Entity java beans (important )(urgent)

The question here is that i have bean hearing and reading that the entity beans are used for database acces mechanismms and are used in scenarios where persistence is required ........but i didnt get he idea that if a 10000 big number f cliens are supposed to have acces to there indivisual back acounts that are implemented using the entity bean .....then how would the bean avoid the bottleneck situataion ......
kindly reply to this with whatever u have in your in mind , even a little word from your side will be appreciated and it might help me getting out
THANX.

There are many variables.
1. Container (connection pool?)
2. Server (memory?, cluster?)
3. Network
4. Database
5. Multiplicity
6. Implementation

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Java Bean Importer

Hi
I am trying to import a Java bean into webdynpro component. I have exposed the Java bean class as public part and I am using this as a used DC in webdynpro.
I am trying to create a model from Java bean importer and i select the Jar of the java bean I am getting the following error.
java.lang.Exception: Invalid Class - JavaBean not available for import
Class :javax/ejb/CreateException
Jar :C:\Documents and Settings\Administrator\.dtc\1\DCs\ibm.com\jdidemo\maint\java\_comp\gen\default\public\CommandBean\lib\java\comjdidemomaintjavaCommandBean.jar
at com.sap.ide.metamodel.importers.javabean.JavaBeanAnalyser.identifyClassesForJar(JavaBeanAnalyser.java:1187)
Any help is appreciated.
Regards
NagaKishore V

Hi,
please check the steps to be implemented to import the Jave Bean.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c
Please refer the blog as well.
/people/valery.silaev/blog/2005/08/30/javabean-model-import-when-it-really-works
hope that helps.
Regards,
S.Divakar
Message was edited by: Divakar Salla

What are Java Beans?

Can someone tell me what they do please?
Saple codes might help too

Here's a simple Java Bean:
import java.io.Serializable;
public class SampleBean implements Serializable
    private static final String DEFAULT_MESSAGE = "Do a Google search on 'Java Beans next time'";
    private String message;
    public SampleBean() { this(DEFAULT_MESSAGE); }
    public SampleBean(final String message) { this.message = message; }
    public String getMessage() { return this.message; }
    public void setMessage(final String newMessage) { this.message = newMessage; }
}Do a Google search to learn more. Sun has Java Bean tutorials.

Importing Java Bean Model in Webdynpro Development Component

Hi All,
Is there any simple tutorial, example to import java bean model in webdynpro development component.
I am using NWDS 7.0 SP14 and WAS 7.0.
it really helps if you can provide simple EJB as a development component with details how to create a public part and using this bean as java bean model in Webdynpro development component.
what are the steps to be followed with precautions
Thanks in Advance,
Murali

Hi,
[Using the Java Bean Model in Web Dynpro|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/4072c0d0-c21e-2b10-ab84-e2c183d355de]
[Using EJBs in Web Dynpro|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c]
you will get more if you search in the forum.
more help on EJB's
Re: Help needed in EJB
http://help.sap.com/saphelp_nw70/helpdata/EN/19/f9bc3d8af79633e10000000a11405a/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/70929198-0d36-2b10-04b8-84d90fa3df9c
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1f5f3366-0401-0010-d6b0-e85a49e93a5c
PradeeP

Need urgent help on Java Bean

Can some one help me to find a place for step by step documentation on how to create java bean and load an image thru java Bean on a form. I'm not loading from the same server it must be loaded from a different server.
Very urgent please. I really appreciate any help.
Thanks in advance.

