Java IllegalArgumentException: entityList must not be empty - Solution and Explanation

This error is thrown when you are trying to perform an operation on a list of entities, but the list is empty. The error message 'Error: entityList must not be empty' is indicating that the list of entities should have at least one element. \n\nTo fix this issue, you need to ensure that the list of entities is not empty before performing any operations on it. You can do this by adding a check to verify if the list is empty before proceeding with the operation. \n\nHere's an example of how you can check if the list is empty: \n\njava \nif (entityList.isEmpty()) { \n\tthrow new IllegalArgumentException('Error: entityList must not be empty'); \n} \n\n// Perform operations on the entityList \n \n\nBy adding this check, you can prevent the IllegalArgumentException from being thrown when the list of entities is empty.'}