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Jakarta EE vs Spring Interview Questions and Answers

Master Jakarta EE vs Spring with production-ready interview questions covering architecture, dependency injection, transactions, persistence, security, microservices, performance, cloud-native development, enterprise adoption, and senior-level design decisions.

Jakarta EE vs Spring Interview Questions and Answers

Introduction

One of the most common senior Java interview questions is:

"Should we choose Jakarta EE or Spring?"

This question has no universal answer.

Both frameworks are mature, production-proven, and widely used by large enterprises.

Examples include:

  • Banking
  • Insurance
  • Healthcare
  • Airlines
  • Government
  • E-commerce
  • Telecommunications

Many organizations even use both together.

For example:

  • Jakarta Persistence (JPA)
  • Jakarta Bean Validation
  • Jakarta REST
  • CDI

inside Spring Boot applications.

Likewise, Jakarta EE runtimes frequently support MicroProfile specifications for cloud-native development.

The correct choice depends on:

  • Team expertise
  • Existing ecosystem
  • Cloud strategy
  • Vendor requirements
  • Operational model
  • Performance goals
  • Development speed
  • Production support
  • Organizational standards

This guide covers the 15 most frequently asked Jakarta EE vs Spring interview questions with architecture diagrams, production examples, comparisons, and senior-level recommendations.

Q1. What is Jakarta EE?

Answer

Jakarta EE (formerly Java EE) is the enterprise Java platform maintained by the Eclipse Foundation.

It provides standardized specifications for enterprise applications.

Some major specifications include:

  • CDI
  • Jakarta REST
  • Jakarta Persistence (JPA)
  • Bean Validation
  • Servlet
  • JMS
  • Transactions
  • Security

Different vendors provide runtime implementations such as:

  • Open Liberty
  • WildFly
  • Payara
  • GlassFish

Architecture

flowchart TD
    A[Enterprise Application]
    A --> B[Jakarta REST]
    A --> C[CDI]
    A --> D[JPA]
    A --> E[Transactions]
    A --> F[Validation]
    A --> G[Security]
    A --> H[JMS]

    B --> I[Application Server]

Example

@Path("/customers")
public class CustomerResource {

    @GET
    public List<Customer> findAll() {
        return service.findAll();
    }
}

Production Example

Insurance claim processing systems frequently run on Jakarta EE runtimes.

Q2. What is Spring?

Answer

Spring is an open-source application framework that provides a comprehensive ecosystem for Java development.

Spring Boot simplifies application configuration through:

  • Auto Configuration
  • Embedded servers
  • Starter dependencies
  • Production-ready features

Popular Spring projects include:

  • Spring Boot
  • Spring MVC
  • Spring Security
  • Spring Data
  • Spring Cloud
  • Spring Batch
  • Spring Integration
  • Spring AI

Architecture

flowchart TD
    A[Spring Boot]
    A --> B[Spring MVC]
    A --> C[Spring Security]
    A --> D[Spring Data]
    A --> E[Spring Cloud]
    A --> F[Spring Batch]

Example

@RestController
@RequestMapping("/customers")
public class CustomerController {

    @GetMapping
    public List<Customer> findAll() {
        return service.findAll();
    }
}

Q3. What is the biggest difference between Jakarta EE and Spring?

Answer

The biggest difference is their philosophy.

Jakarta EE

  • Specification-based platform
  • Multiple runtime implementations
  • Standard APIs

Spring

  • Framework ecosystem
  • Mostly implemented by Spring itself
  • Opinionated development model

Comparison

Jakarta EE Spring
Specifications Framework
Vendor implementations Spring implementation
Standard APIs Rich ecosystem
Portable Opinionated

Diagram

flowchart LR

A[Jakarta EE Specification]
A --> B[Open Liberty]
A --> C[WildFly]
A --> D[Payara]

E[Spring Framework]
E --> F[Spring Boot]

Q4. Which one is easier to learn?

Answer

Spring Boot is generally easier for beginners because:

  • Better documentation
  • Larger community
  • Auto configuration
  • Massive online resources

Jakarta EE requires understanding:

  • Specifications
  • Runtime behavior
  • Container services

Senior Follow-up

Learning Jakarta EE fundamentals improves understanding of enterprise Java internals.

Q5. Dependency Injection comparison

Jakarta EE

Uses CDI.

@Inject
CustomerService service;

Spring

Uses Spring DI.

@Autowired
CustomerService service;

Constructor injection is recommended.

private final CustomerService service;

public CustomerController(CustomerService service){
    this.service = service;
}

Diagram

flowchart TD
Controller --> Service
Service --> Repository
Repository --> Database

Q6. JPA support comparison

Both frameworks commonly use Jakarta Persistence.

@Entity
public class Customer{}

Spring usually adds:

  • Spring Data JPA
  • Repository abstraction
public interface CustomerRepository
extends JpaRepository<Customer,Long>{}

Jakarta EE

@Inject
EntityManager em;

Spring

@PersistenceContext
EntityManager em;

Q7. Transaction management comparison

Jakarta EE

@Transactional
public void transfer(){}

Spring

@Transactional
public void transfer(){}

The annotation looks identical but is managed by different infrastructure.

