Database Connection Hangs - getConnection()

Dear Friends,
i have a serious problem with a database connectivity,
now the issue is,i have written the code to connect to the databaseserver which is in some remote place,it loads the driver,that's the oracle driver,but when it comes to DriverManager.getConnection,that's the connectivity with the database it hangs.Now first i thought their might be a network problem but then it should give a networkexception,and also i put some dummy userid,password and also the IPAddresse,port number ,and it gave me a SQLException,so i assume that their is no network problem.then my question is why does it get hangs when the control comes to the getConnection method,
what might be the problem?
Is there any problem with the database server? Plz Help Me!

Jeba,
Fill in the blank: Assumption is the mother of all .... ups. :P
I'm not an Oracle expert or even Oracle novice, but some simple principles should apply.
First up, can you reach the database server with simple stuff like ping.
If you can, can you then see shared folders etc from your browser?
If the answer to these is yes, you should not have a network problem.
As a suggestion, try to ensure that you have a user name / password combination with the highest access rights possible - On at least one other database there are issues to do with rights associated with different usernames.
Finally, do you have something like dbVisualiser?
Google it and download it. You already have the jdbc drivers which it needs, so just configure it as needed and see if it can connect. If it can, you may have a problem with your connection string.

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Database Connection Hanging!

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When I check ps -ef | grep gdwd (where gdwd is the listener name), this is result.
glgldvdb01[export/home/oracle]ps -ef | grep gdwd
oracle 11400 1 0 Apr 05 ? 67:08 /u00/oracle/product/gdwd/db_1/bin/tnslsnr gdwd -inherit
oracle 15638 15633 0 09:00:29 ? 0:00 /u00/oracle/product/gdwd/db_1/bin/tnsping (ADDRESS=(PROTOCOL=TCP)(HOST=glgldvdb
oracle 29007 29003 0 19:34:29 ? 0:00 /u00/oracle/product/gdwd/db_1/bin/lsnrctl
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oracle 10077 10073 0 19:40:29 ? 0:00 /u00/oracle/product/gdwd/db_1/bin/tnsping (ADDRESS=(PROTOCOL=TCP)(HOST=glgldvdb
oracle 12273 12270 0 19:25:29 ? 0:00 /u00/oracle/product/gdwd/db_1/bin/tnsping (ADDRESS=(PROTOCOL=TCP)(HOST=glgldvdb
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oracle 18352 16849 0 09:01:40 pts/4 0:00 grep gdwd
oracle 11319 11400 0 19:24:36 ? 0:00 /u00/oracle/product/gdwd/db_1/bin/tnslsnr gdwd -inherit
oracle 15633 15590 0 09:00:29 ? 0:00 sh -c /u00/oracle/product/gdwd/db_1/bin/tnsping "(ADDRESS=(PROTOCOL=TCP)(HOST=g
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Note : We are in two node RAC environment.
Thanks in advance,
Rajesh Marath
Message was edited by:
Rajesh Marath

Pls check listener.log, is there any error. ?
Also search metalink/open tar, this might be a known issue.
Cheer,
Virag Sharma
Message was edited by:
virag_sh

Database connection Hangs - Urgent

Hello
I installed 9i db on one machine and I was able to connect from clients, then I installed 9ias on the same machine and now sqlplus hangs on the client when i try to connect. however tnsping is going thru.
Please , where/what do i need to do?. Such a configuration already exists on another machine and works fine (development).
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Hi Thanks for the response.
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NB. My application is able to connect via the middle tier(application server) !
Listener Status at DB Home:
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC0)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 9.2.0.4.0 - Produc
tion
Start Date 11-MAR-2004 12:26:41
Uptime 3 days 20 hr. 20 min. 6 sec
Trace Level off
Security OFF
SNMP OFF
Listener Parameter File C:\oracle\ora92\network\admin\listener.ora
Listener Log File C:\oracle\ora92\network\log\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=pProd)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "pProdhru.pProd.com" has 1 instance(s).
Instance "pProdhru", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
Listener Config at DB Home:
# LISTENER.ORA Network Configuration File: C:\oracle\ora92\network\admin\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = pProd)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\ora92)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = pProdhru.pProd.com)
(ORACLE_HOME = C:\oracle\ora92)
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Listener at Infrastructure Home:
# LISTENER.ORA Network Configuration File: c:\ProdINFRA\network\admin\listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = pProd)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = c:\ProdINFRA)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = iasdb.pProdhru.pProd.com)
(ORACLE_HOME = c:\ProdINFRA)
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Any Thing I'm Missing ?

