Top Tweets for #JavaRevision
Spring Boot — Day 2
☕ Revising Core Java to strengthen my fundamentals.
Covered JVM, JRE, JDK, OOP concepts, exception handling & basic collections.
Strong foundation before moving ahead 🚀
#Java #CoreJava #JavaRevision #BackendDevelopment #LearningInPublic #TechJourney
Day 99 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #JPA / #Hibernate
- Understood and implemented the concept of orphanRemoval in JPA mappings
- Learned when orphanRemoval gets triggered in @OneToMany and @OneToOne relationships
- Differentiated orphanRemoval = true vs CascadeType.REMOVE
- Studied real-world use cases where child entities should not exist without the parent
#Java #Backend #Hibernate #JPA #100DaysOfCode
Day 98 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #JPA / #Hibernate
- Went deep into cascading in JPA mappings
- Understood how operations propagate from parent to child entities
- Covered all cascade types: PERSIST, MERGE, REMOVE, REFRESH, DETACH, ALL
- Learned how cascade and orphanRemoval affect real-world data integrity
#Java #Backend #Hibernate #JPA #100DaysOfCode
Day 97 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #SpringDataJPA / #Hibernate
- Understood the concept of owning side vs inverse side in entity relationships
- Learned how the owning side controls the foreign key and database updates
- Worked with One-to-Many / Many-to-One mappings, mappedBy, and @JoinColumn
- Explored cascade operations, orphanRemoval, and why parent entities control child lifecycles
#Java #Hibernate #SpringDataJPA #Backend #100DaysOfCode
Day 96 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #JPA / #Hibernate
- Understood the role of EntityManager as the API to interact with the persistence layer
- Learned how the PersistenceContext acts as a first-level cache for managed entities
- Saw how persist(), find(), and remove() transition entities between Transient -> Persistent -> Removed states
- Understood how it serves data from the PersistenceContext
#Java #Hibernate #JPA #Backend #100DaysOfCode
Day 95 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #Hibernate
- Understood the Hibernate entity lifecycle and its core states: Transient, Persistent, Detached, and Removed
- Learned how entities move between states using operations like persist, save, merge, delete, and detach
- Explored the role of the persistence context and how it manages entity state and synchronization with the database
- Clarified what happens to entities during session operations like clear, close, and garbage collection
#Java #Hibernate #JPA #Backend #100DaysOfCode
Day 94 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #SpringDataJPA
- Understood how sorting works at the data access layer
- Implemented sorting using method queries and the Sort class
- Learned the core concept of pagination and why it matters for APIs
- Worked with Pageable to fetch paginated and sorted results efficiently
#Java #Backend #SpringBoot #SpringDataJPA #100DaysOfCode
Day 93 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #SpringDataJPA
Going deeper into derived query methods and method naming conventions
Understanding how Spring Data generates queries from repository method names
Working with custom JPQL queries using @Query annotation
Comparing JPQL vs native queries and when to use each
#Java #Backend #SpringBoot #JPA #100DaysOfCode
Day 92 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #SpringDataJPA
- Went deep into Spring Data JPA fundamentals
- Worked with different Repository interfaces (CrudRepository, PagingAndSortingRepository, JpaRepository) and understood how they build on each other
- Covered the key features of Spring Data JPA — reducing boilerplate, auto-implemented CRUD, pagination & sorting, and query abstraction
- Got started with the basics of JPQL and how it operates on entities instead of tables
📌 Repository hierarchy & capabilities visualized in the reply 👇
#Java #Spring #Backend #JPA #Hibernate #100DaysOfCode
Day 91 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #SpringJPA / #Hibernate
- Focused on common Hibernate configurations and how they affect persistence behavior
- Worked with entity-level annotations used in real-world JPA mappings
- Understood table-level annotations for defining schema, keys, and constraints
- Revisited the key features of JPA — entity management, JPQL, transactions, and entity relationships
#Java #Backend #Hibernate #JPA #100DaysOfCode
Day 90 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot / #Hibernate
