Questions tagged [spring]
Spring is a module based open source framework to build robust Java / Java EE applications.
291
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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 ...
- 101
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votes
1
answer
254
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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
0
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0
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101
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Which design to follow to override a flag from a jar in the application using it?
At my workplace, there are lot of Java/Spring/Spring-Boot based applications which have a common jar added as maven dependency.
This common jar is always used as a SNAPSHOT dependency and I am not ...
- 119
-1
votes
1
answer
42
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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
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2
answers
303
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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
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1
answer
170
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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 ...
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-1
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2
answers
103
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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 ...
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1
answer
27
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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
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1
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86
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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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vote
4
answers
697
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
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0
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97
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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
1
vote
3
answers
170
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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 ...
- 181
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61
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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 ...
- 675
1
vote
1
answer
581
views
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 = ...
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3
answers
527
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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 ...
- 27
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votes
4
answers
978
views
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 ...
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1
answer
85
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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
@...
2
votes
1
answer
1k
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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 ...
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0
votes
2
answers
292
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 ...
- 119
0
votes
0
answers
112
views
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
215
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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 ...
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votes
1
answer
107
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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
2
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4
answers
1k
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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:...
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2
answers
179
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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. ...
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1
answer
131
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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votes
1
answer
412
views
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
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0
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56
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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
290
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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....
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1
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1
answer
186
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 ...
- 295
2
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1
answer
3k
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Best way to handle lazy models with mapstruct and spring transnational 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]
...
- 411
1
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0
answers
79
views
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 ...
- 174
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votes
3
answers
737
views
Should methods with business logic be made private? [duplicate]
So I am writing a project using Spring Boot. All of my logic resides in @Service classes. I have separated each service class based on entity. For example - If I have two independent entities A and B, ...
- 143
1
vote
1
answer
111
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Structure and placement of a exporting module
Its an infrastructure monitoring application.
We have a spring boot (2.x) based Service Oriented Architecture (SOA) with multiple modules in our project and the center point is a REST services module ...
- 59
1
vote
2
answers
476
views
Confusion about layered architecture
Given a layered architecture consisting of
presentation layer
business logic layer
data (access) layer
and a SPA web application communicating through REST endpoints with the backend (eg Angular and ...
- 27
1
vote
2
answers
344
views
Authenticating requests from third party users to our APIs
We have a web app which has certain APIs. Users of our webapp will use these APIs when they login to our webapp (like how many records me as a user do I own, user specific, etc). We are creating ...
- 119
4
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0
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572
views
How to achieve both: clean (hexagonal) architecture with JPA goodies?
How do I achieve two things at the same time writing Java Spring Application:
Clean Architecture
JPA goodies (@Transactional, Optimistic Locking, dirty checking, etc.)
I like the idea of database/...
- 179
3
votes
3
answers
338
views
Layered architecture horizontal dependencies
I'm working on a spring boot REST service.
It's divided into three layers: REST controllers, services, persistence/DAO.
We have multiple services and persistence repositories. We have the following ...
- 39
1
vote
1
answer
155
views
Where to handle duplicate key exceptions in multy layer application
+-------------+ +--------+ +----------+
| repository +-------->+service +------->+controller|
+-------------+ +-^------+ +------------+
+-------------+ | ...
0
votes
1
answer
6k
views
Best practice for references in DTOs and entities in Spring
Given the following architecture and frameworks:
Spring Boot Application with Spring Data JPA (Hibernate is used as OR mapper); layered architecture as followed.
REST layer
Service layer
Persistence ...
- 27
0
votes
2
answers
2k
views
How to design front-end to handle multiple back-end versions
In my company, we're using Spring Boot to implement backend API and React to implement frontend including Web interface and Android/iOS apps.
Since our product is an Enterprise software, customers ...
- 245
5
votes
3
answers
635
views
How to avoid DI dependency cycle for observer pattern
In my project I'm using the observer pattern in several places, i.e. the subject notifies the observers about something, and expect them to act. The subject does not know anything about the details of ...
- 169
1
vote
2
answers
117
views
Web server archicture
This may seem like an odd question but it's something I've yet to find a "proper" answer for. I've tried googling but I don't get anything useful (maybe I'm looking for the wrong terms).
I'm ...
1
vote
1
answer
429
views
Spring Boot/Batch: Should every Job be separate Maven module?
I'm building a backend service powered by Spring Batch which enables to define and Jobs.
Currently, I have several jobs, that essentially, aren't related one to another.
So,
I have one application....
- 89
2
votes
1
answer
569
views
How to build a modular/extensible Spring Boot application?
I'm developing a Spring boot / Batch application.
What I'd like to do is to have a separated module for every job. This is a reasonable decision because different tasks (Spring Batch Job) have ...
- 89
1
vote
0
answers
5k
views
Spring Data MongoDB: Update document based on multiple identifiers with Composite ID vs. MongoTemplate upsert vs. MongoRepository find & save
I'm wondering for best practices to upsert a document based on two identifiers.
@Document(collection = "cars")
public class CarEntity {
@Id
private ObjectId id;
private String ...
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votes
1
answer
6k
views
Is it okay to have one Service with two different Repositories in Spring Boot MVC?
I have a backend Spring Boot API that should have one(?) endpoint that returns some statistics to display in a frontend. These statistics are calculated from data that comes from two different ...
- 109
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votes
2
answers
156
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is this microservice design fine?
I have recently decided upon a micro service design to merge two Spring Boot applications.
I basically have 2 applications that deliver two entirely different front ends, but share user accounts.
...
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3
votes
2
answers
876
views
Where to save JWT token?
We(in my company) use to save the JWT token in the cookie. The web application is on Spring boot + JSP application. So the flow is, in a successful login service send a JWT token, that token has been ...
- 295
2
votes
1
answer
132
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Handling OAuth 2.0 access token
I am creating a rest template to consume REST API secured by OAuth 2.0.
The provider has implemented an expiry for the access token for 5 mins. So Using the rest template, I will be calling the ...
- 181
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1
answer
78
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Where Should You Add a Shared Maven Module as a Dependency in an N-tier Architecture
In a simple web architecture using Spring and Maven where it consists of following layers:
Controller
Service
Repository
Shared
Where in shared module all the classes that are used among different ...
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