Why Does My Java Code Throw 'Error: Could not find or load main class,' and How Can I Fix It?

Error: Could not find or Load Main Class

When attempting to compile and execute Java code, users may encounter the error message "Error: Could not find or load main class." This error occurs when the Java Virtual Machine (JVM) cannot locate the main class that contains the main() method, the entry point for a Java application.

To resolve this issue, you must ensure that the JVM can access the compiled class file (.class) for your main class. To do this, you need to add the location of the .class file to the classpath used by the JVM.

In your case, the problem is that the compiled code for the SpatialModel class is not in the classpath specified when you ran the java command:

To fix this, you need to add the current directory (where the SpatialModel.class file is located) to the classpath:

Note that the Windows classpath separator is a semi-colon (;) instead of a colon (:). If you are using a Windows system, you would need to use the following classpath:

Once you have added the correct classpath to the java command, you should be able to run your Java code without encountering the "Could not find or load main class" error.

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