How to Resolve Hibernate's 'Could Not Locate Named Parameter' Error

What are the solutions to the Hibernate error: 'Could not locate named parameter even if it exists'?

session.createQuery("FROM EntityName e WHERE e.paramName = :paramValue").setParameter("paramValue", value).list();

The 'Could not locate named parameter' error in Hibernate occurs when a named parameter in a query is referenced incorrectly or is missing in the query context. This can lead to confusion, especially if the parameter is expected to be present but isn't recognized by Hibernate during execution.

// Example of correct usage in Hibernate
Query query = session.createQuery("FROM User u WHERE u.username = :userName")
query.setParameter("userName", "john_doe");
List<User> results = query.list();

Causes

• Incorrect parameter name in the query string.
• Typo in the named parameter when setting its value.
• Using a parameter without defining it in the query context.
• Case sensitivity issues in the parameter name.

Solutions

• Ensure that the parameter name in `setParameter` matches exactly with the named parameter defined in the query.
• Check for typos in both the query string and the parameter setting code.
• Ensure that you define all the parameters you are referencing before executing the query.
• Use `setParameter` with the correct case sensitivity, as parameter names are case-sensitive.

Mistake: Using a different case for the named parameter in the query and in the `setParameter` method.

Solution: Always match the case of the parameter name in both the query and the setting method.

Mistake: Referencing a named parameter that is not defined in the query.

Solution: Define all parameters that you refer to in your query with the `:paramName` syntax.

Mistake: Forgetting to set a parameter before executing the query.

Solution: Always call `setParameter` for all named parameters before executing the query.