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In a project with two applications, a Tair bean defined via JavaConfig works in one app but fails in the other because Spring’s injection rules prioritize type over name, causing ambiguity; using explicit bean naming with XML, adding @Qualifier, or switching to @Resource resolves the issue.
This article provides a systematic summary of Spring's core concepts—including IoC, AOP, bean configuration via XML and annotations, dependency injection mechanisms, transaction management, and web integration—offering Java developers a clear guide to effectively using the framework in real-world projects.
This article explains the fundamentals of dependency and dependency injection in Spring, compares class relationships such as inheritance, association, aggregation, and composition, and demonstrates constructor, static‑factory, instance‑factory, setter, constant, and ID reference injection with detailed XML configurations and Java code examples.