Hql Join - Path Expected for Join! Hibernate

HQL ERROR: Path expected for join

select u from UserGroup ug inner join ug.user u 
where ug.group_id = :groupId 
order by u.lastname

As a named query:

@NamedQuery(
  name = "User.findByGroupId",
  query =
    "SELECT u FROM UserGroup ug " +
    "INNER JOIN ug.user u WHERE ug.group_id = :groupId ORDER BY u.lastname"
)

Use paths in the HQL statement, from one entity to the other. See the Hibernate documentation on HQL and joins for details.

Hibernate - Path expected for join

In JPQL / HQL you do not need to specify the ON clause for the join because Hibernate already knows the mappings between the two entities and the columns required to generate said join.

So you really only need to supply the predicatesand the request to perform the join as follows

SELECT u FROM User u 
  JOIN u.roles ur
 WHERE u.username = :username
   AND u.password = :password
   AND ur.userRole = :role

why do I get Path expected for join when I use join key word in hql

We need to provide path in HQL query.
That's the "Path expected for join" the exception is coming.

change query something like below: Please edit as per use

String FIND_PRODUCT_CLASS_ID = "SELECT pc.id FROM ProductClass pc"+ 
" JOIN pc.ProductGroup pg " +
" JOIN pg.Product p " +
" JOIN p.ProductSub ps WHERE ps.id =:childProductSubId";'

Please refer this.

Path expected for join

org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join!

The above exception is talking about join should use a path from one entity to other defined in the mapping.

Your entities show that CheckOutHistory and ProcessUpdateFile are collection members of ASSET.

Instead of

from Asset a
inner join processupdatefile puf 

We need a path from ASSET to ProcessUpdateFile, i.e.

from Asset a
inner join a.postUpdateFiles puf 

The HQL should look like:

select 
    puf.processedOn,
    coh.checkedOutOn 
from Asset a 
inner join a.postUpdateFiles puf 
    on a.assetSerialNumber = puf.assetSerialNumber 
inner join a.checkOutHistories coh 
    on a.assetSerialNumber = coh.assetSerialNumber 
where a.assetSerialNumber =: assetno

HQL Error - Path expected for join

I guess it happens because joins are allowed only between entities where relations are set.

Try to use WHERE instead

SELECT s1.labelId, s1.type, s1.timestamp  
FROM LabelStatistics s1, LabelStatistics s2
WHERE s1.labelId = s2.labelId  and s1.type = s2.type and s1.timestamp < s2.timestamp

Path expected for join hql hibernate

Bear in mind that hql joins are not the same as regular sql joins.

With hql you perform queries on entities instead of tables.

So joins are performed for fields contained within an entity.

Assuming your product class contains a List or Set of PromotionCodeCategory called "categories" and your PromotionCodeCategory contains a List or Set of Voucher called "vouchers", then your query should look like this:

@Query("SELECT p.serviceName, p.category, v.code from Product p " 
    + " INNER JOIN p.categories AS cp " 
    + " INNER JOIN cp.vouchers as v " 
    + " WHERE v.code = xxx")

---

Edit

It's been noted that there are only two entities: Product and Voucher. Hence your classes should look like this:

@Entity
@Table(name = "products")
public class Product { 
  
    @ManyToMany(cascade = { CascadeType.ALL })
    @JoinTable(
        name = "product_voucher",   // insert join table name here
        joinColumns = { @JoinColumn(name = "product_id") }, // insert product column name from join table here 
        inverseJoinColumns = { @JoinColumn(name = "voucher_id") } // // insert voucher column name from join table here
    )
    Set<Voucher> vouchers = new HashSet<>();
    
    // standard constructor/getters/setters
}

    
@Entity
@Table(name = "vouchers")
public class Voucher {    
  
    @ManyToMany(mappedBy = "vouchers")
    private Set<Product> products = new HashSet<>();
     
    // standard constructors/getters/setters   
}

Then the join query should look like this:

@Query("SELECT p.serviceName, p.category, v.code from Product p " 
    + " INNER JOIN p.vouchers AS v " 
    + " WHERE v.code = xxx")

Hope this helps

Spring Boot JPA: Path expected for join

also, don't change entity names, if you want to point to table with different name then entity use:

@Entity
@Table(name = "security_tokens")
class SecurityToken {
}

instead of

@Entity(name = 'security_tokens')
class SecurityToken {
}

then query:

@Query("FROM SecurityToken st where st.type.label = :type AND st.account.id = :accountId")

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