Arduino Serial Port Error

When I was trying to upload code to my Arduino UNO for a class, my laptop started throwing a permissions error–which I could fix by adding sudo in front of the arduino command, but when you add sudo to it, it messes up all your files and sketch permissions.

I also tried adjusting the serial port permissions and adding my user to the dialout group, but that still threw the same error.

So I needed to solve this. When I ran the arduino software, I realized that as soon as the program started, it threw this error: java.lang.NullPointerException thrown while loading

Doing a little research, I found this post.

I didn’t have all the java packages and drivers, so I had to install them.

sudo apt install openjdk-11-jdk
sudo apt install openjdk-8-jdk

sudo add-apt-repository ppa:webupd8team/java
sudo apt update
sudo apt install oracle-java8-set-default

After installing all that and restarting the Arduino software, we were good to go!

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