JDBC Type 2 Driver Programmer's Reference for SQL/MX Release 3.2.1 (H06.26+, J06.15+)

Only one InputStream or Reader and one OutputStream or Writer can be associated with
the current LOB object.
• When the application obtains the InputStream or Reader from the LOB object, the
JDBC/MX driver closes the InputStream or Reader that is already associated with the LOB
object.
• Similarly, when the application obtains the OutputStream or Writer from the LOB object,
the JDBC/MX driver closes the OutputStream or Writer that is already associated with
the LOB object.
Access Considerations for Clob and Blob Objects 53