Why won't astyanax (java) recognize my @Id annotated values in my scala case class parameter list? -

so here's dilemma: have domain model bunch of case classes in scala such user , organization. within data access layer (dao, repository, etc) using astyanax(a java library netflix) , it's entity persister save object cassandra column family.

here sample code cassandra/astyanax-backed daos (yes know need more scala-ish, i'm still learning =))

after reading through long-winded description, i'm looking see why annotated vals in param list won't work when java getdeclaredannotations() on field hate have go , refactor can use persister makes simple save entity (i.e. manager.put(entity)). if want keep using case classes can work more immutable style scala , lens scalaz, i'll have update dao , persisting manually can kill time.

so, if knows i'm not seeing, please let me know! in advance taking time read through this.

scenario 1 - case class

astyanax fails pick annotation @id on val

 @entity case class organization(@id @column(name = "id") override val id: option[uuid] = none,                         @column(name = "created_on") override val createdon: option[date] = none,                         @column(name = "modified_on") override val modifiedon: option[date] = none,                         @column(name = "name") name: option[string] = none,                         @column(name = "is_paid_account") ispaidaccount: boolean = false) extends idbaseentity[uuid](id, createdon, modifiedon) 

scenario 2 - class companion object or class without companion object

astyanax fails pick @id annotation on val

 @entity class organization(@id @column(name = "id") override val id: option[uuid] = none,                        @column(name = "created_on") override val createdon: option[date] = none,                        @column(name = "modified_on") override val modifiedon: option[date] = none,                        @column(name = "name") name: option[string] = none,                        @column(name = "is_paid_account") ispaidaccount: boolean = false) extends idbaseentity[uuid](id, createdon, modifiedon)  object organization {   def apply(id: option[uuid] = none,             createdon: option[date] = none,             modifiedon: option[date] = none,             name: option[string] = none,             ispaidaccount: boolean = false) = new organization(id, createdon, modifiedon, name, ispaidaccount) } 

scenario 3 - case class or class val defined inside block

this works fine because picks theid being annotated @id, don't want do because idbaseentity defines , id val , defeats whole purpose of inheritance , being able pass id superclass

 @entity case class organization(@id @column(name = "id") override val id: option[uuid] = none,                         @column(name = "created_on") override val createdon: option[date] = none,                         @column(name = "modified_on") override val modifiedon: option[date] = none,                         @column(name = "name") name: option[string] = none,                         @column(name = "is_paid_account") ispaidaccount: boolean = false) extends idbaseentity[uuid](id, createdon, modifiedon) {   @id @column(name = "id") val theid: option[uuid] = id } 

the data access portion

way down in manager see call build(). astyanax examines class passed in withentitytype(), in case classof[organization]

every 1 of scenarios fails except #3 when have val declared inside class block instead of parameter list case class or regular class/regular class companion object. astyanax says there know member of class annotated @id throws exception. before dig further, figured ask community nuances of annotation scala class , sending java library reflection. source nothing special. in fact here relevant lines things fail: https://github.com/netflix/astyanax/blob/master/astyanax-entity-mapper/src/main/java/com/netflix/astyanax/entitystore/entitymapper.java#l89-120

 class cassandraorganizationdao extends basecassandradao[organization, uuid](astyanax.context) organizationdao {   val columnfamilyorganizations: columnfamily[uuid, string] = new columnfamily[uuid, string](     "organizations",     timeuuidserializer.get(),     stringserializer.get(),     bytebufferserializer.get())    val columnfamilyorganizationmembers: columnfamily[uuid, uuid] = new columnfamily[uuid, uuid](     "organization_members",     timeuuidserializer.get(),     timeuuidserializer.get(),     dateserializer.get())    val manager: entitymanager[organization, uuid] = new defaultentitymanager.builder[organization, uuid]()     .withentitytype(classof[organization])     .withkeyspace(getkeyspace())     .withcolumnfamily(columnfamilyorganizations)     .build()   // rest of class omitted  } 

i came across similar issue, annotation never taken in account in constructor's fields. indeed, used springdata , impossible directly map annotation (like @indexed) on field.

to enable annotations in case class's constructor, should first create kind of class:

object fixedscalaannotations {   type id = com.packagecontainingid.id @field //replace right package   type column = com.packagecontainingcolumn.column @field } 

and import in case class , use instead of original:

import fixedscalaannotations._  @entity case class organization(@id @column(name = "id") override val id: option[uuid] = none,                         @column(name = "created_on") override val createdon: option[date] = none,                         @column(name = "modified_on") override val modifiedon: option[date] = none,                         @column(name = "name") name: option[string] = none,                         @column(name = "is_paid_account") ispaidaccount: boolean = false) extends idbaseentity[uuid](id, createdon, modifiedon) 

be sure original packages aren't used.

here related article dealing jpa: http://blog.fakod.eu/2010/07/14/constructor-arguments-with-jpa-annotations/