Questions tagged [spring]

Spring is a module based open source framework to build robust Java / Java EE applications.

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38 views

Using one database with different applications

I am working on an educational project in my school. I am creating an e-commerce store with a web-app and android and iOS app (flutter). I am learning on the fly, would it be possible to say, use one ...
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1answer
30 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 ...
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45 views

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 ...
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73 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....
2
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1answer
63 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 ...
2
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1answer
172 views

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] ...
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17 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 ...
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3answers
111 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, ...
0
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1answer
51 views

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 ...
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2answers
139 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 ...
1
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2answers
75 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 ...
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202 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/...
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10 views

Scale spring-batch instances executed from within a web container

I am re-designing our current ETL for file ingestion where spring-batch containers will be deployed on Kubernetes. Each file type is processed by a different job, which will be triggered on demand via ...
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22 views

How to support alternative behaviour at the end of a pipeline when the new behaviour is decided at the beginning?

Let's assume we have a few loosely coupled components that form a pipeline. At the end is an file generating component. A new requirement comes in that requires an parallel alternative behaviour for ...
3
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3answers
113 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 ...
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114 views

Eureka cluster for service registry with only one IP address

I want to use the Eureka cluster with service discovery. As it said in the documentation, Eureka's nodes can share their state with other nodes. If one Eureka node fails, others still have all ...
1
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1answer
54 views

Where to handle duplicate key exceptions in multy layer application

+-------------+ +--------+ +----------+ | repository +-------->+service +------->+controller| +-------------+ +-^------+ +------------+ +-------------+ | ...
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1answer
2k 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 ...
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32 views

Spring JPA shared repositories - do I need an intermediary data access point?

I am developing multiple Spring Boot projects that share the same DB, and therefore Entity and Repository classes/interfaces. The Entities and Repositories are stored in a "common" library so that one ...
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2answers
303 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 ...
3
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2answers
238 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 ...
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2answers
98 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
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1answer
127 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....
2
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1answer
174 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 ...
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2k 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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27 views

Database design and Spring fetch type eager

I am working on an application Angular/Spring boot. This is the database shema (there were minor changes) In the backend part (Spring boot) we are using fetchtype eager, it means when i load mission ...
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1answer
2k 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 ...
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2answers
144 views

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. ...
3
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2answers
275 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 ...
2
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1answer
100 views

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 ...
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16 views

Organizing spring profile : specific case with unit test and multi module

This could be viewed as a follow-up of Organizing maven modules and spring profiles with a more specific case. I currently have an application with a GUI (mix of Swing for Cartography/JavaFX/Spring). ...
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33 views

Can reactive streams simplify API development even for low-scale applications?

The mainstream opinion about using a reactive non-blocking backend is that it increases performance for large numbers of clients but sacrifices maintainability due to increased complexity. I am in a ...
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1answer
39 views

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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2answers
100 views

How to design a process and use the business rules for sending alerts/notifications

Currently working on designing a process which demands me to send alerts like email notifications to the users which meet a business criteria(we can also call business rules). I want to make this ...
3
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1answer
288 views

Is this a good design for wrapping asynchronous API calls into a RESTful interface?

I'm working with an API that has many asynchronous calls and handlers. I'd like to extend these with a RESTful interface and endpoints in spring. I'm imagining the usual Controller and Service layers, ...
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0answers
17 views

Spring Security SAML and RSA session

This is probably a design/architectural question. My app uses RSA initiated SSO using SAML for authentication and from there on my app uses its own session to manage the request. There is a flaw in ...
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1answer
55 views

If you use Spring dependency injection does the unit test require some Spring stuff?

I completely understand, I think, how injecting a dependency of a class allows that dependency to be mocked and the class to be tested with the mocked version. What I am not sure about is if you use @...
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1answer
90 views

Should vanilla solutions be avoided in Spring web applications?

I am making a Java and Spring webapp that scrapes data from a web and then publishes it through an API. Some of the raw scrapped data is in the form of Set<SomeObject> which I then convert to a ...
1
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1answer
88 views

Best approach to handle user statuses and keep their history

I am developing a Spring application which has a few different modules. There will be a bunch of users added in the database. I want to add a feature, which will allow me to track users' availability,...
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1answer
120 views

What is the best practice to insert two similar records in sql server db table which will be sent to two different destinations?

I am working on parsing a file and inserting records into SQL Server DB.The database table structure will be something like this: A Users table which contains (id, name, address, destinationName,...
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71 views

oauth2 + angular - Most elegant way to pass the JWT auth token

I have an angular application, which is querying an API as a client (written on Spring Boot 2.2.1 + Spring 5.2.1) that supports 3rd party authentication over OAuth2. The API has altogether 3 different ...
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43 views

Is it a good practice to store session in two different places?

I have a use case like this and I am wondering if this solution is a good practice or not. Say I have a website called dashboard.com and this is only for US region. When users login here, I am ...
8
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3answers
3k views

“Depend on abstractions, not on concretions” what is the exact meaning of this term

I was reading SOLID principles on a website, in which for D - Dependency Inversion Principle it says: “Depend on abstractions, not on concretions” In other words. we should design our software in ...
3
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1answer
78 views

How would I approach collecting statistic across a method call chain?

Let's say I have an processing pipeline. It receives a file, converts the file to data, interprets the data, and then persists it. At every step of this way, I would need to collect statistics, so I ...
0
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1answer
204 views

How can we better maintain a large amount of DbUnit datasets?

The project I'm currently working on a Spring Boot project, and I have a question regarding testing against the database. Our testing tech is currently JUnit 4, Mockito and DbUnit, and we test ...
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3answers
160 views

What typical hardware improvements can be made to improve a Web app's performance?

We have a Single-Page (SPA) Ajax-based Java Spring/Hibernate app running in Tomcat 8.5. The app's performance is acceptable, but not lightning-fast. A typical Insert Record takes 3-4 sec., e.g. 05 ...
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1answer
1k views

What do you think about DTOs in Spring Data JPA project?

First of all, I am not a junior programmer. I'm just looking for best-practice. How do you use entities and DTOs into your Spring Data JPA projects? Assume there is our layers: Repositories (as ...
2
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1answer
156 views

Better practice of workaround for implementing a type field in Java

We have a class in our company's main library as follows: public class User { private long id; private UserType type; // Getters, setters, constructors, etc. } and have several options ...
4
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2answers
194 views

How to write dynamic (non ORM) repositories that can return only the necessary data without creating many methods or data-objecs?

We're currently developing a Spring application that uses jdbcTemplates for the repository. We have a lot of functions that only require specific combinations of columns in our database. It would be ...
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1answer
959 views

In a Spring Boot Project, would you use interfaces for entities or not?

I am currently on the decision, whether to use interfaces throughout my whole spring project or not. I scouted some open source projects and saw, that many big projects are handling that quite ...

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