Tagged articles

@Primary

5 articles · Page 1 of 1

Jul 10, 2026 · Backend Development

Debugging Spring Boot Auto‑Configuration Failures: Manual Bean Override and Exclusion

Spring Boot’s auto‑configuration can become a bug hotspot; this article explains why overrides sometimes succeed, why they fail, the role of conditional annotations, and provides step‑by‑step strategies—including manual @Bean overrides, @Primary, and exclude mechanisms—to reliably diagnose and fix auto‑configuration issues.

@ConditionalOnMissingBean@PrimaryBean

0 likes · 15 min read

Debugging Spring Boot Auto‑Configuration Failures: Manual Bean Override and Exclusion

Senior Xiao Ying

Mar 6, 2026 · Backend Development

5 Ways to Inject Spring Boot Implementations (Qualifier, Collections, Profile)

When a Spring Boot interface has several implementations, injecting the correct bean can cause NoUniqueBeanDefinitionException; this article explains five injection techniques—@Qualifier with constructor injection, @Primary, @Resource, collection or Map injection, and @Profile-based environment isolation—showing code examples, usage rules, and best‑practice recommendations.

@Primary@Profile@Qualifier

0 likes · 7 min read

Java One

Dec 7, 2025 · Backend Development

Resolving Multiple Bean Implementations in Spring Boot with @Qualifier and @Primary

This tutorial explains why Spring Boot fails when several beans implement the same interface, and demonstrates how to use @Qualifier to select a specific bean or @Primary to set a default, including code examples, error messages, and best‑practice recommendations.

@Primary@Qualifierbackend-development

0 likes · 7 min read

Resolving Multiple Bean Implementations in Spring Boot with @Qualifier and @Primary

Spring Full-Stack Practical Cases

Oct 12, 2024 · Backend Development

Mastering Spring Boot Bean Selection: 6 Ways to Choose the Right Implementation

This tutorial walks through six practical techniques—@Qualifier, @Primary, @Profile, collection injection, @Priority, and custom @Conditional—to control which implementation of a Spring Boot interface is autowired, complete with code examples and usage tips.

@Primary@Profile@Qualifier

0 likes · 8 min read

Mastering Spring Boot Bean Selection: 6 Ways to Choose the Right Implementation

Spring Full-Stack Practical Cases

Mar 1, 2024 · Backend Development

How to Precisely Choose a DAO Implementation in Spring: 8 Injection Techniques

This article explains eight practical ways to control which DAO implementation Spring injects, covering @Qualifier, bean naming, custom qualifiers, manual lookup, profile‑based beans, @Primary, and @Priority, with complete code examples for each method.

@Primary@Profile@Qualifier

0 likes · 7 min read

How to Precisely Choose a DAO Implementation in Spring: 8 Injection Techniques