I meant you should use a simple JNDI name without '/'.
<jndi-name>MyJDBCTest</jndi-name>
You should remove the 'use-java-context' element, I do not need it.
this lookup should work:
initialContext.lookup("java:MyJDBCTest");
If you have problems please attach the error log message.
Also I would recommend to use a newer ojdbc implementation, the ojdbc6.jar require a Java6 runtime environment.