Bc4j, jsp, oracle9ias appl - inreasing database connections

Hi,
I have a BC4J application developed in jdev 3.1, front end is jsps. the application is deployed on oracle9ias. The application is in statleful mode.
As application users connect to the application, the number of database sessions keeps on increasing, and not freed even when the browser is closed and the http session ends.
How can we release these sessions from the database (so that v$session does not show them anymore).
Aparna.

By default BC4J uses a connection pool to reuse JDBC connections. Once an application module is disconnected the JDBC connection is rolled back and then returned to the connection pool instead of being closed. This is why the sessions continue to appear in the v$session table.
Please see the BC4J connection pooling documentation for more information about configuring the JDBC connection pool. You may be interested in setting a max JDBC connection pool size.
.

Similar Messages

BC4J/UIX: Multiple Application Modules / Database Connections

My UIX application must have access to two databases. One is the main database for the application and the other contains lookup information. The lookup database is shared by many applications of different types. I need to display values in the UIX page and also create a composite view from tables in each database.
My understanding of this is that a UIX page requires a root Application Module which can have nested application modules allowing construction of a complex application. It appears that a UIX page must be tied to the root Application Module and then the nested modules can be referenced and used later in the UIX page.
Can I create a root Application Module that contains a nested application module that connects to a different database? If so, are there limitations in building associations between the AM's that use different databases?
If this is possible, how do I do it? I have created separate projects: one for each of the databases I mentioned and one for the main application module in a separate project. I try to create a "New Business Components Package" and "EJB Entity Facades for existing Entity Beans". The two application modules do not appear. (I created jar files for each of them and referenced these as libraries in the root module project.) Is this the correct approach? I have not found documentation that shows me how to do this yet so I admit I could be completely off base.

Okay, I figured out that I have to build all of the BC4J packages under the same project and that the EJB Entity Facades is not what I should be working with.
Maybe I will figure out the rest before too long.

How can I reuse the BC4J database connection?

How can I reuse the BC4J database connection?
I want to use the application module connection without opening another in a custom code. At this level I canât access de ADF code, thatâs why I canât get the DBConnection from the application module.
Now, I have a âdata-sources.xmlâ in my project and the application module is configured to access the database from this xml file.

I found the solution in other Forum. I worked ok.
Here the code:
If the Connections-Navigator connection is DBConnection1, the corresponding datasource is jdbc/DBConnection1DS.
1. Create a JSP page.
2. In the web.xml of the JSP add
<resource-ref>
<res-ref-name>jdbc/DBConnection1DS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
3. In the JSP page obtain a connection with the datasource.
InitialContext initialContext = new InitialContext();
javax.sql.DataSource ds = (javax.sql.DataSource)initialContext.lookup("java:comp/env/jdbc/DBConnection1DS");
java.sql.Connection conn = ds.getConnection();

Open and close database connection jsp page

hi there, i wanna know about how to open database connection to Mysql at the beginning of the page and close the connection at the end of the page. The jsp page contain all processing code.
plz help me...thx thx

<html>
<head>
<basefont face="Arial">
</head>
<body>
<%@ page language="java" import="java.sql.*" %>
<%!
// define variables
String id;
String firstName;
String lastName;
// define database parameters, change this according to your needs
String host="localhost";
String user="root";
String pass="";
String db="test";
String conn;
%>
<table border="1" cellspacing="1" cellpadding="5">
<tr>
<td><b>id</b></td>
<td><b>first name</b></td>
<td><b>last name</b></td>
</tr>
<%
Class.forName("org.gjt.mm.mysql.Driver");
// create connection string
conn = "jdbc:mysql://" + host + "/" + db + "?user=" + user
+ "&password=" + pass;
// pass database parameters to JDBC driver
Connection Conn = DriverManager.getConnection(conn);
// query statement
Statement SQLStatement = Conn.createStatement();
// generate query
// change this query according to your needs
String Query = "SELECT id, firstname, lastname FROM abook";
// get result
ResultSet SQLResult = SQLStatement.executeQuery(Query);
while(SQLResult.next())
   id = SQLResult.getString("id");
   firstName = SQLResult.getString("firstname");
   lastName = SQLResult.getString("lastname");
        out.println("<tr><td>" + id + "</td><td>" +
     firstName + "</td><td>" + lastName + "</td></tr>");
// close connection
SQLResult.close();
SQLStatement.close();
Conn.close();
%>
</table>
</body>
</html>hi :-)
i've got that on the net as part of the tutorial on jsp (long long time ago)
you just have to be resourceful in finding solutions :-)
try google :-) there are lot's of tutorial available in there ;-)
goodluck ;-)
regards,