- Diving deep into Hibernate ORM mapping
- Understood the clear separation between Spring Data JPA, JPA (specification), and Hibernate (implementation)
- Learned how Hibernate translates object state changes into SQL and executes them via JDBC
- Got a clearer picture of how repositories, entities, ORM, and the database interact end-to-end
(Architecture flow diagram in the reply 👇)
#Java #Hibernate #JPA #SpringBoot #Backend #100DaysOfCode
Day 89 of #100DaysOfCode (#JavaRevision)
☕ A little detour to #CoreJava today
- Understood the concept of Lambda expressions and why they were introduced
- Worked with functional interfaces and lambda syntax
- Learned how Streams help process collections declaratively
- Practiced common stream operations like map, filter, forEach, and collect
#Java #Backend #100DaysOfCode
Day 88 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Worked on API response transformation
- Defined custom response structures using @ResponseBodyAdvice<Object>
- Applied global response handling with @RestControllerAdvice
- Ensured correct HTTP status codes, error messages, and timestamps in API responses
#Java #SpringBoot #Backend #100DaysOfCode
Day 87 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Worked with exception handling in Spring Boot
- Understood exception handling using annotations at controller and global levels
- Learnt how to return appropriate HTTP status codes and meaningful error messages
- Created custom error response classes for structured API errors
- Annotations of the day :
@ExceptionHandler, @ControllerAdvice
#Java #SpringBoot #Backend #100DaysOfCode
Day 86 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Worked on input validation in Spring Boot
- Understood common validation annotations like @NotNull, @NotBlank, @NotEmpty, and lots of others
- Applied validation at the DTO level to protect the service and persistence layers
- Handled validation exceptions to return meaningful error responses
#Java #Backend #SpringBoot #100DaysOfCode
Day 85 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Understood the role of the Service layer in a Spring Boot application
- How it acts as a mediator between the presentation and persistence layers
- Learned how separation of concerns is maintained between DTOs and Entities using Controllers and Services
- Used ModelMapper to handle clean, bi-directional mapping between Entity and DTO objects
#Java #SpringBoot #Backend #100DaysOfCode
Day 84 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Worked with the persistence layer using Spring Data JPA
- Understood how an ORM works behind the scenes
- Defined and worked with an Entity class in detail (table mapping, primary key, annotations)
- Used Lombok to auto-generate getters, setters, and constructors
- Created a JPA Repository and connected it to the Entity
- Implemented basic CRUD operations through REST APIs and verified everything end-to-end
#Java #Spring #Backend #JPA #Hibernate #100DaysOfCode
Day 83 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Worked with DTOs and used them inside controller methods
- Learned how the Jackson library auto-maps DTO objects to JSON
- Practiced dynamic URL handling using @PathVariable and @RequestParam
- Implemented POST, DELETE, PATCH operations using @PostMapping, @DeleteMapping, and @PatchMapping
- Used Postman to test these different APIs & understanding how @RequestBody handles incoming JSON data
#Java #SpringBoot #Backend #100DaysOfCode
Day 81 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Understood the presentation layer in Spring MVC
- Went deeper into Controllers and DTO (Data Transfer Object) patterns
- Clarified the difference between @Controller and @RestController
- Worked with different request mappings based on various HTTP methods
#Spring #SpringBoot #Java #Backend #100DaysOfCode
Day 79 of #100DaysOfCode (#JavaRevision)
☕ #SpringBoot
- Understood the difference between DTOs vs Entities, and why DTOs matter in APIs
- Understood how a web server works inside Spring Boot (Tomcat, DispatcherServlet, Controller,Response flow)
- Studied how DispatcherServlet routes requests: creates HttpServletRequest/Response, selects handler, invokes controller
- Looked at the MVC layers and how each part keeps separation of concerns
- Learned how HttpMessageConverter handles JSON serialization/deserialization during requests & responses
#Spring #SpringBoot #Java #Backend #100DaysOfCode
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