<p:dataGrid var="car" value="#{postController.cars}" columns="3" rows="12"   <!-- Получаем список cars  -->
                        paginator="true" rowsPerPageTemplate="9,12,15" 
                        currentPageReportTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} 
                        {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}">
                <p:column>
                    <p:panel header="#{car.autoMark}">
                        <h:panelGrid columns="1">
                            <h:outputText value="#{car.autoModel}" />
                            <p:galleria value="#{imageController.getImagesById(car.id)}" var="image" panelWidth="152" panelHeight="102" showCaption="false">   <!-- Получаем список изображений для конкретной car  -->
                                <p:graphicImage value="/TestImage?imageInBytes=#{image.imageInBytes}" alt="Image Description for #{image.id}" title="#{image.lot_id}" /> <!-- Преобразуем байты в изображения сервлетом  -->
                            </p:galleria>
                        </h:panelGrid>
                    </p:panel>
                </p:column>
</p:dataGrid>

<p:graphicImage value="/TestImage?imageInBytes=#{image.imageInBytes}" alt="Image Description for #{image.id}" title="#{image.lot_id}" />

<img id="j_idt19:1:j_idt27" src="/PROJECT/TestImage?imageInBytes=[B@2f0aadeb&;amp;pfdrid_c=true" alt="Image Description for 1" title="1">

        response.setContentType("image/jpeg");
        try (OutputStream out = response.getOutputStream();) {
            byte[] imageInBytes = request.getParameter("imageInBytes").getBytes();
            response.setContentLength(imageInBytes.length);
            out.write(imageInBytes);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

response.setContentType("image/jpeg");
try (OutputStream out = response.getOutputStream();) {
     byte[] imageInBytes = request.getParameter("imageInBytes").getBytes();
     response.setContentLength(imageInBytes.length);
     out.write(imageInBytes);
} catch (Exception ex) {
      ex.printStackTrace();
}

public class ImageController implements Serializable {

    ArrayList<Image> images;

    public ImageController() {
    }
    public ArrayList<Image> getImages(int id) {

        images = new ArrayList<>();
        String sql = "SELECT * FROM image WHERE lot_id='" + id + "'";

        try (Connection conn = Database.getConnection();
                Statement stmt = conn.createStatement();
                ResultSet rs = stmt.executeQuery(sql)) {
            while (rs.next()) {
                Image image = new Image();
                image.setId(rs.getInt("id"));
                image.setUser_id(rs.getInt("user_id"));
                image.setLot_id(rs.getInt("lot_id"));
                image.setImageInBytes(rs.getBytes("image"));

                images.add(image);
            }
        } catch (SQLException ex) {
            System.out.println(ex);
        }
        return images;
    }

                            <p:galleria value="#{imageController.getImages(car.id)}" var="image" panelWidth="152" panelHeight="102" showCaption="false">
                                <p:graphicImage value="" alt="Image Description for #{image.id}" title="#{image.lot_id}"/>
                            </p:galleria>