What does this mean???

Discussion in 'Bukkit Help' started by 9XWolfX9, Nov 25, 2012.

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    16:20:13 [SEVERE] Could not load 'plugins/LWC.jar' in folder 'plugins'
    org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: Bad version number in .class file
    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:577)
    at org.bukkit.Bukkit.reload(Bukkit.java:183)
    at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)
    at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:494)
    at net.minecraft.server.DedicatedServer.al(DedicatedServer.java:258)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:223)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
    Caused by: java.lang.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    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:317)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:242)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:143)

    This is what comes up in my Terminal (on mac) when i try to get a plugin.. PLEASE HELP ME!!
  2. what java version you using?? looks to me your java is outdated
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    Are you seeing that ALL peoples are gettting this error?
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    LWC can't load due to UnsupportedClassVersionError which means a bad version nunber in the .class file. Not by LWC but by Bukkit.

    This shouldn't affect your server in any way, but make sure to warn people that LWC is disabled due to glitches which it would not boot up.
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    When it says UnsupportedClassVersionError, it means LWC was compiled under (most likely) Java 7 and not Java 6.
    Or you just need to update Java.
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    actually, then it says unsupported minor major version 51.0
    on here, OP is using java 5 with a java 6 plugin
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    Well it's not just LWC. It's with almost ever plugin. The thing I it only does this on my desktop, on my laptop it doesn't. I have server on the laptop but my older brother is always using the laptop. So I just need to know if I can fix this problem?

    Wait do I just need to update java?

    EDIT by Moderator: merged posts, please use the edit button instead of double posting.
    Last edited by a moderator: May 30, 2016
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    Yeah, that's all.
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    Ok Thanks!

    What Java version do i need?

    EDIT by Moderator: merged posts, please use the edit button instead of double posting.
    Last edited by a moderator: May 30, 2016
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    When you're updating it anyway, take the latest (somewhere in 7).
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