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Spring Bootframework~10 mins

Multi-module project structure in Spring Boot - Step-by-Step Execution

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Concept Flow - Multi-module project structure
Parent Project (pom.xml)
Build Parent -> Build Modules
Modules share dependencies & build
Run individual modules or combined app
The parent project manages common settings and dependencies. Each module has its own code and can be built separately or together.
Execution Sample
Spring Boot
<modules>
  <module>module-a</module>
  <module>module-b</module>
</modules>
This snippet shows the parent pom.xml listing two modules, telling Maven to build them together.
Execution Table
StepActionFile/ModuleResult
1Read parent pom.xmlparent-pom.xmlIdentify modules: module-a, module-b
2Build module-amodule-a/pom.xmlCompile module-a code, resolve dependencies
3Build module-bmodule-b/pom.xmlCompile module-b code, resolve dependencies
4Link modulesparent-pom.xmlModules share common dependencies and build settings
5Run module-amodule-aStart module-a application or tests
6Run module-bmodule-bStart module-b application or tests
7Build parentparent-pom.xmlBuild all modules together
8Exit-Build and run complete
💡 All modules built and linked successfully, ready to run individually or combined
Variable Tracker
VariableStartAfter Step 1After Step 2After Step 3Final
modulesempty[module-a, module-b][module-a, module-b][module-a, module-b][module-a, module-b]
module-a build statusnot builtnot builtbuiltbuiltbuilt
module-b build statusnot builtnot builtnot builtbuiltbuilt
parent build statusnot builtnot builtnot builtnot builtbuilt
Key Moments - 3 Insights
Why do we need a parent pom.xml in a multi-module project?
The parent pom.xml centralizes common dependencies and build settings so modules don't repeat them. See Step 1 and Step 4 in the execution_table.
Can modules be built and run independently?
Yes, each module has its own pom.xml and can be built or run separately, as shown in Steps 2, 3, 5, and 6.
How does building the parent project affect modules?
Building the parent triggers building all modules together, ensuring consistent versions and dependencies, as in Step 7.
Visual Quiz - 3 Questions
Test your understanding
Look at the execution table, what modules does the parent pom.xml list?
Amodule-a and module-b
BOnly module-a
COnly module-b
DNo modules listed
💡 Hint
Check Step 1 in the execution_table where parent pom.xml identifies modules
At which step is module-b built?
AStep 2
BStep 3
CStep 5
DStep 7
💡 Hint
Look at the Action and File/Module columns in the execution_table
If the parent pom.xml did not list module-b, what would change in the execution table?
AStep 7 would build only module-b
BStep 2 would be missing
CStep 3 would be missing
DNo change
💡 Hint
Modules are identified in Step 1 and built in Steps 2 and 3
Concept Snapshot
Multi-module project uses a parent pom.xml to manage common settings.
Modules have their own pom.xml files and code.
Parent pom lists modules to build together.
Modules can be built/run independently or combined.
This structure keeps code organized and dependencies consistent.
Full Transcript
A multi-module project in Spring Boot uses a parent pom.xml file that lists all modules. Each module has its own pom.xml and code. When building, Maven reads the parent pom.xml to find modules, then builds each module in order. Modules share dependencies and build settings from the parent. You can run modules separately or build the whole project together. This helps keep code organized and avoids repeating dependency info.