Java Connection Pooling

I want to know what is the procedure of getting oracle's jdbc connection pooling api(class files and java doc).
I also want to know whether it is free or not

ftp://javaexchange.com/javaexchange/DbConnectionBroker1.0.13.tar
from http://javaexchange.com/ by Mark Mnich
Initialise the pool in a startupservlet, place a reference to it in the servlet context (ServletContext.setAttribute(String name, Object myDbPool))
This one is really easy to use and very efficient indeed (endorsed by author David Harms).
It doesn't support multiple databases.
Maybe two pools would be just as effective? The whole point of a connection pool is that the connections within it are constantly open... so you would still have (for example) 25 connections to one database and 25 to the other - constantly. Making unused connections disconnect and connect to the other database would defeat the point, each servlet instance may as well establish its own connection So why not have two pools???
Bamkin

Similar Messages

Java Connection Pooling issue with Oracle 10g Express Edition

Hello
I have a Java based web application that uses the Oracle 10g Express Edition database. I am using a connection pool to get connections to the database.
I use the NetBeans IDE and run my web application on the bundled Tomcat server(5.5.7) that comes with the IDE. Though when I initially run the application from the IDE, the connection pool is set up fine, when I recompile my java code and try to run the application again, I get the following error each time:
Listener refused the connection with the following error:
ORA-12516, TNS:listener could not find available handler with the
matching protocol stack.
The logs before the error shows up, indicate that the connection pool object is fine and gives me the number of available connections and the number of active connections and so on, which I have printed from the constructor of the Connection Pool class:
For e.g.:
Cache size = 17
Available Connections = 17
Cache Limit = 1000
Active size = 0
However, if I kill my Tomcat server process and run the application again, it works fine with no error.
I looked around for possible causes and solutions and all I could find
was increasing the processes parameter value in the init.ora file. I have increased the parameter value to from 100 to 20000 now, in increments of 500/1000 each time but it hasnt worked so far.
Someone else suggested that I increase the size of my connection pool; I initially had it set to a minimum limit of 5, an initial limit of 10 and a maximum limit of 1000. However if I set the Initial Limit to anything above 17 connections, I see the following log on the Bundled Tomcat log and my application doesn't run at all:
Log: Loading JDBC Driver : class=oracle.jdbc.driver.OracleDriver ...
Log: Loaded JDBC Driver
Log: Connection with URL=jdbc:oracle:thin:@localhost:1521:xe as username/password
Error code not handled : 0
Exception Message :java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS: no appropriate service handler found
The Connection descriptor used by the client was:
localhost:1521:xe
// End of log
And the Bundled Tomcat server automatically shuts down.
Again the System.out statements from the Connection Pool class constructor show that the cache has been initialized and that currently there are free connections available in the pool.
E.g.
Cache size = 18
Available Connections = 18
Cache Limit = 1000
Active size = 0
Has anyone faced anything similar? Could someone please suggest what I'm doing wrong here and what I should do to set right this problem?
Swetha

hello, please pardon me, my english is basic. i do of my best. i had the same problem until reading the pdf documentation 2 days for java devvelloper.it is simple, follow this way.
try {OracleDataSource ds;
Connection conn;
ds = new OracleDataSource();
ds.setURL("jdbc:oracle:thin:@localhost");
conn = ds.getConnection("userid","password");
Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
don't forget to Dowload the user client of oracle Express Edition. do the rest of your program and it will work. take a look to the documentation pdf for java develloper. all it is explained. good look

Database connection pools

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Is it beneficial to use JNDI with DBCP? Can I simply use the BasicDataSource as below?
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ds.setDriverClassName(�com.mysql.jdbc.Driver�);
ds.setUrl(�jdbc:mysql://localhost/ispmanager�);
ds.setUsername(�scott�);
ds.setPassword(�jp�);
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Hi Everyone,
i have configured a connection pool on JBoss as per JCo3 Documentation and is working great.
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Any help will be appreciated.
Thanks,
Divyakumar Jain

Eason, 你好！
I have exactly the same problem. Did you find a solution to this problem? If so, please let me know!

How to Create a connection pool in OSB java callout

Dear Team,
In our project, we need read some data from DB, and do corresponding operation. currently, we need setup the connection first, execute the SQL, and close the connection.
But the concurrency of call is very high, is there a way to create a connection pool, then we can use the connection pool to get the connection and execute the SQL, then return the connection to the pool.
if connection pool is not available, is there any way to create the connection outside the java callout, that we can just execute the SQL in java callout.
The OSB version is 11.1.1.6.0
Thanks.
Best Regards,
Raysen Jia
Edited by: Raysen Jia on Oct 16, 2012 8:44 AM

Hi Team,
Thanks for your help.
What I need is not only the db connection, may be other kind of things, such as read configuration from file...
If I write the code in java callout with static java method to create and close the connection, each time when request come in, OSB will create a new connection (or read the file), I think it's not the best practice to do this kind of work.
I think the weblogic is running in JVM, is there any way we can define variables or new object in the JVM directly?

