The java run can't find or load the main class

time：2025-05-19 08:01:17 Tech Trends

What does it mean that the main class cannot be found or cannot be loaded in java

"The main class could not be found or loaded" is an error that occurs in Java programs, meaning that the Java Virtual Machine cannot find or load the entry point of the program, which is the main class.

This error can be caused by several reasons:

1. The program does not specify a major class: The Java program needs to specify a major class as the entry point of the program, and if the main class is not specified, then the Java Virtual Machine will not be able to find the entry point of the program, resulting in an error.

2. The package path where the main class is located is not set correctly: Classes in Java programs are usually organized according to the package structure, and if the package path where the main class is located is not set correctly, then the Java Virtual Machine will not be able to find the main class.

3. Wrong classpath setting: Java programs need to find class files through classpaths when they are running. If the classpath is set incorrectly, the Java Virtual Machine will not be able to find the classes in the program.

4. Compilation errors: If a Java program has an error when compiling, then the compiler will not be able to generate the correct class file. At runtime, the Java Virtual Machine is unable to find the correct class file and an error is reported.

5. Class files are missing or corrupted: If the class files on which the program depends are missing or corrupted, then the Java Virtual Machine will not be able to find the correct class.

6. Java version mismatches, missing external library files that the program depends on, and misconfigurations of operating system or environment variables can also cause this issue.

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