Database access design using java bean

Hi,
I am writing a JSP/servlet/Javabean based app. using MVC architecture.The database related logic is in java beans.
I want a generalized class/bean that can form a connection , execute the passed query and return the results.Does any one has any URLs or sample code to explain how to do this using introspection?
I would greatly appreciate any help as this design is very crucial for our application.
Thanks -
k

Please check the Cameleon Open Source project at http://www.must.de/cameleon.html if ti fits your needs.

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Using java bean with jsp

hello friends,
i'm new to jsp. i want to create an html form that accepts username and a value from four radio buttons and display back the entered name and checked radio button's value using java bean.
i use the <jsp:setProperty id="" property="*"> method. i don't know how to access the radio buttons value from the html.
also when i use an additional field other than username the jsp page is showing error.
Please give me the correct method to use java bean with jsp in this circumstance.
thank you.

thank you, but i have a problem left. the case is like this.
i got the jsp and bean worked fine when i have a sinle input text field.
but when i added a second text field i recieved the following error.
javax.servlet.ServletException: basket.newbean.getUserPass()Ljava/lang/String;
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
     org.apache.jsp.newform.process_jsp._jspService(process_jsp.java:69)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
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     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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where userPass is the new form element. I have made the subsequent chanes in my bean program and jsp file.
pls hlp.

How can I using java bean to insert new record

Hi everybody,
I'd some problem when I insert a record using java bean. When insert a record, the resultset executeUpdate return 0 anc cannot add record to database. Would you please tell me what's wrong in my code?
java bean
package miniproj;
import java.sql.*;
public class Register{
private String sql;
private String username;
private String usertype;
private String password;
private String blocknum;
private int floornum;
private String owner;
private int rows;
private String s;
// set parameter to database
public int setMember(){
try{
//load database driver
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// Get a connection to the database
Connection sqlConn = java.sql.DriverManager.getConnection("jdbc.odbc:WFBS");
// Get a statement from the connection
Statement sqlStmt = sqlConn.createStatement();
sql = "INSERT INTO USERS(user_name, password) VALEUS ('aaa', 'aaa')";
// sql = "INSERT INTO USERS(user_name, password) VALEUS (" + user_name + "," + password + ")" ;
rows = sqlStmt.executeUpdate(sql);
// sqlRst.close();
sqlStmt.close();
sqlConn.close();
catch(SQLException se){
catch(Exception e){
return rows;
// set user name method
public void setUsername(String name){
username = name;
// set passwrod method
public void setPassword(String pwd){
password = pwd;
// set block num mehtod
public void setBlockNum(String block){
blocknum = block;
// set floor num method
public void setFloorNum(int floor){
floornum = floor;
// set owner method
public void setOnwer(String own){
owner = own;
// get user name method
public String getUsername(){
return username;
// get password method
public String getPassword(){
return password;
jsp code
<%@ include file="Header.jsp" %>
<%@ page errorPage="Error.jsp" %>
<jsp:useBean id="register" class="miniproj.Register" />
<jsp:setProperty name="register" property="*" />
User name : <%=register.getUsername()%><br>
Password : <%=register.getPassword()%><br>
<%
int i = register.setMember();
out.println(i);
%>
Thanks a lot
Chris

Seems to me that executeUpdate() would throw an SQLException, which in turn would get caught by your empty catch. The SQL keyword VALUES is misspelled. Put a 'se.printStackTrace()' in your catch to confirm this.

Search in form by using java bean or PJC.

hi all
i am confused because i do not know java bean to much,is it possible to create a search button with one text item in java bean to display all records
example:
if i enter dept 10 then it display all records related to dept 10?
is it possible?
if yes please cany anyone send me a demo?
here is my email add.
[email protected]
sarah

hi
Francois thanks for the link and its very useful and i am studying the codes and also i downloaded demos and run them its working fine and its very very nice.
i like java and trying to learn and its very useful.
why i want to use java bean because one of my friend her name is sheela she wants me to do it but i am failed i did not do it in java bean
so i thought lets try on the forum may be someone help u.
so i posted a thread over here.
thanks Francois.
u r appreciated.once again thanks.
sarah

Why use Java Beans?

