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I am encountering some issue while trying to set font for drawing string function in Java. My goal is to draw something on image using function drawString(text, posLeft, posTop); where text is the string, and posLeft and posTop are positions of it from left and top of the screen. In that purpose i have following code: 

        Icon icon = new ImageIcon(image);       
            
        image.getGraphics().setFont(new Font("Arial", Font.BOLD, size));
        image.getGraphics().setColor(c);
        image.getGraphics().drawString(text, posLeft, posTop);
        
        image.getGraphics().dispose();

where image is instance of java.awt.BufferedImage class object, icon is instance of javax.swing.Icon with constructor of class javax.swing.ImageIcon.ImageIcon(Image image). Font is of the class java.awt.Font. Then i'm getting graphics with image.getGraphics(), however null pointer exception occurs while trying to set font part, in line image.getGraphics().setFont(new Font("Arial", Font.BOLD, size)); .
The error message is only java.lang.NullPointerException: null. I tried changing font but it is still the same.
Would very appreciate any help regarding this! (hope i didn't miss some important part) Both image and image.getGraphics() are working, since i checked it in the code and got following:

BufferedImage@3c52b5ae: type = 5 ColorModel: #pixelBits = 24 numComponents = 3 color space = java.awt.color.ICC_ColorSpace@35069130 transparency = 1 has alpha = false isAlphaPre = false ByteInterleavedRaster: width = 659 height = 587 #numDataElements 3 dataOff[0] = 2
----
sun.java2d.SunGraphics2D[font=java.awt.Font[family=Dialog,name=Dialog,style=plain,size=12],color=java.awt.Color[r=255,g=255,b=255]]
----

where first part above--- is image, and later is image.getGraphics(). Also, I tried using Font f=new Font('Arial',Font.BOLD,size), and there i firstly got null pointer exception and some null value occurring there.

slomil
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  • Looks like `image.getGraphics()` is `null`. Have you checked it ? – Sudhir Ojha Feb 03 '21 at 12:01
  • Could someone perhaps reopen the question, i changed tag, and added additional details. – slomil Feb 03 '21 at 14:56
  • It's still incomplete. You need a minimal reproducible example. Are you saying `Font f=new Font("Arial",Font.BOLD,size)` is enough to cause an NPE? – matt Feb 03 '21 at 14:59
  • For example, http://pastie.org/p/5yFYLP66FRs2jK7MdMIinw this is a minimal example with all of the relevant bits from your post. It works fine for me. – matt Feb 03 '21 at 15:08
  • Also, is `size` an Integer? If it is an Integer, then it can be null and you'll get an NPE when auto-unboxing occurs. – matt Feb 03 '21 at 15:13
  • @matt It seems that to me. System.out.println("----"); System.out.println(image); System.out.println("----"); Font font = new Font("Arial", Font.BOLD, size); System.out.println(font); System.out.println("----"); Here everything is printed and line Font font= new Font("Arial",Font.BOLD,size) throws the null pointer exception. Size is int primitive type. – slomil Feb 03 '21 at 15:17
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    @slomil try printing out `size` – matt Feb 03 '21 at 15:18
  • Thank you man.. i had many different methods where i called this function, and in one place i had null value.. – slomil Feb 03 '21 at 15:48

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