java.lang.NullPointerException:无法读取数组长度,因为&书信电报;本地3>&引用;是空的
我正在开发一个JDA Discord Bot,每次运行它时,我都会遇到这个异常java.lang.NullPointerException:无法读取数组长度,因为&书信电报;本地3>&引用;是空的,java,nullpointerexception,discord-jda,Java,Nullpointerexception,Discord Jda,我正在开发一个JDA Discord Bot,每次运行它时,我都会遇到这个异常 java.lang.NullPointerException: Cannot read the array length because "<local3>" is null at com.houseofkraft.handler.CommandHandler.scanIndex(CommandHandler.java:42) at com.houseofkraft.c
java.lang.NullPointerException: Cannot read the array length because "<local3>" is null
at com.houseofkraft.handler.CommandHandler.scanIndex(CommandHandler.java:42)
at com.houseofkraft.core.DiscordBot.<init>(DiscordBot.java:68)
at com.houseofkraft.Stratos.main(Stratos.java:13)
Index.java:
package com.houseofkraft.command;
public class Index {
public String[] indexClass;
public String[] getIndexClass() {
return indexClass;
}
public Index() {
String[] indexClass = {
"com.houseofkraft.command.Ping",
"com.houseofkraft.command.Test"
};
}
}
我不太清楚它为什么会导致异常。谢谢
编辑:这是我的DiscordBot代码
public DiscordBot() throws IOException, ParseException, LoginException, InvalidLevelException {
try {
if ((boolean) config.get("writeLogToFile")) {
logger = new Logger(config.get("logFilePath").toString());
} else {
logger = new Logger();
}
logger.debug = debug;
info("Stratos V1");
info("Copyright (c) 2021 houseofkraft");
info("Indexing commands...");
// Add the Commands from the Index
commandHandler.scanIndex(new Index()); // here is the part that I call
info("Done.");
info("Connecting to Discord Instance...");
jda = JDABuilder.createDefault(config.get("token").toString()).addEventListeners(new EventHandler(commandHandler)).build();
if (jda != null) {
info("Connection Successful!");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
在
索引
类中有一个成员变量public String[]indexClass
。在构造函数中,使用
String[] indexClass = {
"com.houseofkraft.command.Ping",
"com.houseofkraft.command.Test"
};
这样,您的成员变量将保持未初始化状态。将构造函数中的代码更改为
this.indexClass = {
"com.houseofkraft.command.Ping",
"com.houseofkraft.command.Test"
};
顺便说一句,成员变量应该是私有的,而不是公共的,因为您希望通过getter访问它(而不是通过CommandHandler中的getter访问)。请发布您的DiscordBot代码-至少是调用CommandHandler#scanIndex的部分。参数索引的值是多少?我刚刚编辑了我的帖子以包含DiscordBot代码。
this.indexClass = {
"com.houseofkraft.command.Ping",
"com.houseofkraft.command.Test"
};