Software Version: Niagara N4 4.6
Error Code: java.lang.NullPointerException in MSTP property sheet fault section
This error appears when setting up BACnet MSTP network. The presence of java.lang.NullPointerException does not necessarily mean a Java error. Solution: Reboot the JACE after adding MS/TP ports to get the port actually polling. The reboot typically resolves the issue and allows the MSTP network to function properly.