Enterprise JavaBean Model

Hi All ,
I am working on NWCE 7.1 . I have created Enterprise JavaBean model for sessions beans. I am refereing this tutorial link
https://help.sap.com/saphelp_nwce10/helpdata/en/45/f7fe8caea471fae10000000a1553f6/frameset.htm
But when i am rendering view inputfield for my input model attribute is read only. I have set cardinality of my request node to 1..1. still whn i am binding input model attribute under request node , its showing readinly whn view is rendered.
If i try to access request node using wdcontext.nodeRequest().size() i am getting exception as " model node element cannot be created without a model instance ". Read only property of inputfiled is set to fasle.Plz let me know how to resolve tihs.
Regards
Kavita

Hi Kavita,
Make sure your EJB application is deployed and started. If so, check whether its binaries (jar files) contain all the needed classes. The files are situated under /usr/sap/<SID>/JC<num>/j2ee/cluster/apps/<vendor>/<appName>/applicationjars/. Check also whether you EJB contains all the methods you are using from the Web Dynpro application.
Also search for any suspicious exceptions in the defaultTrace files (/usr/sap/<SID>/JC<num>/j2ee/cluster/server0/logs/). If any, please post here.
My final guess: have you added the last code snippet as shown here (in wdDoInit method):
https://help.sap.com/saphelp_nwce10/helpdata/en/45/f7f4c0c98d3482e10000000a1553f6/content.htm
Note that you should use the fully qualified name of the model, which means both the package and the class name, when registering the instance.
Best regards,
Vesselin

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using CAF BO inside WD Java is a little bit problematic!
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This datatype is not bindable to context attributes, cause wd is only supporting native java types.
in this case, a java.sql.date is needed.
What is the best practise to use JavaBean Models (CAF BOs) with attributes of type "Date"?
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Using CAF external services, all ABAP Dates are exposed also as XMLGregorianCalendar.
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Holger

Hi Roelof,
CAF automatically decides which datatypes are used. It is not possible to change the used datatype
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Holger

While trying to import an Enterprise Javabean Model "No EJBs available"

Hi,
I´ve facing the following problem, it was working but suddenly it stopped.
I´ve created an EAR project that contains an EJB project, the EJBs are add to the public part, at least all the java classes that I want to access and the ear has another public part that references to the EJB public part, when I try to import it on Web Dynpro trying to create e new Enterprise javabeans it says to me that:No EJBs available, in fact it shows the project that contains the ejb but when i check and go next to list the EJB files in that project it says: No EJBs available.
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Hi
I think you forget one step : Copy the java bean that access EJBs into this web dynpro dc.
[Help1|Using EJB in Webdynpro
Best Regards
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Hi all,
I have been following the tutorial "Using EJBs in Web Dynpro Applications" for creating a customized LOCAL webdynpro application, based in javabean Model. It was made by just exporting the JAR file from a java project, as it is explained in the tutorial. OK.
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Thanks Jhansi,
Yes, you are right. I had already followed those steps. The error comes when I have to select between the JavaBean Source:
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Web Service model vs JavaBean Model

Hi there,
My business logic is made with EJBs ... and now i'd like to know the pros and cons between working with the javabean model or make available my Ejbs as Web service and use the webservice model ?
Regards,
Frantz

Hi Frantz,
Using EJB:
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In order to use the existing functions in the Web Dynpro application, we will import a model that facilitates their usage. The JavaBean importer is used to import the model. Strictly speaking, it would be possible to import a session bean using the JavaBean importer. The result would be a model class without any properties. Since you can only bind properties, not methods, to UI elements, this would not make sense. Thus, we will have to implement a command bean in the form of an intermediate layer, which serves as the input for the JavaBean import and provides the necessary properties.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webdynpro/creating an email-client using web dynpro and web services.pdf
Also refer to this document https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webdynpro/using ejbs in web dynpro applications.pdf
Thanks,
Raj.

Import JavaBean Model - Invalid class

Hi,
I wanted to import a JavaBean Model as described in the Tutorial "Using EJBs in Web Dynpro Applications" (see: https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c).
Problem: i always get an error "Invalid class - JavaBean not available for import", when i want to select a local jar file as JavaBean source, althrough the jar-file contains a valid bean.
Note:I also dont have a radio button in my GUI for selecting "Deploy time" as mentioned in the Tutorial and as i have seen in a screenshot in the Blog /people/balaramnaidu.bankuru/blog/2006/04/23/importing-complex-javabean-model-into-webdynpro-by-creating-relationships-for-the-model-classes . in this Blog there is already a question about this, but this question has never been aswered...