Transaction Flow

sequenceDiagram
Client->>Service: invoke
Service->>Transaction Manager: Begin
Transaction Manager->>Database: Execute
Database-->>Transaction Manager: Success
Transaction Manager-->>Service: Commit

Q8. Security comparison

Jakarta EE

  • Jakarta Security
  • IdentityStore
  • SecurityContext

Spring

  • Spring Security
  • OAuth2
  • JWT
  • LDAP
  • SAML

Spring Security provides a significantly richer ecosystem.

Q9. REST API comparison

Jakarta EE

@Path("/orders")

Spring

@RestController
@RequestMapping("/orders")

Both produce REST APIs efficiently.

Q10. Which is better for Microservices?

Spring Boot has traditionally dominated microservices because of:

  • Spring Cloud
  • Spring Boot
  • Spring Security
  • Spring Data

Jakarta EE commonly combines with:

  • MicroProfile
  • Open Liberty
  • Helidon
  • Quarkus

Architecture

flowchart LR

Gateway --> Order

Gateway --> Payment

Gateway --> Inventory

Q11. Performance comparison

Performance depends more on:

  • JVM
  • Database
  • Code quality
  • Network
  • Queries

than framework choice.

Modern Spring Boot and Jakarta EE runtimes have very similar performance for most enterprise workloads.

Q12. Cloud-native comparison

Spring

  • Spring Cloud
  • Kubernetes support
  • Config Server
  • Gateway
  • Discovery

Jakarta EE

  • MicroProfile Config
  • Health
  • Fault Tolerance
  • OpenAPI
  • JWT
  • Telemetry

Q13. Enterprise adoption comparison

Jakarta EE

Common in:

  • IBM
  • Oracle
  • Government
  • Banking

Spring

Common in:

  • Startups
  • Product companies
  • FinTech
  • SaaS
  • Cloud-native systems

Both are heavily used across industries.

Q14. Can Jakarta EE and Spring be used together?

Answer

Yes.

Many Spring applications use Jakarta specifications.

Example:

  • JPA
  • Bean Validation
  • Servlet API

Likewise some Jakarta EE runtimes integrate MicroProfile.

Architecture

flowchart TD

SpringBoot["Spring Boot"] --> JakartaPersistence["Jakarta Persistence"]

SpringBoot["Spring Boot"] --> BeanValidation["Bean Validation"]

SpringBoot["Spring Boot"] --> ServletApi["Servlet API"]

Q15. Which should I choose?

If you are building:

Enterprise Banking

✅ Jakarta EE or Spring

Cloud SaaS

✅ Spring Boot

Government

✅ Jakarta EE

Cloud Microservices

✅ Spring Boot or Jakarta EE + MicroProfile

Large Existing Enterprise

✅ Existing ecosystem usually determines the choice.

Enterprise Architecture Comparison

flowchart LR

Client --> ApiGateway["API Gateway"]

ApiGateway["API Gateway"] --> SpringBootService["Spring Boot Service"]

ApiGateway["API Gateway"] --> JakartaEeService["Jakarta EE Service"]

SpringBootService["Spring Boot Service"] --> Database

JakartaEeService["Jakarta EE Service"] --> Database

Feature Comparison

Feature Jakarta EE Spring
Dependency Injection ✅ CDI ✅ Spring DI
REST ✅ Jakarta REST ✅ Spring MVC
Persistence ✅ JPA ✅ Spring Data JPA
Security Good Excellent
Microservices Excellent with MicroProfile Excellent
Community Large Very Large
Documentation Good Excellent
Auto Configuration Limited Excellent
Cloud Native Excellent Excellent
Learning Curve Moderate Easier

Senior Interview Tips

If asked:

Which framework is better?

Never answer:

Spring is always better.

or

Jakarta EE is outdated.

Instead answer:

Both frameworks are excellent. The choice depends on the organization's ecosystem, operational requirements, cloud strategy, and existing expertise. Spring Boot excels in rapid development and ecosystem breadth, while Jakarta EE provides standardized enterprise APIs with multiple compliant runtime implementations. Modern enterprise applications often combine Jakarta specifications with Spring Boot or use Jakarta EE together with MicroProfile for cloud-native development.

Quick Revision

Concept Jakarta EE Spring
Type Specification Framework
DI CDI Spring DI
REST Jakarta REST Spring MVC
Security Jakarta Security Spring Security
Transactions Jakarta Transactions Spring Tx
JPA Jakarta Persistence Spring Data JPA
Cloud MicroProfile Spring Cloud

Key Takeaways

  • Jakarta EE is a specification-based enterprise platform.
  • Spring is a comprehensive application framework with a large ecosystem.
  • Spring Boot simplifies application setup through auto-configuration and starter dependencies.
  • Jakarta EE emphasizes portability across compliant runtimes.
  • Both frameworks support enterprise-grade REST APIs, transactions, persistence, validation, and security.
  • Spring Boot and Jakarta EE can be used together in the same application where appropriate.
  • MicroProfile extends Jakarta EE with cloud-native capabilities such as Config, Health, Fault Tolerance, OpenAPI, JWT, and Telemetry.
  • Framework selection should be driven by business requirements, team expertise, operational needs, and existing architecture rather than popularity alone.