Spring Data JPA - "No Property Found for Type" Exception

This exception is usually thrown when Spring Data JPA cannot resolve a property name in a derived query method or a custom @Query annotation. It typically happens due to a typo in the method name or a missing field in the entity class.

For example, if you use a custom query like this: @Query("SELECT p FROM Person p WHERE p.age > 20") And you do not have an age property in the Person entity class, you will get this exception.

To fix this, make sure that you are accessing properties that exist in the entity class. Ensure the entity is properly mapped with JPA annotations:

@Entity
public class Person {
    @Id
    private Long id;
    private int age; // Correctly mapped field
    // ...
}

If you are trying to access a property that is not directly mapped to a column in the database, you cannot use it in standard JPQL queries. Instead, you can use the @Query annotation to write a custom JPQL or native SQL query that explicitly specifies the database column names. This can be useful if you want to select only a subset of the properties in the entity class or work with legacy schema mappings.