Exception in thread "main" java.lang.NoClassDefFoundError launch error
Question: I have the typical error in Java. I have the next structure:

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

My **Main.java** code is:

    
    
    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");
        }
    }
    

When I launch it like this:

    
    
    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
    

I got error:

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

I found in this post the solution **[Exception in thread"main"
java.lang.NoClassDefFoundError:
Hello](http://stackoverflow.com/questions/22431904/exception-in-thread-main-
java-lang-noclassdeffounderror-hello)**

And my try:

    
    
    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
    

works perfectly. The problem is I can launch this code only from src/
folder((( Is there any way I can launch it from
**/src/junior/databases/homework** folder? I need to go back to src each time
I want to launch the code.


Answer: Here you are, assuming you are in `src/junior/databases/homework` directory:

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