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I'm using the connection pooling system from Jakarta commons. My database access works fine most of the time, but for some reason sometimes the database hangs. I will try to access the web-app and the login screen will come up fine, but when I try to log in the app will just sit there trying to access the database forever, and from that point on no database access will work. Here is the code I use to get the connections and access the database. Is there anything I am doing wrong that could be causing this?
import java.sql.DriverManager;
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import javax.sql.DataSource;
import java.io.PrintWriter;
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import org.apache.commons.dbcp.PoolingDataSource;
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import org.apache.commons.dbcp.DriverManagerConnectionFactory;
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And here is my database code:
import java.sql.*;
import com.mysite.ConnectionManager;
import java.util.HashMap;
import java.util.Iterator;
Manages a database after getting a database connection from a {@url ConnectionManager} object.
Can do queries and database updates, as well open and close connections.
public class DatabaseManager {
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     @return
     @see
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                    rs.absolute(rowNumber);
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     @param id value of ID
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     @see
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Help! My database connection from BMP Entity bean dies after a while!!!

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Hi again!
Sorry for the delay, but I have been busy lately.
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     at oracle.ons.NotificationQueue.internalDequeue(NotificationQueue.java:255)
     - locked <0x92aed368> (a java.lang.Object)
     at oracle.ons.NotificationQueue.dequeue(NotificationQueue.java:215)
     at oracle.ons.SenderThread.run(SenderThread.java:81)
"Thread-5" daemon prio=1 tid=0x087f9d10 nid=0x5902 runnable [88769000..8876987c]
     at java.net.SocketInputStream.socketRead0(Native Method)
     at java.net.SocketInputStream.read(SocketInputStream.java:129)
     at oracle.ons.InputBuffer.readMoreData(InputBuffer.java:267)
     at oracle.ons.InputBuffer.getNextString(InputBuffer.java:222)
     at oracle.ons.ReceiverThread.run(ReceiverThread.java:228)
"TaskManager" prio=1 tid=0x087f9b30 nid=0x5902 waiting on condition [887ea000..887ea87c]
     at java.lang.Thread.sleep(Native Method)
     at com.evermind.util.TaskManager.run(TaskManager.java:247)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:534)
"Thread-4" prio=1 tid=0x08ca2fb8 nid=0x5902 in Object.wait() [891e2000..891e287c]
     at java.lang.Object.wait(Native Method)
     - waiting on <0x92aee258> (a java.util.TaskQueue)
     at java.util.TimerThread.mainLoop(Timer.java:429)
     - locked <0x92aee258> (a java.util.TaskQueue)
     at java.util.TimerThread.run(Timer.java:382)
"AJPConnectionListener [0.0.0.0/0.0.0.0:3302]" prio=1 tid=0x086f1668 nid=0x5902 runnable [8a7ca000..8a7ca87c]
     at java.net.PlainSocketImpl.socketAccept(Native Method)
     at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
     - locked <0x927a0390> (a java.net.PlainSocketImpl)
     at java.net.ServerSocket.implAccept(ServerSocket.java:448)
     at java.net.ServerSocket.accept(ServerSocket.java:419)
     at com.evermind.server.http.AJPConnectionListener.run(AJPConnectionListener.java:60)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:534)
"RMIServer [0.0.0.0:3202] count:2" prio=1 tid=0x086cbff0 nid=0x5902 runnable [8b172000..8b17287c]
     at java.net.PlainSocketImpl.socketAccept(Native Method)
     at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
     - locked <0x927a0850> (a java.net.PlainSocketImpl)
     at java.net.ServerSocket.implAccept(ServerSocket.java:448)
     at java.net.ServerSocket.accept(ServerSocket.java:419)
     at com.evermind.server.rmi.RMIServer.run(RMIServer.java:464)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:534)
"JMSServer[webprod:3702]" prio=1 tid=0x0879aff0 nid=0x5902 runnable [8b1f3000..8b1f387c]
     at java.net.PlainSocketImpl.socketAccept(Native Method)
     at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
     - locked <0x92746aa0> (a java.net.PlainSocketImpl)
     at java.net.ServerSocket.implAccept(ServerSocket.java:448)
     at java.net.ServerSocket.accept(ServerSocket.java:419)
     at com.evermind.server.jms.JMSServer.run(JMSServer.java:516)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
     at java.lang.Thread.run(Thread.java:534)
"LogFlusher" daemon prio=1 tid=0x081b91a0 nid=0x5902 waiting on condition [8b274000..8b27487c]
     at java.lang.Thread.sleep(Native Method)
     at oracle.core.ojdl.BufferedLogWriter$Flusher.run(BufferedLogWriter.java:354)
"Signal Dispatcher" daemon prio=1 tid=0x080ba9e0 nid=0x5902 waiting on condition [0..0]
"Finalizer" daemon prio=1 tid=0x080b61a8 nid=0x5902 in Object.wait() [8e9a7000..8e9a787c]
     at java.lang.Object.wait(Native Method)
     at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
     - locked <0x925b0378> (a java.lang.ref.ReferenceQueue$Lock)
     at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
     at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=1 tid=0x080b5dc8 nid=0x5902 in Object.wait() [8ea28000..8ea2887c]
     at java.lang.Object.wait(Native Method)
     at java.lang.Object.wait(Object.java:429)
     at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:115)
     - locked <0x925b02a0> (a java.lang.ref.Reference$Lock)
"VM Thread" prio=1 tid=0x080b52e0 nid=0x5902 runnable
"VM Periodic Task Thread" prio=1 tid=0x080bee08 nid=0x5902 waiting on condition
"Suspend Checker Thread" prio=1 tid=0x080b9fc8 nid=0x5902 runnable As far as I can see, my PreparedStatement (or connection) is locked.... Any ideas?
~Morten ;-)

