Server crashes when first player joins

[twiceineverymoment]

Setting up a PYX server for my group, using the command mvn clean package war:exploded jetty:run -Dmaven.buildNumber.doCheck=false -Dmaven.buildNumber.doUpdate=false the application builds and starts successfully, but crashes as soon as the first player clicks "Set" on the nickname screen.

This seems to happen some of the time when that player is connecting over the internet, but every time if that player is connecting to the server via its LAN address from another device on the same network or via localhost.

I've installed it on both a Raspberry Pi 3 B+ and a desktop running Ubuntu 20.04, and both experience the same problem.

Attaching a log file that appears in the Maven directory following a crash. hs_err_pid18521.log

[Noorquacker]

Obvious question, but are you on Java 7 and Tomcat 7 both?

[twiceineverymoment]

There is no Tomcat install, the server is being run according to the quick start guide using this command from a terminal: mvn clean package war:exploded jetty:run -Dmaven.buildNumber.doCheck=false -Dmaven.buildNumber.doUpdate=false The Ubuntu server is using OpenJDK 11.

[Noorquacker]

Yeah, Java versions above 7 just straight up crash, it happened to me back when I tried using Tomcat 8. This project is unmaintained so it's doubtful that you'll get any more support for this. When I set this up so many years ago, I had to go out of my way to install Tomcat 7, which was a real pain. If you want dark theme for everyone and MySQL support instead of PostgreSQL, I did make a fork a long time ago

[twiceineverymoment]

Doesn't compile with Java 7 (code contains lambda expressions which are Java 8 minimum), but I downloaded OpenJDK 8 and ran with Jetty on another server and it seems to work ok. The first server had Java 11 which seemed to cause the crash.