Questions tagged [spring]
Spring is a module based open source framework to build robust Java / Java EE applications.
310 questions
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How to communicate API Limit between multiple applications?
We currently have 3 Spring boot applications (with multiple instances across machines each) that communicate with an API via HTTP that is not in our hands.
This API has a limit on a per-day as well as ...
- 171
2
votes
2
answers
242
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Best way to add asynchronous execution for already implemented synchronous process
I have a complex process implemented in Java Spring microservice.
Currently this process is triggered on user request and it is synchronously executed.
This often results in a gateway timeout.
...
- 235
3
votes
2
answers
493
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Why do I need an authorisation server if my micro services can validate JWTs directly?
I'm working on a Spring-based micro service project and considering different approaches for handling authentication and authorization. Instead of setting up a dedicated authorization server, I'm ...
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1
answer
220
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Why was integration tests using Spring Test framework designed to need @Transactional annotation in the @Test method by default?
Based on the documentation on Spring testing: https://docs.spring.io/spring-framework/reference/testing/testcontext-framework/tx.html#testcontext-tx-enabling-transactions
Annotating a test method ...
- 1,935
0
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0
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93
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Disable tenants in multi tenant SaaS app
I am building an app where I have tenants and each tenant can have multiple users. The users can do multiple things in the application and these functionalities also are kind of independent from each ...
- 37
2
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2
answers
765
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How should I implement data access with jpa to meet Clean Architecture/DDD
For the last few days I'm searching any information about compatibility of JPA and Clean Architecture/DDD. I found next ideas for decoupling application from hibernate.
Do not use @ManyToMany or @...
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3
votes
3
answers
1k
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Should business logic classes be POJO only?
I read about three-tier architecture and I have a question: I read that in business logic (that is, what is in logic tier) there should be POJO classes, but in most Spring manuals these classes are ...
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1
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0
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83
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Best practice: slightly different logic on multi mapping endpoint
Suppose I've got a spring controller as follows:
⋮
@RestController
public class MyController {
⋮
@PostMapping(value = { "publicAPI/addItem", "internalAPI/addItem" })
...
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6
votes
3
answers
1k
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Hexagonal Architecture + Domain Driven Design. How to perform a correct implementation?
Currently, I am trying to implement these two architectures together with Java and Spring (although technology shouldn't matter I think).
But I'm encountering problems getting them to work together.
I ...
- 171
0
votes
2
answers
398
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Where perform mapping in strict Domain-Driven Design?
I want to create an example application where we use a strict domain-driven design and layering (controller, service, repository). Most notably, we have a clear distinction between the domain and the ...
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1
answer
128
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How to format request and response
I am new to backend REST API development. I am creating the CRUD APIs for books using spring boot.
I have a model class lets say 'user'. It will have many fields, like id, name, email, status, ...
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votes
1
answer
203
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Spring/Java multiple shared modules for different databases
I'm implementing a software based on the micro-service architecture using Spring/Java. Each micro-service connects to either a PostgreSQL or a MongoDB database. Is it standard practice to have a ...
0
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1
answer
150
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Where to put getOrSave responsibility?
I have many repeated parts of service logic which just fetches object if it exists or returns a newly saved one.
I want to move it from service because it just clutters up the logic. But I do not ...
- 235
2
votes
3
answers
1k
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How can I avoid duplicate annotations when validating both Entity and DTOs?
I am using the Spring Boot framework to create a RESTFUL API and I need a way to avoid the duplication of validation rules when using multiple DTOs as request/response objects for my endpoints.
Using ...
-3
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1
answer
173
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Learn a framework on a project, or mix languages between backend services [closed]
I am designing my next project, which will do various domain-specific tasks, but all that will be controlled and used via a generic crud web app.
I have been professionally using Java with Spring for ...
- 13
2
votes
1
answer
734
views
Rest API Layered Architecture Java / Spring / JPA
Currently, all REST applications I work with have a three-layered architecture:
Persistence -> Contains "entity" classes with JPA annotations / Spring Data JPA repositories
Core -> ...
0
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0
answers
131
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Spring data exchange between components?
