MySQL connection pooling guidelines

Dear tribe,
Although using autoReconnect=true in my pool definition, I keep running out of connections...
This morning changed to autoReconnectForPools=true flag (along with autoReconnect) and upgraded to Connector/J 3.0.11.
While I'm waiting to see if this will work out, can someone please point to some guidelines on setting up connection pools specifically for MySQL and AppServer7 or post a working configuration (jar versions, web.xml fragment etc)?
Thanks,
Manos

My initial configuration was exactly that but was failing to connect after leaving the applicatin running for 8 hours. I then added autoReconnect=true and autoReconnectForPools=true. But after leaving the application running without any requests to it, this morning i tried to load a page and got closed connection errors again...
javax.servlet.ServletException: Could not execute query
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:478)
     at jasper.monthly_jsp._jspService(_monthly_jsp.java:524)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at gr.netsmart.manos2.jstats.filters.WebStatisticsKeeper.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
Root Cause
net.sf.hibernate.JDBCException: Could not execute query
     at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1478)
     at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
     at jasper.monthly_jsp._jspService(_monthly_jsp.java:158)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at gr.netsmart.manos2.jstats.filters.WebStatisticsKeeper.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
Caused by: java.sql.SQLException: No operations allowed after connection closed.
Connection was closed due to the following exception:
** BEGIN NESTED EXCEPTION **
java.sql.SQLException
MESSAGE: Communication link failure: java.io.EOFException, underlying cause: null
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1319)
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1463)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1854)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1109)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1203)
     at com.mysql.jdbc.MysqlIO.sqlQuery(MysqlIO.java:1164)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2087)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2049)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2030)
     at com.mysql.jdbc.Connection.rollbackNoChecks(Connection.java:3004)
     at com.mysql.jdbc.Connection.rollback(Connection.java:1458)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.getCurrentConnection(JdbcXAConnection.java:640)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.prepareStatement(JdbcXAConnection.java:378)
     at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:228)
     at net.sf.hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:61)
     at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:703)
     at net.sf.hibernate.loader.Loader.doQuery(Loader.java:184)
     at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132)
     at net.sf.hibernate.loader.Loader.doList(Loader.java:949)
     at net.sf.hibernate.loader.Loader.list(Loader.java:940)
     at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:833)
     at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1475)
     at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
     at jasper.monthly_jsp._jspService(_monthly_jsp.java:158)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at gr.netsmart.manos2.jstats.filters.WebStatisticsKeeper.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
** END NESTED EXCEPTION **
STACKTRACE:
java.sql.SQLException: Communication link failure: java.io.EOFException, underlying cause: null
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1319)
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1463)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1854)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1109)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1203)
     at com.mysql.jdbc.MysqlIO.sqlQuery(MysqlIO.java:1164)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2087)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2049)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2030)
     at com.mysql.jdbc.Connection.rollbackNoChecks(Connection.java:3004)
     at com.mysql.jdbc.Connection.rollback(Connection.java:1458)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.getCurrentConnection(JdbcXAConnection.java:640)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.prepareStatement(JdbcXAConnection.java:378)
     at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:228)
     at net.sf.hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:61)
     at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:703)
     at net.sf.hibernate.loader.Loader.doQuery(Loader.java:184)
     at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132)
     at net.sf.hibernate.loader.Loader.doList(Loader.java:949)
     at net.sf.hibernate.loader.Loader.list(Loader.java:940)
     at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:833)
     at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1475)
     at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
     at jasper.monthly_jsp._jspService(_monthly_jsp.java:158)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at gr.netsmart.manos2.jstats.filters.WebStatisticsKeeper.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
** END NESTED EXCEPTION **
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1638)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1854)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1109)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1203)
     at com.mysql.jdbc.MysqlIO.sqlQuery(MysqlIO.java:1164)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2087)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2049)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2030)
     at com.mysql.jdbc.Connection.rollbackNoChecks(Connection.java:3004)
     at com.mysql.jdbc.Connection.rollback(Connection.java:1458)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.getCurrentConnection(JdbcXAConnection.java:640)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.prepareStatement(JdbcXAConnection.java:378)
     at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:228)
     at net.sf.hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:61)
     at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:703)
     at net.sf.hibernate.loader.Loader.doQuery(Loader.java:184)
     at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132)
     at net.sf.hibernate.loader.Loader.doList(Loader.java:949)
     at net.sf.hibernate.loader.Loader.list(Loader.java:940)
     at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:833)
     at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1475)
     at net.sf.hibernate.impl.QueryImpl.list(QueryImpl.java:39)
     at jasper.monthly_jsp._jspService(_monthly_jsp.java:158)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at gr.netsmart.manos2.jstats.filters.WebStatisticsKeeper.doFilter(Unknown Source)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
     at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
** END NESTED EXCEPTION **
     at com.mysql.jdbc.Connection.checkClosed(Connection.java:2225)
     at com.mysql.jdbc.Connection.setAutoCommit(Connection.java:501)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.getCurrentConnection(JdbcXAConnection.java:641)
     at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.prepareStatement(JdbcXAConnection.java:378)
     at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:228)
     at net.sf.hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:61)
     at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:703)
     at net.sf.hibernate.loader.Loader.doQuery(Loader.java:184)
     at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:132)
     at net.sf.hibernate.loader.Loader.doList(Loader.java:949)
     at net.sf.hibernate.loader.Loader.list(Loader.java:940)
     at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:833)
     at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1475)
     ... 27 more

