View difference between Paste ID: Ja9UP8Vn and q5scks60

 import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
 public class CustomImageWriter {
 
     private ExecutorService executorService;
 
     public CustomImageWriter() {
         this.executorService = Executors.newFixedThreadPool(1);
     }
 
     public void writeImage(final BufferedImage image, final File file) throws IOException {
         //Slow
         ImageIO.write(image, "PNG", file);
 
         //My suggestion
         Runnable r = new Runnable() {
             @Override
             public void run() {
                 try {
                     BufferedOutputStream imageOutputStream = new BufferedOutputStream(new FileOutputStream(file));
                     ImageIO.write(image, "PNG", imageOutputStream);
                     imageOutputStream.close();
-                } catch (Exception e) {
+                } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         };
         executorService.submit(r);
     }
 
     public void waitForImages() {
         executorService.shutdown();
 
         try {
             executorService.awaitTermination(1, TimeUnit.DAYS);
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
     }
 
 }