Running Clojure with Maven etc

main.clj

(ns my-project.core
  (:require [clojure.spec.alpha :as s]))

;; Define a simple spec for a 'User' map
(s/def ::name string?)
(s/def ::age int?)
(s/def ::user (s/keys :req [::name ::age]))

(defn -main [& args]
  (let [valid-data {::name "Greg" ::age 30}
        invalid-data {::name "Greg" ::age "thirty"}]
    
    (println "Checking valid data:" (s/valid? ::user valid-data))
    (println "Checking invalid data:" (s/valid? ::user invalid-data))
    
    (if (s/valid? ::user valid-data)
      (println "Success! Spec is working.")
      (println "Failure! Spec validation failed."))))

pom.xml

<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
           https://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>myproject</groupId>
  <artifactId>cloj1</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
    <dependency>
      <groupId>org.clojure</groupId>
      <artifactId>clojure</artifactId>
      <version>1.12.0</version>
    </dependency>
    <dependency>
      <groupId>org.clojure</groupId>
      <artifactId>spec.alpha</artifactId>
      <version>0.6.249</version>
    </dependency>
    <!-- Source: https://mvnrepository.com/artifact/org.clojure/core.specs.alpha -->
    <dependency>
      <groupId>org.clojure</groupId>
      <artifactId>core.specs.alpha</artifactId>
      <version>0.5.81</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <build>
    <sourceDirectory>bin/main/</sourceDirectory>
    <resources>
        <resource>
            <directory>bin/main</directory>
            <includes>
                <include>**/*.clj</include>
                <include>**/*.cljc</include>
                <include>**/*.edn</include>
            </includes>
        </resource>
    </resources>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>3.1.0</version>

        <executions>
          <execution>
            <goals>
              <goal>java</goal>
            </goals>
          </execution>
        </executions>

        <configuration>
          <mainClass>clojure.main</mainClass>
          <arguments>
            <argument>-m</argument>
            <argument>my-project.core</argument>
          </arguments>
        </configuration>

      </plugin>
    </plugins>
  </build>

</project>

project.md

The following commands work
mvn clean compile
java -cp "bin/main:lib/clojure-1.12.0.jar:lib/spec.alpha-0.6.249.jar:lib/core.specs.alpha-0.5.81.jar" clojure.main -m my-project.core
and
mvn exec:java -Dexec.mainClass="clojure.main" -Dexec.args="-m my-project.core"
and
mvn exec:java

Project folders -
bin/main/my_project
src/main/clojure/my_project
target/classes/my_project

jars -
lib/clojure-1.12.0.jar
lib/core.specs.alpha-0.5.81.jar
lib/spec.alpha-0.6.249.jar