How to resolve the issue of idea’s class not loading.

There are several possible solutions.

1. Check the classpath for classes: Ensure that the classpath for classes is correctly set. This includes verifying if the directory where the classes are located is in the classpath, or if they are in the correct JAR file.
2. Check the namespace of the class: Ensure that the namespace of the class matches its actual location. For example, if the full name of the class is com.example.MyClass, then it should be located in the com/example/MyClass.class file.
3. Check dependencies of the class: If the class depends on other classes, make sure that these classes can also load correctly. If there are missing dependencies, you can try manually adding them to the classpath.
4. Cleaning and rebuilding: If you are using a build tool like Maven or Gradle, try cleaning the build and rebuilding the project. This will ensure that all classes are compiled correctly and included in the right location.
5. Checking the class loader: Sometimes, there may be issues with the class loader. Try using a different class loader to load the class, or check if the class loader is properly configured.

If the above methods don’t work, you can try searching for relevant error messages or logs to understand more about the specific reasons for the class loading failure, and then take corresponding solutions based on the specific situation.