Why doesn't Hibernate L2 cache turn on? - spring-boot

Question

I do not understand why my Hibernate L2 cache doesn't work.
I have Spring Boot application with following configuration
jpa:
database-platform: org.hibernate.dialect.PostgreSQL10Dialect
show-sql: true
properties:
hibernate:
format_sql: true
cache :
use_second_level_cache: true
region :
factory_class: org.hibernate.cache.ehcache.EhCacheRegionFactory
use_query_cache : true
provider_class : net.sf.ehcache.hibernate.SingletonEhCacheProvider
generate_statistics : true
use_structured_entries : true
Following entity mush be cached
#Entity
#Table(name = "employees", schema = "security", catalog = "")
//#SQLDelete(sql = "update security.employees set deleted_ts = current_timestamp where id=?")
//#Where(clause = "deleted_ts is null")
#Cacheable
#org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
class Employee : BaseUuidEntity(), CompanyRelated,UserRelated{
#ManyToOne
#JoinColumn(name = "user_id", nullable = false)
var user: User? = null
#ManyToOne
#JoinColumn(name = "company_id")
var company: Company? = null
#Column(name = "owner")
var owner: Boolean? = null
#ManyToOne
#JoinColumn(name = "role_id")
var role: Role? = null
#ElementCollection
#CollectionTable(
name = "employee_project",
schema = "security",
joinColumns = [JoinColumn(name = "employee_id")]
)
#Column(name = "project_id")
var projectIds: MutableSet<UUID>? = null
override fun getObjUserId(): UUID? {
return user?.id
}
override fun getObjCompanyId(): UUID? {
return company?.id
}
}
But in logs in second page request I have repeated query:
Hibernate:
select
employee0_.id as id1_37_,
employee0_.created_by as created_2_37_,
employee0_.created_ts as created_3_37_,
employee0_.deleted_by as deleted_4_37_,
employee0_.deleted_ts as deleted_5_37_,
employee0_.updated_by as updated_6_37_,
employee0_.updated_ts as updated_7_37_,
employee0_.company_id as company_9_37_,
employee0_.owner as owner8_37_,
employee0_.role_id as role_id10_37_,
employee0_.user_id as user_id11_37_
from
security.employees employee0_
left outer join
security.employee_project projectids1_
on employee0_.id=projectids1_.employee_id
where
projectids1_.project_id=?
The queries are called this way
...
employeeRepository.findByProjectIds(project.id!!)
...
interface EmployeeRepository : JpaSpecRepository<Employee> {
...
#PostFilter("hasObjectPermission(filterObject, 'Employee', 'View')")
fun findByProjectIds(projectId: UUID): MutableList<Employee>
...
You can see full log here https://gist.github.com/iva-nova-e-katerina/37ef0b489cc94d693c6e7640ff01f507
Please teach me how to turn on Hibernate L2 cache?
Probably a bit more TRACE level logs make situation clean:
2022-07-31 10:41:01,085 TRACE [http-nio-8080-exec-8] org.hibernate.type.descriptor.sql.BasicBinder: binding parameter [1] as [OTHER] - [dcc5ff7b-ec8b-45d7-be0f-bcf6a55f1206]
2022-07-31 10:41:01,086 DEBUG [http-nio-8080-exec-8] org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler: Filtering with expression: hasObjectPermission(filterObject, 'Employee', 'View')
2022-07-31 10:41:01,087 DEBUG [http-nio-8080-exec-8] org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler: Filtering collection with 0 elements
2022-07-31 10:41:01,087 DEBUG [http-nio-8080-exec-8] org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler: Retaining elements: []
2022-07-31 10:41:01,088 DEBUG [http-nio-8080-exec-8] org.hibernate.engine.jdbc.spi.SqlStatementLogger:
select
employee0_.id as id1_37_,
employee0_.created_by as created_2_37_,