Bukkit

What steps will reproduce the problem?
1. Start the server while plugin is installed
2.
3.
I am using the latest version. I think this mod is a great idea. but when i run it it says:
15:12:40 [SEVERE] Could not load 'plugins/BookText.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: pl/mineville/ajaw/Main : Unsupported major.minor version 51.0
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:154)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:227)
    at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:576)
    at org.bukkit.Bukkit.reload(Bukkit.java:183)
    at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:185)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)
    at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:911)
    at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:824)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:806)
    at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:282)
    at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:111)
    at net.minecraft.server.ServerConnection.b(SourceFile:35)
    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:569)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:215)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:486)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:419)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:818)
Caused by: java.lang.UnsupportedClassVersionError: pl/mineville/ajaw/Main : Unsupported major.minor version 51.0
    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:44)
    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:143)
    ... 21 more

Does the same thing on the newest build of book text. Im now running bukkit beta build for 1.4

@Glorysaber: Go

Have you tried the latest build of the plugin? It is updated to Bukkit 1.4.2-R2

I get the exact same error with latest version (0.3) :(

Running CraftBukkit version git-Bukkit-1.4.2-R0.2-b2455jnks (MC: 1.4.2) (Implementing API version 1.4.2-R0.2)

You are propably using Java 6 instead of the 7. Try updating it.

@AJAW132: Go

Yeah, that was my thought too so updated to Java 7 but error persists :/

UPDATE: On a whim, I tried my old method for running the server which is to say, I downloaded JRE 7 (http://www.oracle.com/technetwork/java/javase/downloads/java-se-jre-7-download-432155.html) and changed the usual:

java -Xms1024M -Xmx1024M -jar craftbukkit.jar -o true
PAUSE

TO THIS:

"%ProgramFiles%\Java\jre7\bin\java.exe" -Xms1024M -Xmx1024M -jar craftbukkit.jar -o true
PAUSE

And it now works :) So FYI to anyone else with this problem.

@Glorysaber: Try the method I outlined above :)