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            out.println("<body>");
            out.println("<h1>Servlet DBServlet at " + request.getContextPath () + "</h1>");
            out.println("<br /><br /><br />");
            if(conn!=null)
                out.println("conn object : "+conn);
            out.println("</body>");
            out.println("</html>");
        } catch(Exception sq) {
            System.out.println("Exception" + sq.getMessage());
            out.close();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
     public void destroy() {
     try {
         conn.close();
     } catch (SQLException sqle) {
         sqle.printStackTrace();
    @Override
    public String getServletInfo() {
        return "A Simple Servlet";
}And it work for now.
Edited by: pavlos555 on Oct 21, 2008 10:21 AM

MySQL - Connection Pooling - Driver?

Hi there!
I am looking for a JDBC 2.0 compatible driver to use with MySQL. I would like to use connection pooling in a webapplication (JSP:s and Servlets) but I have just found out that the driver I usually use mmmysql do not support connection pooling. Hence, my question: Where can I find a driver to use with MySQL with support for Connection Pooling?
bw

have you tried resin..
http://www.caucho.com/projects/jdbc-mysql/index.xtp
i haven't checked it yet but it could be an option
i'm currently using mmmysql driver also...I tried that driver and when I had more than one statement open at the same time, it gave me garbage results and then threw an exception. So I'm using the mmmysql driver too.

Error using mySQL connection Pool

I see the following error when my application uses the connection pool - can anyone explain this ?
INFO: CORE3282: stdout: =======================>ERROR :com.sun.enterprise.repository.J2EEResourceException
WARNING: CORE3283: stderr: at com.sun.enterprise.resource.IASNonSharedResourcePool.initPool(IASNonSharedResourcePool.java:416)
WARNING: CORE3283: stderr: at com.sun.enterprise.resource.IASNonSharedResourcePool.internalGetResource(IASNonSharedResourcePool.java:625)
WARNING: CORE3283: stderr: at com.sun.enterprise.resource.IASNonSharedResourcePool.getResource(IASNonSharedResourcePool.java:520)
INFO: CORE3282: stdout: java.lang.NoSuchMethodException: setdataSourceName

Hi,
You have used dataSourceName property while creating a connection pool.This property is not required to be set while creating a connection pool for MySql
Use the following properties:
<property name="serverName" value="<name of server>"
<property name="port" value="<port number>"
<property name="DatabaseName" value="<your db name>"
<property name="User" value="<user name>"
<property name="Password" value="<passwd>"
Get back in case of any issues

