Can you post the stack trace or post what line of source code it's failing on. It's not clear from you r message whether the NameNotFoundException is coming from the same java:comp/env lookup as before or from the jdbc lookup. You need to double-check that whatever string you are using
for a global lookup actually corresponds to a the global JNDI name of a jdbc resource. I don't see anything with the name "jdbc/mydb" in your sun-resources.xml.
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