DataSource misconfigured?
Hello Again Everyone! I know I have already sent out a message or three
about this, but I need to resolve it pretty quickly. I found a work around,
but I would like a sanity check from those of you who really understand this
stuff. I included a method that I wrote to get Connections, You can see the
old and the new along side each other. The "manual" method allows me to
query till the cows come home.. The "Resource" method gives me 12 DB hits on
4.1.18 and 5 on 4.1.24 (tested on both solaris 8 and 9) before it appears to
hang. Oddly enough I can't pinpoint what is hanging because I have added
log statements to this method and it appears to be working.. but
substituting those two lines below removes the issue, so I believe it is
returning an invalid connection or something that I don't understand.
Thanks for any time spent on reading this!
/ Method Start /
public static Connection getConnection () throws Exception {
Connection connection;
try {
/*** Old Version
Context ctx = new InitialContext ();
if ( ctx == null )
throw new Exception ("No Context");
DataSource ds;
ds = (DataSource)ctx.lookup ("java:comp/env/jdbc/CIHDB");
if ( ds != null )
connection = ds.getConnection();
else {
return null;
}//end of else
End of old version */
Class.forName ("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection (
"jdbc:mysql://localhost/cih",
"User","PassWord");
}//end of try
catch ( Exception e ) {
throw (e);
}//end of catch
return connection;
}//end getConnection
/* Web.xml definition
Resource reference to a factory for java.sql.Connection
instance that may be used for talking to a particular
database that is configured in the server.xml file
jdbc/CIHDB
javax.sql.DataSource
Container
/** server.xml
factory
org.apache.commons.dbcp.BasicDataSourceFactory
username
User
password
Password
driverClassName
com.mysql.jdbc.Driver
url
jdbc:mysql://localhost/cih
removeAdandoned
true
removeAdandonedTimeout
120
MaxActive
50
MaxIdle
10
MaxWait
200
Steve Gums
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Re: DataSource misconfigured?
Are you using a finally bock to close your connections? You might be
reaching the maximum connections allowed in the pool for DBCP. Please
provide an example of a query statement where you do try/catch/finally. If
you are not checking if your connections are not null and then making a
last ditch attempt to close them in the finally block, then that may very
well be the problem.
Also, your URL should have "?autoReconnect=true" appended to the "url"
value since you are using MySQL.
Jake
At 10:29 PM 3/31/2003 -0700, you wrote:
Hello Again Everyone! I know I have already sent out a message or three
about this, but I need to resolve it pretty quickly. I found a work around,
but I would like a sanity check from those of you who really understand this
stuff. I included a method that I wrote to get Connections, You can see the
old and the new along side each other. The "manual" method allows me to
query till the cows come home.. The "Resource" method gives me 12 DB hits on
4.1.18 and 5 on 4.1.24 (tested on both solaris 8 and 9) before it appears to
hang. Oddly enough I can't pinpoint what is hanging because I have added
log statements to this method and it appears to be working.. but
substituting those two lines below removes the issue, so I believe it is
returning an invalid connection or something that I don't understand.
Thanks for any time spent on reading this!
/ Method Start /
public static Connection getConnection () throws Exception {
Connection connection;
try {
/*** Old Version
Context ctx = new InitialContext ();
if ( ctx == null )
throw new Exception ("No Context");
DataSource ds;
ds = (DataSource)ctx.lookup ("java:comp/env/jdbc/CIHDB");
if ( ds != null )
connection = ds.getConnection();
else {
return null;
}//end of else
End of old version */
Class.forName ("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection (
"jdbc:mysql://localhost/cih",
"User","PassWord");
}//end of try
catch ( Exception e ) {
throw (e);
}//end of catch
return connection;
}//end getConnection
/* Web.xml definition
Resource reference to a factory for java.sql.Connection
instance that may be used for talking to a particular
database that is configured in the server.xml file
jdbc/CIHDB
javax.sql.DataSource
Container
/** server.xml
factory
org.apache.commons.dbcp.BasicDataSourceFactory
username
User
password
Password
driverClassName
com.mysql.jdbc.Driver
url
jdbc:mysql://localhost/cih
removeAdandoned
true
removeAdandonedTimeout
120
MaxActive
50
MaxIdle
10
MaxWait
200
Steve Gums
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: DataSource misconfigured?
