Absolute beginner, what does this error in the console mean?

When I try to run my new plugin, I get this:

Code:

Could not load 'plugins\test.jar' in folder 'plugins':
java.lang.InstantiationException

IWhat could this possible mean?
I'll provide any further info.
Thanks!

 

Is that the whole error? o,o
If not please post it.

 

Sure, heres everything else

Code:

08:56:36 [SEVERE] Could not load 'plugins\test.jar' in folder 'plugins':
java.lang.InstantiationException
        at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInst
(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoad
ava:173)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginMana
java:194)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginMan
.java:117)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:1
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:89)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConf
ationManager.java:52)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:13
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:335
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

Also, do you think learning java for bukkit development is hard? Theres jsut so much to remember, its really intimidating me.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Well, if you don't know java it'll be very hard. I had some experiences with programming in langs like PHP and that stuff, so I understand the precept. But if you never developed anything, you should learn java in general first.

I don't know whats causing the error, so I only can help you if you send me the source via PM.

 

ok

 

I guess your jar is incorrect, as otherwise your code would have thrown an exception, not bukkit. How did you generate it?

edit: another possibility is that your plugin's class is not 'public' and thus can't be used by bukkit.

 

That could be it.

I learned java through bukkit, but I already knew C and Python, so I had the syntax and the idea of object oriented programming down.