Jdbc connection hang?

I used thin JDBC driver 9.0.1 comes with oracle 9i.
However, the connection hang in heavy load.
1. I try to check isClosed(), then reopen is more stable but problem is still exist.
2. It's more stable than 1. when do.. getConnection, do job and Close it. But another application connect more difficult get some error like 'not found oracle realm' or something.
Anybody has comment?
Thanks,
Kittikun Potivanakul
[email protected]

Hi to all and sorry for the delay of my reply.
I am not using RAC. After setting of the system property +"-Djava.security.egd=file:///dev/random"+ it has solved the +"Connection reset"+ problem, but after about one hour I get +"Connection closed"+ from each connection of the pool when the application uses it.
The pool uses the implicit cache mechanism of Oracle. Follow the properties of cache:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment> Oracle connection pool configuration file. </comment>

<entry key="InitialLimit">0</entry>

<entry key="MinLimit">0</entry>

<entry key="MaxLimit">10</entry>

<entry key="InactivityTimeout">240</entry>

<entry key="AbandonedConnectionTimeout">240</entry>

<entry key="ConnectionWaitTimeout">5</entry>

<entry key="ValidateConnection">true</entry>
</properties>
Edited by: user12098943 on Aug 24, 2011 10:31 AM

Problem with database connection in Jdev 11

Hello,
my jdev version is 11 and i want do really simple task create new database connection to my oracle db.
I open database navigator and click new connection. i want jdbc connection but after i fill this form i pressed test connection button and get this error msg:
Test failed: 4
i think i have correct information but i tried this, i opened my older jdev 10 and copy jdbc url from my old db connection.
In jdev 11 i checked Enter Custom JDBS Url and pasted url from jdev 10 and i get:
Test failed: 4
What is wrong?
Thanks for your advice.
J.

