Intellij - maven模块依赖。 NoClassDefFound错误

Question

I created a maven base project and it has two modules, A and B . In A i added B as a dependency and also added JSoup from maven in B via Project Structure .

Now i want to run these following codes A:

public class A {
    public static void main(String args[]){
        new B().foo();
    }
}

B:

public class B {
    public void foo() {
        System.out.println("B....");//prints B...
        new Document("S");// NoClassDefFoundError exception
    }
}

When i run the following code it says:

Exception in thread "main" java.lang.NoClassDefFoundError: org/jsoup/nodes/Document

Jsoup only added into B.iml not B.pom file:

<orderEntry type="library" exported="" name="org.jsoup:jsoup:1.8.3" level="project" />

I can solve this problem by adding jsoup dependency to A but i think it's not a good idea.

Is there any way that A recognizes all B 's dependencies?

Root 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>xxx</groupId>
    <artifactId>xxx</artifactId>
    <packaging>pom</packaging>
    <version>0.5-SNAPSHOT</version>
    <modules>
        <module>A</module>
        <module>B</module>
    </modules>


</project>

A's 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">
    <parent>
        <artifactId>xxx</artifactId>
        <groupId>xxx</groupId>
        <version>0.5-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>A</artifactId>


</project>

B's 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">
    <parent>
        <artifactId>xxx</artifactId>
        <groupId>xxx</groupId>
        <version>0.5-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>B</artifactId>


</project>

Answer 1

In A i added B as a dependency

So needs to add this dependency to A 's pom file too

 <dependencies>
        <dependency>
            <groupId>xxx</groupId>
            <artifactId>B</artifactId>
            <version>0.5-SNAPSHOT</version>
        </dependency>

    </dependencies>

and also added JSoup from maven in B

Also you should add this dependency to B 's pom file

 <dependencies>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.8.3</version>
        </dependency>
    </dependencies>

via Project Structure

IntelliJ and Maven dependecy management don't related to each other.

Answer 2

You did not add B as a dependency to A. In order to do that you must add A's pom.xml this lines.

<dependencies>
    <dependency>
        <groupId>xxx</groupId>
        <artifactId>B</artifactId>
        <version>0.5-SNAPSHOT</version>
     </dependency>
</dependencies>

Also jsoup is not defined as a dependency in any projects. You should read more about maven and its dependency management .