Thanks Jacob!
My problem was an unsuccessful close on one of my major servlets. Just a
lame oversight on my part that caused a large headache. So for everyone
else...REMEMBER to close your connections!
Steve
-Original Message-
From: Jacob Kjome [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 01, 2003 7:39 AM
To: Tomcat Users List
Subject: Re: DataSource misconfigured?
Are you using a finally bock to close your connections? You might be
reaching the maximum connections allowed in the pool for DBCP. Please
provide an example of a query statement where you do try/catch/finally. If
you are not checking if your connections are not null and then making a
last ditch attempt to close them in the finally block, then that may very
well be the problem.
Also, your URL should have "?autoReconnect=true" appended to the "url"
value since you are using MySQL.
Jake
At 10:29 PM 3/31/2003 -0700, you wrote:
>Hello Again Everyone! I know I have already sent out a message or three
>about this, but I need to resolve it pretty quickly. I found a work
around,
>but I would like a sanity check from those of you who really understand
this
>stuff. I included a method that I wrote to get Connections, You can see
the
>old and the new along side each other. The "manual" method allows me to
>query till the cows come home.. The "Resource" method gives me 12 DB hits
on
>4.1.18 and 5 on 4.1.24 (tested on both solaris 8 and 9) before it appears
to
>hang. Oddly enough I can't pinpoint what is hanging because I have added
>log statements to this method and it appears to be working.. but
>substituting those two lines below removes the issue, so I believe it is
>returning an invalid connection or something that I don't understand.
>
>Thanks for any time spent on reading this!
>
>/ Method Start /
>public static Connection getConnection () throws Exception {
>
> Connection connection;
> try {
> /*** Old Version
> Context ctx = new InitialContext ();
> if ( ctx == null )
> throw new Exception ("No Context");
> DataSource ds;
> ds = (DataSource)ctx.lookup ("java:comp/env/jdbc/CIHDB");
> if ( ds != null )
> connection = ds.getConnection();
> else {
>return null;
> }//end of else
> End of old version */
> Class.forName ("com.mysql.jdbc.Driver").newInstance();
> connection = DriverManager.getConnection (
> "jdbc:mysql://localhost/cih",
> "User","PassWord");
> }//end of try
> catch ( Exception e ) {
> throw (e);
> }//end of catch
> return connection;
>}//end getConnection
>
>/* Web.xml definition
>
>
> Resource reference to a factory for java.sql.Connection
> instance that may be used for talking to a particular
> database that is configured in the server.xml file
>
> jdbc/CIHDB
> javax.sql.DataSource
> Container
>
>
>/** server.xml
> reloadable="true" crossContext="true">
>
>prefix="localhost_CIH." suffix=".txt"
>timestamp="true"/>
>
> auth="Container"
> type="javax.sql.DataSource"/>
>
>
>
> factory
>
>org.apache.commons.dbcp.BasicDataSourceFactory
>
>
> username
> User
>
>
> password
> Password
>
>
> driverClassName
> com.mysql.jdbc.Driver
>
>
> url
> jdbc:mysql://localhost/cih
>
>
> removeAdandoned
> true
>
>
> removeAdandonedTimeout
> 120
>
>
> MaxActive
> 50
>
>
> MaxIdle
> 10
>
>
> MaxWait
> 200
>
>
>
>
>Steve Gums
>
>
>-
>To unsubscribe, e-mail: [EMAIL PROTECTED]
>For additional commands, e-mail: [EMAIL PROTECTED]
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