Java Interop with Clojure, could not load the plugin - clojure

Question

I'm trying to write a Bukkit plugin in Clojure.
Generally a Bukkit plugin needs to override the Plugin class, have an onEnable() and a onDisable() method.
There are also a few other requires, like the result being in a JAR file and a plugin.yml defined, but I have all that.
(ns net.jonnay.watershipdown.WatershipDown
(:import org.bukkit.Bukkit
org.bukkit.plugin.Plugin)
(:gen-class
:name net.jonnay.watershipdown.WatershipDown
:extends org.bukkit.plugin.Plugin
:methods [ [onEnable [] void]
[onDisable [] void] ]
)
)
(set! *warn-on-reflection* true)
(defn debug-to-mc-log [^String msg]
(let [logger (Bukkit/getLogger)]
(. logger info (str "(DEBUG) " msg))))
(defn -onEnable []
(debug-to-mc-log "Enabled Watership down. Super Clojure Powers!"))
(defn -onDisable []
(debug-to-mc-log "Disabled Watership down."))
My code compiles just fine, but when I try to load it in the server, I get this exception:
13:29:20 [SEVERE] Could not load 'plugins/watershipdown-0.1.jar' in folder 'plugins':
java.lang.ClassFormatError: Duplicate method name&signature in class file net/jonnay/watershipdown/WatershipDown
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:285)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:200)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:156)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:132)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:407)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Answer 1

Are onEnable and onDisable defined in Plugin?
If so, they might be causing the issue.
The genClass documentation specifically says that you shouldn't redeclare inherited methods.