Why should we use java beans?
Everybody says it is used to set the properties. What does this mean?
Can anyone give me a realtime scenario of the problems it can solve?
How does Spring framework utilize beans to solve problems? i.e wiring beans, declaring them in context file.

shalearns wrote:
Why should we use java beans?[http://java.sun.com/docs/books/tutorial/javabeans/index.html]
Everybody says it is used to set the properties. What does this mean?[http://java.sun.com/docs/books/tutorial/javabeans/whatis/index.html]
Can anyone give me a realtime scenario of the problems it can solve?[http://java.sun.com/docs/books/tutorial/javabeans/nb/index.html]
How does Spring framework utilize beans to solve problems? i.e wiring beans, declaring them in context file.[http://static.springframework.org/spring/docs/1.2.x/reference/beans.html]
~

How to use Java Beans In JSTL?

Hi
I want to know how to use Java bean in JSTL
please explain this with giving any one example.
Thanks-
Swapneel

A bean is obtain by <jsp:useBean> tag nd once bean is obtained we can get its property by using getProperty tag.

Help : Unable to use Java Beans in Oracle forms 6i

Hi ,
I have been trying to run few sample code to understand how to use Java beans in oracle forms 6i .But have been largely unsuccessfull.
It will be great if somebody can provide me with some simple form( and java code )which uses java beans concept to give some data to the java program and receive some data from it . Pls inform me about the settings that need to be done.
If you guys know it then pls take the pains of writing a simple form and java code.
i hope somebody will respond because your reply is very necesary for me to proceed.
U can email me the code > [email protected]
Thanks in advance.

Thanks for your reply Francois.
Actually i am not facing problem understanding the programming technique.
I think the problem at my end is more of a cofiguration one.I am using forms version 6i
on oracle 8.
Every time i set the imlementation class property of the bean area it gives an error 13010 which translates to that "the class being mentioned is not extending the IView class".
The class i have written extends VBean so i am not sure why this error is occuring.
I think if oracle (correctly) finds the java class to use then i will be able to proceed.
Pls reply.
If you have some code that is working fine then pls send it to me.And also inform is some environment variables have to be set for its use.

Query regarding database access segregation using os authentication in windows environment

Hi ,
I have a query regarding database access segragation using os authentication (like sqlplus "/ as sysdba") in windows environment.Let me briefly explain my requirement:-
Suppose you have two DBA`s viz DBA1 and DBA2 and 4 databases resideds in a windows server say A,B,C & D.Now I want to set up such a way if DBA1 logs into the server then he can login to database A and B only using OS authentication and DBA2 can login to database C and D only using OS authentication.
Please let me know how to do setup for this requirement.
Database version is 11.2.0.3

1494629, I am not a Windows person but if there is any way to do this I suspect some additional information is necessary:
Are the DBA users members of the Administrators Group ?
Do all 4 database share the same $ORACLE_HOME ?
I suspect if either answer above is yes then this is not possible, but like I said I am not a Windows person. I would just ask for two servers and the associated licensing to be acquired. The requirement to spend money to do something management wants usually elimanates the request in my world.
HTH -- Mark D Powell --

Getting error: E_ADEPT_DISTRIBUTOR_AUTH while access ACS4 using java

Hello Everyone,
Thanks for ur time. I am new to ACS4.
I am trying to access ACS4 using java code and view the response for ALL ITEMS.
Below is the code that i created using UploadTest reference.
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But after executing this code from my desktop, i am getting the below error response:
<error xmlns="http://ns.adobe.com/adept" data="E_ADEPT_DISTRIBUTOR_AUTH http://xxx.xxxxxxx.com:8080/admin/ManageResourceItem urn:uuid:00000000-0000-0000-0000-000000000001"/>
Please help me to figure out the error.
Thanks
Rupal Chatterjee

Are you sure you are signing the URL/.acsm file correctly for those particular books?

Value cannot refresh using Java bean

When I use java bean to get a value. It suppose to refresh and show new value but it doesn't. So any code can help to resolve this issue.
here is my code
(Testing.jsp)
<html>
<head>
<title>Page 3</title>
<link rel=stylesheet type="text/css" href="auction.css">
</head>
<table class="mainBox" width="200">
<tr><td class="boxTitle" >
Testing number 3
</td></tr>
<tr><td>
<span class="headline">
     <jsp:useBean id="testing2" class="com.jsp.newsys.testing.Testing2" scope="request">
     <jsp:setProperty name="testing2" property="user" value="Hello World"/>
<jsp:getProperty name="testing2" property="user2"/>
     </jsp:useBean>
</span>
</td></tr>
</table>
</html>
The bean file which is Testing2.java
package com.jsp.newsys.testing;
import java.beans.*;
import java.util.*;
public class Testing2 extends Object implements java.io.Serializable {
     private String user;
     private String test;
public Testing2() {
public void setUser(String user)
          test="";
          if (user.equals("Hello World"))
               test="Hi dqwqwd";
     public String getUser2()
     return this.test;
I need to restart my tomcat everytime then only the value will refresh. Please help.
Message was edited by:
wesleygch
Message was edited by:
wesleygch
Message was edited by:
wesleygch

