Passing empty list as parameter to JPA query throws error

Question

If I pass an empty list into a JPA query, I get an error. For example:

List municipalities = myDao.findAll();  // returns empty list
em.c         


        

Answer 1

Assuming the SQL query to be like

(COALESCE(:placeHolderName,NULL) IS NULL OR Column_Name in (:placeHolderName))

Now, If the List is of type String then you can pass as

query.setParameterList("placeHolderName", 
!CollectionUtils.isEmpty(list)? list : new ArrayList(Arrays.asList("")).

And If the List is containing the Integer values then the syntax is like below:

If(!CollectionUtils.isEmpty(list)){
query.setParameterList("placeHolderName",list)
}else{
query.setParameter("placeHolderName",null, Hibernate.INTEGER)
}