Connection Pooling in Core Java Application

I need to implement Connection pooling in core java applications..
My database is MySQL 5.0.27 and java version 1.5.0_09
Any links or ideas will be really appreciated

but i just wanted to know, how can i do that in core java application. i have used connection pooling in Tomcat using dbcp
but these are my questions.
1. How can i run a core java application doing TCP connection in an Application Server which has got Tomcat and i'm asked to do connection pooling in the Tomcat server.xml.. I didn't understand this requirement pls help me... plssssssssssss

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)
    long connectTime=0, connectionStart=0, connectionStop=0;
    long connectTime2=0, connectionStart2=0, connectionStop2=0;
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    connectionStop = System.currentTimeMillis();
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      ResultSet rset = stmt.executeQuery(query);
      while (rset.next()) {
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        System.out.println("Job:    " + rset.getString(2));
        System.out.println("Salary: " + rset.getString(3));
      stmt.close();
      rset.close();
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      connectionStart2 = System.currentTimeMillis();
      conn = cm.getConnection("KING");
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      while (rset.next()) {
        System.out.println("Name:   " + rset.getString(1));
        System.out.println("Job:    " + rset.getString(2));
        System.out.println("Salary: " + rset.getString(3));
      stmt.close();
      rset.close();
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    connectTime2 = (connectionStop2 - connectionStart2);
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                        connectTime2 + " ms.");
}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'.

Regarding connection pooling in java mail

Hi,
Im implementing enterprise application which has ability of sending/receiving emails. Im using java mail API 14.3. I have implemented the application level connection pooling which keep track of open folders, perform the time-out and other tasks. The connection pooling setting of IMAPStore is default setting. When we run our application in high load we get StoreClosedExcepton (Socket closed exception). My assumption is that when we perform some operation on folder, java mail also sends the noop command for store connection so there is no chance of store getting timeout.
Is there anything wrong in my understanding?

JavaMail does not do anything to keep the connection "alive". Servers are free to close
connections that have been unused for too long (usually 30 minutes). If you need to
keep the connection alive, you'll need to do some operation periodically, such as checking
the number of messages in the folder. Even that doesn't guard against server or network
failures, of course, so you always have to be prepared for a StoreClosedException or
FolderClosedException.

Set up DB Connection Pool for Oracle DataBase Using Java App Server8

Hi,
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Operation 'pingConnectionPool' failed in 'resources' Config Mbean. Target exception message: Connection could not be allocated because: No suitable driver
I don't understand what else I should do and why this error is coming?
Please help me out.
Thank you
Regards,
Sarah

Hi,
I've already solve the problem. I did the following:
set the Url to be: jdbc:oracle:thin:@hostname:port:SID
set username
set password
add oracle.jdbc.drivers.OracleDriver into the JVM options -Djdbc.drivers
restart the server
test the connection
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How can I implement the connection pool in my java stored procedure

my java stored procedures (in database 'B') have to connect to another oracle database ,let's say 'A'. And how can I implement the behavior like the so-called connection pool in my java stored procedure in 'B', as below.
1. database B, has 2 java stored procedures sp1 and sp2
2. both sp1 and sp2 connects to databse 'A'
whatever I call the sp1 and sp2 and the database 'A' always only one connected session from sp1 and sp2 in database 'B'.
THANKS A LOTS...

my problem is I have a lots of java stored procedures need to cnnect to the remote oracle db, and I hope the remote db can only have a connected session from my java stored procedures in my local db. I try as below
class sp{
static Connection conn=null; //the remote db connection,
public static void sp1(){...}//procedure 1, using conn
public static void sp2(){...}//procedure 2, using conn,too
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To connect to the remote db from the java stored procedure is easy but is it possible to connect to the remote db via database link from the java stored procedure at my local db ? If so, then I also archive my goal .
BTW , thanks a lots...
andrew :-)

How to make Connection Pooling in JAVA

Dear Members
I want to know that how can i make connection pooling in java and also how can i use that pool in my jsp/servlet application.
Plz Describe in Detail.
Thanks
Vasim

vasim_saiyad2000 wrote:
Dear Members
I want to know that how can i make connection pooling in java and also how can i use that pool in my jsp/servlet application.
Plz Describe in Detail.
Thanks
VasimAs the previous poster is trying to suggest, the server you use will have datasource and connection pooling support. so look up in the manual how to set it up, or do a google search. For example if you use Tomcat, look here:
http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html

Java Pet Store and connection pooling

Hi. Does the Java Petstore version 1.2 use connection pooling? I know in the database.properties file it has the following variables:
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Pool.MaximumIdleConnections=5
Pool.MaximumCheckoutTime=120000
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Pool.PingEnabled=false
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Thanks in advance,
Dylan

I forgot to mention that I'm using the Ibatis version of the JPetstore.

Database connection pool to stand alone java class

Hi all,
I would like to know the best way to use a database connection pool with a stand alone java class.
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Can enyone help me with this beginner question?
Best regards.

I tried to find the pool class I created but it must be on another CD. Anyway, you can easily create a number of connections and place them on a stack (your own or java's). When you need one, pop it off. When you are finished, push it back.
Good luck.

Java Documentation to Connection Pooling?

Hello,
is there any Java API documentation to the Connection Pooling available? It is not listed in the SP03-Docu, but the classes exist. I don't know how to use them, so any help would be appreciated.
Ah, and the Weblogs by Uri Katz are good, but not applicable in my case. I would like to mount a standalone HTTP server on my computer managing the connections to MDM.
Thanks in advance,
Jörg Thiesmann

I too would like to see more documentation and a simple working example of this ever so useful functionality ;}

Connecting Pooling using Java Servlets

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Please let me know where i will get it or do post it.

If you mean JDBC connection pools, one solution can be found here - http://www.javaexchange.com
Chuck

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