How to dump connection pooling stats?

OK, since the forum search is not working, can someone post the link or code to dump the connection pooling stats?
Thanks
Sam

Hi,
Assuming that you are using BC4J and assuming that you are using BC4J's connection pool implementation (default if you have specified a JDBC URL connection type in your configuration) then you can dump connection pool statistics by executing something like the following (9.0.2) on the server tier after the first AM connection has been established:
import oracle.jbo.server.*;
import oracle.jbo.pool.*;
import java.util.Enumeration;
      ResourcePoolManager mgr = (ResourcePoolManager)ConnectionPoolManagerFactory.getConnectionPoolManager();
      Enumeration keys = mgr.getResourcePoolKeys();
      while (keys.hasMoreElements())
         Object key = keys.nextElement();
         System.out.println("Dumping statistics for connection pool: " + key);
         ResourcePool cPool = (ResourcePool)mgr.getResourcePool(key);
         cPool.dumpPoolStatistics(new java.io.PrintWriter(System.out, true));
If you are not using BC4J or are using a JDBC DataSource then you will have to consult the documentation for that DataSource.
Hope this helps.
JR

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I spent many hours when i first implemented connection pooling trying to put it together. The information is scattered and the config has changed slightly from 5.0 to 5.5 etc. This is how I got it working in 5.5.17:
* server.xml seems to be a wrong place for the pool configuration if you consider it to be an application specific thing. It might be a better idea to put it into C:\tomcat55\conf\Catalina\localhost\ConfigFileForYourWeapp.xml as follows:
<Context path="/ClientLink" docBase="C:\eclipseWorkspace\PortfolioUI3\WebRoot">
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Message was edited by:
Tomppu

How to compile connection pool sample java code

I recently bought David Knox's "Effective Oracle Database 10g Security by Design", and have been working through his examples with client identifiers and how to leverage database security with anonymous connection pools.
The database side of things I totally understand and have set up, but I now want to compile/run the java code examples, but don't know what is required to compile this.
I'm running Oracle 10.2.0.4 (64-bit) Enterprise Edition on a Linux (RHEL 5) PC. Java version is 1.6.0_20. Relevant .bash_profile environment variables are as follows:
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
export CLASSPATH=$ORACLE_HOME/jre:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib
export PATH=$ORACLE_HOME/bin:$ORACLE_HOME/OPatch:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin
When I try to compile, I get:
oracle:DB10204$ java FastConnect.java
Exception in thread "main" java.lang.NoClassDefFoundError: FastConnect/java
Caused by: java.lang.ClassNotFoundException: FastConnect.java
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: FastConnect.java. Program will exit.
The java source code of one of the examples is below. Is someone able to point me in the right direction as to how I get this to compile? Do I just have a syntax and/or environment configuration modification to do, or is there more to it than that to get this example working? Any help much appreciated.
oracle:DB10204$   cat FastConnect.java
package OSBD;
import java.sql.*;
import oracle.jdbc.pool.OracleDataSource;
public class FastConnect
public static void main(String[] args)
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}Code download is at: http://www.mhprofessional.com/getpage.php?c=oraclepress_downloads.php&cat=4222
I'm looking at Chapter 6.

stuartu wrote:
When I try to compile, I get:
oracle:DB10204$ java FastConnect.java
Exception in thread "main" java.lang.NoClassDefFoundError: FastConnect/java
Caused by: java.lang.ClassNotFoundException: FastConnect.java
I will try to explain what is happening here.
You are launching java telling it to run a class named 'java' in a package named 'FastConnect'
and java says it cannot find that class.
What you intended to do:
$ # make the directory structure match the package structure
$ mkdir OSBD
$ # move the source file in the directory structure so it matches the package structure
$ mv FastConnect.java OSBD/
$ # compile OSBD/FastConnect.java to OSBD/FastConnect.class
$ javac OSBD/FastConnect.java
$ # launch java using the OSBD/FastConnect class
$ java -cp . OSBD.FastConnectNote that the package 'OSBD' does not follow the recommended naming conventions
you might consider changing that to 'osbd'.

