Help Please: How to make a connection pool with mySQL

Question

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.

Answer 1

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