Tech Trek: A Software Engineer's Guide to Code and Beyond

1. Overview JSON Web Token or JWT ( jot ) for short is an open standard (RFC 7519) that defines a compact, URL-safe means of representing claims to be transferred between two parties.  The claims in a JWT are encoded as a JSON object that is used as the payload of a JSON Web Signature (JWS) structure or as the plaintext of a JSON Web Encryption (JWE) structure, enabling the claims to be digitally signed or integrity protected with a Message Authentication Code (MAC) and/or encrypted. 2. Structure The compacted representation of a signed JWT is a string that has three parts, each separated by a dots (.) : Eg:  eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9 . eyJzdWIiOiJBYmR1bCIsImlhdCI6MTIzNDU2Nzg5MCwiZXhwIjoxMjM0NTY3ODkwLCJuYmYiOjEyMzQ1Njc4OTAsImlzcyI6Imh0dHA6Ly93YWhlZWR0ZWNoYmxvZy5pbiIsInNjb3BlIjpbInJlYWQiLCJ3cml0ZSJdLCJhZG1pbiI6dHJ1ZX0 . Ats92uWxgSjQ8vFgQieK9tpBi66csIFHxkTke70FGlI Each section is Base64Encoded and the first section is called header, the second section ...

Before jumping to @Embeddable and @Embedded annotation. Let me explain about hibernate different objects:          Entity Object o    Entity object are those object which can stand alone like Student or Professor and has its own database identity.          Value Object o    Objects which cannot stand alone like Address as you need to map address with some Entities like Student. It will belongs to an entity, and its persistent state is embedded in the table row of the owning entity In short, always use @Embeddable for the value object and @Embedded with the entity class. Let's understand it by a simple example: We have one Address (Value object) and it is having attributes like city, state, zip code. Now we have two more different entity Student and Professor (Entity Object) . Student or Professor can have Address attributes just by embedding the Address into its Entity. The  @Embedd...

MapperSuperClass ·         A mapped superclass has no separate table defined for it. ·         Designates a class whose mapping information is applied to the entities that inherit from it.  ·         A class designated with the  MappedSuperclass  annotation can be mapped in the same way as an entity except that the mappings will apply only to its subclasses since no table exists for the mapped superclass itself.  ·         When applied to the subclasses the inherited mappings will apply in the context of the subclass tables.  ·         Mapping information may be overridden in such subclasses by using the  AttributeOverride  and  AssociationOverride  annotations or corresponding XML elements. ·         It avoids the cod...