Addressing the "ClassNotFoundException" Error in IntelliJ IDEA
When encountering a "ClassNotFoundException" error while running a Java program in IntelliJ IDEA, the issue arises during runtime rather than compilation. To rectify this, it's crucial to pinpoint the underlying cause.
Root Causes and Solutions:
- Incorrect Main Class: Verify that the designated main class in the run/debug configuration is correct.
- Excluded Table.java: Ensure that the Table.java file is not excluded from the compilation process due to errors or intentional omission.
- Missing Build Step: Include the "Build" step in the "Before Launch" section of the run/debug configuration to ensure proper compilation.
- Source Root Misconfiguration: Define a "Source Root" for the directory containing the db subdirectory if it's not already specified.
- Package Errors: Confirm that Table.java has the correct package statement or has not been moved to a different package.
- Path Concerns: Ensure that the project path does not contain colons on Mac/Linux or semicolons on Windows.
- Digitally Signed Jars: Avoid using digitally signed dependent jars, as it may hinder execution.
- Java Version Discrepancy: Match the Java version used for compilation with the project settings.
- Untitled Module: Correct the module name in .idea/modules.xml if it references an invalid file named untitled104.iml.
- Unicode UTF-8 Setting on Windows: Disable the "Use Unicode UTF-8 for worldwide language support" setting in Windows Region Settings.
- Eclipse Dependency Format: Switch to IntelliJ IDEA format dependencies for modules to avoid source root configuration loss.
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