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


i have been using play few months on ubuntu servers , on google app engine using siena module. have application on ubuntu server following versions:

play framework - 1.1 morphia - morphia-1.2beta3

my code throwing strange error:

runtimeexception occured : java.lang.runtimeexception: java.lang.classcastexception: java.lang.string cannot cast com.mongodb.dbref

for line inside app/models/playlist.java:

list items = playlistitem.filter("playlist", this).aslist();

"playlist" field in playlistitem , it's defined as:

@required @reference public playlist playlist;

the weird thing same application (i have code in source control , pull both machines) works on laptop not work on ubuntu server. know why may happening?

you may want check this bug report. seems issue.


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