Java classes in database

I am working on an Oracle 10.2.0.3 database housed in a sun solaris OS.
There are 2 tablespaces DEFAULT_DATA and NONDEFAULT_DATA for users to create objects.
User HARPER has a default tablespace of DEFAULT_DATA assigned to him only to which he has a quota(enough for him to create his objects). However, when he uses the Oracle loadjava utility to load classes, he gets an error stating :
Error while loading class org/jdom/Attribute
ORA-01536: space quota exceeded for tablespace 'NONDEFAULT_DATA'
Why would this be attempting to create a new segment extent in a tablespace it is not privileged to use? Any pointers as to where to look would be great.

select username,default_tablespace
from dba_users
where username='HARPER';
Results:
HARPER DEFAULT_DATA
select * from dba_ts_quotas
where username='HARPER';
Results:
TABLESPACE_NAME=DEFAULT_DATA
USERNAME=HARPER
BYTES=266338304
MAX_BYTES= -1
BLOCKS=32512
MAX_BLOCKS= -1
DROPPED=NO

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