What Does “could Not Find Or Load Main Class” Mean?

The error "Could not find or load main class" in Java usually occurs when the Java Virtual Machine (JVM) is unable to locate the main class specified in the command line arguments while trying to run a Java program.

This error can occur due to several reasons:

  1. Classpath issue: The main class is not present in the specified classpath or the classpath is not set correctly.

  2. Package/Directories issue: If the main class is inside a package, the directory structure might not be correctly aligned with the package structure.

  3. Compilation issue: The main class might not have been compiled or compiled successfully.

  4. Incorrect class name: The main class name specified in the command line arguments might not match the actual class name.

  5. File name mismatch: The Java source file name and the class name specified inside the file might not match.

To resolve this issue, ensure that:

  • The main class is compiled without any errors.
  • The class file is in the correct directory or package structure.
  • The classpath is properly set when running the Java program.
  • The main class name specified in the command line arguments matches the actual class name.

About the Author Rex

I'm a passionate tech blogger with an insatiable love for programming! From my early days tinkering with code, I've delved into web dev, mobile apps, and AI. Sharing insights and tutorials with the world is my joy, connecting me to a global community of like-minded tech enthusiasts. Python holds a special place in my heart, but I embrace all challenges. Constantly learning, I attend tech conferences, contribute to open-source projects, and engage in code review sessions. My ultimate goal is to inspire the next generation of developers and contribute positively to the ever-evolving tech landscape. Let's code together!