I add new information:
i cant connect to oracle db 8, but i try another db in my company which is 10 and its working fine.
I write java class and try connect to db 8 via jdbc manually:
String url = "jdbc:oracle:thin:@SERVER:1525:SID";
String user = "user1";
String password = "aaa";
Class.forName("oracle.jdbc.driver.OracleDriver");
// DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection(url, user, password);
and i get this:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4
     at oracle.jdbc.driver.T4C8TTIdty.marshal(T4C8TTIdty.java:468)
     at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:339)
     at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:621)
     at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:203)
     at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:501)
     at java.sql.DriverManager.getConnection(DriverManager.java:525)
     at java.sql.DriverManager.getConnection(DriverManager.java:171)
     at project1.Class1.main(Class1.java:31)
i hope this will be more usefull and i know i write this info about db's version little bit late.
J.

J2EE Struts - Database connection failed - help???:(

Hello,
I have built a little web application and it works without any problems. In the next step I tried to add a database connection but I have already worked on it for at least one day and I could not fix the problem with the database connection.
I downloaded the MySQL Server 5.0 and installed it, furthermore I have downloaded the jdbc driver mysql-connector-java-3.1.11.zip and extracted it to the MySQL Server 5.0 directory. Furthermore I have added under system settings - system - etended - system variables the whole path to the driver -> C:\Programme\MySQL\MySQL Server 5.0\mysql-connector-java-3.1.11\mysql-connector-java-3.1.11-bin.jar to the CLASSPATH systemvariable.
Then I have startet the SQL Server 5.0 with mysqld --console from the command line.
Furthermore I have added under Project-Properties-Java Build Path - Libraries - Add External JARs in Eclipse the mysql-connector-java-3.1.11-bin.jar to my Struts WebProject.
To test the whole thing I have added to the existing test-database from mysql a table named owner and wanted to test the database connection in the Action-class with the following statements - I quote the whole execute method of the OwnerAction class:
public ActionForward execute(
                 ActionMapping mapping,
                 ActionForm form,
                 HttpServletRequest request,
                 HttpServletResponse response)
                 throws Exception {
               OwnerForm ownerForm = (OwnerForm) form;
               String greet = ownerForm.getGreet();
               String name = ownerForm.getName();
               request.setAttribute("name", name);
               request.setAttribute("greet", greet);
               String address = ownerForm.getAddress();
               String email = ownerForm.getEmail();
               int tel = ownerForm.getTel();
               Connection conn = null;
               Statement stmt = null;
               ResultSet rs = null;
               DriverManager.registerDriver(new org.gjt.mm.mysql.Driver());
               conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","sa");
               try {
                     //conn = dataSource.getConnection();
                     stmt = conn.createStatement();
                     int id = 0;
                     rs = stmt.executeQuery("select max(id) as counter from owner");
                     while(rs.next()){
                        id = rs.getInt("counter");
                     id += 1;
                     stmt.executeUpdate("insert into owner values("+id+", '"+greet+"', '"+name+"', '"+email+"', '"+address+"', "+tel+")");
                     rs.close();
                     stmt.close();
                     conn.close();
                  catch(SQLException e){
                     throw new SQLException("database error");
                  // Forward control to the specified success target
                  return (mapping.findForward("success"));
      }But when I execute the WebApplication and the Action will be called the following error message appears in the browser:
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: Servlet execution threw an exception
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
root cause
java.lang.NoClassDefFoundError: org/gjt/mm/mysql/Driver
     com.asprise.struts.action.OwnerAction.execute(OwnerAction.java:72)
     org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs.
It must depend with anything that the driver was not found but I have defined it in the CLASSPATH variable and added it to the Web-Project in eclispe.
Has anybody an idea what I have else made wrong or have forgotten??:(:(:(
thanks in advance
lg
pat