Your bean maybe have misspelling error
look at test and test2 on the jsp file. But I couldn't find any bean property test2 in your bean. Maybe you should try
${testing2.test} instead of ${testing2.test2}
I am a new bie also....:-)

Using Java Bean in JSP to show database record

I have links in my Tomcat container that if someone clicks on a specific link it should go to a Record page (Show.jsp) with all the values associated with a record from a database.
For example if someone clicks on a specific link like this:
LinkExample
it would take you to a jsp with database info for someone named Jones and show you his info:
Lastname = Jones
Firstname = Mike
City = San Diego
I would like to do this using a Java helper class and bean so I dont have any database connection or Java code in my JSP.
I created Java class file that has Database connection that works with a Java bean. I just dont know how to get the Show.jsp to work with the Java Bean and Java helper class file.
Here is what I have for Show.jsp and this is the part I have been working on the longest but cant get it to work because it doesnt seem to work with the database:<jsp:useBean id="user" class="num.UserDB"/>
//do I call getUser(lastname) here and if so how?
<jsp:setProperty name="user" property="*"/>
Last Name: <jsp:getProperty name="user" property="lastname"/><BR>
First Name: <jsp:getProperty name="user" property="firstname"/><BR>
City: <jsp:getProperty name="user" property="city"/><BR>My Java Helper class that compiles and connects to database:
package num;
import java.io.*;
import java.sql.*;
import java.util.*;
import num.User;
public class UserDB
public User getUser(String lastname)
User user = new User();
        try
     Class.forName...//database connection stuff here
    ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
     if(results.next() == true)
     results.next();
     user.setLastname(results.getString("lastname"));
     user.setFirstname(results.getString("firstname"));
        user.setFirstname(results.getString("city"));
     catch(Exception e)
               System.out.println("Exception...");
   return user;
}My Java Bean that compiles here:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
     //no arg constructor
public User(String firstname, String lastname, String city)
       this.lastname = lastname;
          this.firstname = firstname;
          this.city = city;
public String getLastname()
          return lastname;
public void setLastname(String lastname)
     this.lastname = lastname;
//more bean methods for all fields here

Sorry if I wasnt specific enough. I have a link that passes a value (field that is passed is called lastname) to a JSP where I want to show record info for that value that is passed.
My question is how do I show the database record info on Show.jsp for the lastname field value of Jones where I want to use a Java Bean and Database helper class in Show.jsp
Here is the message I get when I hit the link (LinkExample) and it goes to Show.jsp:
org.apache.jasper.JasperException: Cannot find any information on property 'lastname' in a bean of type 'num.UserDB'
.....My UserDB class:
public class UserDB
public User getUser(String lastname)
User user = new User();
        try
     Class.forName("org.gjt.mm.mysql.Driver");
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/dbconnone?user=smitherson&password=abcdefg");
    Statement stmt = conn.createStatement();
    ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
     if(results.next() == true)
     results.next();
     user.setLastname(results.getString("lastname"));
     user.setFirstname(results.getString("firstname"));
                     user.city(results.getString("city"));
     catch(Exception e)
         System.out.println("Exception..." + e);
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}Bean class:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
     //no arg constructor
public User(String firstname, String lastname, Sting city)
      this.firstname = firstname;
       this.lastname = lastname;
this.city = city;
public String getFirstname()
          return firstname;
public void setFirstname(String firstname)
     this.firstname = firstname;
public String getLastname()
          return lastname;
public void setLastname(String lastname)
     this.lastname = lastname;
public String getCity()
          return city;
public void setCity(String city)
     this.city = city;

