Only one check constraint is generated when @Min and @Max annotation is used on a single field
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          Key: HV-361
          URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-361
        Project: Hibernate Validator
      Issue Type: Bug
  Affects Versions: 4.1.0.Final
     Environment: Hibernate Core 3.5.5-Final; Hibernate Annotation 3.5.5-Final; Oracle10gDialect
       Reporter: Jens Schauder
       Assignee: Hardy Ferentschik
     Attachments: checkConstraintTest.zip

When generating DDL create scripts fields which have a @Max and @Min annotation only get check constraints for the @Max constraint.

Example entity class:
{noformat}
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;

@Entity
public class TestClass {

 @Id
 private Long id;

 @Max(10)
 @Min(2)
 private Integer min2Max10;

 @Max(99999)
 @Min(0)
 private Integer min0max99;
}
{noformat}

Code used for generating the DDL script:
{noformat}
 public static void main(String[] args) {
   AnnotationConfiguration config = new AnnotationConfiguration()
       .addAnnotatedClass(TestClass.class);
   final String[] script = config
       .generateSchemaCreationScript(new Oracle10gDialect());

   for (String string : script) {
     System.out.println(string);
   }
 }
{noformat}

Resulting output:

{noformat}
create table TestClass (id number(19,0) not null, min0max99 number(10,0) check (min0max99>=0), min2Max10 number(10,0) check (min2Max10>=2), primary key (id))
{noformat}

I tried to locate the problem in the hibernate source code. It might be in the {{applyConstraints}} Method of the {{TypeSafeActivator}} class. It seems that it just *sets* constraints on a column and doesn't make an attempt to merge a min-constraint and a max-constraint into one check constraint.

There is also a related Forum thread regarding this issue: https://forum.hibernate.org/viewtopic.php?f=9&t=1006740

Find the zipped sources for a little test project attached

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