How to reuse a 9iAS Portal database connection in a BC4J application?

Hi,
I have a 9iAS Portal 9.0.2 application, and I want to call a BC4J/UIX application from the Portal application. Ideally I would like to reuse the database connection already established within Portal, because it has authenticated the user with the SSO, and has all of the Portal and VPD settings already in the environment. I don't want to ask the users to re-log in.
I have looked at the Portal Java PDK and cannot find anything appropriate - has anyone accomplished this, or is there another way of doing this?
Thanks,
Steve

BC4J supports JAAS authentication.. look at the jazn stuff. When u deploy your application on 9ias one of the pages in the wizard asks what kind of authenticatoin you would like to use, you might be able to set something up there...
Also you an secure the URL in the httpd.conf file so that if a user directly attemps to access that application they are presented with the SSO log in screen.

When and How to close database connection in JSP?

Hi there,
I am using MySQL and JDBC 3.0, in my system, When and How to close database connection in JSP?
Thanks in advance.
Lonely Wolf
<%@ page session="true" language="java" %>
<jsp:include page="checkauthorization.jsp" />
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %>
<%--
Execute query, with wildcard characters added to the
parameter values used in the search criteria
--%>
<sql:query var="availablecomputerList" dataSource="jdbc/Bookingcomputer" scope="request">
SELECT * FROM computer where status=0
order by s_code
</sql:query>
<html>
<head>
<title>Search Result</title>
</head>
<body bgcolor="white">
<center>
<form action="checkin.jsp" method="post">
<input type="submit" value="Back to Check-in Page">
</form>
<c:choose>
<c:when test="${availablecomputerList.rowCount == 0}">
Sorry, no available computer found.
</c:when>
<c:otherwise>
The following available computers were found:
<table border="1">
<th>Computer</th>
<th>Description</th>
<th>Status</th>
<c:forEach items="${availablecomputerList.rows}" var="row">
<tr>
<td><c:out value="${row.s_code}" /></td>
<td><c:out value="${row.description}" /></td>
<td><c:out value="${row.status}" /></td>
</tr>
</c:forEach>
</table>
</c:otherwise>
</c:choose>
</center>
</body>
</html>

when should you close the connection? when you're done with it.
how should you close the connection? like this: conn.close();
that said, doing this in a JSP page is bad form and not recommended
JSP's typically don't contain ANY business or data logic

Bc4j.xcfg, database connections and deploying ADF apps to oc4j

I'm trying to understand how to enable custom database connections on a JDeveloper ADF application deployed to a stand-alone instance of OC4J.
All entity objects were created as ADF Business Components.
I looks like the db connection information used by the application is stored in a file named "bc4j.xcfg".
How would I change the database connection information between different environments, changing the server, port and password information from an OC4J instance?
I'd like to use an OC4J defined data-sources.xml file, but am looking for the simplest approach for now.

Tomato tomaato, call it what you will, we now have to spend time (money) figuring out how to change from using the recommended use of a "connection" from Oracle tutorials and in Oracle Press books.
Plus, neither I nor our client can get JDeveloper ADF 10.1.3 to work on OAS 10.1.2.
Oracle has been of little help, other than stating to follow documentation. We followed the documentation at least a dozen times and on three different install of OAS 10.1.2.
Why doesn't JDeveloper have a check-box or button that reconfigures the application to run on 10.1.2 (J2EE 1.3), there is a check-box to change JDK versions (1.4)? This is suspect to me.
We are going to be speaking with the client this week, and have to state the ADF application works, but NOT on OAS 10.1.2.
Does ADF work on OAS 10.1.3, absolutely, but the client is in 10.1.2 and can not upgrade at this time.
I've read in blogs where lots of developers have the same issues without resolution and Oracle should just come out and state that 10.1.3 does not work on 10.1.2.
So my experience has been a mixed bag with ADF, both in terms of the software and customer support from Oracle.

