IntelliJ not loading transitive dependency in maven project

Question

I've made a small library, lets call it lib. It dependends on another library, sublib which is available in Maven central:

lib/pom.xml:

<dependencies>
    <dependency>
        <groupId>3rdparty</groupId>
        <artifactId>sublib</artifactId>
        <version>x</version>
    </dependency>
</dependencies>

Now I'm trying to use lib in my project proj. I've set it as a dependency:

proj/pom.xml:

<dependencies>
    <dependency>
        <groupId>mynamespace</groupId>
        <artifactId>lib</artifactId>
        <version>y</version>
    </dependency>
</dependencies>

When I run mvn exec:java -D exec.mainClass=mynamespace.proj.Main the program runs fine. However if I run it from IntelliJ, I get the following error:

java.lang.NoClassDefFoundError: 3rdparty/SomeSubLibClass
    at mynamespace.SomeLibClass.method(SomeLibClass.java:100)

This seems to indicate that IntelliJ does not load the transitive sublib dependency. How can I fix this?

Answer 1

You can manually right click on the pom.xml file in the file tree and select maven > reimport.

Sometimes you'll see a popup saying "Maven projects need to be imported"; you should select Enable Auto-Import.

This option can be found in Preferences > Maven > Importing > [x] Import Maven projects automatically (and is unchecked by default):