 private SimpleBeanLocal createSimple() throws NamingException {
 return (USEENC==true? createSimpleViaENC(): createSimpleViaName());
 private SimpleBeanLocal createSimpleViaENC() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup("java:comp/env/" + SIMPLE_BEAN_JNDI);
 return simple;
 private SimpleBeanLocal createSimpleViaName() throws NamingException {
 InitialContext ic = new InitialContext();
 SimpleBeanLocal simple = (SimpleBeanLocal)ic.lookup(SIMPLE_BEAN_JNDI);
 return simple;
} 
-steve-

Error in calling EJB from servlet

I've create a servlet as a client bean to call EJB
 I deploy the EJB, copy the servlet class (in .class format)
 (\config\<domain>\serverclass) and
 jsp to Weblogic 6.0
 When I run the JSP, It said that the EJB class not found.
 Please help
 Fannie


Additional information :
 I added the path where ejb jar file located to the calsspath in
 startWebLogic.sh
 Thanks!!
 Fannie
 Fannie <[email protected]> wrote in message
 news:3ac84447$[email protected]..
 > I've create a servlet as a client bean to call EJB
 > I deploy the EJB, copy the servlet class (in .class format)
 > (\config\<domain>\serverclass) and
 > jsp to Weblogic 6.0
 > When I run the JSP, It said that the EJB class not found.
 >
 > Please help
 >
 > Fannie
 >
 >
 >
 >

Reference EJB from servlet's action/helper classes

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