Hi,
for the first part of your question: start Forms Builder, press F1 and the seach for Bean Area. The online help also comes with code examples
for the second part, this URL will give you a head start: http://www.particle.kth.se/~lindsey/JavaCourse/Book/Java/Chapter11/loadingImages.html
Frank

Expose EJB through Java Bean model importer in Web Dynpro

Hi,
I am planning to expose EJB like following:
1. Create Stateless session bean as a façade for DAO access.
2. Create DAO to access database. In my case is Oracle DB
3. Create Java Bean to encapsulate session bean
4. Import java bean model to web dynpro
Few of my business method return the object array e.g. Customer[] which contains all properties of customer, and getter, setter.
Has anyone done this before? Is there any sample code?
Best Regards,
Zhang Yan

Hi
I think u can refer to the following link
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/java/simple java bean generator for database.pdf
Thought this link is also Useful
Creating and Deploying Web Services for an EJB
Wishes
Krishna kanth

Import Java Bean model in Web dynpro DC

Hi all,
I have created the following DC's on a track:
1. EMPDic (Type: Dictionary) - DC that contains the database table.
2. EMPEjb (Type J2EE) - DC that contains the EJBs that have business logic. Created a public part EMPpp that containd the bean classes.
3. EMPEar (Type J2EE) - DC that contains the EMPEjb module.In Used Dcs added EMPpp
4. EMPCmd (Type: Java) - DC that acts as the command bean.
Created 2 public parts 'compile'(Type:compilation) and 'deploy' (Type:assembly). In Used DCs added EMPpp.
5. EMPWd (Type: Webdynpro) - DC that will contain the Java Bean Model and the application. In Used DCs added 'compile' and 'deploy'.
Q1.) Now when i try to import the Java bean model by selecting the radio button "public parts of used DCs" and look at the dropdown, i am not able to see any of the jar's related to my command bean DC.
If i select the radio button "project(source folder)" and click Next it says 'No JavaBeans for import'. Am i missing something?
Q2) Could someone tell me the exact steps from pt. 4 onwards. ie. whether it is necessary to create the 2 public parts for EMPCmd DC and what should it contain.
Thanking you in advance.

Hi Melwyn,
check the NWDI tutorial, it will help you:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/c0b53558-6df6-2910-cfbf-a63316bb0fad
kind regards
Stefanie

Java bean - urgent help

Hi,
I am creating a java bean in a jsp file. I want to pass this bean to a java class in the same jsp file.
eg:
A1.jsp
<jsp:useBean id="customer" class="com.Customer" scope="session"/>
<jsp:setProperty name="customer" property="*"/>
<% Teller teller=new Teller();
int custid=teller.addCustomer("customer");
%>
Teller.java
public class Teller
public int addCustomer(*C*ustomer pcus)
          CustomerDb Cdb=new CustomerDb();
          return Cdb.addCustomer(pcus);
CustomerDb.java
public class CustomerDb{
int customerid;
public int addCustomer(*C*ustomer pcus){
     try{
some code....
When I try to compile Teller.java and CustomerDb.java it is giving error in the lines highlighted with bold.
Please help in this.

Problem Description
You are getting
FRM-40735: WHEN-BUTTON-PRESSED trigger raised unhandled exception ORA-105100.
When you run FileUpload utility
Solution Description
Follow the steps given below to fix and run the FileUpload Bean successfully.
Make sure you have set your System Path similar to following, in the same order:
System PATH:
E:\Dev6i\bin;E:\Dev6i\forms60\java;E:\jdk1.2.2\bin;E:\jdk1.2.2\jre\bin;
E:\jdk1.2.2\jre\bin\classic; %SystemRoot%\system32;%SystemRoot%;
%SystemRoot%\System32\Wbem;C:\Program Files\Oracle\JInitiator1.1.8.16\bin;.
CLASSPATH :
E:\dev6i\forms60\java;E:\dev6i\forms60\java\UploadServer.jar;
E:\jdk1.2.2\jre\bin\classic;E:\jdk1.2.2\jre\lib;E:\Dev6i\TOOLS\COMMON60\JAVA\IMPORTER.JAR;.
Now, Open Form Builder ->Layout Editor->Program menu->Import Java Classes
Check here to make sure that the FileUpload.class is displayed there under
Oracle/forms/demos/uploadclient folder.
Note that the java bean uses the implementation class
file oracle.forms.demos.uploadclient.FileUploader
So, you need to put the FileUploader.class in
<ORACLE_HOME>\FORMS60\java\oracle\forms\demos\uploadclient\FileUploader.class
or you need to change the oracle.forms.demos.uploadclient.FileUploader
in implementation Class property matching to
the class name where you have actually put it.
You need to set archive_jini=f60all_jinit.jar,uploadclient.jar.sig in formsweb.cfg
Open the fileupload.fmb, remove the attached Library.
Open the fileupload.pll from File->Open.
Recompile all the procedure and packages again.
Save this fileupload.pll.
Then reattach this library as a attached library to this form, recompile the form.
This should solve the problem.
If the path is set as explained above solves the PDEUI0001 problem of
Java Importer also.
Explanation
Reason:
This error occurs when the upload button is pressed in the File upload utility
because the attached PLL library is not compiled properly.
Please let me know if this helps.
Regards
Grant Ronald
Forms Product Management