MySQL Connection Pooling

Our application uses castor and MySQL. When running in WebLogic, what is the best (portability is key) way to provide a connection pool to my application?
Thanks in advance!
George Redens
Sr. Developer
CertAlert Software, Inc

Do you write the code that obtains your JDBC
connections, or is it embedded in Castor?
If you can write the code that obtains your
jdbc connections, then the standard pool
documentation is what you should follow.
If you do not have direct access to the
code creating your JDBC connections,
tell us how you specify them, and maybe you
can use our pools, and maybe not.
Joe

Toplink Mysql Connection pool issues

I am frequently seeing threads in wait state on toplink connection pool, I have given the stack trace below, anyone has any ideas as to what is happening? is it
related to connection timeout? or other causes...
"http-0.0.0.0-8080-2" id=397 idx=0x620 tid=5344 prio=5 alive, in native, waiting
, daemon
-- Waiting for notification on: oracle/toplink/threetier/ConnectionPool@0x00
F181D8[fat lock]
at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Metho
d)
at java/lang/Object.wait(J)V(Native Method)[optimized]
at java/lang/Object.wait(Object.java:474)
at oracle/toplink/threetier/ConnectionPool.acquireConnection(ConnectionPool.
java:65)
^-- Lock released while waiting: oracle/toplink/threetier/ConnectionPool@0x0
0F181D8[fat lock]
at oracle/toplink/threetier/ServerSession.allocateReadConnection(ServerSessi
on.java:412)
at oracle/toplink/threetier/ServerSession.executeCall(ServerSession.java:443
at oracle/toplink/internal/queryframework/DatasourceCallQueryMechanism.execu
teCall(DatasourceCallQueryMechanism.java:193)
at oracle/toplink/internal/queryframework/DatasourceCallQueryMechanism.execu
teCall(DatasourceCallQueryMechanism.java:179)
at oracle/toplink/internal/queryframework/DatasourceCallQueryMechanism.execu
teSelectCall(DatasourceCallQueryMechanism.java:250)
at oracle/toplink/internal/queryframework/DatasourceCallQueryMechanism.selec
tAllRows(DatasourceCallQueryMechanism.java:583)
at oracle/toplink/internal/queryframework/ExpressionQueryMechanism.selectAll
RowsFromTable(ExpressionQueryMechanism.java:2483)
at oracle/toplink/internal/queryframework/ExpressionQueryMechanism.selectAll
Rows(ExpressionQueryMechanism.java:2441)
at oracle/toplink/queryframework/ReadAllQuery.executeObjectLevelReadQuery(Re
adAllQuery.java:467)
at oracle/toplink/queryframework/ObjectLevelReadQuery.executeDatabaseQuery(O
bjectLevelReadQuery.java:874)
at oracle/toplink/queryframework/DatabaseQuery.execute(DatabaseQuery.java:67
4)
at oracle/toplink/queryframework/ObjectLevelReadQuery.execute(ObjectLevelRea
dQuery.java:835)
at oracle/toplink/queryframework/ReadAllQuery.execute(ReadAllQuery.java:445)
at oracle/toplink/internal/sessions/AbstractSession.internalExecuteQuery(Abs
tractSession.java:2260)
at oracle/toplink/internal/sessions/AbstractSession.executeQuery(AbstractSes
sion.java:1074)
at oracle/toplink/internal/sessions/AbstractSession.executeQuery(AbstractSes
sion.java:1058)
at oracle/toplink/internal/sessions/AbstractSession.executeQuery(AbstractSes
sion.java:1017)
at com/integral/query/QueryServiceC.executeQuery(QueryServiceC.java:1030)
at com/integral/query/QueryServiceC._find(QueryServiceC.java:525)
at com/integral/query/QueryServiceC._findAll(QueryServiceC.java:123)
at com/integral/query/QueryServiceC.findAll(QueryServiceC.java:83)
at com/integral/query/ejb/QueryServiceC.findAll(QueryServiceC.java:59)

