Multi-threading, event driven reads causing read/write errors?

[dwayne-mss]

I am working with a RPI with an attached AdaFruit 16x2 display plate that includes 5 pushbuttons. I have a Java app that sleeps for a second and then wakes to run some code that includes writing to the display. While that is going on, I have a GPIO listener configured for button presses. I have almost constant, repeatable GPIO read and write errors when both the button listener and the display writes are enabled. Turn either off and read/write errors disappear.

The code is based on the MCP23017GpioExample.java example included in pi4j distro.

Both display and buttons are connected to a single MCP27017 expander. Should I expect to be able to do this? Or is this architecturally a bad idea/not supported?