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Loading Hibernate DAO's in grails view and Lazy Initialization Errors

06:01PM Jun 10, 2009 in category Grails & Groovy by Alexander Pirsig

At the moment I'm on a project with grails and since I'm new to "grails & groovy" I discover problems everyday but most of the time it's not soooo hard to solve them because Grails / Rails / Symfony take the same aproche get thinks done. So in moste cases it's only a matter of minutes to get it right using google

This morning i discovered a real strange problem I had a navigation menue like this. 
    
  
  • nav1
    • 
  
  • nav2
    • 
  
  • nav3
  
      
    
    • sub1
      • 
    
    • sub1
      • 
    
    • sub1
      • 
  
    
  
  •
And because I had to switch my relationship in the database from 1:N to N:M I also needed to do dynamic lookups in grails view it self. I tried something like this: 
    
  
    
  • 
      
      
         
           
    • ${author.title}
      • 
               
      
    
    
    •
But it failed, .... with Hibernate a Exception "... no session or session was closed ..." I had the exact same problem in the past in a normal spring project when you're hibernate session went away and you've tried to access the object that where connected to it ....

So spending quite some time in Google I discovered the solution in one of the Grails tutorials ... The solution was to add a Filter to the web.xml configuration to make database session available to Views AWWWSOME! Thanks buddies! Here is the code to add to you're web.xml

Next, locate the web.xml template, grails-app/src/templates/war/web.xml. Add the following: 


  hibernateFilter
  
      org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewFilter
  


 
  hibernateFilter 
  /*
Insert the above JUST BEFORE the first in the template (it should be the charEncodingFilter).

Kommentare[1] Tags: initialization groovy hibernate web.xml filter errors no-session-or-session-was-closed closed grails loading session dao factory dataaccessobject views was java lazy

Kommentare:

Alexander,

What version of grails were you using? I cannot get this to work with version 1.1.1 or 1.1.2. This would really save my day to see it work.

Gesendet von Ben am Dezember 09, 2009 at 05:54 PM MEZ #

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