JPA ClassNotFoundExceptiona at runtime in J2EE application

I created a JPA project for my Web application in IBM Rational Application Developer v7.5. JPA project classes are NOT FOUND at run time when those are referred from web application. I followed the below steps to create Web/JPA project in RAD 7.5. Please look at my RAD project structure in the link - [Project Structure|http://img690.imageshack.us/img690/8831/rad75webjpaprojectsetup.jpg]
1. Created a EAR project called MySampleEAR
2. Created a dynamic web project
- project name: MySampleWeb
- Target Runtime: Websphere Application Server 7.0
- Dynamic Web module version 2.5
- Configuration : Default configuration for WAS 7.0
- Selected "Add project to EAR" and selected the EAR - MySampleEAR
- Finished it
3. Created JPA Project
- Project name : MySampleJpa
- Target Runtime : WAS7
- Configuration : Utility JPA Project with 5.0
- Selected Add project to an EAR : MySampleEAR
- In the next screen, Platform: RAD JPA platform
- Use implementation provided by runtime
- Left rest as default options
4. Created a very basic class in JPA project under src dir
package com.mysample.persistence;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table (name="USERS")
public class Users implements Serializable {
     @Id
     @Column(name="USER_ID")
     private long userId;
     private static final long serialVersionUID = 1L;
     public Users() {
          super();
     public long getUserId() {
          return this.userId;
     public void setUserId(long userId) {
          this.userId = userId;
}5. Added MySampleJpa project into web project's (MySampleWeb) build path.
6. Created a simple Servlet in the web project and mapping the web.xml file is created by RAD. When I import import com.mysample.persistence.Users, no compilation error and able to refer Users object.
My Servlet code is below:
package com.mysample.web;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mysample.persistence.Users;
* Servlet implementation class SampleServlet
public class SampleServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          new Users();
}Now, run/deploy the ear file into WAS 7, Try to load the servlet uri in the browser: http://localhost:9081/mysampleweb/sampleservlet/
Getting the below ClassNotFoundE in the server console.
[9/11/10 10:24:04:218 EDT] 0000001f servlet       E com.ibm.ws.webcontainer.servlet.ServletWrapper service SRVE0068E: Uncaught exception created in one of the service methods of the servlet SampleServlet in application MySampleEar. Exception created : java.lang.NoClassDefFoundError: com.mysample.persistence.Users
     at com.mysample.web.SampleServlet.doGet(SampleServlet.java:19)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1661)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:937)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:500)
     at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
     at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3826)
     at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
     at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
     at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
     at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:455)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:384)
     at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:272)
     at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
     at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
     at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
     at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
     at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
     at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
     at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
     at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
     at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550)
Caused by: java.lang.ClassNotFoundException: com.mysample.persistence.Users
     at java.net.URLClassLoader.findClass(URLClassLoader.java:419)
     at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:150)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:643)
     at com.ibm.ws.bootstrap.ExtClassLoader.loadClass(ExtClassLoader.java:90)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:609)
     at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:62)
     at com.ibm.ws.classloader.ProtectionClassLoader.loadClass(ProtectionClassLoader.java:58)
     at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:508)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:609)
     at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:508)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:609)
     ... 25 more

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org.apache.commons.digester.Digester.getFactory(Digester.java:512) at
org.apache.commons.digester.Digester.getParser(Digester.java:686) at
org.apache.commons.digester.Digester.getXMLReader(Digester.java:902) at
org.apache.commons.digester.Digester.parse(Digester.java:1567) at
org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1433) at
org.apache.struts.action.ActionServlet.init(ActionServlet.java:466) at javax.servlet.GenericServlet.init(GenericServlet.java:258) at
oracle.jheadstart.controller.struts.JhsActionServlet.init(JhsActionServlet.java:219) at
com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.loadServlet(HttpApplication.java:2094)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.findServlet(HttpApplication.java:4523)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2561)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:640)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:208)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:125)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:568)
Any information would be helpful,
Vladimir,
MAOP d.o.o., Slovenia

Figures, I've been fighting with this for the past day and a half and I figure it out shortly after I post the question.
It turns out the tiles.jar that was in our WEB-INF/lib directory was an old one. It looks like the newer struts.jar (from jdeveloper) we're using includes the tiles information. Once I removed tiles.jar, commons-dbcp, pool, resources, and services, it works now.
It looks like jdeveloper overwrites most of those files with it's built in struts integration, and we've just been lucky before that struts.jar was being loaded before tiles.jar and something with oas 10.1.3 is loading the jars in a different order--but I'm just guessing here.