Hello,
It looks like you are using a TopLink managed connection pool and do not have enough connections available for the number of threads needing to use one. This results in threads having to wait until one is released from another thread. In the thread shown, it is waiting to get a read connection from the read pool.
TopLink connection pools are described in the docs at:
http://www.oracle.com/technology/products/ias/toplink/doc/1013/main/_html/srvclius002.htm#CHDJAECD
I'd recommend increasing the min/max number of connections to something that is appropriate to handle your peak load based on your applications usage paterns.
Best Regards,
Chris

MySql connection pooling in Tomcat 4.1

Hi,
Could somebody help me before I go insane ?
I have installed Tomcat 4.1 and MySql and is now trying to follow the example at http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html to set up a pooled connection to the database.
When i try to look up the DataSource :
DataSource ds = (DataSource) initCtx.lookup("java:comp/env/jdbc/lonDB");
I get an error :
DbcpDataSourceFactory: driverClassName is required
cheers
/H

Hello,
Even though my problem is different, I just appended to this older posting because I am following the same tutorial for setting up a DB Conn pool with MySql.
The problem that I am having is that Tomcat can't find the DBTest class which I copied and compiled from the tutorial.
Where does one have to place their classes for Tomcat 4.1 to see them? In the older version of Tomcat which we use, all we had to was to place the class directory in the CLASSPATH variable on the server, and Tomcat was able to access the classes. We did the same approach for v4.1 but it does not seem to be working.
Any help is appreciated!
Thanks,
Chris

Replace Quotes, Connection Pooling, and Sun Web Server with MySQL, Oracle

This is code I use to insert data into my MySQL and Oracle databases.
I takes care of quotes and shows use of context, i.e. when you use Sun Web Server's
ConnectionPooling. This code works. Feel free to reply if you have questions on how to set up connection pooling using Sun Web Server 6.1SP - it took quite a long time to learn and I couldn't find much information throughout the web, so I hope this helps...
This is not a question and I am not looking for an answer, but please post comments or suggestions.
dailysun
This is in one class where I have a hashtable containing the
column name / value pairs that I want to enter into my table.
This class simply creates the SQL string from the values in the
hashtable. It then passes that hashtable including the database
name to a class which executes that sql statement (second code
portion).
/* Insert data into sf_parts. Create the column strings from
         * the provided hash table. Be sure to parse out hash elements which
         * are used for the createTemplate process
        StringBuffer values = new StringBuffer();
        StringBuffer fields = new StringBuffer();
        Enumeration keys = fieldHash.keys();
        while(keys.hasMoreElements()){
            Object currentKey = keys.nextElement();
                String fieldValue = (String) fieldHash.get(currentKey);
                if(values.length() >0){
                    values.append(",");
                values.append("'"+fieldValue.replaceAll("'","''")+"'"); // Takes care of quotes and various other special characters!
                if(fields.length() >0){
                    fields.append(",");
                fields.append(currentKey);
        sql = "INSERT INTO myTable (" + fields.toString() + ") VALUES (" + values.toString() + ");";
        String insertResult = caq.getInsertDelete(sql,"myDatabaseName"); // your database name is defined in web.xml and sun-web.xml when you use Sun Web Server's Connection Pooling.
        returnValue += "<br><br><b>Rows inserted into table(myTable): </b>" + insertResult + "<br>\n";
        And, like I describe above, this method executes the sql statement.
     * Takes care of insert, update and delete requests.
     * Must have set both dbName as well as the sql String.
     * Will return number of rows affected as String.
     * @return String Number of rows affected
     * @exception SQLException
     * @exception Exception
    public String getInsertDelete() {
        checkData(); // this simply checks if the variables dbName and sql are not empty ;-)
        InitialContext initContext = null;
        int rv = 0;
        try{
            // Get connection from configured pool
            initContext = new InitialContext();
            source = (DataSource) initContext.lookup("java:comp/env/jdbc/" + dbName); // I have this set up in web.xml and sun-web.xml (I use Sun Web Server 6.1SP which does connection pooling for me)
            conn = source.getConnection();
            if(conn != null){
                stmt = conn.createStatement();
                rv = stmt.executeUpdate(sql);
        }catch (SQLException e){
            // do something
        }catch (Exception e){
            // do something
        }finally{
            try{
                stmt.close();
            }catch(Exception e){
                // do something
            try{
                conn.close();
            }catch(Exception e){
                // do something
            try{
                initContext.close();
            }catch(Exception e){
                // do something
        return rv+"";
    }

