Why Does My Java Code Throw a 'Could Not Find or Load Main Class' Error?

Error While Running Java Code: "Could Not Find or Load Main Class"

In Java programming, an error message stating "Error: Could not find or load main class [duplicate]" often signifies that the compiler cannot locate the main class specified in the "java" command.

To resolve this issue, ensure that the target class you want to execute is present in the current directory or specified as part of the classpath. The classpath defines the locations where the Java Virtual Machine (JVM) should search for classes and resources.

In the provided code, the "SpatialModel" class is defined as the main class within the "SpatialModel.java" file. To successfully execute the code, the classpath should include the current directory (".") where the ".class" file resides.

To modify the classpath, append the following to the "java" command:

-cp .

In Windows environments, use a semicolon (;) as the classpath separator:

-cp .;

With this modification, the updated command would be:

java -cp .;apache-log4j-1.2.16/log4j-1.2.16.jar:vensim.jar SpatialModel vars

By adding the current directory to the classpath, the JVM can now locate the "SpatialModel" main class, allowing the code to execute successfully.

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