java - JPA Entity Mapping which is related based on two other entity mappings -


not sure if possible trying map workflowinstanceplayer player related based on 2 other entity mappings, workactionclass , workflowinstance in entity below.

public class action implements serializable { @id private long action_id;  @manytoone @joincolumn(name = "work_action_class_id", referencedcolumnname = "work_action_class_id") private workactionclass workactionclass;  @manytoone @joincolumn(name = "workflow_instance_id", referencedcolumnname = "workflow_instance_id") private workflowinstance workflowinstance;  update: how can map workflowinstanceplayer player?????  @manytoone  @joincolumns( {         @joincolumn(name = "workflow_instance_id", referencedcolumnname = "workflow_instance_id", insertable = false, updatable = false),         @joincolumn(name = "workactionclass.role_class_id", referencedcolumnname = "role_class_id", insertable = false, updatable = false) })  private workflowinstanceplayer player;


workflowinstanceplayer derived based on workflow_instance_id , role_class_id role_class_id attibute of workactionclass mapped above (workactionclass.role_class_id) 


public class workflowinstanceplayer implements serializable { @id private workflowinstance workflowinstance;  @id private roleclass roleclass;  @manytoone @joincolumn(name = "badge", referencedcolumnname = "badge") private employee employee; 


public class workactionclass implements serializable { @id @generatedvalue(strategy = generationtype.sequence, generator = "trx_seq") private long work_action_class_id;  @manytoone @joincolumn(name = "role_class_id") private roleclass roleclass;

example data be:

action ------ id = 10 work_action_class_id = 7 workflow_instance_id = 2   workactionclass --------------- id = 7 role_name = reviewer role_class_id = 3   workflowinstanceplayer ---------------------- workflow_instance_id = 2 role_class_id = 3 badge = 111222

so in action entity, i'll know workflow instance player employee id 111222 without storing badge in action table.

update

based on vlad's post tweaked 

@manytoone(fetch=fetchtype.lazy)    @joincolumnsorformulas({    @joincolumnorformula(formula=@joinformula(value="(select a.role_class_id (use table name not entity name here) a.work_action_class_id = work_action_class_id)", referencedcolumnname="role_class_id")),    @joincolumnorformula(column = @joincolumn(name="workflow_instance_id", referencedcolumnname="workflow_instance_id")) })

try mapping:

@manytoone @joincolumn(     name = "workflow_instance_id",      referencedcolumnname = "workflow_instance_id",     insertable = false,      updatable = false ) private workflowinstance workflowinstance;  @manytoone @joincolumnorformula(     formula = @joinformula(             value="(select a.work_action_class_id workactionclass a.role_class_id = role_class_id)",          referencedcolumnname = "work_action_class_id"     ) ) private workactionclass workactionclass;  @manytoone @joincolumns( {     @joincolumn(         name = "workflow_instance_id",          referencedcolumnname = "workflow_instance_id"),     @joincolumn(         name = "role_class_id",          referencedcolumnname = "role_class_id") }) private workflowinstanceplayer player;

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