This is code I use to insert data into my MySQL and
Oracle databases.
I takes care of quotes and shows use of context, i.e.
when you use Sun Web Server's
ConnectionPooling. This code works. Feel free to
reply if you have questions on how to set up
connection pooling using Sun Web Server 6.1SP - it
took quite a long time to learn and I couldn't find
much information throughout the web, so I hope this
helps...
This is not a question and I am not looking for an
answer, but please post comments or suggestions.Using prepared statements would mean that you wouldn't have to worry about quotes.
You should be closing the result set.
You are handling all fields as strings. That won't work with time fields and might not work for numeric fields.
Presumably most of your variables are member variables. They should be local variables because that is the scope of the usage.
You must do something with the exceptions.
Hashtables although convienent mean that problems with usage can only be resolved at run time rather than compile time.

Has anyone run the connection pooling for mysql & tomcat successfully?

I'm trying to set up connection pooling. I'm following the how-to page at
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
But when i test the DBTest/test.jsp file, tomcat displays an error =
could not load jdbc driver class 'null'(msdos)
i have placed all the required .jar files in the tomcat lib.
below is the cofiguration i did to the server.xml file



<Server port="8005" shutdown="SHUTDOWN" debug="0">

<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"
debug="0"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
debug="0"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>


<Service name="Tomcat-Standalone">


<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="100" debug="0" connectionTimeout="20000"
useURIValidationHack="false" disableUploadTimeout="true" />




<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8009" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="20000"
useURIValidationHack="false"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>











<Engine name="Standalone" defaultHost="localhost" debug="0">



<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>


<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
debug="0" resourceName="UserDatabase"/>







<Host name="localhost" debug="0" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<Context path="/my-jsp" docBase="c:\JSP-Files" debug="0"
privileged="true" reloadable="true" />
     <Context path="" docBase="c:\Inetpub\wwwroot" debug="0" privileged="true" />
<Context path="/sharon" docBase="C:\Tomcat 4.1\webapps\sharon" debug="0" privileged="true" />





<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="localhost_log." suffix=".txt"
     timestamp="true"/>




<Context path="/examples" docBase="examples" debug="0"
reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Ejb name="ejb/EmplRecord" type="Entity"
home="com.wombat.empl.EmployeeRecordHome"
remote="com.wombat.empl.EmployeeRecord"/>



          
<Environment name="maxExemptions" type="java.lang.Integer"
value="15"/>
<Parameter name="context.param.name" value="context.param.value"
override="false"/>
<Resource name="jdbc/EmployeeAppDb" auth="SERVLET"
type="javax.sql.DataSource"/>
<Resource name="jdbc/TestDB"
     auth="Container"
     type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
     <name>factory</name>
     <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
     </parameter>
     
     <parameter>
     <name>maxActive</name>
     <value>100</value>
     </parameter>
     
     <parameter>
     <name>maxIdle</name>
     <value>30</value>
     </parameter>
     
     <parameter>
     <name>maxWait</name>
     <value>10000</value>
     </parameter>

<parameter>
<name>user</name>
<value>javauser</value>
</parameter>
<parameter>
<name>password</name>
<value>javadude</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>

     <parameter>
     <name>url</name>
     <value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
<Resource name="mail/Session" auth="Container"
type="javax.mail.Session"/>
<ResourceParams name="mail/Session">
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
<ResourceLink name="linkToGlobalResource"
global="simpleValue"
type="java.lang.Integer"/>
</Context>
</Host>
</Engine>
</Service>



</Server>
Pleas4 help!!!

you have your driver jar in Tomcat\common\lib?
if so, check your classpath, it could be that.

