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kotlinlang

In the case of a maven project with Kotlin and Java side by side, the Kotlin docu (<https://kotlinlang.org/docs/maven.html#compile-kotlin-and-java-sources>) suggests this configuration
```&lt;configuration&gt;
    &lt;sourceDirs&gt;
        &lt;sourceDir&gt;${project.basedir}/src/main/kotlin&lt;/sourceDir&gt;
        &lt;sourceDir&gt;${project.basedir}/src/main/java&lt;/sourceDir&gt;
    &lt;/sourceDirs&gt;
&lt;/configuration&gt;```
but what do I do if I have a multi-module project? `${project.basedir}/src/main/kotlin` lacks the module in it's path, doesn't it?

I'm no Maven expert (not at all, ever), but afair `project.basedir` should be the base dir of the according module.

makes sense, but in that case I don't understand why the java-class can't find the Kotlin class
```[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (java-compile) on project erezept-lib: Compilation failure
[ERROR] /home/stephan/workspace/erp-modul/erezept-lib/src/main/java/de/gematik/titus/erezept/service/PreconditionService.java:[319,27] error: cannot find symbol
[ERROR]   symbol:   variable JwtUtil
[ERROR]   location: class PreconditionService```
`JwtUtil`  is in the same package as `PreconditionService` but in the Kotlin src-root. IntelliJ likes it, but `mvn compile` leads to the error msg. I made sure to have the kotlin-maven-plugin right in front of the maven-compiler-plugin.

Maybe this helps: <https://www.baeldung.com/kotlin/maven-java-project>
Order is not enough

I've also disabled default compile and testCompile on the maven-compiler-plugin. I've done all there is in the baldung example :confused:
Maybe it's one of the other plugins maven-source-plugin, spring-boot-maven-plugin,  jacoco-maven-plugin, sonar-maven-plugin, maven-surefire-plugin, maven-failsafe-plugin, maven-checkstyle-plugin, versions-maven-plugin that need to be configured to consider kotlin as well!?? :grimacing:

¯\_(ツ)_/¯
Sorry, not touching Maven with a five-foot-pole if I can avoid it any way.

<@UHU68M354> every module has a POM inside, hasn't it ? Multi-module is only the parent which does not have any source, correct ?

<@UHU68M354> well, it means every module has its own `sourceDirs`
What is the issue ?

The issues / questions were:
1. does `project.basedir` include the module directory or is it the directory of the parent project
2. why do his Java classes not find the Kotlin classes of the same module

<@U8R2441TN> the issue is that after the setup the compilation fails:
```[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (java-compile) on project erezept-lib: Compilation failure
[ERROR] /home/stephan/workspace/erp-modul/erezept-lib/src/main/java/de/gematik/titus/erezept/service/PreconditionService.java:[319,27] error: cannot find symbol
[ERROR]   symbol:   variable JwtUtil
[ERROR]   location: class PreconditionService```
`PreconditionService`  is still a Java-class. `JwtUtil` was refactored to Kotlin, and since my config should be ok (but apparently it isn't), it shouldn't be an unfindable symbol during compilation.
When I Strg+click on "JwtUtil" with the the IntelliJ editor window showing the source of `PreconditionSerice` , IntelliJ it jumps to the Kotlin file, no problem.