Trouble saving a Java List inside of a map to Morphia. [moved]

[jyemin]

This is Issue 446 moved from a Google Code project.
Added by 2013-01-31T05:43:42.000Z by corybill...@gmail.com.
Please review that bug for more context and additional comments, but update this bug.

Original labels: Type-Defect, Priority-Low

Original description

What version are you using? Morphia, MongoDB, Java

<b>Please include a stack trace below:</b>

I am getting this error from this line of code.  How can I save a List inside of a Map in Morphia.  Is it possible?  Thanks.

@Reference
private Map<Integer,List<VanillaOption>> optionsByDay;


com.google.code.morphia.mapping.MappingException: Error mapping field:code.com.corybill.model.IronCondor.optionsByDay
    at com.google.code.morphia.mapping.Mapper.toDBObject(Mapper.java:444)
    at com.google.code.morphia.mapping.Mapper.toDBObject(Mapper.java:426)
    at com.google.code.morphia.DatastoreImpl.entityToDBObj(DatastoreImpl.java:674)
    at com.google.code.morphia.DatastoreImpl.save(DatastoreImpl.java:722)
    at com.google.code.morphia.DatastoreImpl.save(DatastoreImpl.java:793)
    at com.google.code.morphia.DatastoreImpl.save(DatastoreImpl.java:703)
    at com.google.code.morphia.DatastoreImpl.save(DatastoreImpl.java:697)
    at code.com.corybill.control.dataLoad.IronCondorDataLoad.getData(IronCondorDataLoad.java:123)
    at code.com.corybill.control.dataLoad.IronCondorDataLoad.invoke(IronCondorDataLoad.java:68)
    at code.com.corybill.PrepareIronCondors.run(PrepareIronCondors.java:43)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at com.google.code.morphia.mapping.ReferenceMapper.getKey(ReferenceMapper.java:116)
    at com.google.code.morphia.mapping.ReferenceMapper.writeMap(ReferenceMapper.java:100)
    at com.google.code.morphia.mapping.ReferenceMapper.toDBObject(ReferenceMapper.java:41)
    at com.google.code.morphia.mapping.Mapper.writeMappedField(Mapper.java:529)
    at com.google.code.morphia.mapping.Mapper.toDBObject(Mapper.java:442)
    ... 12 more
Exception in thread &quot;pool-1-thread-1&quot; java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(Unknown Source)
    at java.util.ArrayList.get(Unknown Source)
    at code.com.corybill.helper.CalendarHelper.popAllOfThisWeekFromList(CalendarHelper.java:152)
    at code.com.corybill.control.dataLoad.IronCondorDataLoad.getData(IronCondorDataLoad.java:84)
    at code.com.corybill.control.dataLoad.IronCondorDataLoad.invoke(IronCondorDataLoad.java:68)
    at code.com.corybill.PrepareIronCondors.run(PrepareIronCondors.java:43)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

[evanchooly]

@reference is used, basically, as a poor man's foreign key inside mongodb. Are you sure it's needed there and that you shouldn't just treat it as an embedded document in your model?

[evanchooly]

I think the problem here is likely that those VanillaOptions have not been saved yet.