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From "Liem Do" <l...@waterware.com>
Subject Re: Intermittent failures using DataSources
Date Wed, 26 Nov 2003 21:48:31 GMT
Chris,

I'm not sure if it makes a difference but try putting the ResourceLinks
before the Realm definition in server.xml.

HTH
Liem

----- Original Message ----- 
From: "Chris Ward" <cward@horizon-asset.co.uk>
To: <tomcat-user@jakarta.apache.org>
Sent: Wednesday, November 26, 2003 12:23 PM
Subject: Intermittent failures using DataSources


>
>
>
> Hi all,
>
> Please excuse any going over of old ground with this question, I have
> searched every archive
> I can find.  I have recently started using DataSources from JSPs using
> the JSTL taglib (I think
> this is a Tomcat rather than taglib question).
>
> I've got a <Context> for my apps and initially had my bunch of
> DataSources set up within
> the <Context>.
>
> No problems.  Happy, happy.
>
> Anyway - a few days ago I set up the required database tables to support
> a DataSourceRealm
> for FORM authentication and I moved all my DataSource config up to the
> <GlobalNamingResources>
> since I'm sure I read somewhere that this had to be done.
>
> That initially caused me problems until I added a <ResourceLink> to my
> <Context> for each DataSource
>
> . . . . . .
>
> <Context path="/hal" docBase="hal" debug="0" privileged="true"
> reloadable="true">
> <Logger className="org.apache.catalina.logger.FileLogger"
> prefix="HAL." suffix=".txt" timestamp="true"/>
>
> <!-- DataSources moved from here to
> GlobalNamingResources area -->
>
> <Realm
> className="org.apache.catalina.realm.DataSourceRealm" debug="99"
> dataSourceName="jdbc/Id" userTable="HAL_UserId"
>
> userNameCol="Name" userCredCol="Password"
> userRoleTable="HAL_UserRole" roleNameCol="Role"
> />
> <ResourceLink name="jdbc/Id" global="jdbc/Id"
> type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/Static" global="jdbc/Static"
> type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/Params" global="jdbc/Params"
> type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/Control" global="jdbc/Control"
> type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/SelmaData"
> global="jdbc/SelmaData" type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/BartData"
> global="jdbc/BartData" type="javax.sql.DataSource"/>
> <ResourceLink name="jdbc/Beauchamp"
> global="jdbc/Beauchamp" type="javax.sql.DataSource"/>
> </Context>
>
> . . . . . .
>
>
>
> All the <DataSources> are set up along these lines..
>
> . . . . . .
>
> <Resource name="jdbc/Id" auth="Container"
> type="javax.sql.DataSource"/>
> <ResourceParams name="jdbc/Id">
> <parameter>
> <name>username</name>
> <value>{deleted in mail}</value>
> </parameter>
> <parameter>
> <name>password</name>
> <value>{deleted in mail}</value>>
> </parameter>
> <parameter>
> <name>driverClassName</name>
> <value>com.inet.tds.TdsDriver</value>
> </parameter>
> <parameter>
> <name>url</name>
> <value>{deleted in mail}</value>
> </parameter>
> </ResourceParams>
>
> . . . . . .
>
>
> So I think everthing looks okay.
>
>
> Problems
> ========
>
> 1) With the above setup I get...
> --------------------------------
>
> ServerLifecycleListener: createMBeans: MBeanException
> java.lang.Exception: ManagedBean is not found with DataSourceRealm
>         at
> org.apache.catalina.mbeans.MBeanUtils.createMBean(MBeanUtils.java:642)
>
> In my Tomcat console, unless I comment out these lines in server.xml
>
> <Listener
> className="org.apache.catalina.mbeans.ServerLifecycleListener"
> debug="0"/>
> <Listener
> className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
> debug="0"/>
>
> If I *do* comment them out the Tomcat Admin tool will complain.
>
>
>
> 2) Sometimes my JSPs just start failing with this message...
> ------------------------------------------------------------
>
> org.apache.jasper.JasperException: Unable to get connection, DataSource
> invalid: "Cannot load JDBC driver class 'null'"
> at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja
> va:254)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
>
> even though they may have been running fine beforehand.
>
>
>
> Any help would be great.  Sorry for the length of the message, it's
> driving me
> crazy!
>
>
> Many thanks,
> Chris
>
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