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Is it possible for a JPA entity to have a field which is not mapped to any column in the data base table. Basically I need to store some additional data on my front end but I do not want to create an extra column in the table for this.
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Introduction. When persisting Java objects into database records using an Object-Relational Mapping (ORM) framework, we often want to ignore certain fields. If the framework is compliant with the Java Persistence API (JPA), we can add the @Transient annotation to these fields.
There are a number of different ways you can handle it but it really is situational. If your table without a key has a foreign key into another table that does have an id, you can use the @Embedded annotation.
To ignore a field, annotate it with @Transient so it will not be mapped by hibernate.
Let's start with the @Column annotation. It is an optional annotation that enables you to customize the mapping between the entity attribute and the database column.
Just mark the field or getter with @javax.persistence.Transient annotation.
The data stored there will not be persisted, nor the ddl generator, if you use any, will pick that one up as an additional column of the table.
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Marking @Transient annotation solve this problem but it will work after restart host server(application/web).
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