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Prem,
Prem Padarath wrote:
> I am trying to set up a database resource in Tomcat 5.5.20 . I am having a
> problem getting a DataSource object back from a JNDI lookup.
> (I am getting a "org.apache.tomcat.dbcp.dbcp.BasicDataSource" object
> returned and throwing an exception - code below)
o.a.t.d.d.BasicDataSource implements javax.sql.DataSource. What's the
problem?
> My context.xml file (placed in my webapp under META-INF) looks as follows:
>
> <Context crossContext="true" path="/dbtest" reloadable="true">
Remove the "path" attribute, please. It is unlikely to be causing
problems, but you should definitely take it out.
> <Resource
> name="jdbc/MYSQLDS"
> auth="Container"
> type="javax.sql.DataSource"
> driverClassName="com.mysql.jdbc.Driver"
> url="jdbc:mysql://localhost:3306/testdb"/>
This looks fine.
> My web.xml file contains the following:
>
> <resource-ref>
> <description>DB Connection</description>
> <res-ref-name>jdbc/MYSQLDS</res-ref-name>
> <res-type>javax.sql.DataSource</res-type>
> <res-auth>Container</res-auth>
> </resource-ref>
I have found that <resource-ref> is superfluous when using a
context-defined DataSource. I'm not sure if that's the way it's supposed
to be, but I have found that this doesn't matter.
> And the snippet/code I am using to acquire a datasource is as follows:
>
> DataSource ds = null;
> ....
> ds = (DataSource)initContext.lookup("java:/comp/env/jdbc/MYSQLDS");
Looks good to me.
> When the app is run, I get back
>
> java.lang.Exception: org.apache.tomcat.dbcp.dbcp.BasicDataSource
> dbtest.HelloWorld.execute(HelloWorld.java:53)
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> sun.reflect.NativeMethodAccessorImpl.invoke(
> NativeMethodAccessorImpl.java:39)
> sun.reflect.DelegatingMethodAccessorImpl.invoke (
> DelegatingMethodAccessorImpl.java:25)
> java.lang.reflect.Method.invoke(Method.java:585)
Can you give us the full stack trace? All I see is reflection code in
there. Is there a message? java.lang.Exception is just a little less
useful than getting a java.lang.Throwable.
- -chris
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