javafx将图像更新到mysql数据库

我尝试在从数据库读取图像后更新它并抛出

java.lang.NullPointerException
SQL Error
    at java.io.FileInputStream.<init>(FileInputStream.java:130)
    at tprison.Tprison.lambda$startgu$21(Tprison.java:947)

下面是从数据库检索图像并显示的代码

java.lang.NullPointerException
SQL Error
    at java.io.FileInputStream.<init>(FileInputStream.java:130)
    at tprison.Tprison.lambda$startgu$21(Tprison.java:947)

InputStream is = rsgf.getBinaryStream("Pic");
         OutputStream os = new FileOutputStream( new File("photo.jpg"));



            byte[] content = new byte[1024];
            int size = 0;
            while((size = is.read(content)) != -1){
                os.write(content,0,size);
            }
            os.close();
            is.close();

            imageg = new Image("file:photo.jpg", 130, 140, true, true);
            rectangleg = new Rectangle(130,140);
            rectangleg.setFill(new ImagePattern(imageg));

            rectangleg.setArcWidth(10);
            rectangleg.setArcHeight(10);

            bpgu.setTop(rectangleg);
            BorderPane.setAlignment(rectangleg, Pos.TOP_LEFT);
            bpgu.setMaxSize(130, 140);
            bpgu.setPrefSize(130, 140);
            bpgu.setVisible(true);

最后是将图像更新到数据库的代码，错误点在哪里（fileg为null）

java.lang.NullPointerException
SQL Error
    at java.io.FileInputStream.<init>(FileInputStream.java:130)
    at tprison.Tprison.lambda$startgu$21(Tprison.java:947)

改变这个

java.lang.NullPointerException
SQL Error
    at java.io.FileInputStream.<init>(FileInputStream.java:130)
    at tprison.Tprison.lambda$startgu$21(Tprison.java:947)

imageg = new Image("file:photo.jpg", 130, 140, true, true);

为了完成这项工作

java.lang.NullPointerException
SQL Error
    at java.io.FileInputStream.<init>(FileInputStream.java:130)
    at tprison.Tprison.lambda$startgu$21(Tprison.java:947)

fileg = new File("photo.jpg");
imageg = new Image(fileg.toURI().toString(), 130, 140, true, true);