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PORuntimeException occured : java.lang.RuntimeException: java.lang.ClassCastException: java.lang.String cannot be cast to com.mongodb.DBRef
 

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    <p>I have been using play for a few months now on ubuntu servers and also on Google App Engine using the Siena module. Now I have an application on an Ubuntu server with the following versions:</p> <p>Play Framework - 1.1 Morphia - morphia-1.2beta3</p> <p>My code is throwing a very strange error:</p> <p>RuntimeException occured : java.lang.RuntimeException: java.lang.ClassCastException: java.lang.String cannot be cast to com.mongodb.DBRef</p> <p>for this line inside app/models/Playlist.java:</p> <p>List items = PlaylistItem.filter("playlist", this).asList();</p> <p>"playlist" is a field in PlaylistItem and it's defined as:</p> <p>@Required @Reference public Playlist playlist;</p> <p>The weird thing is that this same application (I have the code in source control and pull to both machines) works on my laptop but does not work on my Ubuntu server. Does anyone know why this may be happening?</p>
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