Why can't I loadDataFromByteArray()??

hi !
I want to use the mathod "loadDataFromByteArray()" to
a new OrdImage ,but failed. Why?
The code is as fellows:
OrdImage image, imgTmp;
note: object image have already gotten data from a bmp file sucessfully;
(1) byte[] data = image.getDataInByteArray();
this step is ok;
(2) boolean success = imgTmp.loadDataFromByteArray(data);
this step failed.
Please help me!
Thank in advance.
Bill

before running imgTmp.loadDataFromByteArray(data),run imgTmp.deleteContent().
have errors :
ORA-22920: unlock the value including LOB
ORA-06512: at"SYS.DBMS_LOB", line 686
ORA-06512: at"ORDSYS.ORDSOURCE", line 714
ORA-06512: at"ORDSYS.ORDIMAGE", line 173
ORA-06512: at line 2
What can I do?
By the way ,explain as fellows:
1)Ordimage 'image' is a variable of JavaBean with orace database connection and sql satemates;
so the 'image' object is a LOB in db;
2)My true purpose is that :
firstly ,get OrdImage data form database by the javabean with connection and sql statemate,and put it OrdImage 'image' of the javabean.
secondly,use OrdImage.getDataInByteArray() to a variable 'byteArr'.then process the image data and save in 'byteArr'.
thirdly, use the loadDataFromByteArray(byteArr) to OrdImage variable 'ImgTmp',but failed;I think one reason is in ImgTmp's initial(I don't know how to initiate 'ImgTmp') ,and the other reason is the unlock the row including LOB correlate the Javabean above(I don't know how to lock the row);
finnally ,I want not to change the LOB in database .
What should I do??
I welcome anyone's andvice!
Thanks !
bill

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