Questions tagged [spring]

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

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I Need to Mock a Database in Springboot, with Tables, Schemas, and Stored Procedures [closed]

I have a Spring application that interfaces with a database (specifically, a MariaDB database). In the database are several schemas, with a handful of tables and stored procedures in each. In the ...
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0answers
35 views

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 ...
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1answer
63 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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3answers
143 views

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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0answers
19 views

How to draw internal patterns used by the Spring boot framework in UML class diagrams?

I am currently in university and doing some practical work as a module. The professor demands that we work with the waterfall model and we are currently in the design phase. The requirements for the ...
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2answers
64 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 ...
0
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1answer
25 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 @...
1
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1answer
201 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 ...
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2answers
111 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 ...
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0answers
34 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 ...
0
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1answer
71 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 ...
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1answer
51 views

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 ...
2
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4answers
295 views

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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2answers
84 views

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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1answer
97 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 ...
0
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1answer
167 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 ...
0
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0answers
47 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 ...
2
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0answers
120 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
71 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
728 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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0answers
33 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
197 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
58 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
201 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
112 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 ...
1
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0answers
334 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/...
2
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3answers
161 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 ...
1
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1answer
85 views

Where to handle duplicate key exceptions in multy layer application

+-------------+ +--------+ +----------+ | repository +-------->+service +------->+controller| +-------------+ +-^------+ +------------+ +-------------+ | ...
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1answer
4k 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 ...
0
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2answers
760 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 ...
4
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2answers
342 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 ...
1
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2answers
101 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
1answer
188 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
279 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 ...
0
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0answers
3k 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 ...
0
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1answer
3k 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
146 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
390 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
103 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 ...
0
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1answer
46 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 ...
0
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2answers
131 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
361 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, ...
1
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0answers
18 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 ...
-1
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1answer
56 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
vote
1answer
132 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,...
-1
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1answer
121 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,...
0
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0answers
82 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 ...
0
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0answers
47 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 ...
11
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3answers
4k 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 ...

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