if ( rendDefObj == null ) throw new ValidationException( "RenderingDef with id "+pixelsId+" not found.");
    public void lookupRenderingDef(long pixelsId)    {        rwl.writeLock().lock();                try {            this.rendDefObj = pixMetaSrv.retrieveRndSettings(pixelsId);            this.renderer = null;        } finally {            rwl.writeLock().unlock();        }                if (log.isDebugEnabled())            log.debug("lookupRenderingDef for id "+pixelsId+" succeeded: "+this.rendDefObj);            }