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From Martin Dyulgerov <>
Subject Re: DBCP problem with idle object
Date Mon, 01 Dec 2008 18:02:44 GMT
Hello Clark!

Yes, i am pretty sure MySQL is configuret with amaximum of 100 active 
connections,here is the last row of the result givenby the querry which 
shows my active connections at the time:
*************************** 56. row ***************************
     Id: 1418489
   User: <my userhere>
   Host: <host:port>
     db: <my database>
Command: Query
   Time: 0
  State: Writing to net
   Info: SET NAMES cp1251
56 rows in set (0.00 sec)

There are only 56 connectionsand not all of them are forthe problematic 
application i am talking about. Why do i have to increase the number of 
connections, if there is only one user of the application - 
myselftesting it? I'll try and remove the OnReturn and testWhileIdle, 
thanks forthe suggestion. But i don't think this is the problem. Thanks 
again anyway.

Wish You all best!


Wes Clark wrote:
> You say you might have up to 100 active connections, but you only
> configure for 15.  Are you sure you don't just need to increase the
> number of active connections?  Also, if you test of borrow, I don't
> think you need to test on return or test on idle. 
> -----Original Message-----
> From: Martin Dyulgerov [] 
> Sent: Monday, December 01, 2008 9:18 AM
> To:
> Subject: DBCP problem with idle object
> Hello group!
> This is the first time i actuali write something in here. First of all -
> please excuse my bad english, it is not my native language. Now to get
> to the point... I have problems implementing DBCP on my Tomcat 6.0.18 in
> my web applications. I don't want to use JNDI, that is why i have
> ServletContextListener, in witch i do as follows in order:
> 1.Define GenericObject Pool
> 2. Define ConnectionFactory as implementation of
> DriverManagerConnectionFactory 3.Define PoolableConnectionFactory with
> the previously created GenericObjectPool and ConnectionFactory 4.Define
> PoolingDataSource with the GenericObjectPool object from step 1
> Then i "stick" my PoolingDataSource to the servlet context, retreive it
> in my JSPs and servlets and aquire a connection via "getConnection()" 
> (which returns Connection object). I make sure to close() all my
> connections at the edn of the pages...I am sure that the connections
> that are opened dont exceed the number 100 (which is the maximum number
> of connections on my database - a MySQL database system), so i think
> there must be something wrong with my pooling code. The exact error i
> get is:
> "Exception: Cannot get a connection, pool error Timeout waiting for idle
> object SQL Exception Connection is closed. SQLException Connection is
> closed." At some point i began to ask myself if it the problem is caused
> by the restarts(reloads) i do for that exact application, because the
> other work fine (byt i dont play with them that much)... My
> configurations for the GenericObjectPool and
> DriverManagerConnectionFactory are as follows:
> GenericObjectPool.Config config=new GenericObjectPool.Config();
>             config.maxActive=15;
>             config.maxIdle=10;
>             config.minIdle=5;
>             config.maxWait=3000;
>             config.testOnBorrow=true;
>             config.testOnReturn=true;
>             config.testWhileIdle=true;
>             config.timeBetweenEvictionRunsMillis=1000;
>             config.minEvictableIdleTimeMillis=1000;
> Properties p=new Properties();
>             p.setProperty("user", user);
>             p.setProperty("password", password);
>             p.setProperty("useUnicode", "true");
>             p.setProperty("characterEncoding", "CP1251");
>             p.setProperty("autoReconnect", "true");
> Can You help me please? Any help will be appriciated. Thanks in advance,
> and accept my apologies if i have breaked some rules of the group or
> something like that.
> All best,
> Martin
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