Jsp-database connectivity problem

hi
There is a problem, when ever i write a jdbc code for database connectivity through MsAcess, in general applications it works fine. But when ever i try to the same using Jsps it throws an exception that " Microsoft jdbc-odbc driver not fount, Default driver not specified"
please do help regarding this
the code i used is
package Products; import java.sql.*;import java.util.*; public class product{ public Vector getCategories() { Connection con; Statement st; ResultSet rs; Vector ret=new Vector(1,1); try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con=DriverManager.getConnection("jdbc:odbc:Web"); st=con.createStatement(); rs=st.executeQuery("Select * from Categories"); while(rs.next()) { ret.add(rs.getString(2)); ); } } catch(Exception e) { //System.out.println("Exception..."); ret.add(e.getMessage()); } return ret; }}

Have you downloaded the driver and put it in your Web-Server?
In tomcat you simply need to copy the file in:
Tomcat 5.0\common\lib

How to establish a MYSQL Database connection in JSP page.

Hi People,
Tell me how to establish mysql database connection in JSP page.
Needed details on:
1) what are all the mysql drivers need to be included.
2) what is the syntax for establish a database connection

hi,
http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.htmlsee down for mysql config with tomcat

Problem in Oracle Database Connectivity in JSP

I am having big problem such as Oracle Database connectivity problem
Following code i am used for database connection. but it throw an exception call class not found exception.
Pls any one can help me. With a sample code for Oracle Database connection in JSP
Class.forName ("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@172.25.44.54:1521:bbo";
con = DriverManager.getConnection(url,"user", "user123");
Thank you

Well i've never used oracle or their drivers before but i'm presuming that you'd go to oracle.com or something and look for downloads. Otherwise you could goodle for Oracle JDBC drivers. Then just follow the instructions.
Again i've never used JSP but if you have a manifest file somewhere you'll need to put a class-path: entry in their referecning the jar file with the driver so that it is availble at run-time.
Wes

DATABASE CONNECTIVITY PROBLEM IN JSP

Hello Friends .
I am facing problem in database connectivity with JSP . Following is the code .
<%
String accessDBURLPrefix = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=";
String accessDBURLSuffix = ";DriverID=22;READONLY=false}";
String databaseURL = accessDBURLPrefix + "db1.mdb" + accessDBURLSuffix;
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
java.sql.Connection con = java.sql.DriverManager.getConnection(databaseURL, "", "");
out.println("Connection created sucessfully");
catch(Exception e)
out.println(e);
%>
It gives following output :
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Could not find file '(unknown)'.
If I run the code in core java application then it works sucessfully .
Plz help me to find the solution .
I am using sun studio Enterprise 8.1
have stored the access file in web direcotry in the project.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Please use CODE tags when posting code. You are losing some of the plus signs of string concatenation to the forum's formatting beast.
Preferred solution: Don't use Access as a database. The JDBC-ODBC bridge is always troublesome.
If you must use Access...
Well the message is easy enough to understand: it can't find the database db1.mdb.
You say you put db1.mdb in the web directory. Obviously the computer is not looking there (silly computer for not looking where you put the file)
So it is up to you to be smart and tell the computer exactly where to go.
Using application.getRealPath("/db1.mdb") in place of "db1.mdb" will probably work in a JSP.
String databaseURL = accessDBURLPrefix + application.getRealPath("/db1.mdb") + accessDBURLSuffix;cheers,
evnafets

Configuring database connection (metadata repository) from jsp

anybody could help me to configuring database connection from portal schema from jsp page.
i dont have idea.
Thanks.

