java.lang.NullPointerException while trying to update sql table - sql

Question

i'm trying to update "PA49_Debut"column with :
- the"PA49_Debut" value from the second table if the product exists there
- else "PA49_Debut" from the same table if the product exists in the previous rows
- else "PA49_Actuel" from the same table
take a look to the code in the repository
public interface FSrepository extends JpaRepository<FSmodel, String> {
#Transactional
#Modifying
#Query("Update FSmodel FS Set FS.PA49_Debut = CASE WHEN EXISTES (SELECT 1 FROM ISmodel SI where FS.Partnumber=SI.Partnumber)" +
" THEN SI.PA49 " +
"WHEN EXISTS (SELECT 1 FROM FSmodel FS2 WHERE FS.Partnumber=FS2.Partnumber AND FS.id>FS2.id )" +
" THEN FS2.PA49_Debut "+
" ELSE (FS.PA49_Actuel) "
+ "END" )
void setPA49Debut(); ```
these are my ISmodel and FSmodel entities
#Entity
public class FSmodel {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
public Long id;
public String Partnumber;
public String Materialgroup;
public String Warehouse;
public Float Value;
public Float Stock;
public Float PA49_Actuel;
public Float PA49_Debut;
public String article_fg;
public Float Priceperunit;}
#Entity
public class ISmodel {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
public Long id;
public String Partnumber;
public String Materialgroup;
public String Warehouse;
public Float Stock;
public Float Value;
public Float PA49;
public Float STPA49; }
and that is the error
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'controller': Unsatisfied dependency expressed through field 'FSrepos'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'FSrepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract void com.example.demo2.repository.FSrepository.setPA49Debut()!
Caused by: java.lang.NullPointerException: null
Any help would be greatly appreciated. Thanks.

Answer 1

the solution to NullPointerException: null is to
try #Query(vaue="your query goes here",nativeQuery = true)
as #stacker said but i found out that there is a lot of mistakes in my code,i'll try to explain them in hope it helps someone else.
The first
CASE WHEN EXISTES spelled wrongly. Have to be written CASE WHEN EXISTS #alex
The second is using SI out of the select statement i resolved this problem by adding a new select statement.
The third mistake is to update my table by subquery the same table in those lines "WHEN EXISTS (SELECT 1 FROM FSmodel FS2 WHERE FS.Partnumber=FS2.Partnumber AND FS.id>FS2.id )" +
" THEN FS2.PA49_Debut "
and i found the solution as well as the explanation here
Eventually this is my final code and it works great
#Transactional
#Modifying
#Query(value="Update FSmodel FS Set FS.PA49_Debut = CASE" +
" WHEN exists(SELECT SI.Partnumber FROM ISmodel SI where FS.Partnumber=SI.Partnumber)"
+ " THEN (select distinct S.PA49 from ISmodel S where FS.Partnumber=S.Partnumber)" +
"WHEN exists(SELECT 1 FroM (SELECT * FROM FSmodel) AS FSd WHERE FS.Partnumber=FSd.Partnumber AND FS.id>FSd.id )"
+ " THEN (select distinct F.PA49_Debut from (SELECT * FROM FSmodel) AS F where FS.Partnumber=F.Partnumber AND FS.id>F.id)+1" +
" ELSE (FS.PA49_Actuel )" + "END",nativeQuery = true)
void setPA49Debut();