线程异常 "main" java.lang.NoClassDefFoundError 启动错误

Question

我有 Java 中的典型错误。我有下一个结构：

bin/
lib/
src/
   junior/
         databases/
                  homework/Main.java

我的Main.java代码是：

package junior.databases.homework;

import java.sql.*;

public class Main {
    private static Connection connection = null;

    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        initDatabase();
        System.out.println("Done");
    }

    private static void initDatabase() throws SQLException, ClassNotFoundException {
        Class.forName("org.postgresql.Driver");

        connection = DriverManager.getConnection(
                    "jdbc:postgresql://192.168.136.129:5432/postgres", "postgres", "xxxx");
    }
}

当我这样启动它时：

root@debian:/python_codes/Junior/Level1/DB1/ORM/java/java/src/junior/databases/homework# javac Main.java
root@debian:/python_codes/Junior/Level1/DB1/ORM/java/java/src/junior/databases/homework#java Main

我收到错误：

Exception in thread "main" java.lang.NoClassDefFoundError: Main (wrong name: junior/databases/homework/Main)

我在这个 post 中找到了解决方案 Exception in thread "main" java.lang.NoClassDefFoundError: Hello

我的尝试：

root@debian:/python_codes/Junior/Level1/DB1/ORM/java/java/src# javac junior/databases/homework/Main.java
root@debian:/python_codes/Junior/Level1/DB1/ORM/java/java/src# java junior.databases.homework.Main

完美运行。问题是我只能从 src/ 文件夹启动这段代码（（（有什么办法可以从 /src/junior/databases/homework 文件夹启动它吗？我需要回到 src 每个是时候启动代码了。

Answer 1

给你，假设你在 src/junior/databases/homework 目录中：

javac ../../../junior/databases/homework/Main.java
java -cp ../../../ junior.databases.homework.Main

线程异常 "main" java.lang.NoClassDefFoundError 启动错误

Exception in thread "main" java.lang.NoClassDefFoundError launch error

java

classnotfoundexception