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Hi
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Hi
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Cheers
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U can use a Simple Java Code for that: http://jaysensharma.wordpress.com/2010/02/19/jdbcconnectionpool-parameters-using-jmx/
In the above program you need to just change the following 4-lines:
int port = 7001; // AdminServer Port
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====================================
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Hi,
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http://www.oracle.com/technology/tech/java/newsletter/articles/oc4j_data_sources/oc4j_ds.htm
http://www.oracle.com/technology/products/jdev/tips/duff/mysql_and_oc4j3.html

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hi
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* <P>
* Taken from Core Servlets and JavaServer Pages
* from Prentice Hall and Sun Microsystems Press,
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* © 2000 Marty Hall; may be freely used or adapted.
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      // to free up.
// This explicitly makes a new connection. Called in
// the foreground when initializing the ConnectionPool,
// and called in the background when running.
public Connection makeNewConnection()
      throws SQLException {
    try {
      // Load database driver if not already loaded
      Class.forName(driver);
      // Establish network connection to database
      Connection connection =
        DriverManager.getConnection(url, username, password);
      return(connection);
    } catch(ClassNotFoundException cnfe) {
      // Simplify try/catch blocks of people using this by
      // throwing only one exception type.
      throw new SQLException("Can't find class for driver: " +driver);
public synchronized void free(Connection connection) {
    busyConnections.removeElement(connection);
    availableConnections.addElement(connection);
    // Wake up threads that are waiting for a connection
    notifyAll();
public synchronized int totalConnections() {
    return(availableConnections.size() +
           busyConnections.size());
/** Close all the connections. Use with caution:
   * be sure no connections are in use before
   * calling. Note that you are not <I>required</I> to
   * call this when done with a ConnectionPool, since
   * connections are guaranteed to be closed when
   * garbage collected. But this method gives more control
   * regarding when the connections are closed.
public synchronized void closeAllConnections() {
    closeConnections(availableConnections);
    availableConnections = new Vector();
    closeConnections(busyConnections);
    busyConnections = new Vector();
public void closeConnections(Vector connections) {
    try {
      for(int i=0; i<connections.size(); i++) {
        Connection connection =
          (Connection)connections.elementAt(i);
        if (!connection.isClosed()) {
          connection.close();
    } catch(SQLException sqle) {
      // Ignore errors; garbage collect anyhow
public synchronized String toString() {
    String info =
      "ConnectionPool(" + url + "," + username + ")" +
      ", available=" + availableConnections.size() +
      ", busy=" + busyConnections.size() +
      ", max=" + maxConnections;
    return(info);
}///// The Calling Class is below---------/////////////////
import java.util.*;
import java.sql.*;
public class dbConnection
     public static void main(String[] args)
          String driver="oracle.jdbc.driver.OracleDriver";
          String username="ETS";
          String password="ETS";
          String url="jdbc:oracle:thin:@192.168.47.10:1521:ETS";
          int initialConnections=10;
        int maxConnections=50;
          boolean waitIfBusy=false;
          Connection con=null;
          Statement stmt = null;
          ResultSet rs = null;
          try
          System.out.println("Before constructory "+new java.util.Date());
          ConnectionPool pool=new ConnectionPool(driver,url,username,password,initialConnections,maxConnections,waitIfBusy);
          System.out.println("After constructory "+new java.util.Date());
                    con=pool.makeNewConnection();
     System.out.println("After Connection pool "+new java.util.Date());
                    String sql="select * from emp_master";
                    stmt = con.createStatement();
                    rs = stmt.executeQuery(sql);
                    while(rs.next()) {
               int login1=rs.getInt("emp_code");
                    System.out.println("Employee Code is "+login1);
                    System.out.println("check 2");
               String pass=rs.getString("PASSWORD");
                    System.out.println("Pass Word is "+pass);
          }catch(Exception e)
               System.out.println("Exception is "+e);
          finally {
}

I once created a connection pool programatically with Apache DBCP API. It didnt took more than 10 lines. Unforchunetly I dont have to code with me now.
But If I remember right there is a sample code for that in the Apache Commans DBCP documentation.

How to use connection pool of datasource to make applications run faster?

Hi, erveryone
I prepare to implement a servlet that access database and do sync with client.
When I access database, I would like to configure a datasource in weblogic and use connection pool.
In order to make servlet application run significantly faster, my servet how to use connection poo is much moreresonable?
For example, my servlet has many times database access. Is it true that geting and close a connection whenever
one time database access finished?
If from the servlet begins, the db connection is hold till servlet finalize. Will the solution affect the servlet performance? Is there any official document to introduce connection pool program? I search some documents.
<The Java EE 6Tutorial> introduce some simple intruduction about connection pool.

1. Use WebLogic Servers Data Source for Database Connections.
2. Open and close the connections where you need it. Dont open it in begin and close in finalise. That is bad practice.
3. Even when you invoke Connection.close () webLogic will not close the connection. it will commit the transaction and return it back to the pool rather than physically closing the DB connection.
4. You can tune data source for minimum, maximum and increments of connections that you need based on your application requirement.

How to dump connection pooling stats?

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