| Here is how i build my Select using JPA criteria API, builder bein my CriteriaBuilder
CriteriaQuery<MyDto> crit = builder.createQuery(MyDto.class).distinct(true);
Root<MyEntity> root = crit.from(MyEntity.class);
List<Expression<?>> listFields = new ArrayList<>();
listFields.add(root.get("intField"));
listFields.add(root.get("stringField"));
listFields.add(builder.<Boolean> selectCase().when(
builder.isTrue(root.<Boolean> get("booleanField")), true).otherwise(false));
listFields.add(builder.literal(false));
Expression[] arraySelect = listFields.toArray(new Expression[listFields.size()]);
crit.multiselect(arraySelect);
And My obj has a constructor :
public MyDto(Long pIntAttr, String pStringAttr, boolean pBooleanAttr1, boolean pBooleanAttr2) {
}
I was using hibernate 4 and had a nullpointer on the handler so after looking in the net, and seeing there was now a BooleanValueHandler in Hibernate 5, I upgraded. now the error i get is :
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [mypackage.MyDto]. Expected arguments are: long, java.lang.String, boolean [select distinct new mypackage.MyDto(generatedAlias0.intField, generatedAlias0.stringField, case when generatedAlias1.booleanField = true then true else false end, false) from myEntityPackage.MyEntity as generatedAlias0]
If i replace the literal(false) by literal(0) and I change the type of pBooleanAttr2 to Integer in the constructor, it works fine. If I keep the boolean but remove it from the constructor, it tells me i have 4 fields in my select and only 3 in the constructor. So what am I missing ? Of course my query is more complex than this. |