I have a maven project that contains two subprojects, one contains Clojure source, and the second contains Java source.

This is the top level POM file:

<?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.example</groupId>
    <artifactId>maven-clojure-test-2</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <modules>
        <module>clojure</module>
        <module>java</module>
    </modules>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

</project>

The Clojure project is set up to compile using clojure-maven-plugin, with the following POM file:

<?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>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>maven-clojure-test-2</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>clojure</artifactId>
    <packaging>clojure</packaging>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>


    <build>
        <plugins>
            <plugin>
                <groupId>com.theoryinpractise</groupId>
                <artifactId>clojure-maven-plugin</artifactId>
                <version>1.8.3</version>
                <extensions>true</extensions>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.clojure</groupId>
            <artifactId>clojure</artifactId>
            <version>1.11.2</version>
        </dependency>
    </dependencies>
</project>

This project contains a single clojure source file, shown here:

(ns clojuretest.test
    (:gen-class
        :methods
        [[hello [] void]]))

(defn -hello [this] (println "running in clojure"))

The Java project is using IntelliJ’s default settings, except that it has a dependency to the clojure project:

<?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>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>maven-clojure-test-2</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>java</artifactId>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>clojure</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>
</project>

This project also has a single source file:

package javatest;

public class Main
{
    public static void main(String[] args) {
        System.out.println ("Java");
        new clojuretest.test().hello();
    }
}

When I compile this with Maven, everything works fine. The Java main function is able to be run, and the expected output is produced:

Java
running in clojure

However, the IntelliJ’s java editor highlights new clojuretest.test().hello() as an error, and says that clojuretest is undefined. I presume it’s searching for Java source files, not looking at the compiled .class files, to identify what is and is not a valid dependency.

How do I get it to recognize the classes built in a local dependency that aren’t implemented in Java?

Things I’ve tried:

• Enabling the “Delegate IDE build/run actions to Maven” checkbox
• Invalidating caches
• Adding the generated jar file in the clojure module as a library to the java module (by using right click -> add as library); this works, but isn’t ideal because I will need to remove it and add it back in every time I increase the module’s version number.

Really, I just need to find a way of telling IDEA to just use the contents of the module’s jar file rather than trying to find source files in it.

Any ideas?