Question

I’m experimenting with JPA queries but keep getting an error on the following query

SELECT p
FROM usertype_permissions up
JOIN permissions p ON up.PERMISSION_ID = p.ID
WHERE up.USERTYPE_ID = 1

Error:

Caused by: java.lang.IllegalArgumentException: An exception occurred while
creating a query in EntityManager: 

Exception Description: Syntax error parsing the query
[SELECT p
FROM usertype_permissions up
JOIN permissions p ON up.PERMISSION_ID = p.ID
WHERE up.USERTYPE_ID = 1].

Answer 1

In JPQL you have to use Entity names (by default it’s the name of the Java class), to me it looks weird that usertype_permissions is an Entity name / Java class…

It looks like you are using table names and the word after join has to refer to an attribute of a class e.g. l.books

Example:

@Entity
public class Lib implements Serializable {
      @OneToMany
      private Set<Book> books;
}

@Entity
public class Book implements Serializable {
      @OneToOne
      private Lib lib;
}

a JPQL query would look like this:

SELECT l FROM Lib JOIN l.books books