Weblogic 7.0 , MySQL 3.23 JDBC Connection Pools

i am using weblogic 7.0 and MySQL 3.23 and right now my objective is to create,
configure and test a JDBC
connection pool using the Administrative console.
Here is what i have done till now
- set the classpath of the MySQL driver in the startWLS.cmd like this
SET MYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java-2.0.14-bin.jar
set CLASSPATH=%MYSQL_DRIVER%;%CLASSPATH%
- using the weblogic administrative console i have created a new connection pool
named as
testpool.
- Here is what i have in the testpool general tab
Name: testpool
URL: jdbc:mysql//localhost:3306/test (test is the name of the database in mysql)
Driver Classname: org.gjt.mm.mysql.Driver
I have not entered any Properties, ACL Name, Password or Open String Password.
- Now i go the the Testing tab and enter a name of a table in my test database
and click on Apply
and on the command window i am getting the following exception
java.sql.SQLException No suitable driver
Thanks in advance,
Ashish

Thanks a lot Slava. After reading your mail and the post i was able to get it working.
"Slava Imeshev" <[email protected]> wrote:
Hi Ashish,
I figured out what's the problem. URL in the connection pool
definition is malformed. It's
jdbc:mysql//localhost:3306/test
while the correct one should have colon after mysql:
jdbc:mysql://localhost:3306/test
Regards,
Slava Imeshev
"Ashish Sureka" <[email protected]> wrote in message
news:[email protected]...
I am sorry, the program that i posted here is not comming properlyformatted but
i am able to run a simple java program that connects to MySQL and alsoa
servlet
that connects to the MySQL. The only problem i am having is includingthe
MySQL
driver jar files to the weblogic server classpath.
Thanks,
Ashish.
"Ashish Sureka" <[email protected]> wrote:
Hello Joseph Weinstein,
Actually, i already tried the same approach that you have mentioned
in
your reply
before i posted my message here. Following is the program that i use
to check
MySQL connection.
import java.sql.*;
public class MySQLConnect
public static void main(String[] args) throws Exception
try {
Class.forName ( "org.gjt.mm.mysql.Driver" );
System.out.println ( "MySQL Driver Found" );
} catch ( java.lang.ClassNotFoundException e ) {
System.out.println("MySQL JDBC Driver not found ... ");
throw ( e );
String url = "";
Connection con = null;
try {
url = "jdbc:mysql://" + "localhost:3306" + "/" + "test";
con = DriverManager.getConnection(url);
System.out.println("Connection established to " + url + "");
} catch ( java.sql.SQLException e ) {
System.out.println("Connection couldn't be established to " + url);
String sqlStatement = "SELECT * FROM testtable";
try {
Statement s = con.createStatement();
s.execute (sqlStatement);
s.close ( );
} catch ( SQLException e ) {
System.out.println ( "Error executing sql statement" );
con.close();
The classpath that i use to run this program is
SET PATH=C:\bea\jdk131_03\bin
SETCLASSPATH=C:\bea\jdk131_03\jre\lib\rt.jar;C:\bea\weblogic700\ebcc\lib\ext\se
rvlet.jar;C:\CSC413\Demos\HelloApp\HelloAppJAR
SET CLASSPATH=%CLASSPATH%;C:\bea\weblogic700\server\lib\weblogic.jar
SETMYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java
-2.0.14-bin.jar
set CLASSPATH=.;%MYSQL_DRIVER%;%CLASSPATH%
I have also written a Servlet which checks the MySQL connection. For
the servlet
i added the MySQL driver jar files in the WEB-INF/lib directory ofthe
servlet
web application and it is working fine.
do you want me to attach the startWLS.cmd file that i changed to include
the MySQL
driver classpath.
Thanks for your replies,
Ashish.
Joseph Weinstein <[email protected]> wrote:
Ashish Sureka wrote:
When i start the weblogic server using the command prompt by executingthe startWLS.cmd,
i can see the classpath the server is using on the command window
and
that includes
the jar file for the MySQL driver but still it is throwing a
SQLException
and
saying that No Suitable driver.
How do i include a external library or jar file on the weblogic
server's
classpath.
is there a specific directory where i should put the MySQL driver
jar
file .
Thanks,
Ashish.No. Let's simplfy the problem. Please run a tiny standalone Java
program
that
just makes a JDBC connection to your MySQL DBMS, with no weblogic
code in the picture. When you succeed at this, show me the CLASSPATH
and
PATH of the shell that ran the program successfully, and show methe
few lines
of code that made the connection. Then we will know the problem.It
may
be that
the URL you're passing to the pool is not exactly correct for that
driver.
Joe
Joseph Weinstein <[email protected]> wrote:
Ashish Sureka wrote:
i am using weblogic 7.0 and MySQL 3.23 and right now my objective
is
to create,
configure and test a JDBC
connection pool using the Administrative console.
Here is what i have done till now
- set the classpath of the MySQL driver in the startWLS.cmd
like
this
SET
MYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java
-2.0.14-bin.jar
set CLASSPATH=%MYSQL_DRIVER%;%CLASSPATH%
- using the weblogic administrative console i have created anew
connection
pool
named as
testpool.
- Here is what i have in the testpool general tab
Name: testpool
URL: jdbc:mysql//localhost:3306/test (test is the name of
the
database
in mysql)
Driver Classname: org.gjt.mm.mysql.Driver
I have not entered any Properties, ACL Name, Password or
Open
String
Password.
- Now i go the the Testing tab and enter a name of a table in
my
test
database
and click on Apply
and on the command window i am getting the following exception
java.sql.SQLException No suitable driverWatch the first lines that the server prints out when the script
starts
it. The script
shows the classpath that was constructed for the server. It is
likely
that you need
to do something else to ensure your driver is really in the classpath
the server uses.
Joe
Thanks in advance,
Ashish

