A modern programming language that makes developers happier.

kotlinlang

*Issue:*
Gradle application plugin using Kotlin is not compiling Java files.

*Steps:*
*1. Create gradle application*

gradle init
Select type of project to generate:
  1: basic
  2: application
  3: library
  4: Gradle plugin
Enter selection (default: basic) [1..4] 2

Select implementation language:
  1: C++
  2: Groovy
  3: Java
  4: Kotlin
  5: Swift
Enter selection (default: Java) [1..5] 4

Select build script DSL:
  1: Groovy
  2: Kotlin
Enter selection (default: Kotlin) [1..2] 2

*2. Add SomeJavaClass.java file beside App.kt file*
class SomeJavaClass{
    public void m(){
        System.out.println("x");
    }
}

*3. Try to access SomeJavaClass in App.kt main method*
    SomeJavaClass().m()

*Excepted Output:*
Should be able to run

*Actual Output:*
no compile issues but crash because of NoClassDefFoundError

<@UU2UMD71A> Hello, default folder for Java classes is `src/main/java` folder.

There are two possible solutions:

• relocate Java sources to  `src/main/java` folder
• modify java sources location by adding following lines into `build.gradle.kts`
```sourceSets.main {
    java.srcDirs("src/main/kotlin")
}```


Thanks, that's the issue. I forgot about the java folder. BTW, It should show compile time error, isn't it ? I have used the below in my Groovy build.gradle
```sourceSets {
    main.kotlin.srcDirs = ['src/main/java', 'src/main/kotlin']
}```

instead of all this, just renaming kotlin folder present inside src to "java" is the simplest solution. :grin: