release.sh in killbill-payment-test-1.6.3 vs release.sh in killbill-payment-test-1.7.0

@@ -1,7 +1,20 @@
 set -e
 
+if [ "GNU" != "$(tar --help | grep GNU | head -1 | awk '{print $1}')" ]; then
+  echo "Unable to release: make sure to use GNU tar"
+  exit 1
+fi
+
+if $(ruby -e'require "java"'); then
+  # Good
+  echo "Detected JRuby"
+else
+  echo "Unable to release: make sure to use JRuby"
+  exit 1
+fi
+
 VERSION=`grep -E '<version>([0-9]+\.[0-9]+\.[0-9]+)</version>' pom.xml | sed 's/[\t \n]*<version>\(.*\)<\/version>[\t \n]*/\1/'`
 if [ "$VERSION" != "$(cat $PWD/VERSION)" ]; then
   echo "Unable to release: make sure the versions in pom.xml and VERSION match"
   exit 1
 fi
@@ -16,10 +29,10 @@
 rake killbill:package
 
 ARTIFACT="$PWD/pkg/killbill-payment-test-$VERSION.tar.gz"
 echo "Pushing $ARTIFACT to Maven Central"
 mvn gpg:sign-and-deploy-file \
-    -DgroupId=com.ning.killbill.ruby \
+    -DgroupId=org.kill-bill.billing.plugin.ruby \
     -DartifactId=payment-test-plugin \
     -Dversion=$VERSION \
     -Dpackaging=tar.gz \
     -DrepositoryId=ossrh-releases \
     -Durl=https://oss.sonatype.org/service/local/staging/deploy/maven2/ \