With the availability of development builds for Minecraft 1.14.3-pre4, I would like to take this opportunity to provide some key information that supplements what has already been said about 1.14.

Minecraft 1.14 Information (Read First!): https://www.spigotmc.org/threads/369724/

In particular, it is often still asked "when will Spigot 1.14 be released?". The simple answer to this question is that it is already available for public access. The more nuanced answer is that it is available as a "development build". The characteristics of a development build include the following:
  • It is not the default version available. You are required to use the --rev argument to BuildTools to retrieve it.
  • It is aimed primarily at developers and experienced server owners.
  • There is a higher than usual chance that running such a version may cause irreparable damage to your map. Even if the damage is not irreparable, it is unlikely that attempts to fix such damage will be made - you must restore from a backup.
  • The usual API stability guarantees do not apply. A previously valid plugin using new API features may be broken from one build to the next.
  • Similarly a previously valid server configuration may not be valid in a later build.
    • eg the current requirement that all world names be lower case
  • Updates are very frequent, usually several versions a day.
The followup question is usually "well when will it not be a development build?". In 1.13.x we tried a graduated colour system of stability, but for various reasons this did not work out. Instead for 1.14.x we suggest that you take a look at the Spigot (and to a lesser extent Mojang) issue trackers to decide when the build is right for you, keeping in mind the above points.

In terms of upgrading the build to "default" status, this is done...
Dear SpigotMC Community,

It is my pleasure to announce that development builds for the Minecraft 1.14.3-pre4 are now available. Hopefully most of you are now familiar with how these releases work, so I will try to be brief with the details, but please still make sure you read this post in its entirety.

This is a Development Build
The software released today is the product of several months work. Although the API changes are small compared to 1.13, this is not a small release. In fact it is almost as large as 1.13. Accordingly the software has no doubt inherited many bugs from Vanilla and a few of its own, meaning it is not ready for use on a production server. If using this software you must keep backups, and you must be prepared to use them. As always, downgrading is not possible, and successful upgrades from development versions are not assured either.

Upgrading
Although upgrades from between any two version pairs are technically possible, it is recommended that all upgrades are conducted from 1.13.2. This means that you should first upgrade your world completely on 1.13.2 using the --forceUpgrade server argument, and then do the same on 1.14.

A Note on CraftBukkit
It has come to my attention that many users are running the craftbukkit.jar produced by BuildTools rather than the spigot.jar. The two different jars exist for a variety of (primarily development-related) reasons, however it must be made clear that Spigot is the supported product on SpigotMC.org. Starting from 1.14 BuildTools will no longer be copying CraftBukkit jars to the output directory, however you may still find them in CraftBukkit/target for the time being. If you feel there is some sort of incompatibility preventing you from using Spigot, then you should treat this is a bug and open a report accordingly.

Bug Reports
Every release I make a statement about bug reports, and every release...
All,

This is a message to let you know that Ubuntu has recently pushed what appears to be a bad kernel update to Ubuntu 18.04 users.

If you are using Ubuntu 18.04, please note that the following kernel appears to have issues handling console input:
4.15.0-44-generic #47-Ubuntu SMP Mon Jan 14 11:26:59 UTC 2019.

Older (e.g. 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018) kernels are not affected.

If you are using this kernel and have a message along the lines of "java.io.IOException: Resource temporarily unavailable", this is the reason.

We are still investigating the exact cause / reason for this.

If you are affected by this issue there are a number of workarounds available (you only need to use one).
  1. Spigot / BungeeCord: Add -Djline.terminal=jline.UnsupportedTerminal to your Java arguments
  2. Spigot: Add --nojline to your Spigot arguments
  3. Reboot your server and select 4.15.0-43, or any other non broken Linux kernel.
  4. Install a non broken kernel: apt install linux-image-4.15.0-43-generic, remove the broken one: apt remove linux-image-4.15.0-44-generic, and reboot.
Please direct any queries to the 1.13.2 discussion thread, or general forums:
https://www.spigotmc.org/threads/344189/

EDIT: Please see the below post for updates.
The Spigot Community Server is once again up and running. The server runs a recent snapshot build (currently 1.14-pre5) and is available for all members to play on.

You can play on it as you wish (survival, creative), but please make sure to respect the gameplay of others. That is if you have access to creative, don't leave valuable resources everywhere or target players in survival. Those with over 100 posts on the forums are eligible to be promoted to a rank which has access to creative. Being banned from the server will also lead to you being banned from the forums.

We are most interested in using this server to find bugs which are not present in either Spigot 1.13.2 or Vanilla snapshots. If you find any, please report them to the issue tracker linked below, after doing appropriate testing on the aforementioned versions. In particular note that there is currently a significant number of Vanilla bugs, and it is very important that you do not waste our time by reporting these.

The main world was generated on 19w03b. Please note that due to ongoing world generation issues, it is possible the world will be reset frequently.

Server: play.spigotmc.org
TeamSpeak: talk.spigotmc.org
Configuration / Issues: https://github.com/SpigotMC/SpigotCraft

Ranks available are based on number of posts:
  • Tester = 100 posts
  • Helper = 500 posts

To request a rank, please use the rank request thread: https://www.spigotmc.org/threads/344229/ not this one.
As the calendar rolls over to 25th of December around the world, I would like to take this time to wish the entire community a very Merry Christmas and a Happy New Year.

Hopefully Santa has stocked the Christmas Tree well and you all get to spend some good times with friends and family.

Happy holidays from all the Spigot Team, and looking forward to 2019.
~md_5