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Hello, here is an updated guide for using Processing 3 in Eclipse.
A couple more things to add in regards to using Processing once you get it set up:
Accounting for colors by getting used to using ints and bit-masking, using individual rgb variables, or using java.awt.Color.
Passing the PApplet to any separate Java files outside of the client class.
importing other Processing libraries.
Please let me know if you see any errors, or suggestions for things to add.