Questions tagged [java]
Java is a high-level, platform-independent, object-oriented programming language originally developed by Sun Microsystems. Java is currently owned by Oracle, which purchased Sun in 2010.
5,020 questions
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Is it good practice to return ApiResponse from a Spring service layer?
I'm working on a Spring Boot application with a VoucherService and VoucherController. I currently have the service method return an ApiResponse<T> directly, like this:
@Transactional
public ...
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1
answer
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What is the difference between Vertical Slice Architecture and Feature-Based Architecture
I am refactoring my monolithic application, in which the code is organized based on layered architecture.
I want to implement Modulith (Modular Monolit) in my app, but I've run into a problem: I haven'...
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Convenience inheritance
Sometimes, you inherit from a class that defines the semantics of your type (Shape – Ellipse – Circle). Other times, you inherit simply because it's convenient to do so.
A superclass may have ...
- 2,030
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Keeping the impact of changes low when moving shared domain objects into a library
I’m refactoring a microservice project where multiple services share the same domain objects. Over time, these objects have diverged across services, causing inconsistencies.
To solve this, I plan to ...
- 111
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Tracking data change in GUI form
Problem: our application allows users to close a form window after certain changes without any confirmation, instead of pressing the Save button. This makes them complain they have to start afresh.
We ...
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How to create a job management for a hybrid cloud/on-premise software?
I am exploring the state-of-the-art methods to create a service that can run and scale in both cloud (container) and on-premise environments.
The current version of the software is designed for on-...
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Search requests with multiple search values
(related: Fetching records matching multiple joined attributes)
If Spring Data doesn't allow GET requests to have a body (and it's considered bad practice anyway)
curl -X 'GET' \
'http://localhost:...
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Code reusability/inheritance introduces pointless testing
Say I have a bunch of classes that imitate cars: SportsCar, Truck, and SUV. All of these classes share some public methods like start() and stop() which they inherit from an abstract class Car. While ...
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Domain data classes with fluid property lists
Is it fine for your data models to have a sort of "open-ended" list of properties?
For example, you may have some Employee:
// getters, setters, annotations are omitted
public class Employee ...
- 2,030
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Why should I never ever ever use Java serialization?
I've heard that I should never use Java serialization (Serializable/ObjectInputStream/ObjectOutputStream) because of security. What's the problem?
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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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Must getters return values as is?
We have entities with numeric properties, they are of boxed types (e.g. Integer). Typically, each of those properties has a pair of getters: getInt(), which returns zero on null values, and ...
- 2,030
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Ensuring type safety, honoring supertype contract
Due to type erasure, I can't do instanceof T in Java. With that in mind, how do (should) I write, for example, a generic TreeNode (or, more precisely, DefaultMutableTreeNode)? setUserObject() accepts ...
- 2,030
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364
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Which is better: a chain of OR statements or IF in a loop? (Java)
Which code style is preferred in Java?
final boolean result = isCausedBy(e, ExceptionType1.class)
|| isCausedBy(e, ExceptionType2.class)
|| isCausedBy(e, ExceptionType3.class)
|...
- 103
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Deciding on granularity of SOLID's SRP
I am currently working in a project where we are utilizing kafka as a Message Queue. We have two use cases here, one is to consume the messages in parallel, no ordering of any kind required. And one ...
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Avoiding instanceofs with GUI composites
I have a stack of custom Row widgets. Each of them is a label with some editComponent (often a JTextComponent). Rows are aware of their previous and next siblings (if a Row has no such sibling, the ...
- 2,030
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Is Spring Boot Unit Test Coverage with Integration tests only a bad practice?
I have recently come across a few codebases at work where the previous developers chose to reach the >80% coverage criteria by writing only integration tests with the @SpringBootTest annotation ...
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Versioning for a set of plugin libraries that supports foundational concepts within various toolsets
I have a foundational metamodel which I have implemented using Java interfaces which I can easily version using major.minor.bugfix.
I also have plugins that utilize these libraries to implement these ...
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2
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How to minimize the issues when SQL PreparedStatement is not an option
The application in question is integrating with BigImportantThing (BIT). Part of our application's job is to provide a better interface, so this is something to resolve within our application. The ...
- 109
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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 ...
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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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The best way to handle exceptions?
I have the following method, which needs to return a List, but exceptions might occur along the way, and I don't want to handle them in my application, mainly because I don't even know how to handle ...
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checkNotNull vs. JEP 358: Helpful NullPointerExceptions: Should we remove existing null checks?
With the introduction of JEP 358 in Java 14, which provides more informative NullPointerException (NPE) messages, is it advisable to remove existing explicit null checks in cases where the null-check ...
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Vanilla interface implementations. What should I call it? [closed]
Some may think I'm kidding, but I'm really stuck on this
Suppose you have some UserDao interface that you want to implement
What should you call it?
Here are a few points I'd like to make
I firmly ...
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DDD: How to update a domain model with a lot of fields
Let's say there is a domain model:
@Table(name = "room")
@Getter
@FieldNameConstants
@AllArgsConstructor(onConstructor = @__({@PersistenceCreator}))
public class HotelRoom extends ...
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