Why Am I Getting the 'Error: Main Method Not Found in Class' in Java?

Error: Main Method Not Found in Class

Introduction

Java programmers may encounter errors such as "Error: Main method not found in class MyClass" when attempting to run a Java program. This error indicates an issue with the entry point method required for running the program.

Understanding the Main Method

When executing a Java application from the command line (using the "java" command), the Java Runtime Environment (JRE) searches for the "main" method in the specified class. This entry point method serves as the starting point for the program.

Requirements for the Main Method

To be considered a valid entry point, the "main" method must satisfy the following requirements:

• Located within the nominated class
• Name must be "main" (case-sensitive)
• Public accessibility
• Static (non-instance) method
• Return type of void
• Single argument of type String[]

If any of these requirements are not met, the error "Error: Main method not found..." will be displayed.

Common Causes of the Error

• Missing or misnamed "main" method
• Non-public "main" method
• "main" method not static
• "main" method returning a non-void value
• Incorrect or missing String[] argument
• Incorrect type for String[] argument

Troubleshooting Steps

To resolve the error, thoroughly check the following:

• Ensure the presence and correct spelling of the "main" method.
• Confirm that the "main" method is declared as public.
• Make sure the "main" method is declared as static.
• Verify that the return type of the "main" method is void.
• Ensure the method has a single argument of type String[].
• Check that the type of the String[] argument is correct (java.lang.String).
• Consider using varargs syntax (String... args) for the String[] argument.

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