referring Tomcat JNDI datasource in persistence.xml

Question

in server.xml I\'ve defined global resource (I\'m using Tomcat 6):

Answer 1

(Im using Apache OpenJPA library in Tomcat7 so may not match to Hibernate stuff)

I have never used a global jdbc for my OpenJPA webapps but gave it a try. It worked and this is my configuration. See folder where persistence.xml is saved, probably is openjpa problem but without it nothing works.

myapp/WEB-INF/classes/META-INF/persistence.xml
this is using openjpa provider so class list may not be needed in hibernate.

 



    org.apache.openjpa.persistence.PersistenceProviderImpl
    java:comp/env/jdbc/mydb

    com.myapp.db.User
    com.myapp.db.Server

    
        
         
        
        
    

tomcat/conf/server.xml
Add global jdbc resource.

  ..cut...
  
    

    
  
  ..cut...

tomcat/conf/Catalina/localhost/myapp.xml
this my development box so I use docBase to link directly to projects folder. You should be find inserting this to war package (META-INF/context.xml) when deployed to production box.

myapp/WEB-INF/web.xml
Add resource-ref to the end of file.

  Webapp
  Webapp
  ..cut...

  
    mydb
    jdbc/mydb
    javax.sql.DataSource
    Container
  

Because Im using OpenJPA+Tomcat7 (not fullsized j2ee container) this may look overengineering but thats how it works. Results are good and developing db-aware webapps is very easy. No need to manual sql query hardcoding and oldskool DAO classes.