finally it seems to work

server/build.gradle

@@ -44,3 +44,11 @@ dependencies {
 tasks.named('test') {
     useJUnitPlatform()
 }
+
+jar {
+    manifest {
+        attributes(
+                'Main-Class': 'com.usatiuk.tjv.y.server.ServerApplication'
+        )
+    }
+}