next try

build.gradle

@@ -59,7 +59,7 @@ task JssSourceJar(type: Jar) {
 }
 
 artifacts {
-    jss JssSourceJar
+    archives JssSourceJar
 }
 
 File genSrc = file("src/gen/java")
@@ -234,7 +234,7 @@ publishing {
         maven(MavenPublication) {
             artifactId = 'preprocessor'
             from components.java
-            artifact jss
+            artifact JssSourceJar
         }
     }
     repositories {