Web Dynpro API directly from within a J2EE application

hello,
Can we call webdynpro API directly from a J2EE application.
If it is possible, what all will be required at compile time and runtime.
Please advice, If an additional configuration is also required.
Thanks in advance
Mona

Hi,
Check the below link u will get an idea...
Configuration about J2EE engine
http://help.sap.com/saphelp_nw70/helpdata/en/a6/6980424dd7d665e10000000a155106/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/en/4a/b62640632cec01e10000000a155106/frameset.htm
Sample applications,
http://help.sap.com/saphelp_nw70/helpdata/en/f6/4345e8238fcd418197d6692e59d673/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/en/f6/baba3eb645dc61e10000000a114084/frameset.htm

Error while running a J2EE application on Oracle10gAS

Hi,
I am receiving an error when trying to run a J2EE application on Oracle10gAS. The application runs successfully on Oracle9iAS, but throws the following exception on 10g application server:
<?xml version="1.0" encoding="UTF-8" ?>
- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
- <SOAP-ENV:Body>
- <SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>com.evermind.server.rmi.OrionRemoteException: Error in createInstance(): null; nested exception is: java.lang.NoClassDefFoundError</faultstring>
<faultactor>/STAR-TicketBroker-context-root/TicketBrokerWS</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Does anyone have any idea why I would be receiving this
error? We are using Session EJBs in our J2EE application. Are there any changes needed in the code in order to migrate a J2EE application from 9i to 10g ???
Please help.
Thanks,
-Prashant

Hi Somil,
I've just had this same error message, and it was because I had a bogus character in my JSP sources. I'd cut-and-pasted the text from a Word document, and it included the "registered trademark" sign (an R in a circle) as a single character. This worked in my test environment, but not in my production environment (where presumably the default encoding is different). I replaced the character with the equivalent HTML entity &reg; (ie. the five characters & r e g ; ) and it all worked.
Have a look through the offending JSPs and see whether you have any characters that might be incompatible with your default encoding (anything that isn't plain old 7-bit ASCII is potentially a problem). Change them to HTML entities and you should be fine.
Hope this helps,
Richie

SSO to J2EE application from SAP Portal

Hi
I am trying to do SSO from SAP Portal to a J2EE engine which runs on SAP Web AS.
Here are my queries
1. When I deploy a J2EE application on Web AS , I dont get any login screen. How can I make sure that if a user wants to access this J2EE application he should get a login screen and provide his login credentials first, only then would he be able to access the J2EE application.
2.When I am done with Part 1. If a user tries to access this J2EE application from the Portal (asuming the user Id's in Portal and J2EE application are same and both are in the same domain) , I should not get any login screen and should be able to view the J2EE application.
3.I want to use SAP Logon tickets generated by the Portal to enable SSO.
I have done all the necessary configurations in the J2EE server.
1. Imported the Portal's verify.der certificate.
2. Adjusted the login modules stack for the application accordingly.
Can anyone please help me out with this or throw some light.
Please help.
Thanks in advance,
Vivek
PS - Points will be definitely rewarded

Hi Vivek,
Let me give you the solution for both questions differently.
Ques 1. When I deploy a J2EE application on Web AS , I dont get any login screen. How can I make sure that if a user wants to access this J2EE application he should get a login screen and provide his login credentials first, only then would he be able to access the J2EE application.
Ans: For doing this in the code of your J2EE application you have to write a if statement which will check if the user ID is coming from the backend or not. If yes then you display that logon page else you just pass that username which is coming from backend and displ;ay the page accordingly.
Ques 2.When I am done with Part 1. If a user tries to access this J2EE application from the Portal (asuming the user Id's in Portal and J2EE application are same and both are in the same domain) , I should not get any login screen and should be able to view the J2EE application.
Ans: Yes, this is what I am explaining you. Even I had also made same kind of J2EE application in which if the user is coming from the backend then he/she will look the J2EE screen else if the username is not coming then he will se the Login screen. Exactly same as what are looking for.
3.I want to use SAP Logon tickets generated by the Portal to enable SSO.
Ans: I have used User Mapping instead of SAP Logon ticket. Well that is also the option for SSO but personally I think User Mapping is easy and better way for implementing SSO.
I dont know whether this will help you or not. Please let me know. I can definately help if you want to implement SSO using User Maping.
Regards
Pravesh
PS: Please dont forget to reward points.

