当方法明显存在时，java NoSuchMethodError

Question

20:15:43 [INFO] macintosh264 issued server command: /sell hand
20:15:43 [INFO] [XYZShop] MacCommand sell executed
20:15:43 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'sell' in plugin XYZShop v0.1.3
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
        at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:510)
        at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:979)
        at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:897)
        at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:852)
        at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
        at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
        at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
        at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
        at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
        at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
        at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
        at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NoSuchMethodError: dev.xyzcraft.net.database.DatabaseHandler.getItem(IS)Ldev/xyzcraft/net/xyzshop/dataObject/MSItem;
        at dev.xyzcraft.net.xyzshop.commands.SellCommand.onCommand(SellCommand.java:63)
        at dev.xyzcraft.net.xyzshop.util.MacCommand.onCommand(MacCommand.java:44)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 15 more

我有个例外

以下是代码： https://github.com/macintosh264/XYZShop

最后，我正在为一款名为Bukkit的流行视频游戏Minecraft使用Mod API。这是JavaDoc和库

http://dl.bukkit.org/downloads/bukkit/

http://jd.bukkit.org

“我在另一个使用MySQL的项目中也遇到了这个问题，每当使用MySQL类时，都会出现堆栈跟踪。”

• Macintosh264

Answer 1

似乎无论您试图执行什么（即，保存命令的方法）都没有正确读取它。试着重新打包你的项目，这在我身上发生过很多次，这通常是一个很容易解决的问题