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I am running the latest spigot (CraftBukkit version git-Spigot-47b1dff-f233e7d (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT)) on which I am trying to make Essentials work (I tried ver stable 2.13.1 and dev 2.14.98). The server runs on Linux (CentOS) with Java 1.7.0_02 (2 GB of allocated heap).

When starting the server dumps at some point a Java stack:

(...)

 [17:54:11 INFO]: [Essentials] Enabling Essentials v2.13.1

[17:54:11 INFO]: Bukkit version format changed. Version not checked.

[17:54:11 INFO]: git-Spigot-47b1dff-f233e7d (MC: 1.8)

[17:54:11 INFO]: 1.8-R0.1-SNAPSHOT

[17:54:11 INFO]: Creating config from template: /root/spigot/plugins/Essentials/config.yml

[17:54:11 INFO]: Creating empty config: /root/spigot/plugins/Essentials/upgrades-done.yml

[17:54:11 ERROR]: java.lang.NoSuchMethodError: com.google.common.cache.CacheBuilder.maximumSize(I)Lcom/google/common/cache/CacheBuilder;

[17:54:11 ERROR]: Error occurred while enabling Essentials v2.13.1 (Is it up to date?)

java.lang.NoSuchMethodError: com.google.common.cache.CacheBuilder.maximumSize(I)Lcom/google/common/cache/CacheBuilder;

        at com.earth2me.essentials.UserMap.<init>(UserMap.java:27) ~[?:?]

        at com.earth2me.essentials.Essentials.onEnable(Essentials.java:195) ~[?:?]

        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:355) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:315) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [spigot-1.8.jar:git-Spigot-47b1dff-f233e7d]

        at java.lang.Thread.run(Thread.java:722) [?:1.7.0_02]

[17:54:11 INFO]: [EssentialsXMPP] Enabling EssentialsXMPP v2.13.1

[17:54:11 INFO]: [EssentialsChat] Enabling EssentialsChat v2.13.1

[17:54:11 INFO]: [EssentialsProtect] Enabling EssentialsProtect v2.13.1

[17:54:11 ERROR]: Essentials not installed or failed to load. Essenials Protect is in emergency mode now.

[17:54:11 INFO]: [EssentialsSpawn] Enabling EssentialsSpawn v2.13.1

[17:54:11 INFO]: [EssentialsAntiBuild] Enabling EssentialsAntiBuild v2.13.1

[17:54:11 INFO]: [EssentialsGeoIP] Enabling EssentialsGeoIP v2.13.1

I can connect to the server but Essentials failed to load, I get a Essential Protect in Emergency Mode message in the game.

I did not chnage anything in the auto-generated Essentials' config.yml file. Since it is too big to be uploaded, I made it available on dropbox.

Is there something I should do to fix this (I am brand new to Minecraft, sorry if this is something obvious)

Foreword: You are using a SNAPSHOT of Spigot. Snapshots by definition are regular builds of the code that are in development. This means they are mostly unstable and should not be used for anything more than testing. Now on to further analysis of the problem.

The version of essentials Stable build is meant for 1.7.2 version of bukkit as stated on their bukkit dev page.

R: Essentials-2.13.1 for CB 1.7.2-R0.3 Mar 26, 2014

All indications of the dev build points that they are using Bukkit API #1945

#1945 1.7.10-R0.1

This is from the Bukkit API builds page. Indicating that API build #1945 is ment for 1.7.10

Optimize player / user iteration.

* Add a method for backwards compatability with unmapped code.

* Convert all getOnlinePlayers() calls to use this method, part of the IEssentials interface

* Add a new method getOnlineUsers() Ljava/lang/Iterable;

* Convert appropriate calls to use this method

* Update Bukkit to #1945

* Update CraftBukkit to #3103

This is quoted from the git commits of the dev builds of essentials. I cant confirm the version of CraftBukkit being used due to the DMCA take down of their build server.

Im not sure of the API changes but as far as I know, MC 1.8 has a huge amount of code overhaul that may and probably will break past APIs. Simply put, they may just not be compatible until essentials update to 1.8

Try the one from here, it should be working ;)

https://hub.spigotmc.org/jenkins/job/Spigot-Essentials/