Problem creating connection pool to mysql database

Please, do not ignore this message and help me, if you have any Idea
I have Sun Java System Application Server 8.1 installed on my computer, I installed also MySQL Connector/J to access MySql Databases through JDBC
But now when I try to create new connection pool, an error comes:
Following parameter were used:
Name: MYSQL1
Resource Type: javax.sql.XADataSource
Database Vendor: mysql
Datasource Classname: com.mysql.jdbc.Driver
serverName 192.168.0.152
port 3306
networkProtocol
user testuser
password ***
databaseName test
datasourceName
After saving and then klicking on Ping button, following error comes: "An error has occurred.
Operation 'pingConnectionPool' failed in 'resources' Config Mbean. Target exception message: com.mysql.jdbc.Driver"
I checked the logs of MySql, there was no attempt to access given Database or MYSQL-server at all
What Am I doing wrong? How can I create MySql connection under Sun Java System Application Server 8.1?
Any help will be appreciated

The driver is in right place
Originally I placed him in wrong directory and got an error, indicationg, that Driver class is not found, but then I corrected it, The problem is in connection to database - it doesn't work.
I tired to load the same driver into Netbeans and could easyli create a connection to database, but I get it not working ander Sun Application server

Connection Pool with MySQL

Can anyone tell me all necessary steps required to create a connection pool to
MySQL and use the datasource to get the connection in BMP beans
Thanks in advance
Thara

Using weblogic's mssql driver:
define following configuration in your config.xml.
<JDBCConnectionPool
Name="MSSQLPool"
Targets="myserver"
URL="jdbc:weblogic:mssqlserver4"
DriverName="weblogic.jdbc.mssqlserver4.Driver"
InitialCapacity="0"
MaxCapacity="20"
CapacityIncrement="1"
Properties="user=jmsqa;password=jmsqa123;server=lcdbnt4"
/>
<JDBCDataSource
Name="jdbc.pool.testpool"
Targets="myserver"
JNDIName="jdbc.pool.testpool"
PoolName="testpool"
/>
Also, do following to make sure your environment is set.
java utils.dbping MSSQLSERVER4 USER PASS DBNAME@HOST:PORT
Thara wrote:
Can anyone tell me all necessary steps required to create a connection pool to
MySQL and use the datasource to get the connection in BMP beans
Thanks in advance
Thara