Wolfgang,
See my tips on troubleshooting JavaBean Model Import: /people/valery.silaev/blog/2005/08/30/javabean-model-import-when-it-really-works
Valery Silaev
SaM Solutions
http://www.sam-solutions.net

JavaBean Models, Command Bean and J2EE Design Pattern

Hello,
I have read the available "How To", Using EJBs in Web Dynpro Applications where the author mentions that one should use a Command Bean (according to J2EE Design Patterns) so that one can invoke business methods in a Session Bean from our Web Dynpro Application. Well, although, I have read some available articles in the internet about J2EE design patterns, I still have some questions about command beans and its usage in Web Dynpro applications.
I have developed a WD App which uses EJBs to read data from the DB.
Let's suppose I only have two tables: BOOKS and AUTHORS.
Lets also suppose I have to Entity Beans (one for each table) and a Session Bean with two methods: Book[] getAllBooks() and Author[] getAllAuthors();
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Or instead should I design two Command Beans, one for each call?
In the last case do the methods must be named execute or can I name them whatever I want?
Furthermore, how should I store the data in my command bean? In instance variables?
If so, can I use array of a class representing a record in the database table (for instance, classes Book and Author) or do I have to store the data in a generic collection (such as ArrayList for instance)?
I ask this last question because if I try to store the data in an array when I am importing the Command Bean as a JavaBean model I always get an error.
One last question: Can the Command Bean execute method directly return the data or should I always store the data in an instance variable an then get it using getter methods?
I know this questions are more about J2EE Design Patterns and JavaBeans specification than they are about Web Dynpro but I also have doubts about the rules that the command bean must obey in order to accomplish a successful JavaBean model import in WD.
Some guidance or tips would be highly appreciated.
King Regards

I have the same problem.
Does anyone know the solution?
Thanks
Davide

Using Complex Data Types in Import JavaBean Model

Hi,
I have searched and read forums and weblogs related to import javabean model.
But I am not clear about how to use complex data types like ArrayList, Collection etc in my java bean.
If I use these complex datatypes in my bean, when creating model in WDF it displays the Complex data elements in Model Relation. I dont know how to use this model relation in my WD project.
Anyone please explain the step by step solution about using complex data type(used in Bean) in WD Project.
Thanks,
Krishna Kumar

Hi Krishna,
Valery`s blog contains sample code ( http://www.jroller.com/resources/s/silaev/Employees.zip )
Another blogs from this area:
/people/anilkumar.vippagunta2/blog/2005/09/02/java-bean-model-importer-in-web-dynpro
/people/valery.silaev/blog/2005/08/30/javabean-model-import-when-it-really-works
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Best regards, Maksim Rashchynski.

How to add field length constraints when using an existing JavaBean model

Within our current project we used a O/R mapping tool to generate our JavaBean model. For e.g.
public class Person{
private String name; ...getName() ...setName(...)
}
The whole model is used within our Web Dynpro project. Now it's a requirement to implement field length constraints. Normally this is no problem using ISimpleType like the following:
attributeInfo = wdContext.nodePerson().getNodeInfo().getAttribute
(IPrivate...IPersonElement.NAME);
ISimpleTypeModifiable type = attributeInfo.getModifiableSimpleType();
type.setLength(60);
But we've got an runtime exception that it is not allowed to modify the models datatype:
com.sap.tc.webdynpro.progmodel.context.ContextException: AttributeInfo
(Basics.Person.name): must not modify the datatype of a mapped attribute
at
com.sap.tc.webdynpro.progmodel.context.AttributeInfo.getModifiableSimpleType
(AttributeInfo.java:337)
The question is how could a workaround look like. Or is there nothing like that and we have to build a dictionary type tier upon our JavaBean model. Any ideas ?
thx,
s.w.

Sabine,
You may:
1. Import JavaBeans model
2. Create DDIC type with necessary constarints (string-based, max. length 60)
3. Open editor for target model class and change type of property.
See my blog /people/valery.silaev/blog/2005/06/29/apojo--almostplain-old-java-objects-as-model (section "Tweaking model classes") for details.
Valery Silaev
EPAM Systems
http://www.NetWeaverTeam.com

Importing Complex JavaBean model into WebDynpro

Hi,
I am trying to get Data from the EJB, in my Case, Command Bean to WebDynpro.
So i followed this thread:
<a href="/people/balaramnaidu.bankuru/blog/2006/04/23/importing-complex-javabean-model-into-webdynpro-by-creating-relationships-for-the-model-classes in WebDynpro</a>
But one thing does't work here:
I can't import the Complex type java.util.Collection.
But i need to get Data from a DB-View into my WebDynpro.
Is there any other chance to do that?
Here a CodeSnippet from my Command Bean Class:
public BusinessDelegate() throws CreateException
 try
 Context ctx = new InitialContext();
 OracleSessionLocalHome home = (OracleSessionLocalHome)ctx.lookup("localejbs/OracleSessionBean");
 session = home.create();
 } catch (Exception e)
 e.printStackTrace();
 public void getAllOracleDetails()
 try
 OracleDTO helper[] = session.getOracleData();
 oracleDetailsList = new ArrayList();
 for (int i = 0; i < helper.length; i++)
 oracleDetailsList.add(helper(i));
 } catch (Exception e)
 e.printStackTrace();
OracleDTO is my HelperClass, where i made all Variable-Declarations I need in the View.
Any ideas?
Would appreciate that!
Bernd

You are not unable to import collection type means u are not able to see that variable in attribute list while importing the model?
This may be due to you have not added getter and setter function for that collection type.

