How to remove transitive dependency from pom

Question

Problem with Child module is that it inherent the dependency from parent pom. However parent pom marked that dependency with option tag.

This is the parent pom:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>org.parent</groupId>
<artifactId>Parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>

<name>Parent</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <scope>compile</scope>
        <optional>true</optional>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

<modules>
    <module>Child</module>
</modules>
</project>

This is Child pom:

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.parent</groupId>
    <artifactId>Parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>org.child</groupId>
<artifactId>Child</artifactId>
</project>

Problem is when I starts child module, I can see tomcat initialization. I dont want to load tomcat for child module. How do I restrict tomcat dependency in child module? Do I need to define additional configuration to exclude it ? I already tried with exclusion tag but it didn't work.

I think you should not put dependencies into the parent pom if not all child projects use them. I do not whether it is possible at all to exclude such a dependency in a child module. — J Fabian Meier, Sep 21 '18 at 12:08

score 0 · Answer 1 · answered Sep 21 '18 at 11:56

0

As you already mentioned you'll have to exclude those transitive Tomcat dependencies. Here's an example for doing so - not in a child module though but it should be similar:

How to exclude embeded Tomcat in Spring Boot application

answered Sep 21 '18 at 11:56

Tommy Brettschneider

1,480
9
18

score 0 · Accepted Answer · answered Jan 24 '19 at 11:09

This is not actually solution to this concern. However I got something that can do this trick to stop initializing tomcat for child modules. All that need is to disable it through

spring.main.web-application-type=none

More details can be found on this thread Spring boot enable/disable embedded tomcat with profile

How to remove transitive dependency from pom

2 Answers2