Hi,
You won't be able to access the DB connections used by iAS from the JSP. As these connections are managed by mod_plsql component in iAS.
Thanks,
Ved

Database Connection Problem, JSP, Tomcat5.5.9, Oracle9i

hi,
Am trying to make database connection using Oracle9i thin driver, what am doing is:
I put classes12.zip and classes12_dms.jar in the classpath and also added these libraries in netbeans library folder.
I make jsp page like this --------
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import="java.util.*, java.sql.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Testing Page</title>
</head>
<body>
<%
String url = "jdbc:oracle:thin:@SERVERNAME:1521:DBNAME";
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection(url,"scott","tiger");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from person order by name");
%>
<h1>Testing Page</h1><hr>
<table border="1">
<tbody>
<tr>
<th>Name</th>
<th>Email</th>
</tr>
<% while(rs.next()) {%>
<tr>
<td><%= rs.getString(1)%></td>
<td><%= rs.getString(2)%></td>
</tr>
<%
rs.close();
stmt.close();
conn.close();
} catch(ClassNotFoundException CNFEx) {
out.println("<b>Error !</b><br>" + CNFEx.getMessage());
} catch(Exception Ex) {
out.println("<b>Error !</b><br>" + Ex.getMessage());
%>
</tbody>
</table>
</body>
</html>
when I run this page i got this error messages ----
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:138)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
root cause
java.lang.NoClassDefFoundError
oracle.jdbc.driver.OracleConnection.createDMSSensors(OracleConnection.java:506)
oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:330)
oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:485)
oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:337)
java.sql.DriverManager.getConnection(Unknown Source)
java.sql.DriverManager.getConnection(Unknown Source)
org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:79)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
any kind of help is appericiable.
thanks.....

I'd start by checking for a more recent driver version on Oracle's web site.
Or: googling for "createDMSSensors" (the "root cause" in the stack trace) has as the first hit: Re: Java Help Please! HttpServlet doFilter() Exception

Keeping Database-Connection over several JSPs

Hi all,
when creating a database-connection (Oracle 8.x) with JDBC 2, Tomcat Engine, I encountered the problem, that the connection has been lost after forwarding to another JSP.
What I read from some other forums, there seem to be 2 major ways of how to keep the connection:
- session vars
- connection pool
I feel for our project session will be a approbiate solution, so can you tell me more about it (technical implementation)???
Thanks & Rgds.,
Rainer

you have to declare a bean variable with session scope, like this:
jsp:useBean     id="object-name"
     scope="session"
     type="type-of-object"
     class="fully-qualified-classname"
     beanName="fully-qualified-beanName"
/>
for more infos see (for example) http://www.stardeveloper.com/articles/display.html?article=2001072001&page=1

Jsp and database connection using bean

* I want create a bean to handle database connectivity.The
          <jsp:usebean> tag uses
          no argument constructor ..so I cannot pass the userid and password to
          the constructor.
          So how can I create a database connection when the user_id and password
          will be a part of parameter ?
          * Now I'm opening database connection in the jsp scriplets. Everytime I
          refresh the
          jsp page a new connection is created ? Is it not going to choke the
          database ? I cannot use connection pool because every user logs in with
          different userid.
          Thanks


You can pass your arguments in this way:
          <jsp:usebean id="myBean" scope="page"/>
          <jsp:setProperty name="myBean" property="userId", value=<%= user_id%>/>
          <jsp:setProperty name="myBean" property="password", value=<%=
          user_password%>/>
          of course, in your bean class, you should create two setter methods,
          setUserId and setPassword.
          Hopefully, this will help you.
          sonia WEN
          Chiranjib Misra wrote:
          > * I want create a bean to handle database connectivity.The
          > <jsp:usebean> tag uses
          > no argument constructor ..so I cannot pass the userid and password to
          > the constructor.
          > So how can I create a database connection when the user_id and password
          > will be a part of parameter ?
          >
          > * Now I'm opening database connection in the jsp scriplets. Everytime I
          > refresh the
          > jsp page a new connection is created ? Is it not going to choke the
          > database ? I cannot use connection pool because every user logs in with
          > different userid.
          >
          > Thanks

Bc4j, jsp, oracle9ias appl - inreasing database connections

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