'Java - Write Custom Annotation to make the field transient based on conition

I have an entity class in which I would want to mark the field transient based on some condition

Class TestEntity{
   @column(name="col1")
   private col1;

   @column(name="col2")
   private col2; 

   @column(name="col3")
   private col3;

   // Getter and Setters
}

During some cases I would want to read col3 from database while on few cases, I would want to populate col3 from other data source so in such case I would want to mark col3 as transient.

How do I achieve this? Can we have custom annotation to achieve this or any other elegant way to solve this problem?

Thank you in advance !!

javahibernatejpaannotationstransient


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