One thing I have forgotten - I have also copied the mysql-connector-java-3.1.11-bin.jar in the WebRoot\WEB-INF\lib directory of my EasyStruts WebApplication.
Can anything else be wrong??:(:((
regards

J2EE - database connection failed...:(:(:(

Hello,
I have built a little web application and it works without any problems. In the next step I tried to add a database connection but I have already worked on it for at least one day and I could not fix the problem with the database connection.
I downloaded the MySQL Server 5.0 and installed it, furthermore I have downloaded the jdbc driver mysql-connector-java-3.1.11.zip and extracted it to the MySQL Server 5.0 directory. Furthermore I have added under system settings - system - etended - system variables the whole path to the driver -> C:\Programme\MySQL\MySQL Server 5.0\mysql-connector-java-3.1.11\mysql-connector-java-3.1.11-bin.jar to the CLASSPATH systemvariable.
Then I have startet the SQL Server 5.0 with mysqld --console from the command line.
Furthermore I have added under Project-Properties-Java Build Path - Libraries - Add External JARs in Eclipse the mysql-connector-java-3.1.11-bin.jar to my Struts WebProject.
To test the whole thing I have added to the existing test-database from mysql a table named owner and wanted to test the database connection in the Action-class with the following statements - I quote the whole execute method of the OwnerAction class:
public ActionForward execute(
                 ActionMapping mapping,
                 ActionForm form,
                 HttpServletRequest request,
                 HttpServletResponse response)
                 throws Exception {
               OwnerForm ownerForm = (OwnerForm) form;
               String greet = ownerForm.getGreet();
               String name = ownerForm.getName();
               request.setAttribute("name", name);
               request.setAttribute("greet", greet);
               String address = ownerForm.getAddress();
               String email = ownerForm.getEmail();
               int tel = ownerForm.getTel();
               Connection conn = null;
               Statement stmt = null;
               ResultSet rs = null;
               DriverManager.registerDriver(new org.gjt.mm.mysql.Driver());
               conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","sa");
               try {
                     //conn = dataSource.getConnection();
                     stmt = conn.createStatement();
                     int id = 0;
                     rs = stmt.executeQuery("select max(id) as counter from owner");
                     while(rs.next()){
                        id = rs.getInt("counter");
                     id += 1;
                     stmt.executeUpdate("insert into owner values("+id+", '"+greet+"', '"+name+"', '"+email+"', '"+address+"', "+tel+")");
                     rs.close();
                     stmt.close();
                     conn.close();
                  catch(SQLException e){
                     throw new SQLException("database error");
                  // Forward control to the specified success target
                  return (mapping.findForward("success"));
      }But when I execute the WebApplication and the Action will be called the following error message appears in the browser:
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: Servlet execution threw an exception
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
root cause
java.lang.NoClassDefFoundError: org/gjt/mm/mysql/Driver
     com.asprise.struts.action.OwnerAction.execute(OwnerAction.java:72)
     org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5 logs.
It must depend with anything that the driver was not found but I have defined it in the CLASSPATH variable and added it to the Web-Project in eclispe.
Has anybody an idea what I have else made wrong or have forgotten??:(:(:(
thanks in advance
lg
pat

One thing I have forgotten - I have also copied the mysql-connector-java-3.1.11-bin.jar in the WebRoot\WEB-INF\lib directory of my EasyStruts WebApplication.
Can anything else be wrong??:(:((
regards

A database connection in a swing application

hi ,
i am developping an intranet stabdalone swing application based on a jdbc connection to oracle8i data server.
in fact i am interested in keeping my user authentification encrypted while this connection is done! is there any method to do it ! i read about SSL but is it supported by web application ! i have a client-server simple connection !
please help !

