It seems to be impossible in OO3.2 to store a Database document to an XOuputStream via the code 
sequence: 
[code]
XComponent xComponent; // Maybe Writer, Impress, Calc or Database document.
java.io.OutputStream output;
PropertyValue [ ] xPropertyValue = new PropertyValue [ 2 ];
xPropertyValue [ 0 ] = new PropertyValue ( );
xPropertyValue [ 0 ] . Name = "FilterName";
ReportOutputStream document; XStorable xStorable;
xPropertyValue [ 0 ] . Value = "writer8"; // for example
 document = new DocumentOutputStream ( output );
 xPropertyValue [ 1 ] = new PropertyValue ( );
 xPropertyValue [ 1 ] . Name = "OutputStream";
 xPropertyValue [ 1 ] . Value = document;
  try
    { xStorable = ( XStorable ) UnoRuntime . queryInterface
        ( XStorable.class, xComponent );
      xStorable . storeToURL ( "private:stream", xPropertyValue );
   }
catch ( final com.sun.star.io.IOException exception )
  { final String message = exception . getMessage ( );
     throw new DatabaseException ( message );
 }
[/code]

The reported error message is as follows (The text "Could not save document" is transcribed from the 
underlying OO stack)

com.entropy.reporting.database.DatabaseException: Could not save the document:
com.sun.star.ucb.ContentCreationException:
No Content Provider available for given URL!

 THIS IS IMPORTANT BECAUSE THE METHOD PROVIDES A DIRECT TRANSCRIPTION IF A DYNAMICALLY 
GENERATED DOCUMENT TO A SERVLET HTTPServletResponse OutputStream. THE APPROACH WORKS for 
Writer, Calc and Impress. IT SHOULD ALSO WORK FOR DATABASE IN MY VIEW. I THINK, THEREFORE, 
THAT THIS BUG SHOULD HAVE A HIGH PRIORITY!

The Writer, Calc and Impress documents are typically created as follows:
[code]
XDesktop XDesktop;
xComponentLoader = ( XComponentLoader ) UnoRuntime . queryInterface
  ( XComponentLoader.class, xDesktop );
 PropertyValue [ ] xDeskProps = new PropertyValue [ 1 ];
 xDeskProps [ 0 ] = new PropertyValue ( );
 xDeskProps [ 0 ] . Name = "Hidden";
 xDeskProps [ 0 ] . Value = false;

 xComponent = xComponentLoader . loadComponentFromURL
   ( "private:factory/swriter", "_blank", 0, xDeskProps );

 xComponent = xComponentLoader . loadComponentFromURL
   ( "private:factory/simpress", "_blank", 0, xDeskProps );

 xComponent = xComponentLoader . loadComponentFromURL
   ( "private:factory/scalc", "_blank", 0, xDeskProps );
[/code]

 Note that the same empty document instantiation works for Database also. There is however no (not 
even any empty) XDataSource object. NEITHER CAN THIS BE CREATED USING THE APPROACH OUTLINED 
IN THE MANUAL / USER-GUIDE (SEE http://www.openoffice.org/issues/show_bug.cgi?id=111454 ).

 Your effort (and any reasonable work-around) would be much appreciated.