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From kashyup <va...@quantum4d.com>
Subject Re: Hibernate + Derby - Unable to determine stream header for hibernate type 'text'
Date Tue, 23 Jun 2009 21:58:51 GMT

took for a test-drive and runs great!

Thanks Krisitian, Rick for the fast response and fix!

kashyup



Rick Hillegas-2 wrote:
> 
> Hi Kashyup,
> 
> At the risk of being pedantic, I just wanted to point out that Kristian 
> has posted a candidate fix but he hasn't checked it in yet. It would be 
> great if you could take the fix for a test-drive and let us know if it 
> solves your problem. You will need to do the following:
> 
> 1) Check out the trunk using subversion.
> 
> 2) Apply Kristian's fix using the "patch" utility.
> 
> 3) Build the code.
> 
> If you need help figuring out how to do this, let us know.
> 
> Thanks,
> -Rick
> 
> kashyup wrote:
>> Hi Kristian,
>> Looking at the jira:  https://issues.apache.org/jira/browse/DERBY-4278
>> https://issues.apache.org/jira/browse/DERBY-4278 
>> seems like you have fixed the issue.
>>
>> Previously I downloaded Derby 10.5.1.1
>>
>> What would be the best way to get this fix? Should I do a check out from
>> the
>> Development Trunk?
>>
>> thanks
>>
>> Kashyup
>>
>>
>>
>>
>> Kristian Waagan-4 wrote:
>>   
>>> kashyup wrote:
>>>     
>>>> Hello all,
>>>> We have just started to look into Derby as our embedded DB for a
>>>> desktop
>>>> app
>>>> version.
>>>>
>>>> Env: Hibernate 3.2 and Derby 10.5.1
>>>>
>>>> I have defined a java string field of type 'text' in Hibernate Mapping
>>>> (works great on Postgres 8.1 and Oracle 10g)
>>>>
>>>> I use Hibernate SessionFactory to generate Table schema, which is done
>>>> without any error.
>>>>
>>>> But, when I try to save records in tables via Hibernate Session, I get
>>>> the
>>>> following exception:
>>>> Note: If I change hibernate mapping to type 'string', then I dont get
>>>> this
>>>> error:
>>>>
>>>> java.lang.IllegalStateException: No context, unable to determine which
>>>> stream header format to generate
>>>> 	at
>>>> org.apache.derby.iapi.types.ClobStreamHeaderGenerator.determineMode(Unknown
>>>> Source)
>>>> 	at
>>>> org.apache.derby.iapi.types.ClobStreamHeaderGenerator.expectsCharCount(Unknown
>>>> Source)
>>>> 	at org.apache.derby.iapi.types.ReaderToUTF8Stream.fillBuffer(Unknown
>>>> Source)
>>>> 	at org.apache.derby.iapi.types.ReaderToUTF8Stream.read(Unknown Source)
>>>> 	at java.io.DataInputStream.read(Unknown Source)
>>>> 	at org.apache.derby.iapi.types.SQLClob.readExternal(Unknown Source)
>>>> 	at org.apache.derby.iapi.types.SQLChar.getString(Unknown Source)
>>>> 	at org.apache.derby.iapi.types.SQLClob.getClone(Unknown Source)
>>>> 	at org.apache.derby.impl.sql.GenericParameter.getClone(Unknown Source)
>>>> 	at org.apache.derby.impl.sql.GenericParameterValueSet.<init>(Unknown
>>>> Source)
>>>> 	at org.apache.derby.impl.sql.GenericParameterValueSet.getClone(Unknown
>>>> Source)
>>>> 	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.addBatch(Unknown
>>>> Source)
>>>> 	at
>>>> org.hibernate.jdbc.BatchingBatcher.addToBatch(BatchingBatcher.java:31)
>>>> 	at
>>>> org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2252)
>>>> 	at
>>>> org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2665)
>>>>
>>>> Also, I need to save it as type 'text' even though it gets saved as
>>>> CLOB(255), as the CLOB column size can later be altered.
>>>>
>>>> What could be the cause? or changes needed?
>>>>   
>>>>       
>>> Hello,
>>>
>>> You have discovered / triggered a bug in the new Clob handling code 
>>> introduced in 10.5.1.
>>> I logged DERBY-4278 [1], and have started working on a fix (the 
>>> regression tests are running, patch needs review).
>>>
>>> Regarding workarounds, I'm afraid all I can think of is using the client 
>>> driver instead of the embedded driver, avoid batching for inserts with 
>>> Clobs, change the data type, or downgrade to 10.4. Another option is to 
>>> build Derby with the patch and test it out :)
>>> I observe that you are using very small Clobs (255 characters). Clobs 
>>> are in general less effective than using for instance VARCHAR.
>>> Is your concern about altering the column size related to Derby, 
>>> Hibernate or something else?
>>>
>>>
>>> Regards,
>>> -- 
>>> Kristian
>>>
>>> [1] https://issues.apache.org/jira/browse/DERBY-4278
>>>     
>>>> thanks all
>>>>
>>>>
>>>>   
>>>>       
>>>
>>>     
>>
>>   
> 
> 
> 

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