Crystal Reports data connection using Java beans

Hi
My name is Bach Ong, i'm currently perform re-configuring Crystal reports 2008 to connect via
Java bean to Jboss server, this uses look up service on JBoss server. The connection is using Connect
look up using the properties:
java.naming.provider.url=jnp://emgsydapp121:10499
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
for file CRConfig.xml i put as follows:
<JDBCURL></JDBCURL>
<JDBCClassName></JDBCClassName>
<JDBCUserName></JDBCUserName>
<JNDIURL>jnp://emgsydapp121:10499</JNDIURL>
<JNDIConnectionFactory>org.jnp.interfaces.NamingContextFactor
y</JNDIConnectionFactory>
<JNDIInitContext>/</JNDIInitContext>
<JNDIUserName></JNDIUserName>
Can you advise us if this step is correct, and is there any
documentation that can guide us to right direction.
for Java testing in Eclipse using remote call class it is working suing the following code:
        Properties p = new Properties();
        p.put(Context.INITIAL_CONTEXT_FACTORY,
        "org.jnp.interfaces.NamingContextFactory");
        p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
        p.put(Context.PROVIDER_URL, "jnp://emgsydapp121:10499");
         InitialContext ctx = new InitialContext(p);
Date asAtDate = CrystalUtils.convertToDate("2014-01-01", CrystalUtils.relativeToToday(0), false);
     String asxCode = "BHP";
     ClosingPricesReportRequest criteria = new ClosingPricesReportRequest(asAtDate, asxCode);
     InitialContext context = new InitialContext(p);
     ClosingPricesReportService ejb = (ClosingPricesReportService) context.lookup(ClosingPricesReportService.REMOTE_JNDI);
     ClosingPricesReport report = ejb.createMTMClosingPriceReport(criteria);
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     System.out.println(testval);
when i run the tes code the results as follow:
10:49:45,244 DEBUG [SecurityAssociation ] Using ThreadLocal: false
10:49:45,338 DEBUG [MicroSocketClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] constructed
10:49:45,338 DEBUG [MicroRemoteClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] connecting
10:49:45,338 DEBUG [MicroSocketClientInvoker ] Creating semaphore with size 50
10:49:45,338 DEBUG [MicroRemoteClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] connected
10:49:45,369 DEBUG [ClientSocketWrapper ] reset timeout: 0
10:49:45,650 DEBUG [InvokerRegistry ] removed SocketClientInvoker[709446e4, socket://emgsydapp121:10473] from registry
10:49:45,650 DEBUG [MicroSocketClientInvoker ] SocketClientInvoker[709446e4, socket://emgsydapp121:10473] disconnecting ...
10:49:45,650 DEBUG [SocketWrapper ] ClientSocketWrapper[Socket[addr=/10.137.2.40,port=10473,localport=64150].2cba5bdb] closing
37.99000000000000198951966012828052043914794921875
37.99000000000000198951966012828052043914794921875
Can anyone assist me in convert the above settings to get access by Crystal reports.
My attemp current are below:
public class CFDClosingPricesRpt extends CrystalReport {
    //Constructor
    public CFDClosingPricesRpt(){
        super(ClosingPriceBean.INSTANCE);
     * Returns the ResultSet for this report to Crystal.
     * @param asxCode
     * @param asAtDateString
     * @return
public ResultSet getNewReport(String asxCode, String asAtDateString) {
     try {
         Properties p = new Properties();
         p.put(Context.INITIAL_CONTEXT_FACTORY,
         "org.jnp.interfaces.NamingContextFactory");
         p.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");
         p.put(Context.PROVIDER_URL, "jnp://emgsydapp121:10499");
         //InitialContext ctx = new InitialContext(p);
         clearCachedReportBeans();
   Date asAtDate = CrystalUtils.convertToDate("2013-01-01", CrystalUtils.relativeToToday(0), false);
      asxCode = "BHP";
      ClosingPricesReportRequest criteria = new ClosingPricesReportRequest(asAtDate, asxCode);
      //ClosingPricesReportService ejb = (ClosingPricesReportService) ctx.lookup(ClosingPricesReportService.REMOTE_JNDI);
      ClosingPricesReportService ejb = (ClosingPricesReportService) ServiceLocator.getInstance().getService(ClosingPricesReportService.REMOTE_JNDI);
      ClosingPricesReport report = ejb.createClosingPriceReport(criteria);
      // assemble Crystal-friendly DTO
      Collection closingPrices = Arrays.asList(report.getClosingPrices());
      for (Iterator iter = closingPrices.iterator(); iter.hasNext();) {
                MBLXClosingPrice cp = (MBLXClosingPrice) iter.next();
                if (cp==null) continue;
                addReportBean(new ClosingPriceBean( report.getSuppliedDate(),
                            cp.getClosingPrice(),
                            cp.getAsxCode()));
} catch (Throwable x) {
      saveErrorMessage(x);
return getAsResultSet();
Thanks
Bach Ong

