hibernate - Exception when updating Oracle DB row / entity with a Blob column / attribute -

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the exception raises when try update entity bean contains blob column through hibernate merge, , state managed. message text is:

... caused by: java.sql.sqlexception: lob read/write functions called while read/write in progress: getbytes()     @ oracle.jdbc.driver.t4cconnection.getbytes(t4cconnection.java:2963)     @ oracle.sql.blob.getbytes(blob.java:392)     @ oracle.jdbc.driver.oracleblobinputstream.needbytes(oracleblobinputstream.java:166)     ... 120 common frames omitted

any idea why i'm obtaining error? in advance.


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