Hello Levi,
You can to do this form:
String appModule = "yourAppmodule";
String config = "yourAppmodule"+ "Local";
ApplicationModule am = Configuration.createRootApplicationModule(appModule, config);
ConnectionMetada cm = am.getTransaction().getConnectionMetadata();
DriverManager.registerDriver(new OracleDriver());
Connection connection = DriverManager.getConnection(cm.getJdbcURL());You can to see this threads:
Retrieve Database Connection
Getting the Connection object out of ApplicationModule
Regards,
Renan

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,

Database connection in a WebDynpro Application - urgent

Hi
I am facing a problem with database connection. I am trying to develop a normal webdynpro application.
I want to retrieve data from a table and show it.
But my query is not giving the expected output. It is not even raising errors.
Please give me an answer
Thanks & regards
Aparnna

Connection con=null;
Statement st=null;
ResultSet rs=null;
public void wdDoInit()
    //@@begin wdDoInit()
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:erdsn","root","enteg123");
st=con.createStatement();
    catch(Exception e){
    //@@end
public void onActiononClickLogin(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActiononClickLogin(ServerEvent)
     String desig=null;
try{
rs = st.executeQuery("select * from Login where Empid like uid and Pword like pw");
    if(rs.next()){
           desig=rs.getString("Designation");
     wdComponentAPI.getComponent().getMessageManager().reportSuccess(desig);
    if(desig.equalsIgnoreCase("Employee")){
          wdThis.wdFirePlugEmpOutPlug();
     else
     wdComponentAPI.getComponent().getMessageManager().reportWarning("Invalid input!");
      }catch(Exception e){

How to access database connection from datatsource in a standalone java ap

My java standalone application wants connection to database with lookup to datasource name which is configured in the oc4j app server.
Please guide me with some ideas to acheieve this.

user510497,
Following sample program requires access to classes in "oc4j.jar" file.
Test environment:
* Server:
+ OC4J stand-alone 10.1.2.0.2
+ Red Hat Enterprise Linux AS release 3
+ Java HotSpot(TM) Client VM (build 1.4.2_08-b03, mixed mode)
+ Oracle Database 10g Release 10.1.0.4.0 - 64bit Production
* Client
+ Microsoft Windows XP Professional Version 2002 Service Pack 2
+ Java HotSpot(TM) Client VM (build 1.5.0_08-b03, mixed mode, sharing)
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class DataSrc2 {
public static void main(String[] args) {
    Connection conn = null;
    Properties l_props = new Properties();
    l_props.put(Context.INITIAL_CONTEXT_FACTORY,
                "com.evermind.server.rmi.RMIInitialContextFactory");
    l_props.put(Context.PROVIDER_URL, "ormi://your_OC4J_host/");
    l_props.put(Context.SECURITY_PRINCIPAL, "your_OC4J_user");
    l_props.put(Context.SECURITY_CREDENTIALS, "your_OC4J_password");
    Context l_jndiContext = null;
    try {
      l_jndiContext = new InitialContext(l_props);
      Object l_obj = l_jndiContext.lookup("default-data-source");
      DataSource ds = (DataSource) l_obj;
      conn = ds.getConnection("scott","tiger");
      DatabaseMetaData dbmd = conn.getMetaData();
      System.out.println(dbmd.getDatabaseProductVersion());
    catch (NamingException x_naming) {
      x_naming.printStackTrace();
    catch (SQLException xSql) {
      xSql.printStackTrace();
    finally {
      if (l_jndiContext != null) {
        try {
          l_jndiContext.close();
        catch (NamingException x_naming) {
          System.err.println("Failed to close JNDI context.");
          x_naming.printStackTrace();
      if (conn != null) {
        try {
          conn.close();
        catch (SQLException xSql) {
          System.err.println("Failed to close [database] connection.");
          xSql.printStackTrace();
}NOTES:
1. Datasource lookup name is value of "default-data-source" attribute of "orion-application" element in file:
<OC4J_HOME>/j2ee/home/config/application.xmlGood Luck,
Avi.

