Jasper Report 5.6 image usage

I have Jasper 5.6 and 3 different logos which are used in different cases. My java code is:

_initialParameters.put("LOGO_DOC_REF", getDoc(_session, _workletShell)
                .getLogo());
        return super.completeReportParameters(_session, _workletShell,

        _businessContextProviders, _initialParameters);

So in my LOGO_DOC_REF i have my logo.bmp and till now everything is ok, it saves different logos for different case.

And this is my jasper code relative to image:

    parameter name="LOGO_DOC_REF" class="java.lang.String"
![CDATA[$P{DOCUMENT_SERVICE}.getDocumentContentStreamFromDocRef($P{LOGO_DOC_REF})]

In previous Jasper version it worked... All my logos.bmp are in the DB.