https://gist.github.com/ProsperCraft/06acb45b7b29fd0c51f261e283c51389

Is this fixable? it may just be journeymap serverside, I have gotten in the habit of disabling it serverside as it seems to complain in console a lot.

Caused by: java.lang.RuntimeException: java.io.NotSerializableException: java.util.WeakHashMap
at com.google.common.base.Throwables.propagate(Throwables.java:240) ~[minecraft_server.1.12.2.jar:?]
at p455w0rd.danknull.network.PacketConfigSync.toBytes(PacketConfigSync.java:66) ~[PacketConfigSync.class:?]

Nope, it's on my side. It's due to using classes which don't implement java.io.Serializable - this shouldn't hurt anything, but I am switching to fully serializable classes (ie using Boolean.class over Java's native boolean). I'm also implementing a Serializable version of NonNullList to properly conform with the standard. Thank you for the report!

I have a build up in my discord which should fix this (it did in my local tests in SMP)..would you care to drop by and give it a test? https://discord.gg/8g62YV7
dupe ref: #139

curse approved FAST: https://minecraft.curseforge.com/projects/dank-null/files/2624277

Thank you, just in the nick of time, it made my TownCraft modpack update.

so, fixed?

Will let you know as soon as I can test it, ran in to a snag with the pack with forges recommended new recommended build potion changes and it crashing Immersive Engineering.