Connection pool issues with Mysql

Hi,
I have defined sufficient read connections (50) in the toplink configuration, I am finding toplink is not releasing the connections in Mysql, this is when run from Jboss App server.
Is anyone aware of toplink connection pool issues with MySql?
thanks

TopLink always closes connections, I cannot see how this could occur.
Please include your persistence.xml or sessions.xml. Also ensure you are closing your EntityManager or ClientSession, especially if using exclusive connections.
Also include the exception you are getting.
James : http://www.eclipselink.org

Help Please: How to make a connection pool with mySQL

Hi,
I am learning the example codes shipped with weblogic server, which is under ...samples\examples\ejb20\basic\beanManaged. The original connection pool was on cloudscape. I was trying to modify it and make it connect to mySQL.
In ejb-jar.xml and weblogic-ejb-jar.xml, I replaced "demopool" (which was the original pool name) with "demopool1".
After starting the server, I tried to configure a new connection pool as following:
Name: demopool1
URL: jdbc:mysql:///test
Driver Classname: org.gjt.mm.mysql.Driver
Properties
(key=value): user=none
server=none
But I got the following errors:
<2007-10-5 ??06?30?09?> <Error> <JDBC> <Cannot startup connection pool "demopool1" Cannot load driver class: org.gjt.mm.mysql.Driver>
What should I do to let the server find the Driver?
Thanks a lot.

Hong Qu wrote:
Thank you Joe,
I added the jar file location to the startExampleServer script. But when I tried to configure the Tx Data Sources from the console, I got the following error:
<2007-10-5 ??08?35?17?> <Notice> <WebLogicServer> <Started WebLogic Admin Server "examplesServer" for domain "examples" running in Development Mode>
setEntityContext called
ejbFindByPrimaryKey (ID: 0)
Failed to lookup JDBC Datasource. Please double check that
the JNDI name defined in the resource-description of the
EJB's weblogic-ejb-jar.xml file is the same as the JNDI name
for the Datasource defined in your config.xml.
<2007-10-5 ??08?38?16?> <Error> <JDBC> <Error during Data Source creation:
weblogic.common.ResourceException: DataSource(examples-dataSource-demoPool1)
can't be created with non-existent Pool (connection or multi) (demoPool1)>>
Do you know where is wrong?
Another problem is the connection method in AccountBean.java:
private Connection getConnection()
throws SQLException
InitialContext initCtx = null;
try {
initCtx = new InitialContext();
DataSource ds = (javax.sql.DataSource)
initCtx.lookup("java:comp/env/jdbc/demoPool");First verify from the console that a pool 'demoPool1' exists and
that you can test it from the console. Then find the DataSource
you associated with that pool. For an EJB I would suggest a
TxDataSource. You defined some JNDI name for the DataSource. Use
that name in the lookup. For instance, if your DataSource's
JNDI name is 'MyDataSource', the code should do this:
DataSource ds = (javax.sql.DataSource)
initCtx.lookup("MyDataSource");
return ds.getConnection();
} catch(NamingException ne) {
log("Failed to lookup JDBC Datasource. Please double check that");
log("the JNDI name defined in the resource-description of the ");
log("EJB's weblogic-ejb-jar.xml file is the same as the JNDI name ");
log("for the Datasource defined in your config.xml.");
throw new EJBException(ne);
} finally {
try {
if(initCtx != null) initCtx.close();
} catch(NamingException ne) {
log("Error closing context: " + ne);
throw new EJBException(ne);
I couldn't figure out what "java:comp/env/jdbc/demoPool" was related, so I just replaced "demopool" with "demopool1". Do you konw what "comp/env/jdbc" mean? Is it a location?
Thank you so much.
Iris

MySQL connection pooling guidelines

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