I am struggling to figure out why my Tomcat installation is failing to allow
me to connect my java web application to a database. I am looking for ideas
as to how to find out what is wrong. I have (what I think) is the same setup
on another machine and it works fine. The only difference between these is
that the working one in tomcat 5.0 and this machine is tomcat 5.5 (although I
am just about and try with a 5.0 setup).
I am trying with this simple piece of code - plucked from the tomcat docs.
Context initCtx;
try {
initCtx = new InitialContext();
Context envCtx = (Context)
initCtx.lookup("java:comp/env");
DataSource ds = (DataSource)
envCtx.lookup("jdbc/akcmoney");
Connection conn = ds.getConnection();
} catch (Exception e1) {
e1.printStackTrace();
}
and with debug, I can see that initCtX, envCtx and ds all are assigned non
null values, but the ds.getConnection() results in the following.
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC
driver of class '' for connect URL 'null'
I have the postgresql jdbc driver jar in $CATALINA.BASE/common/lib
Server.xml contains
<Context docBase="akcmoney" path="/akcmoney" reloadable="true"
source="org.eclipse.jst.j2ee.server:akcmoney">
<Resource auth="Container" name="jdbc/akcmoney"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/akcmoney">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>org.postgresql.Driver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:postgresql://127.0.0.1:5432/akcmoney</value>
</parameter>
<parameter>
<name>username</name>
<value>tomcat4</value>
</parameter>
<parameter>
<name>password</name>
<value>xxxxxxx</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>10</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>-1</value>
</parameter>
</ResourceParams>
</Context>
my WEB-INF/web.xml contains this reference.
<resource-ref>
<description>AKCMoney Database</description>
<res-ref-name>jdbc/akcmoney</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
Anyone any ideas where I am going wrong, or how to look at the contents of the
nitCtX, envCtx and ds variables in the above code snippet to understand how
far I have got
--
Alan Chandler
http://www.chandlerfamily.org.uk
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