Java-ize echo module

build.sbt

@@ -235,7 +235,7 @@ lazy val okhttp = project
   )
 
 lazy val echo = project
-  .settings(shared)
+  .settings(pureJava)
 
 lazy val jvm = project
   .dummy

echo/src/main/java/coursier/echo/Echo.java

@@ -0,0 +1,22 @@
+package coursier.echo;
+
+public class Echo {
+
+    public static void main(String[] args) {
+
+        boolean isFirst = true;
+
+        for (String arg : args) {
+
+            if (isFirst)
+                isFirst = false;
+            else
+                System.out.print(" ");
+
+            System.out.print(arg);
+        }
+
+        System.out.println();
+    }
+
+}

echo/src/main/scala/coursier/echo/Echo.scala

@@ -1,5 +0,0 @@
-
-object Echo {
-  def main(args: Array[String]): Unit =
-    println(args.mkString(" "))
-}

scripts/travis.sh

@@ -181,7 +181,7 @@ publish() {
 testBootstrap() {
   if is211; then
     sbt ++${SCALA_VERSION} echo/publishLocal cli/pack
-    cli/target/pack/bin/coursier bootstrap -o cs-echo io.get-coursier:echo_2.11:1.0.0-SNAPSHOT
+    cli/target/pack/bin/coursier bootstrap -o cs-echo io.get-coursier:echo:1.0.0-SNAPSHOT
     if [ "$(./cs-echo foo)" != foo ]; then
       echo "Error: unexpected output from bootstrapped echo command." 1>&2
       exit 1