trouble in using connection pooling in tomcat

[sajjad ahmad]

HI!
i have followed all steps given in
http://localhost:8080/tomcat-docs/jndi-datasource-examples-howto.html
to configure datasource in tomcat4.0
everthing is set according to the documentation
i use following snipit to access the datasource

try {
Context initContext = new InitialContext();
Context envContext = (Context)initContext.lookup("java:/comp/env");
DataSource ds = (DataSource)envContext.lookup("jdbc/myoracle");
Connection conn = ds.getConnection();
}
catch (SQLException ex1) {
System.out.println("SQLException "+ex1);
}
catch (NamingException ex1) {
System.out.println("NamingException "+ex1);
}
but get the following exception in tomcat

========================================================
Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:534)


root cause

java.lang.NullPointerException
at org.apache.commons.dbcp.DelegatingConnection.close(DelegatingConnection.java:195)
at org.apache.commons.dbcp.PoolableConnection.reallyClose(PoolableConnection.java:129)
at org.apache.commons.dbcp.PoolableConnectionFactory.destroyObject(PoolableConnectionFactory.java:311)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:842)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:821)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:518)
at com.cstl.personalloan.test.TestingDataSource.(TestingDataSource.java:18)
at org.apache.jsp.TestingDataSource_jsp._jspService(TestingDataSource_jsp.java:45)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:601)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:534)

=======================================================


cannot figure out where i am missing something can anybody please guide me in that regard
thanks in advance
[ July 15, 2005: Message edited by: Bear Bibeault ]

[Sonny Gill]

Originally posted by sajjad ahmad:

at com.cstl.personalloan.test.TestingDataSource.(TestingDataSource.java:18)

What happens on/around line 18 in this class?
That might give a pointer to the real cause of the error.

[sajjad ahmad]

that class is as follows
package com.cstl.personalloan.test;

import javax.naming.*;
import javax.sql.*;
import java.sql.Connection;
import java.sql.*;
public class TestingDataSource {
public TestingDataSource() {
try {
Context initContext = new InitialContext();
Context envContext = (Context)initContext.lookup("java:/comp/env");
DataSource ds = (DataSource)envContext.lookup("jdbc/myoracle");
Connection conn = ds.getConnection();
}
catch (SQLException ex1) {
System.out.println("SQLException "+ex1);
}
catch (NamingException ex1) {
System.out.println("NamingException "+ex1);
}

}
public static void main (String args[]){
TestingDataSource testingDataSource = new TestingDataSource();
}
}

and that line is (after deleting loging details)
Connection conn = ds.getConnection();
what do you thik y is that excaption raised here
waiting for your reply

[Craig Jackson]

It looks like your environment/resource pointing to your datasource may not be configured correctly, thus returning a null reference.

Verify that the environment reference is configured correctly i.e. it could be something as simple as a typo.

 DataSource ds = (DataSource)envContext.lookup("jdbc/myoracle"); 

[sajjad ahmad]

HI thanks for those quick replies
Actually i was missing somethign in driver url there in server.xml

i have fixed that out and now also have checked the datasource i get (that is not null) but still i am getting another exception
============================================================================
org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFact
ory, cause:
java.sql.SQLException: Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNU
M=153092352)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java)
at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(Driv
erConnectionFactory.java:82)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(Poolable
ConnectionFactory.java:300)
at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(Bas
icDataSource.java:838)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSou
rce.java:821)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource
.java:532)
at com.cstl.personalloan.test.TestingDataSource.<init>(TestingDataSource
.java:18)
at org.apache.jsp.TestingDataSource_jsp._jspService(TestingDataSource_js
p.java:45)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:2
95)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2416)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:22
3)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:601)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:619)
at java.lang.Thread.run(Thread.java:534)
============================================================================
have you any idea about that

[Craig Jackson]

It looks like your having a problem connecting to your database:

 java.sql.SQLException: Io exception: Connection refused 

I would verify that the user/password that you are using to connect to your database is valid and have the correct priviledges.

[maria pasha]

try this out...another way of creating a connection

create a folder eg connect in the same folder which is holding your current file and make a file..etc file.jsp

<%
<%
String DDRIVER = "sun.jdbc.odbc.JdbcOdbcDriver";
String UUSERNAME = "";
String PPASSWORD = "";
String SSTRING = "jdbc dbc atabasename";
%>

put your username password etc

and then in the original file do this

%@ page contentType="text/html; charset=windows-1251" %>
<%@ page import="java.sql.*" %>

<%@ include file="/connect/file.jsp" %>


<%

Class.forName(DDRIVER).newInstance();
System.out.println("got connection");

Connection conn1 = DriverManager.getConnection(SSTRING,UUSERNAME,PPASSWORD);

Statement st1=conn1.createStatement();

%>

<html>
<head> blah </head>

</html>


if this doesnt work...check out your connection and the name of the database.