SSO:Portal to J2EE Application

Hi all,
I have developed a simple java application that has user-id & password textboxes along with a submit button.(login.jsp)
this is deployed as an iView in the server.
When the submit button is clicked,it navigates 2 another JSP page(welcome.jsp) that displays the user's name if the id and passowrd matches with that present in the backend DB.
I want 2 display this welcome page directly without prompting for a logon frm the user.
How can i do this with AppIntegrator?I referd the following <a href="https://www.sdn.sap.com/irj/sdn/thread?threadID=95024">thread</a>I cant find the system uri,in the source code of the application!
How should i proceed further?
Thanks in advance.
anticipating replies
SwarnaDeepika

Hi Swarna,
Kindly try these steps..I have accumulated the points as per the discussions on mail.
Just try all these steps..
1) I hope you have created a J2EE application which has its own data source (i.e: tables in the Data Dictionary which has enteries for user and Password).
2) Create a HTTP system for usermapping.
3) After that perform all the steps as mentioned in the WebLog for the App integrator. (i.e: do the user mapping to the system by providing the User name and password.)
4) In the J2EE Application write the code that If that username which you got from the URL and the userName in your data source is same then show him the main page directly, else show him the Login Page.
5) Create a URL View in which you can put your application. Set the admin,user property from the User Management.
I hope all these will solve your problem!! Kinldy check this!!
Regards
Pravesh

Unable to connect to the OracleForms application through a J2EE application

Hi there,
I have deployed a custom J2EE application in Middleware instance of my Oracle 10g AS 10.1.2
The application is sso enabled . Once a user logs in the application he is able to see a jsp in which i display hyperlinks for him to access.
One of these hyperlinks is pointing to the forms application.
the url is http://psc-pc0592:7778/forms/frmservlet?config=abs_deploy[b]
Once i click on the URL the forms applet begins to load but as the applet opens up i get the database logon screen.This should not happen
I am already logged and have been verified by sso.
Also the forms configuration is associated with a datasource.
I am not able to get as to why i get that screen when it shoud directly connect to the forms application.
Any help on this is appreciated.
Thanks & Regards,
Madhur Pant

when you go through your carrier provider, there is an additional step in the SSL tunnel. Not sure how this transcribes, but it is possible that your carrier does not use the same port as the one you want it to use.
The search box on top-right of this page is your true friend, and the public Knowledge Base too:

J2EE application access from Portal - P4ObjectBroker

hey all,
I want to access access a J2EE application (Web Service) from a Portal Component. The documentation at http://help.sap.com/saphelp_nw04/helpdata/en/c0/a584409db95537e10000000a1550b0/content.htm shows an example.
They import the package com.sap.engine.services.rmi_p4.P4ObjectBroker. I cannot find the package on my system, i.e. my local portal installation.
Does anybody know what kind of package is required, or where I can find this package...
many thanks in advance
cheers Sascha

Hey Sascha,
the P4ObjectBroker is part of the implementation of the P4 Provider Service on the J2EE Engine. It is part of the com.sap.engine.services.rmi_p4 package.
If you can't find it I recommend you to search it using ClassLocator, it is a plugin that indexes all your packages and locates the propar class for you.
You can download it at this link: http://sourceforge.net/projects/classlocator
Read the instructions of how to use it with the NWDS, it is really simple. If you need more help do tell me.
Regards,
Roy

How to access a Portal User Info from a J2EE application?

Hi,
I have deployed a j2ee application in portal and its running fine.
from that application i need to assign some roles to some users.i have the user id.
so my doubt is can i access the portal user info from this j2ee application?i have some servlets in the j2ee application....can i get the portal user info from this servlet?
plz help me
regards,
Visweswar

Hi,
Please check out this to get the portal user information from Java -
WdClientUser class/Interface to aciehve this.
Please check out these links on the same -
WDClientUser.getClientUser IUser
help needed
Regards
Lekha

JPA ClassNotFoundExceptiona at runtime in J2EE application

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