Access Context Parameter in Java Bean.

Hi,
I want to access the Context parameter set by the web.xml from a java bean or simple java class. For example, If I have database connection details in my web.xml and I want to get these in a Java Bean of a class which will pick up the values and create a Connection object and return to the guy calling it, either JSP or servlet.
I have a idea of using InitialContext class. But I doubt it works for
Context parameter defined in the web.xml.
It worked if I use like this for DataSource object which is created in my application server.
Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("OMSDataSource");
return ds.DatabaseConnection.getConnection();
So how can I access a parameter like this..
<context-param>
<param-name>Webmaster</param-name>
<param-value>[email protected]</param-value>
</context-param>
Cheers.
L G Goundalkar

Greetings,
Hi,
I want to access the Context parameter set by the web.xml from a java bean or simple java class.The bean doesn't have direct access to the context object so that access must to supplied to it - i.e by calling getServletContext() and passing the resulting reference to the bean.
For example, If I have database connection details in my web.xml and I want to get these in a Java
Bean of a class which will pick up the values and create a Connection object and return to the guy
calling it, either JSP or servlet.Why not write a DAO to handle the JSP or servlet's access needs? The DAO can be initialized at application start with a context listener and the initialized instance placed in the context where the JSP or servlet can get it directly. ;)
I have a idea of using InitialContext class. But I doubt it works for Context parameter defined in the
web.xml.Not for context parameters (a different "space" from the JNDI namespace ;). But, of course, it does work for "environment entries" which may also be placed in the web.xml DD (er, presuming your web container supports JNDI, of course).
Cheers.
L G GoundalkarRegards,
Tony "Vee Schade" Cook

Similar Messages

Need Help-How Store the input parameter through java bean

Hello Sir,
I have a simple Issue but It is not resolve by me i.e input parameter
are not store in Ms-Access.
I store the input parameter through Standard Action <jsp:useBean>.
jsp:useBean call a property IssueData. this property exist in
SimpleBean which create a connection from DB and insert the data.
At run time servlet and server also show that loggging are saved in DB.
But when I open the table in Access. Its empty.
Ms-Access have two fields- User, Password both are text type.
Please review these code:
login.html:
<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>LoginServlet.java:
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String user=request.getParameter("user");
String pass=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setUserName(user);
st.setPassword(pass);
request.setAttribute("user",st);
request.setAttribute("pass",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String user="";
private String pass="";
private String s="";
public String getUserName() {
return user;
public void setUserName(String user) {
this.user = user;
public String getPassword() {
return pass;
public void setPassword(String pass) {
this.pass = pass;
public String getIssueData() //method that create connection with database
try
System.out.println("Printed*************************************************************");
getUserName();
getPassword();
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:odbc:simple");
System.out.println("Connected....");
PreparedStatement st=con.prepareStatement("insert into Table1 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String User=getUserName();
st.setString(1,User);
String Password=getPassword();
st.setString(2,Password);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}submit.jsp:
This is Submit page
<html><body>
Hello
Student Name: <%= ((co.SimpleBean)request.getAttribute("user")).getUserName() %>
<br>
Password: <%= ((co.SimpleBean)request.getAttribute("pass")).getPassword() %>
<br>
<jsp:useBean id="st" class="co.SimpleBean" scope="request" />
<jsp:getProperty name="st" property="IssueData" />
</body></html>web.xml:<web-app>
<servlet>
<servlet-name>one</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>one</servlet-name>
<url-pattern>/tmp</url-pattern>
</servlet-mapping>
<jsp-file>issue.jsp</jsp-file>
<jsp-file>submit.jsp</jsp-file>
<url-pattern>*.do</url-pattern>
<welcome-file-list>
<welcome-file>Login.html</welcome-file>
</welcome-file-list>
</web-app>Please Help me..Thanks.!!!
--

