GPMONGODB-337: CLONE - Accessing hasMany set with objects will throw the exception: com.mongodb.DBRef cannot be cast to java.io.Serializable

[graemerocher]

Original Reporter: rainbow
Environment: Not Specified
Version: 1.2.0.GA
Migrated From: http://jira.grails.org/browse/GPMONGODB-337

When trying to access hasMany set with objects in a new session, the following error will be thrown:

com.mongodb.DBRef cannot be cast to java.io.Serializable
java.lang.ClassCastException: com.mongodb.DBRef cannot be cast to java.io.Serializable
at org.grails.datastore.mapping.core.AbstractSession.retrieveAll(AbstractSession.java:661)
at org.grails.datastore.mapping.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:206)
at org.grails.datastore.mapping.collection.AbstractPersistentCollection.size(AbstractPersistentCollection.java:88)
at UserObjectsTests$_getAllSavedDataWithANewSession_closure1.doCall(UserObjectsTests.groovy:38)
at org.grails.datastore.gorm.GormStaticApi.withNewSession(GormStaticApi.groovy:731)
at org.grails.datastore.gorm.StaticMethodInvokingClosure.call(GormEnhancer.groovy:288)
at UserObjectsTests.getAllSavedDataWithANewSession(UserObjectsTests.groovy:33)
at UserObjectsTests.testUserObjectsCreation(UserObjectsTests.groovy:29)

After the exception is thrown, the set will be empty even though the mongoDB contains DBRef to the objects.

See attached integration test to reproduce the issue.

[graemerocher]

rainbow said:
I do not think this was be fixed, please see the bug report, only grails run-app, click the book controller and click Create button, see the exception.

[graemerocher]

graemerocher said: