managed to resolve the earlier error
but is getting this exception now, any way to increase the heap space, or is a 
non-related issue?

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at 
org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:123)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:78)
        at 
org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:65)
        at 
org.apache.cassandra.tools.SSTableImport.importUnsorted(SSTableImport.java:211)
        at 
org.apache.cassandra.tools.SSTableImport.importJson(SSTableImport.java:197)
        at org.apache.cassandra.tools.SSTableImport.main(SSTableImport.java:421)

thanks! 
Steven Teo

On 13-Apr-2011, at 1:15 PM, Steven Teo wrote:

> the data is a custom json, seems like i may have got the structure wrong. 
> how should the import json be like?
>  
> Steven Teo
> 
> On 13-Apr-2011, at 10:43 AM, aaron morton wrote:
> 
>> Reading the code looks like it could not find a subColumns item for the row 
>> in the json file. 
>> 
>> The target CF is a super CF, is the data from a super CF ? 
>> 
>> Aaron
>> 
>> On 13 Apr 2011, at 07:24, Steven Teo wrote:
>> 
>>> Hi,
>>> 
>>> I am trying to run json2sstable with the following command but am receiving 
>>> the below error.
>>>     json2sstable -K testks -c testcf output.json 
>>> /var/lib/cassandra/data/testks/testcf-f-1-Data.db 
>>> 
>>> Importing 321 keys...
>>> java.lang.NullPointerException
>>>     at 
>>> org.apache.cassandra.tools.SSTableImport.addColumnsToCF(SSTableImport.java:136)
>>>     at 
>>> org.apache.cassandra.tools.SSTableImport.addToSuperCF(SSTableImport.java:173)
>>>     at 
>>> org.apache.cassandra.tools.SSTableImport.importUnsorted(SSTableImport.java:228)
>>>     at 
>>> org.apache.cassandra.tools.SSTableImport.importJson(SSTableImport.java:197)
>>>     at org.apache.cassandra.tools.SSTableImport.main(SSTableImport.java:421)
>>> ERROR: null
>>> 
>>> anything i did wrongly here?
>>> 
>>> Thanks!
>> 
> 

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