URGENT! Java Bean Query

I am using Tomcat 3.1 and MySQL database for an application I am designing. Below is the code for a java bean that registers users details. The code compiles correctly, but I would like to know if there is any code that I might have left out? What changes should I make to make it more user friendly?
I do not want to use servlets, as they are very difficult to setup.
REGISTRATION.JAVA
package gcd;
import java.sql.*;
import java.util.*;
import java.lang.*;
import java.awt.*;
import java.text.*;
import java.io.*;
import com.mysql.jdbc.*;
public class Registration
     public Registration(){}
String first_name;
String last_name;
String role;
String email;
String error;
java.sql.Connection con;
public void setFirstName( String value )
first_name = value;
public void setLastName( String value )
last_name = value;
public void setRole( String value )
role = value;
public void setEmail( String value )
email = value;
public String getFirstName()
return first_name;
public String getLastName()
     return last_name;
public String getRole()
     return role;
public String getEmail()
     return email;
     public void connect() throws ClassNotFoundException, SQLException, Exception
try
System.setProperty("jdbc.drivers", "com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection("jdbc:mysql://localhost/gcdBB_db","","");
catch (ClassNotFoundException e)
error = "ClassNotFoundException: Could not locate DB driver.";
throw new ClassNotFoundException(error);
catch (SQLException e)
error = "SQLException: Could not connect to database.";
throw new SQLException(error);
catch (Exception e)
error = "Exception: An unknown error occured while connecting to database.";
throw new Exception (error);
     public void disconnect() throws SQLException
try
if(con != null)
con.close();
catch (SQLException e)
error = ("SQLException: Unable to close the database connection.");
throw new SQLException(error);
public java.sql.ResultSet validateRegistration(String firstname, String lastname, String role, String email) throws SQLException, Exception
java.sql.ResultSet rs = null;
try
String queryString = ("INSERT INTO registration (firstname,lastname,role,email) VALUES ('" + firstname + "','" + lastname + "','" + role + "','" + email + "';");
java.sql.Statement stmt = con.createStatement();
rs = stmt.executeQuery(queryString);
catch (SQLException e)
error = "SQLException: Could not execute the query.";
throw new SQLException(error);
catch (Exception e)
error = "An exception occured while retrieving users.";
throw new Exception(error);
return rs;
Thanks,
Niall

in JavaBean class:
The setting/getting method should be matched with the first letter capitalized. ie.
String firstName;
String lastName;
public void setFirstName(String value) { firstName = value ; }
public String getFirstName() { return firstName; }
public void setLastName(String value) { lastName = value ; }
public String getLastName() { return lastName; }
String role and email coded correctly.
remember: put your bean in package and call from package.

Importing java Bean Model

hai ,
am new to webdynpro for java ... Am trying to import ejb bean jar to web dynpro ..
Steps as follows
i) copy the bean jar to wd project lib folder
ii) Set classpath
SampleWD - > Model
Model -> create model
Model name : Samplemodel
Model package : com.sample
Local jar file : C:\sap\workspace\SampleWD\lib\addbean.jar -- getting error in this step as Invalid Class - java bean not available for import
can anybody help me ..
Thanks in advance...
regards,
Krish

Hi Krish,
In addition to Madhu's suggestion,
As per the Java Bean Model creation steps, you will need to add the Commanad Bean JAR too in your Project, and while creation of Model, you need to select this Command Bean JAR and not the Bean Project JAR.
Regards,
Alka.

