Finally, I've found that was a Maven issue with the clojure plugin.
I've added this configuration to the pom.xml, and then it worked.
<plugin>
<groupId>com.theoryinpractise</groupId>
<artifactId>clojure-maven-plugin</artifactId>
<version>1.3.13</version>
<extensions>true</extensions>
<configuration>
<sourceDirectories>
<sourceDirectory>src/main/clojure</sourceDirectory>
</sourceDirectories>
<testSourceDirectories>
<sourceDirectory>src/test/clojure</sourceDirectory>
</testSourceDirectories>
</configuration>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test</id>
<phase>verify</phase>
<goals>
<goal>test</goal>
</goals>
</execution>
</executions>
</plugin>