How to Solve java.lang.ClassNotFoundException Errors in IntelliJ IDEA?

Troubleshooting java.lang.ClassNotFoundException in IntelliJ IDEA

The formidable java.lang.ClassNotFoundException error arises when IntelliJ IDEA attempts to execute a program but fails to locate the associated class files within the project's output directory. Here are potential culprits and their respective remedies:

1. Meticulously Choose the Main Class

Ensure that the correct main class is designated in the run/debug configuration. An erroneous selection leads to the inability to find the entry point of your application.

2. Verify Compilation Inclusion

Confirm that the problematic class (e.g., Table.java) is not inadvertently excluded from compilation due to previous errors or intentional omission. Reintroduce it to the compilation process to resolve the issue.

3. Execute Build Step Before Launch

The Build step in the Run/Debug configuration ensures code compilation before execution. Disable or review this setting to guarantee that the required class files are generated prior to program launch.

4. Configure Source Root

Establish a Source root within the project structure for the directory housing the problematic class. This ensures that IntelliJ IDEA recognizes the source code's location.

5. Check Package Declaration

Validate that the package statement within the problematic class aligns with its proper package or location. Misconfigurations can lead to classpath discrepancies.

6. Avoid Conflicting Characters in Project Path

Avoid special characters such as colons (:) or semicolons (;) in the project path. These characters invalidate the classpath and prevent execution. Additionally, verify that Finder (MacOS) does not misrepresent colons as slashes.

7. Digital Signing Considerations

If the problematic class relies on digitally signed dependent jars, ensure that the resulting artifact does not inherit the partial signature, preventing execution.

8. Java Version Compatibility

Confirm that the project is configured to use the appropriate Java version for compilation.

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