Add new JavaBean Model

Hello Everybody,
In my Web Dynpro project I have imported a JavaBean model (including relations and
the associated helper classes). Now, I want to create a new JavaBean model in the same project and also use some of the model classes from the previous model to define the
relations belonging to the new model. I tried importing the new JavaBean model with the
same helper classes, but that is some how not possible (Error :"Model class already exists") . On the other hand, if I do not include the helper classes, the previously imported
model class are not available in the new model - so how do I define the relations?
Thanks for the feedback.

A.H.,
This is a limitation of WebDynpro JavaBean model wizard -- you may not use same JavaBean more then in one model.
The only possible but unsupported workaround is to create your *.wdmodel file manually using text/xml editor, then reload project and get new model. It's better to start with new model without same beans, then copy necessary lines from "old" model.
Valery Silaev
SaM Solutions
http://www.sam-solutions.net

Updating JavaBean model to reflect changes in classes

I have a Model that was created from a bean using the JavaBean Model import utility. Everything works great...
My question is how do I update this model as I add beans to the jar file? Do I have to delete and recreate the model again each time?

Hi Tom,
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With Regards
Naidu

J2EE-EJB-Deploying an Enterprise JavaBean-deployment failure

I am unable to deploy a simple EJB application . I am using j2skee1.3.1 and J2SDK1.4.0
The related files and error messages are reproduced.
The java files and ear files are in d:\myjava\ejb
class path is .;d:\j2sdkee1.3.1\lib\j2ee.jar;D:\forte_jdk\j2sdk1.4.0\lib;d:\myjava
j2ee_home= d:\j2sdkee1.3.1
java_home=D:\forte_jdk\j2sdk1.4.0
path=%SYSTEMROOT%;%SYSTEMROOT%\command;c:;d:\j2sdkee1.3.1\bin;%SYSTEMROOT%\system32;%SYSTEMROOT%\system32\WBEM;C:\Program Files\Common Files\Adaptec Shared\System;D:\forte_jdk\j2sdk1.4.0\bin;d\j2sdkee1.3.1\javaservlets;d:\MSSQL7\BINN;D:\forte_jdk\j2sdk1.4.0\bdk1_1\beans\beanbox
Can any one suggest a solution.
************calculatorHome**********
import java.io.Serializable;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
public interface calculatorHome extends EJBHome
 calculator create() throws RemoteException, CreateException;
************calculator***************
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
public interface calculator extends EJBObject
 public double dollorToRs (double dollars) throws RemoteException;
**********calculatorEJB***********************
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class calculatorEJB implements SessionBean
 public double dollarToRs (double dollars)
 return dollars * 48.15;
 public calculatorEJB() {}
 public void ejbCreate() {}
 public void ejbRemove() {}
 public void ejbActivate() {}
 public void ejbPassivate() {}
 public void setSessionContext (SessionContext sc) {}
***********************************descriptor*************
<?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'>
<ejb-jar>
<display-name>newcalculatorjar</display-name>
<enterprise-beans>
<session>
<display-name>calculatorEJB</display-name>
<ejb-name>calculatorEJB</ejb-name>
<home>calculatorHome</home>
<remote>calculator</remote>
<ejb-class>calculatorEJB</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
<security-identity>
<description></description>
<use-caller-identity></use-caller-identity>
</security-identity>
</session>
</enterprise-beans>
</ejb-jar>
***************************error message*****
<?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'>
<ejb-jar>
<display-name>newcalculatorjar</display-name>
<enterprise-beans>
<session>
<display-name>calculatorEJB</display-name>
<ejb-name>calculatorEJB</ejb-name>
<home>calculatorHome</home>
<remote>calculator</remote>
<ejb-class>calculatorEJB</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
<security-identity>
<description></description>
<use-caller-identity></use-caller-identity>
</security-identity>
</session>
</enterprise-beans>
</ejb-jar>
STATIC VERIFICATION RESULTS
 NUMBER OF FAILURES/WARNINGS/ERRORS
 # of Failures : 3
# of Warnings : 0
 # of Errors : 0
 RESULTS FOR EJB-RELATED TESTS
 FAILED TESTS :
 Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodArgs
 Test Assertion : Remote interface business methods have matching method arguments test
 Test Description : For [ calculatorEJB ]
For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching arguments was found for method [ dollorToRs ].
 Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodException
 Test Assertion : Remote interface business methods have matching method exceptions test
 Test Description : For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching exceptions was found for method [ dollorToRs ].
 Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodReturn
 Test Assertion : Remote interface business methods have matching method return type test
 Test Description : For [ calculatorEJB ]
For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching return type was found for method [ dollorToRs ].
Thanks in advance.
Nagarajan

In EJB home you have -
public double dollorToRs (double dollars) throwsIn EJB you have -
 public double dollarToRs (double dollars)There is a spelling difference in the function name

Enterprise Data Model

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Subir Didwania

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