Hi,
does someone have any experience using Castor with Tomcat 4.0? In
particular, I'm having problems using the JNDI lookup mechanism to get a
reference to the JDO object. This is a portion of the source file I'm
using:
try
{
InitialContext ctx = new InitialContext();
DataObjects jdo = (DataObjects) ctx.lookup ("java:comp/env/jdo/mydb");
Database db = jdo.getDatabase();
/* do stuff with database */
}
catch (Exception e)
{
e.printStackTrace();
}
This is the web.xml containing references to my database and the JDO:
<web-app>
<resource-ref>
<description>Resource reference to DataSource</description>
<res-ref-name>jdbc/mydb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<resource-ref>
<description>Resource reference to JDO</description>
<res-ref-name>jdo/mydb</res-ref-name>
<res-type>org.exolab.castor.jdo.JDO</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
This is the corresponding Resource-tag in Tomcat's server.xml file:
<Resource name="jdo/mydb" auth="Container"
type="org.exolab.castor.jdo.JDO"/>
I'm using the following database.xml:
<database name="tst" engine="sapdb" >
<jndi name="java:comp/env/jdbc/mydb"/>
<mapping href="webapps/dysk/WEB-INF/mapping.xml" />
</database>
When I execute the program, Tomcat gives me the following error (only
first couple of lines pasted):
javax.naming.NamingException: Cannot create resource instance
at org.apache.naming.NamingContext.lookup(NamingContext.java:837)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:181)
at org.apache.naming.NamingContext.lookup(NamingContext.java:822)
at org.apache.naming.NamingContext.lookup(NamingContext.java:194)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:183)
at javax.naming.InitialContext.lookup(Unknown Source)
Does anyone know what this error means?
When I create the JDO class as if the servlet were a client-type program
(that is: without the JNDI-lookup), it works correctly, but that's not
what I want to do. Can anyone tell me what I'm doing wrong?
Regards,
Dirk Kemper
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