Please advise me what pattern to use in following case:
I have a Java/Spring Boot application. There is a component with @KafkaListener method which receives Kafka Messages on CRUD of various subject ...
- 107
0
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1
answer
132
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Should I use method overloading or method overriding when creating converter service
In a Java Spring API, I'm implementing GeoJson Conversion Service to convert different types to geojson, I have GeoJsonConversionService interface, and one implementation is ...
- 103
1
vote
1
answer
667
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The recommended Spring Boot project structure leads to repetitive code
When implementing projects in Spring Boot (especially CRUD applications), I often find myself writing a lot of repetitive code that just calls functions and services from lower layers. For example, ...
- 13
1
vote
4
answers
1k
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Microservices distributed lock mechanism
I am using spring boot with mongo db (azure cosmos db) in my microservices. Currently I have an Orders collection that stores Orders. These documents have a field userId that is null when the document ...
- 19
0
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0
answers
584
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How to pass the entity's domain to the repository layer - clean architecture and spring JPA
According to Should I use a layer between service and repository for a clean architecture - Spring the Peristance layer is deprecated because the Repository is already an abstraction.
UML solution of ...
- 111
0
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1
answer
3k
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Spring Boot - How to return mocked data based on spring profile
I have a Spring Boot REST API application that uses different profiles like dev, test, prod, etc
It also makes a call to another API to retrieve some data like:
Client ---> MYAPI ---> ...
- 119
-1
votes
1
answer
62
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Picking data store for Location Tracking Based Application
I have one design problem for one of my projects based on location tracking. The scenario is I have multiple devices(for some business) all over the city and have GPS installed inside, the device is ...
0
votes
2
answers
777
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Microservices - create post for logged in user
I am working on a small project with microservices architecture in Spring Boot. As to not make unnecessary calls to users-microservice, I have duplicated some necessary User data (id, name, summary, ...
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-1
votes
1
answer
301
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API request and response from event consumer
How to expose an API using the traditonal request-response style while internally it handles it in event driven way (pure or partially event driven), given that if callback style may not be possible ...
- 109
-1
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2
answers
146
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Best practices for API design for an E-Commerce System
I have a few basic questions on how to implement an API for a basic e-commerce system.
The relevant entities are Customer, Puffle, and Review. Each Puffle can have zero or more Reviews. Each Review is ...
0
votes
1
answer
45
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Modularized authentication providers for Spring application
At our company, we have multiple products which share authentication settings. In particular, we use Spring LDAP, but since our use case and configuration is more complex, we would like to use ...
- 300
0
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1
answer
135
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Am I understanding OAuth2 correctly and is what I am trying to achieve possible?
I am creating a web application which has three distinct components as far as I understand. A Nuxt frontend, and Spring Boot backend and Google OAuth2 for authentication using OpenID Connect. Nuxt can ...
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1
vote
4
answers
1k
views
Are static classes/methods good for pure business logic?
I have a service class that performs some operations.
One of the operations is a piece of code long enough to warrant extracting to a new class and unit test it in isolation:
@Service
public class ...
- 119
0
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0
answers
117
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Design : How to divide the responsibility in micro services
I have two micro services built using spring boot,
One micro service is: "payment" Which handles actions related to payments.
Like creating a payment link.
Getting the latest status of ...
- 101
2
votes
3
answers
391
views
Exposing multiple classes from the representive package for one entity
I have a simple app for storing the movies, that exposes REST API. I am using spring-boot. I am using this simple app as an example, however, the question is more about general good practice.
I am ...
- 227
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0
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121
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How should I handle keys in production
I'm creating an authorisation service, which does signing using a key.
For local development I was randomly generating a key on application start-up.
Now I'm deploying to the cloud (currently going ...
- 685
2
votes
1
answer
3k
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Implementing transactional entity lockouts with Spring and JPA
Spring Boot/Java 8/MySQL here.
I have a widgets table in my MySQL DB that is modeled by a JPA entity like so:
@Entity
@Table(name = "widgets")
@Data
public class Widget {
@Column(name = ...
0
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3
answers
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Is it an anti-pattern to extract common configuration code as a library and reuse it across microservices?
Is it an anti-pattern to extract common configuration code as a library and reuse it across microservices?
