Why Is My IntelliJ IDEA Project Throwing a `java.lang.ClassNotFoundException`?

Java.lang.ClassNotFoundException Error in IntelliJ IDEA

When attempting to run a database application in IntelliJ IDEA, you may encounter the following error:

java.lang.ClassNotFoundException: Table

This error indicates that Java is unable to locate the Table class file in the project's db subdirectory. To resolve this issue, consider the following possibilities:

• Ensure the correct main class is selected in the run/debug configuration.
• Verify that Table.java is included in compilation and has not been intentionally excluded due to errors.
• Check that the "Build" step is not skipped during the run/debug configuration process.
• Configure a valid "Source root" in the project structure for the directory containing the db subdirectory.
• Review the Table.java package statement to ensure its accuracy and location.
• Avoid using colons (:) or semicolons (;) in the project's classpath configuration.
• Examine the project's Java version and ensure it matches the required version.
• Address any known bugs related to Java project templates or module file naming.
• If you're on Windows, disable the "Use Unicode UTF-8 for worldwide language support" setting in the Region settings.
• Ensure that module dependencies are stored in IntelliJ IDEA format, avoiding potential issues with Eclipse format storage.

By addressing these potential causes, you can ensure that your Java application runs successfully in IntelliJ IDEA without encountering the java.lang.ClassNotFoundException error.

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