Maven dependency pickup in springboot

user_1171533 0
Viewed 1019

I have declared these two dependencies 

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-tomcat</artifactId>   
     <scope>provided</scope> 
</dependency>

and :

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

spring-boot-starter-web already has spring-boot-starter-tomcat with embedded tomcat-core. As shown here https://stackoverflow.com/a/33419889/1171533

My question is when my project is build and run which of the implementations of spring-boot-starter-tomcat is chosen to run? And how can I find which one is being used?

spring-boot maven java
3 Answers

Run mvn dependency:tree.

Look for this line:

...
[INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:<version>:provided
...

If you delete

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-tomcat</artifactId>   
     <scope>provided</scope> 
</dependency>

the previous output line should be gone and this gets added instead:

...
[INFO] \- org.springframework.boot:spring-boot-starter-web:jar:<version>:compile
[INFO]    +- org.springframework.boot:spring-boot-starter:jar:<version>:compile
...
user_63672130

Based on a class instance, you can find various information of the jar that contains that class.

yourInstance.getClass().getPackage().getImplementationVersion()
user_41295510

If you are using @RestController(means creating restful services) below dependency you can use

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

if you are using theamleaf , jsp (you want to deploy application as war) you need to include following dependency

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>
user_108257460
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