How do I resolve ClassNotFoundException?

A ClassNotFoundException occurs when the Java virtual machine (JVM) is unable to find a class that has been referenced in your code. This can happen for a number of reasons, including:

1. The class is not in the classpath: If the class is not in the classpath, the JVM will be unable to find it when it is referenced in your code. Make sure that the class is in the classpath and that the classpath is set correctly. When using build tools like Maven or Gradle, verify that the required dependency is declared in your pom.xml or build.gradle file.
2. The class name is spelled incorrectly: Make sure that the class name is spelled correctly in your code and that it matches the name of the class file.
3. The class is not in the correct package: Make sure that the class is in the correct package and that the package declaration in your code exactly matches the directory path on the file system.
4. There is a problem with the class file: If the class file is corrupt or otherwise invalid, it may not be possible to load it. Make sure that the class file is in a good condition.

public class Main {
    public static void main(String[] args) {
        try {
            // Throws ClassNotFoundException if the class isn't on the classpath
            Class.forName("com.example.MissingClass");
        } catch (ClassNotFoundException e) {
            System.out.println("Class not found: " + e.getMessage());
        }
    }
}

To resolve a ClassNotFoundException, you will need to identify the cause of the exception and take the appropriate action to fix it. This may involve adding the missing class to the classpath, correcting the class name or package, or replacing a corrupt class file.