Is it possible to use Kotlin package functions and package properties in different sourcesets? When I try to do so, I have NoSuchMethodError thrown.
Example
I have Gradle project with Kotlin code and two sourcesets in it, main and test.
In main, I have the following code in one of the files:
package ru.ifmo.ctddev.igushkin.dkvs
...
public val payloadSplitter: String = " ### "
In test I try to access payloadSplitter with the following code:
package ru.ifmo.ctddev.igushkin.dkvs
...
public class MessageTests {
...
test fun testParsing() {
...
checkParseAndToString("p1b 345 ${payloadSplitter} set a b c")
}
...
}
And exactly in the first line where payloadSplitter is accessed, at runtime I get
java.lang.NoSuchMethodError: ru.ifmo.ctddev.igushkin.dkvs.DkvsPackage.getPayloadSplitter()Ljava/lang/String;
Other global variables and functions are also inaccessible in test with the same error.
UPD Kotlin team explained the issue and announced the fix here.
For properties and methods outside of classes, Kotlin creates a java class named ${packagename}Package with the properties and methods implemented as static methods and variables. With multiple source-sets, the java class will be created twice, once for each source-set. Your issue is that the test source-set "package class" is hiding the class compiled in the main source-set.
As mentioned in the comments above, avoid having any top-level properties or methods in the test source-set to prevent the Kotlin compiler from creating this package class in the test output directory.