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

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Import JavaBean Error : Invalid Class

previously , i have 3 commandbean class , after that i add another 2 commandbean class,
i hit the following error,
Invalid Class -JavaBean not available for import class
:net/solutions/model/ExternalToGateway
Jar: c:\documents and settings\yzme\sap\workspace\SmsGatewaywebdynpro\lib\SmsGatewayCommandBean.jar
Message was edited by:
yzme yzme
Message was edited by:
yzme yzme

Hi yzme yzme,
These problems occur when you are not following the specification for the java Beans that the netweaver platform expects:
Please check the following for eradicating the error:
1. Is there a setter which doe'snt have a consequent getter for the variable.If so provide it because its considered mandatory from the bean Specs.
2.If you have used your own methods for fetching and setting the value rather then using the getter setter for the same this will give a generational error on import.
Above listed mistakes are made by developers ona regular basis. Please go through the java bean specs on sun.java.com for more details
Regards
Amit
Allocate points if found Helpful.

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.

INVALID CLASS:model_cmd_bean as model class already exists.

Hello all,
I am gettin the following error:INVALID CLASS:model_cmd_bean as model class already exists. while creating a java bean Model.
but this is the 1st time i m using these wraper class and cmd class for creating a model.
Sugest what shoul i do?

Hi,
Welcome to SDN Community
Check these forum links,
Import JavaBean Error : Invalid Class
invalid class - ..as Model Class already exist
Hope this helps.
Regards
Srinivasan T

Invalid Class -Java Bean not available for import

hai friends,
i have declared the bean but unable to import into webdynpro application
i am geting the error invalid Class-java bean Not available for improt
i am try for this since more than 10 days , i get the same error
even i thought there may be issues with nwds , i have installed thrice.
there is application download from the sdn tu_bonus calculation it is working
plz help me neede very urgently

Hi,
Go thro' these solved threads dealing with similar type of problem,
Import JavaBean Error : Invalid Class
invalid class - ..as Model Class already exist
Hope it helps to fix the error !
Regards
Srinivasan T

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

Invalid class: Javabean not available for import

hi all,
I have developed a very simple javabean in my WDJ DC in folder src/packages like this:
package test.beans;
public class TreeBean {
     private String name;
      * @return
     public String getName() {
          return name;
      * @param string
     public void setName(String string) {
          name = string;
however when I try to import that into a model in NWDS 7.0.11, I get Invalid class: javabean not available for import.
When I try to do the same in NWDS7.1SP5 it succeeds.
What's wrong?
Thanks for your help
Vincenzo

Rebuild and reload the DC/project

'invalid class-java beans not available for import

Hi Experts,
i am using java bean model in my Web Dynpro Application.
for that one i have created command bean(Customer) and in my command bean i am using some other class(CustomerInfo) as reference. this CustomerInfo class contains 4 attribtes(name ,id ,etc all are of type String)
when i try to import these 2 class into web dynpro (using java bean model),for the Customer class it
is giving an error message 'invalid class-java beans not
available for import'.but 2nd class(CustomerInfo) is imported successfully with out giving the error.what might be reason.
any help will be appriciated
Thanks in advance
With Regards
Naidu

Naidu,
Please try to repeat JavaBean model import when running IDE in console mode (correspondign short-cut should be available in Windows Start menu, otherwise just copy original short-cut, edit it and change in command string "javaw" to java).
Post here what is shown on console during import.
VS

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.

JavaBeans Model Import

Hi all,
Could someone explain requirements for JavaBeans Model Import introduced since SP9?
For me wizard rejects even plain empty classes or classes with single String property
Do I need to define some documentation tags as with XMI model???
Thanks in advance,
VS

Thanks, Karin
I get several steps further.
However, after resolving relations and clicking finish I get the following error in NW log (and nothing is imported, of course):
!MESSAGE Nov 15, 2004 5:55:46 PM          com.sap.ide.webdynpro.ui.service.ServicesUI          [
Thread[ModalContext,5,main]] Error: Internal error
   Plugin name: Web Dynpro Model Editor Services
   Plugin ID : com.sap.ide.webdynpro.service.modeleditor
   Class      : com.sap.ide.webdynpro.service.modeleditor.ModelService
   Method     : doImportJavaBeanModel()
   Message    : Failed to create model .com[/code]
See line in bold -- wizard does not add dot (".") when concatanating package name and model name (or it is just error in logging itself???)
Regards,
VS

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,
if you mean reimporting of Java Bean Model,it's available with latest release of J2EE stack.if u are woring on 6.4,u have to delete the existing model and recreate it.
With Regards
Naidu

How to add a javabean Model to a web dynpro Project

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.
The problem comes when I want to duplicate the development but using a DC Web Dynpro Project. I have re-develop every step of the tutorial but using DC projects:
DC diccionary project, DC ejb project, DC enterprise application project & DC java project.
But now I DO NOT KNOW the steps for importing the development into a model for DC Web Dynpro.
Anyhelp will be very appreciated, thanks in advance-

Thanks Jhansi,
Yes, you are right. I had already followed those steps. The error comes when I have to select between the JavaBean Source:
1. project (source folder) (checkbox)
2. public parts of used DC's (combobox)
I have been trying both, the second one by copying first the JAR called CommandBean.jar of my DC Java Project with dependencies to EJB project into the web dynpro "lib" folder, and then selecting the new entry CommandBean.jar from that combobox.
then i get de following error: "Invalid JAR - No JavaBeans available for import"
So I do not know how to use any of these two options for java source.
Thanks.

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();
I also have a Command Bean which I imported in my WD App.
My questions are:
How should I design my Command Bean?
Can I have only one Command Bean with two methods each calling one of the methods of the Session Bean?
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

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:
The business functions are provided in the form of an Enterprise JavaBean (EJB) application where the business logic is implemented through a stateless session bean and the persistence through a CMP-based entity bean.
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.

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

Import JavaBean Model - Invalid class

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