Dear Sir,
Same issue is still persist. Input parameter are not store in database.
After follow your suggestion when I run this program browser show that:i.e
This is Submit page Hello Student Name: vijay
Password: kumar
<jsp:setProperty name="st" property="userName" value="userValue/> Your logging is saved in DB
Please review my code.
login.html:
{code}<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>{code}
LoginServlet.java:
{code}import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String userValue=request.getParameter("user");
String passValue=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setuserName(userValue);
st.setpassword(passValue);
request.setAttribute("userValue",st);
request.setAttribute("passValue",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}{code}
SimpleBean.java:
{code}package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String userValue="";
private String passValue="";
private String s="";
public String getuserName() {
return userValue;
public void setuserName(String userValue) {
this.userValue = userValue;
public String getpassword() {
return passValue;
public void setpassword(String passValue) {
this.passValue= passValue ;
public String getissueData() //method that create connection with database
try
System.out.println("Printed*************************************************************");
getuserName();
getpassword();
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Connection loaded");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("insert into vij values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String userName=getuserName();
st.setString(1,userName);
String password=getpassword();
st.setString(2,password);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}{code}
submit.jsp:
{code}This is Submit page
<html><body>
Hello
Student Name: <%= ((co.SimpleBean)request.getAttribute("userValue")).getuserName() %>
<br>
Password: <%= ((co.SimpleBean)request.getAttribute("passValue")).getpassword() %>
<br>
<jsp:useBean id="st" class="co.SimpleBean" scope="request" />
<jsp:setProperty name="st" property="userName" value="userValue/>
<jsp:setProperty name="st" property="password" value="passValue"/>
<jsp:getProperty name="st" property="issueData" />
</body></html>web.xml:<web-app>
<servlet>
<servlet-name>one</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>one</servlet-name>
<url-pattern>/tmp</url-pattern>
</servlet-mapping>
<jsp-file>submit.jsp</jsp-file>
<url-pattern>*.do</url-pattern>
<welcome-file-list>
<welcome-file>Login.html</welcome-file>
</welcome-file-list>
</web-app>Sir I can't use EL code in jsp because I use weblogic 8.1 Application Server.This version are not supported to EL.
Please help me...How store th input parameter in Database through Java Bean

Column Not found error while trying to access databse through JSP+Java Bean

I am trying to acees MS Access 2003 db through JSP using Tomcat 5.0.28.The code for accessing the databse is incorporated in the bean.The jsp only calls the particular method of the bean .
Code for Java Bean:
package ActiveViewer;
import java.sql.*;
import java.util.*;
public class CompanyBean
Connection con;
ResultSet rs=null;
Statement st;
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System.out.println("Here4");
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The code for JSP that uses the above bean is:
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<html>
<body>
<% String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println("username:"+username);
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conn.connect();
ResultSet rs=conn.select(username);
System.out.println("Below select ");
while (rs.next())
String dbusername=rs.getString("username");
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     if(dbusername.equals(username) && dbpassword.equals (password))
{ %> out.println("OK");
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<br>Clickhere to go back to Login Page.
<% }
} %>
</body>
</html>
I get the following error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Column not found
though the database is not int he same folder as the jsp, the DSN is set correctly to pint to the db location.The jsp does print in stdout file:
Here4 (from connect method above)
Here 1 (from connect method above)
Below Select (from jsp)
This means that the jsp does connect to db but it gives the above error.Also the field name also matches that in the database and data is present in the db too.
All other things like creating package for bean,incorporating the packakage are done.
Can someone please help me with their precious advice?

U're getting this error because there is no field called 'password' in ur database, the field in ur database is named 'cpassword' and not 'password'. So change the statement rs.getString("password"); to rs.getString("cpassword");

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Request parameter are not stored in database through Java Bean

Hi,
I want to store the request parameter in database through Java Bean.Allthough program are properly run but value are not store in DB.
Here My code:
Login.html:<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="submit.jsp" >
Name: <input type="text" name="User">
Password: <input type="password" name="Pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean implements java.io.Serializable{
private String User="";
private String Pass="";
public SimpleBean(){}
public String getUser() {
return User;
public void setUser(String User) {
this.User = User;
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return Pass;
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this.Pass = Pass;
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try
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Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:odbc:Ex11dump");
System.out.println("Connected....");
PreparedStatement st=con.prepareStatement("insert into Table1 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
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st.setString(1,User);
String Pass=getPass();
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con.commit();
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System.out.println("Your logging is saved in DB *****************");
catch(Exception e)
e.printStackTrace();
}submit.jsp:
<jsp:useBean id="obj" class="co.SimpleBean"/>
<jsp:setProperty name="obj" property="*" />
<jsp:getProperty name="obj" property="User" /> <br>
<jsp:getProperty name="obj" property="Pass" /> <br>
<% obj.show();%>
<%
out.println("Ur data is saved in DB");
%>Please Help me.
Thanks.