Hi Don Thanks for the reply.
I've was able to connect via Java beans and JNDI. But this one is going the JNDI of JBoss sever, which the JNDI already configure and working for Crystal reports v10.
Bach

Problem of accesing MS Acess database on Linux using Java

Below is my java code and errors found. Can anyone guide me tell me what is the problem and how to success access the .mdb file using Java on Linux?
import java.sql.*;
class readmdb
{      public static void main(String[] args)
{    String url;
Connection con;
Statement stmt;
try
{     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(java.lang.ClassNotFoundException e)
{    System.out.print("ClassNotFoundException: ");
System.out.println(e.getMessage());
try
{     con = DriverManager.getConnection("jdbc:odbc:DRIVER={/usr/local/lib/libmdbodbc.o.O}};DBQ=/home/powerstation/db/Database.mdb");
stmt = con.createStatement();
stmt.close();
con.close();
catch(SQLException ex)
{ System.err.println("SQLException: " + ex.getMessage());
Errors messages found after i executed the java code
shown above on linux platform.
Exception in thread "main"
java.lang.NullPointerException
at sun.jdbc.odbc.JdbcOdbcDriver.initialize(JdbcOdbcDriver.java:436)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(JdbcOdbcDriver.java:153)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
atjava.sql.DriverManager.getConnection(DriverManager.java:193)
at readmdb.main(readmdb.java:27)

jschell,
ODBC shell is the odbc.ini or odbcinst.ini? No.
The shell is something that you explicitly installed. Just like you installed Apache, or perl, or a C++ compiler, or even a CD driver.
If yes,
What is the difference between odbc.in and
odbcinst.ini? No idea. But on a windows box those are ini files that specify odbc info. I don't think ini files are going to help on linux.
Which of them will be execute when i
want to establish a connection using "jdbc:odbc:...."
in DriverManager.getConnection?I am rather sure that neither of them would 'execute'
>
Is it MS Access ODBC linux driver is the file like
libodbc.so, libmdbodbc.so, libmdbsql.so and so on?No idea, but I doubt it.
What makes you think that you even have a MS Access ODBC linux driver on your box?
Then, can u tell me which is MS Access ODBC linux
driver or what is the driver file name for MS Access
ODBC linux driver?Nope.
If you installed a MS Access ODBC linux driver, then the ODBC shell will know where it is.
And if you did install such a driver you should post the link where you got it here, because as far as I know, there is no such driver (nor is there one for MS SQL Server.)

Database access tool for Java Development

Hi,
A couple of days back, our SAP's database (MSSQL) was corrupted and downed the Java Stack.
During the Java development, normally after a newly created table was deployed via Java Dictionary, Java developer will access the database via the MSSQL Enterprise Manager to view/delete/update data. Unlike the ABAP development, all database access was done via SE16 in SAPGUI. It was believed that the Java Development kind of direct access to the database via the MSSQL Enterprise Manager was causing some MSSQL tables to be corrupted, and thus downed the Java Stack.
1. Is there any tool like SE16 to access database during the Java Development?
2. If no, what kind of recommendation/tool to access database for Java Development?
Any help would be much appreciated. Thanks.
julius

Julius,
There are no industry recommended open source DB tools.
Normally it depends upon the developer preferences that how he/she wants to see the tool usability.
I can suggest you to go through the below link:
http://sourceforge.net/search/?type_of_search=soft&words=SQL+Tools
You can find many open source SQL tools, which you have to test and select one among them.
I can suggest you to use:
1) TOra
2) Easy SQL
3) SQuirrel
"Choose a Tool which is easy to use and efficient, Dont worry about Look n Feel"
Best of Luck

Upload to Excel using Java Bean

Hi
My requirement is that to upload the data to an excel sheet from a JTable(JTable is actually a java bean which gets its input from forms) and the user need to be given either to view the excel/save the excel/print the excel in any of the networked printers.
Please cud someone help me with their inputs.
Thanks again
Deepa

can you send me your code bean and form?
I have example that i can send you to export to excel using webutil and OLE object.

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