How to avoid this NullPointerException

Question

I\'m working on a small arcade video game, and I am looking to double buffer to improve animation. I have one class that\'s supposed to draw the blank image, and another class t

Answer 1

You're calling dbg on the this instance, not the instance of render.

You need to change it to

render.dbg.drawLine(....)

Alternatively, if you wanted to leave the dbg call the same, you could call

this.gameRender();

first and then call

dbg.drawLine(...);