How do Maven or Gradle resolve dependencies in a Spring Boot project?

Explains dependency graphs, transitive versions, scopes or configurations, Spring Boot's BOM, and reproducible builds.

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TL;DR

Maven and Gradle start from direct dependencies, follow their transitive dependencies, and build classpaths for different purposes such as compilation, testing, and runtime. When the graph requests multiple versions of the same library, the build tool applies its resolution rules to select one. Spring Boot reduces accidental combinations by publishing a tested bill of materials, so supported dependency versions can be managed together. A starter adds a useful dependency set; it does not mean every version in the graph is invisible or automatically correct.

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A working model of Java dependency resolution and the ability to diagnose or control the runtime classpath deliberately.

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Overview
A Java build resolves a dependency graph, not a flat list, and the selected runtime versions may differ from the versions a developer notices first.
Maven and Gradle start from direct dependencies, follow their transitive dependencies, and build classpaths for different purposes such as compilation, testing, and runtime. When the graph requests multiple versions of the same library, the build tool applies its resolution rules to select one. Spring Boot reduces accidental combinations by publishing a tested bill of materials, so supported dependency versions can be managed together. A starter adds a useful dependency set; it does not mean every version in the graph is invisible or automatically correct.
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Maven commonly mediates a conflict by the nearest definition, with dependency management able to control selected versions. Gradle considers all requested versions and normally selects the highest version in a standard version conflict, while constraints or platforms can guide that choice. I inspect the actual graph with or Gradle's and tasks. Before adding an exclusion or override, I identify who introduced the dependency and whether the selected version is binary-compatible.

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Details

Treating the dependency file as the complete resolved classpath.
Assuming Maven and Gradle resolve every version conflict the same way.
Adding exclusions until the build passes without inspecting the graph.
Overriding Spring-managed versions without compatibility testing.

How do Maven or Gradle resolve dependencies in a Spring Boot project?

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