Add Automatic-Module-Name entry to jar manifest for interoperability …

…with Project Jigsaw / Java 9 modules

CHANGELOG

@@ -1,3 +1,6 @@
+	-- Add "Automatic-Module-Name" entry to jar manifest for interoperability with Project Jigsaw / Java 9 modules
+	   See https://github.com/swaldman/c3p0/issues/171
+	   Thanks Jörg Hohwiller
 	-- Try context ClassLoader if library ClassLoader fails to load a named, necessary driver class.
 	   See https://github.com/swaldman/c3p0/pull/115
 	   Thanks Rodrigo Merino!

build.sc

@@ -1,7 +1,7 @@
 import $meta._
 
 import mill._
-import mill.api.Result
+import mill.api.{JarManifest,Result}
 import mill.scalalib._
 import mill.scalalib.publish._
 import mill.util.Jvm
@@ -147,6 +147,11 @@ object c3p0 extends RootModule with JavaModule with PublishModule {
   // but old JVMs that hit it wil generate NoSuchMethodError or similar at runtime
   override def javacOptions = Seq("-source",JvmCompatVersion,"-target",JvmCompatVersion)
 
+  override def manifest = T {
+    val mainTups = JarManifest.MillDefault.main + Tuple2("Automatic-Module-Name","com.mchange.v2.c3p0")
+    JarManifest( main = mainTups )
+  }
+
   object test extends JavaModule with TestModule.Junit5 {
     override def moduleDeps = Seq(c3p0)