How database connection pooling works in a application

Hi Guys,
I am new to Java and looking into best way of doing J2ee database conectivity. I am using Eclipse galileo3.5 J2EE with Mysql database and Tomcate 6.0.
I am developing an email application where I need to implement MVC model for my webapplication, using jsp for presentation, servlet for control and java beans for model.
I came across two tutorial for database connection pooling as given below.
Eclipse Corner Article: Creating Database Web Applications with Eclipse - In this tutorial connection pooling is configure in Tomcate 6.0
It says Copy and paste the following into your context.xml file (you may have to click on the Source tab at the bottom of the editor to be able to paste). This defines a DataSource with the name "jdbc/SampleDB". Our application will retrieve database connections from the pool using this name.
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource name="jdbc/SampleDB" auth="Container"
type="javax.sql.DataSource"
username="app" password="app"
driverClassName="org.apache.derby.jdbc.ClientDrive r"
url="jdbc:derby://localhost:1527/sample"
maxActive="8" />
</Context>
Where as in second tutorial - http://www.roseindia.net/answers/viewanswers/2838.html
It uses java bean for connection pooling and then use straight way in JSP and no Servlet used.
conpool.jsp
<%@page import="java.sql.Connection"%>
<jsp:useBean id="pl" class="com.CoreJava.ConnectionPooling"/>
<% Connection con = pl.getConnection(); %>
//do something using con
connectionPooling.java
import com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolD ataSource;
public class ConnectionPooling
static Connection con=null;
public static Connection getConnection()
try
MysqlConnectionPoolDataSource po=new MysqlConnectionPoolDataSource();
po.setServerName("localhost");
po.setPortNumber(3306);
po.setDatabaseName("mydatabase"); //changeur database name
po.setUser("root");//ur username
po.setPassword("");//ur password
con = po.getConnection();
catch(Exception e)
System.out.println("Exception Connection :"+e);
return con;
Please some one explain which is the best way of doing connection pooling to the database by using MVC pattern
Please if some one advise me how to use MVC architecture for simple email application and database connectivty.
Thanks

>
>
Where as in second tutorial - http://www.roseindia.net/answers/viewanswers/2838.html
Never EVER use roseindia. It is terrible shit.
[http://balusc.blogspot.com/2008/06/what-is-it-with-roseindia.html]
The correct answer is what you found in the eclipse article. And you can read the Tomcat docs for more.
As per usual the code you have posted from Roseindia is a big pile of rubbish that was written by a complete idiot. I mean the person who wrote it apparently doesn't know much Java at all. Let alone JDBC. Or Connection pools. Or J2EE. It's not the worst I've seen from them but it's pretty bad.

Problem in getting the database connection from a connection pool

Hai All,
I am facing a problem in getting the database connection from a connection pool created on weblogic server 8.1.
I am using the Oracle database 8.1.7.
I have configured my connection pool, datasource and JNDI in weblogic.
In my java program i have the following code to retrieve the connection.
import java.sql.*;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.InitialContext;
class jdbcshp1 {
    public static void main(String[] args) {
     Connection connection = null;
     try {
           Hashtable ht = new Hashtable();
           ht.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory"); // Wanna get rid of this.
           ht.put(Context.PROVIDER_URL,"t3://localhost:7001"); // wanna get rid of this.
           // Get a context for the JNDI look up
           Context ctx = new InitialContext(ht);
        javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("myjndi1");
          //Create a connection object
          connection = ds.getConnection();
     The above code is working fine but, the two ht.put statements are creating problem.
The problem is, after converting the application into WAR file it can be deployed
on any machine or different port on same machine. My application fails if its deployed on
weglogicserver which is at different port.
Is there any way that i can get rid of those ht.put statements or any other way to solve the problem.
any help is appreciated.
Thanks in advance
Pooja.

Hai All,
Firstly, thanks for ur reply.
Even i have seen some code which uses context constructor with out any parameter and works fine.
i dont understand why its not working for my code.
When i remove those ht.put code and use context constructor with out any parameter, it giving an error.
Context ctx = new InitialContext();
javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("ocjndi");
connection = ds.getConnection();The error is as follows:
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
the above error is forcing me to include those code but if the port number is changed the code will not work. Plz let meknow if some setting have to be made.
I appreciate all ur valuable help.
Thanks once again.
Pooja.

Database Connection Hangs - getConnection()

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