Importing Java Bean Model (Command Bean) with Session Bean

Hello all,
I'm trying to import a CommandBean as a Java Bean Model in WebDynpro but I'm prompted with an error indicating that I cannot import the EJB (Session Bean) DC that is being accessed by my CommandBean - hence failing to import the CommandBean DC as well.
How do I import this?
Help please.
-Regards,
Jan

HI,
just add ejb20.jar as an external jar in your WD 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

I can not fine the Entity Bean's advantage than Java Bean?

I can not fine the Entity Bean's advantage than Java Bean,
can you tell me, thanks a lot?

I can not fine the Entity Bean's advantage than Java
Bean,
can you tell me, thanks a lot?I think you should read more of the EJB Spec. You'll find your answer there. But mainly with entities you can have the container manage all the lifecyle of the Bean (transactions, caching, creation, etc...). But entities are not only to map columns in the database, they are supposed to have business code. See more by reading the spec.
MSB

Use Java Bean or Java Importer

I have created my java class to validate a user against LDAP and now I would like to use that class in my own 9i login form. In order to pass the class variable values to the form is it better to create a java bean or use the Java Importer? Which is better for performance?

Mike,
Java Beans added to Forms are downloaded to teh client as part of the application startup. The jar files get permanently cached on teh client until they are renewed on the server. For your original request, the funtionality already exists in a Forms9i demo
http://otn.oracle.com/sample_code/products/forms/files/Forms9iOID_DEMO.zip
Viewlet:
http://otn.oracle.com/sample_code/products/forms/demo/9i/forms_services_demos/sso_oid_integration/viewlet/forms_integration_oid/OID90_viewlet.html
To authenticate
<Java Importer class package>.authenticateUser(<obj ORA_JAVA.JOBJECT>,user_dn VARCHAR2,password VARCHAR2) RETURN BOOLEAN;
Frank

What makes a Java Bean invaild for a model import?

I'm busy prototyping some functionality that will expose some MDM 5.5 data through a WebDynpro application. I'm having a problem creating a java bean that will sit in front of an EJB, in that the Bean importer will refuse to import a bean if a certain line of code in a method is visible. Here's the offending code from the method:
try {
     A2iResultSet rs = cat.GetRecordsByValue(ary, rsd, Schema.MyTable.NAME);
     setEventLocation(rs.GetValueAt(0, Schema.MyTable.EVENT_LOCATION).GetStringValue());
} catch (StringException e) {
     setEventLocation("failed to find record");
Note that I have a class instance variable called 'eventLocation', which has get/set methods defined for it, thereby satisfying the Javabean requirement.
The first two lines of the 'try' block are the problem. If I comment them out and assemble the DC, I can import the Bean into a model with no issues. If I uncomment them, I cannot import the bean - I get a message that says 'Invalid Jar - no beans to import'.
Can someone explain why this is happening? Does it have something to do with the StringException? As far as I can tell from the Java bean model import documentation, I think I'm doing everything correctly, but something must be amiss.
Suggestions?

Pablo,
Now I understand your question in comments to my blog better
You have to add "ejb20" classes to your WebDynpro project as well, and import model afterwards.
In WebDynpro DC expand path (<project> -> DC MetData -> DC Definition -> Used DC) and invoke "Add Used DC..." in contextual menu. In dialog select "<dev. config> -> SAP-J2EE -> ejb20 -> DC MetaData -> Public Parts -> default". Set dependencies Built-time (probably Design-time as well). Click OK. Try to import model. If fails, restart IDE and try to import again.
Valery Silaev
EPAM Systems
http://www.NetWeaverTeam.com/

Entity java beans (important )(urgent)

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