The issue is in the naming of your fields.
Change User -> user and Pass->pass
Name: <input type="text" name="user">
Password: <input type="password" name="pass">

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Hi,
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Hello Sir,
when I insert the parameter in run time, weblogic server and JSP show that parameter are saved.
Allthough row increment in database but they not show in database.
Here My Code:
login.html:
<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>LoginServlet.java:import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String user=request.getParameter("user");
String pass=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setuserName(user);
st.setpassword(pass);
request.setAttribute("user",st);
request.setAttribute("pass",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String user="";
private String pass="";
private String s="";
public String getuserName() {
return user;
public void setuserName(String user) {
this.user = user;
public String getpassword() {
return pass;
public void setpassword(String Pass) {
this.pass= pass ;
public String issueData()
try
System.out.println("Printed*************************************************************");
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Connection loaded");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("insert into vij2 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String NAME=getuserName();
st.setString(1,NAME);
String PASSWORD=getpassword();
st.setString(2,PASSWORD);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}submit.jsp:This is Submit page
<jsp:useBean id="st" class="co.SimpleBean"/>
<jsp:setProperty name="st" property="*" />
<jsp:getProperty name="st" property="userName" /> <br>
<jsp:getProperty name="st" property="password" /> <br>
<% st.issueData();%>
<%
out.println("Ur data is saved in DB");
%>Please Help me.
Thanks.

Ok, this seems to be a long and convoluted path to do absolutely nothing.
You submit the form.
You run a servlet that gets the parameters correctly (good), creates a SimpleBean (good) and then sets this into request attribute space under the names "user" and "pass" - (why?)
You then forward to the jsp: submit.jsp.
Submit.jsp creates a new SimpleBean, and attempts to populate it with <jsp:setProperty>. You then call the issueData method on it.
Your complaint: Rows are being created in the database which have empty string values instead of the parameters you have passed.
So, why are the values blank? Where do you think these values should be coming from?
Looking at SimpleBean we find one mistake - you have mis-named your get/set methods.
To properly follow java beans standards, you should use camel-case for your methods.
Rather than getuserName() the method should be getUserName(). getpassword() should be getPassword() etc etc.
The method getUserName() defines a property "userName" for the bean.
Once that is fixed, lets go to submit.jsp. The <jsp:setProperty> statement will try and set all properties of the bean from the request parameters.
There are no request parameters "userName" or "password" so those values don't get set in the bean, therefore it uses their default value of empty string - "".
There ARE request parameters called "user" and "pass" but because they aren't properties of the bean, they get ignored.
As a result, the values are empty string, and that is exactly what gets inserted into the database.
Ways to fix this
1 - rename your parameters on your form to be "userName" and "password" to match the bean. That way the <jsp:setProperty> tag will populate them properly.
or
2 - Call issueData() method from your servlet after you have created the SimpleBean. Better in my opinion as you then don't have any scriptlet code on a JSP page.
Cheers,
evnafets

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WPC: Access Java beans from XSL

Hi,
How can we access custom Java beans from within the XSLs used to render WPC webforms? Do we have to implement a custom XSLT Helper? I am able to access standard Java classes using the <xmlns> tag but when I try to reference our custom classes the WPC editor throws a ClassNotFound exception. Any help will be appreciated.
Thanks and Regards,
Shibendra

Hi,
How can we access custom Java beans from within the XSLs used to render WPC webforms? Do we have to implement a custom XSLT Helper? I am able to access standard Java classes using the <xmlns> tag but when I try to reference our custom classes the WPC editor throws a ClassNotFound exception. Any help will be appreciated.
Thanks and Regards,
Shibendra

How Get ICubeContext at Java bean (Spring Context)

Hello,
I need to get the ICubeContext in a Java Bean (Spring Context). Is possible?
For example in a custom xpath fuction, is very easy:
public Object call(IXPathContext context, List args) throws XPathFunctionException {
    Map props = (Map) context.getVariableValue(null, null, "xpath-function-data");
    ICubeContext ctx = (ICubeContext) props.get("ICubeContext");
I would appreciate any help. Thank you very much!
Sergio.

This is a possible solution:
BPELContext bc = BPELContext.peekThreadBPELContext();
    if (bc == null)
      return null;
    ICubeContext ctx = bc.getCubeContext();
not yet tested!!

Access Context Parameter in Java Bean.

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