Cannot find maven dependencies when importing from another module

Question

I have a maven project with multiple submodules.

I have a root pom file in which I have the jackson dependency

<dependency>
 <groupId>fasterxml.jackson.core</groupId>
 <artifactId>jackson-databind</artifactId>
 <version>${jackson.version}</version>
</dependency>

I have the jackson dependency in one module called 'api'.

<dependency>
 <groupId>fasterxml.jackson.core</groupId>
 <artifactId>jackson-databind</artifactId>
 <scope>provided</scope>
</dependency>

I have a new module named 'client' in which I import the maven dependency of 'api'

<dependency>
 <groupId>abc.com</group>
 <artifactId>api</artifactId> 
 <version>0.1.0-SNAPSHOT</version>
 <scope>provided</scope>
</dependency>

I am using the following command to compile.

mvn -Djackson.version=2.4.4 compile

I am getting a compile error if I try to import jackson libraries to the client module unless I add the jackson dependency explicitly again to the client module

Why is adding the api dependency not sufficient as it already contains the jackson dependency

Jiri Tousek · Accepted Answer · 2016-06-06 07:31:13Z

2

You define the jackson dependency in api as provided, so it is not transitive:

provided
This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime. For example, when building a web application for the Java Enterprise Edition, you would set the dependency on the Servlet API and related Java EE APIs to scope provided because the web container provides those classes. This scope is only available on the compilation and test classpath, and is not transitive.

- https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope (emphasis added)

answered Jun 6, 2016 at 7:31

Jiri Tousek

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3 Comments

user3451476 Over a year ago

sorry. I have updated the question. I'm passing the version when I try to compile

Jiri Tousek Over a year ago

It's not the version missing, it's that the api's dependency on jackson is declared as <scope>provided</scope>. Where are you using the root pom? Only api or client as well?

user3451476 Over a year ago

I am using the root pom for both api and client. And passing the jackson.version when i compile. Isn't tat sufficient ?

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