Brian, thank you for replying. I was afraid my topic was dead. If you
could look at my first post, I listed all the files that you have
suggested I take a look at. I have done everything you have suggested,
but am still getting errors. The error I am getting now is
javax.naming.NameNotFoundException: Name java:comp is not bound in this
Context
I can't find anything on the net or in any books I've looked at that
explains this. As far as I can tell, java:comp should just be there.
Any ideas? Thanks again.
Sean
Brian Cook wrote:
Yes you can use JNDI with out using JSTL. But the only way to
configure it is to define the JNDI resources in the web.xml and
context.xml files. Technically you should be able to use the
globally defined JNDI resources in server.xml, and I have seen
configuration set ups doing it when googling. But could never get
them to work.
This highlights another area of seemingly unneeded complication in
Java/Unix development. Using JNDI for data sources which was supposed
to help you save time requires that you redundantly define the JNDI
resource in at lest 2 if not 3 places.
The admin tool which was also supposed to help save time defines the
JNDI resources in server.xml which does not really seem to be all that
helpful. I am sure there is likely a reason for this but I am
ignorant of it. The admin tool is also supposed to let you define
JNDI resources per context but it errors out when ever I have tried it.
My experience with the Tomcat Admin and Manager tools is that they are
worthless. Of the few steps they try to help with more often that not
they just return errors when you need to use it. I removed them both
and have gone back to doing set ups manually and there has not been
much of a time difference doing it this way.
Any way for JNDI to work you will have to add the definition for it in
both web.xml and context.xml in the <<Tomcat
Folder>>/conf/Catalina/localhost/ folder. This seems counter
productive since it makes your app less portable having the data base
configuration details inside the context and by extent the WAR file
but it is what you have to do to get it to work right now.
I feel your pain I know it is frustrating spending hours debugging
just the DB connection but todate that is the reality of Java web app
development. It is why I fear we will all be .Net developers some day.
Example :
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jndi-resources-howto.html
<CODE>
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource)
envCtx.lookup("jdbc/EmployeeDB");
Connection conn = ds.getConnection();
... use this connection to access the database ...
conn.close();
</CODE>
<WEB.XML>
<resource-ref>
<description>
Resource reference to a factory for java.sql.Connection
instances that may be used for talking to a particular
database that is configured in the server.xml file.
</description>
<res-ref-name>
jdbc/EmployeeDB
</res-ref-name>
<res-type>
javax.sql.DataSource
</res-type>
<res-auth>
Container
</res-auth>
</resource-ref>
</WEB.XML>
<CONTEXT FILE>
<Context>
<Resource name="jdbc/EmployeeDB"
auth="Container"
type="javax.sql.DataSource"
username="dbusername"
password="dbpassword"
driverClassName="org.hsql.jdbcDriver"
url="jdbc:HypersonicSQL:database"
maxActive="8"
maxIdle="4"/>
</Context>
</CONTEXT FILE>
Sean Rowe wrote:
Dirk, I'm sorry I didn't see the difference on the page you sent me
to. However, if there is a way I can do this without having to use
jstl, I would really like to know. I was hoping to put the code in a
class somewhere that my servlets could use.
thanks,
sean
Dirk Weigenand wrote:
Sean,
--- Ursprüngliche Nachricht ---
Von: Sean Rowe <[EMAIL PROTECTED]>
An: Tomcat Users List <tomcat-user@jakarta.apache.org>
Betreff: Re: jndi question
Datum: Mon, 22 Aug 2005 09:24:10 -0500
Thanks for responding Dirk. I've practically memorized the
documentation on the link you sent:
// Obtain our environment naming context
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
// Look up our data source
DataSource ds = (DataSource)
envCtx.lookup("jdbc/EmployeeDB");
// Allocate and use a connection from the pool
Connection conn = ds.getConnection();
... use this connection to access the database ...
conn.close();
Whenever I try this, here's what I get (which led me to trying it
the way
I posted):
javax.naming.NameNotFoundException: Name java:comp is not bound in
this
Context
No. Did you look at
http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jndi-datasource-examples-howto.html?
I recommend putting the context definition in its own content.xml. On
redeploying my application tomcat wouldn't find the driver class
anymore.
Mind you not the class itself but the definition of what class to load.
This problem was solved by putting the context into context.xml.
regards
Dirk
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