Getting error Could not locate appropriate constructor on class

This exception happens because JPA doesn't change column types returned from the database for native queries. Because of this, you have type mismatch. I'm not sure about which column causes this problem in your case (this depends on DBMS you use), but I would suspect you have BigInteger in the result set instead of Integer for score column. To be 100% sure, add a breakpoint to ConstructorResultColumnProcessor.resolveConstructor(Class targetClass, List<Type> types) and investigate. After you find a mismatch, change field type in your mapping class.

Another solution will be not to use @SqlResultSetMapping at all. As your CourseCompletion class is a managed entity, you should be able to map native query to it directly. See this question for more information.

Adding a break point to the ConstructorResultColumnProcessor.resolveConstructor worked for me. My query had a rowNum selection and it's mapped as BigDecimal type. I was having the constructor with a BigInteger.