方法明显存在时出现NoSuchMethodError [英] NoSuchMethodError when the method obviously exists

问题描述

  20:15:43 [INFO] macintosh264发出服务器命令：/卖出手
 20:15:43 [INFO] [XYZShop] MacCommand卖出执行
 20:15:43 [SEVERE] null 
 org.bukkit.command.CommandException：未处理的异常在插件XYZShop v0.1.3中执行命令'sell'，位于org.bukkit.command.PluginCommand.execute（PluginCommand .java：46）org.bukkit.command.SimpleCommandMap.dispatch（SimpleCommandMap.java:186）
（org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand（CraftServer.java:510）
 net.minecraft.server.v1_4_6.PlayerConnection.handleCommand（PlayerConnection.java:979）上的b $ b net.minecraft.server.v1_4_6.PlayerConnection.chat（PlayerConnection.java:897）上的b $ b net.minecraft.server.v1_4_6.Packet3Chat.handle（Packet3Chat.java:44）的net.minecraft.server.v1_4_6.PlayerConnection.a（PlayerConnection.java:852）
 net.minecraft。 server.v1_4_6.NetworkManager.b（NetworkManager.java:290）
在net.minecraft.server.v1_4_6.PlayerConnection.d（PlayerConnection.java:112）在net.minecraft.server.v1_4_6.ServerConnection.b（SourceFile：39）
在net.minecraft.server .v1_4_6.DedicatedServerConnection.b（SourceFile：30）
在net.minecraft.server.v1_4_6.MinecraftServer.r（MinecraftServer.java:598）
在net.minecraft.server.v1_4_6.DedicatedServer.r （DedicatedServer.java:224）net.minecraft.server.v1_4_6.MinecraftServer.q（MinecraftServer.java:494）
 net.minecraft.server.v1_4_6.MinecraftServer.run（MinecraftServer.java） ：427）net.minecraft.server.v1_4_6.ThreadServerApplication.run（SourceFile：849）上的
原因：java.lang.NoSuchMethodError：dev.xyzcraft.net.database.DatabaseHandler.getItem（IS Ldev / xyzcraft / net / xyzshop / dataObject / MSItem; dev.xyzcraft.net.xyzshop.commands.SellCommand.onCommand上的
（SellCommand.java:63）dev.xyzcraft.net.xyzshop.util.MacCommand.onCommand（MacCommand.java:44）上的
 
 at org.bukkit.command.PluginCommand.execute（PluginCommand.java:44）
 ...另外15个
  

我得到了例外

这是代码：
https://github.com/macintosh264/XYZShop

最后，我正在使用Mod API名为Bukkit的热门视频游戏《我的世界》。这是JavaDoc和库

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

http://jd.bukkit.org

我在使用MySQL的另一个项目中也遇到了这个问题，并且无论何时使用mysql，都会发生堆栈跟踪使用

• Macintosh264

解决方案

似乎您尝试执行的任何内容（即保存命令的方法）都无法正确读取它。尝试重新打包您的项目，这在我身上已经发生过很多次了，通常这很容易解决。

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

I get that exception

here's the code: https://github.com/macintosh264/XYZShop

Lastly, I'm using a Mod API for a popular video game, Minecraft, entitled Bukkit. Here's the JavaDoc, and library

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

http://jd.bukkit.org

"I also have this problem with another project that uses MySQL, and the stack trace occurs WHENEVER the mysql class is used. "

• Macintosh264

解决方案

It seems like whatever your trying to execute (i.e.the method that holds the command) isn't reading it properly. Try re-packaging your project, it's happened to me many times and that is usually an easy fix.

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