I am breaking down a monolith app into a few of microservices. What I stumbled upon is: since ...
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4
answers
2k
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Frontend/backend SPA communication: how to handle a list of string options
I have single page application with an Angular frontend and a Spring REST-backend.
What is the proper way to handle a list of string-based options in the fronted the enduser can select from, which ...
- 1
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3
answers
336
views
How best to structure my Service/Repository layers when persisting a Many to One object?
I'm working on a project where I need to do CRUD operations on Book and Library objects. Naturally the relationship between Book and Library is Many to One, like so:
@Entity
@Getter
@Setter
@...
4
votes
1
answer
2k
views
Authentication with JWT in HTTP only cookie without refresh token
The motto of the upcoming question is "I don't know what I don't know".
I would like to know if there are downsides or security risks with an authentication implementation.
Right now, I'm ...
- 153
0
votes
2
answers
1k
views
Which design pattern to use to make a mix of in-sequence and parallel HTTP calls?
We have to make a bunch of HTTP calls from Java/Spring-Boot application which will be mix of in-sequence and parallel.
Level 1 : We make 3 parallel calls to Services 1 , 2 and 3
Level 2: After service ...
- 111
0
votes
0
answers
288
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Using JWT token to create spring session
I have a web application like this:
An angular frontend for client and a spring MVC backend for admin panel.
A angular web application requests a JWT token from tomcat/spring MVC.
The angular ...
- 101
0
votes
1
answer
481
views
How to use single Spring-Boot instance to cater to multiple environments?
We have a Spring-Boot Web application currently deployed to 7 environments (DEV, SIT, UAT, Pre-Prod, Prod, etc.). This application connects to other REST services, which has different URLs for each of ...
- 111
-2
votes
2
answers
215
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Approach to build a modularity Java (Web) Application
I'm on the way to build a modular Java web project with some pluggable modules - like Jira and Confluence for example.
My first thought was to build a project with Spring and OSGi, I started finding a ...
- 265
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votes
4
answers
2k
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How to compare passwords which is stored in DB in encrypted form in secure way?
Recently In an interview I was asked this question -
Question- If are storing passwords in encrypted format in DB and in future when user login into our website how will we perform authentication?
Me:...
- 147
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2
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562
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Interface and Implementation Classes
I know various forms of this question have come up before, but none of them quite seem to answer in a way that I can apply to / understand in relation to what I regularly see others doing. ...
0
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1
answer
303
views
Does it make sense to create a WAR anymore?
This is more specific to spring boot projects and applications whose main USP is its APIs. Now that we can simply create a JAR file deploy it anywhere, what is the point of WARs? Is there a specific ...
- 143
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1
answer
670
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Spring Boot + MongoDB project structure and database creation
I'm planning to start a new Spring Boot project with MongoDB. I'm very familiar with Spring Boot, but all of my past projects used MySQL.
Each of my projects has the following directory, that holds ...
- 103
0
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0
answers
90
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How can I design a secure content verification web application?
In my country, there is a high number of fraudulent doctor's sick letter as they are manually written on paper. I'm designing a web application to combat this issue and have the whole process ...
2
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0
answers
582
views
Determining when to use Serverless vs Containerized application (AWS Lambda vs ECS) - Is Java Spring dead?
I work for an organization that heavily leverages AWS. There is a strong push that every team move from containers deployed on ECS to leverage AWS Lambda and step functions for (almost) every project....
- 129
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1
answer
737
views
What are the best way to publish application event in a spring boot application?
My goal is to collect/publish different types of information from the application. We use Kafka for the event bus. Consider the following sample code.
class UserService {
public User ...
- 315
3
votes
1
answer
6k
views
Best way to handle lazy models with mapstruct and spring transactional scope
In a typical Java Spring Web APP:
we have the following layers:
Model [DB Models]
Repositories [where you have queries to DB]
Services [Business service where you have the @Transactional annotation]
...
- 501
2
votes
0
answers
177
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Reusable module using spring framework with spring-boot application modules?
I have a maven module which will handle DB interactions for various scenarios. I want this module to use spring framework so we can leverage the standard DI and integration test capabilities. This ...
- 184