[quickstart] Error msg in streaming quickstarts when run with wrong number of arguments

flink-quickstart/flink-quickstart-java/src/main/resources/archetype-resources/src/main/java/SocketTextStreamWordCount.java

@@ -57,6 +57,11 @@ public class SocketTextStreamWordCount {
 
 	public static void main(String[] args) throws Exception {
 
+		if (args.length != 2){
+			System.err.println("USAGE:\nSocketTextStreamWordCount <hostname> <port>");
+			return;
+		}
+
 		String hostName = args[0];
 		Integer port = Integer.parseInt(args[1]);
 

flink-quickstart/flink-quickstart-scala/src/main/resources/archetype-resources/src/main/scala/SocketTextStreamWordCount.scala

@@ -45,6 +45,10 @@ import org.apache.flink.streaming.api.scala._
 object SocketTextStreamWordCount {
 
   def main(args: Array[String]) {
+    if (args.length != 2) {
+      System.err.println("USAGE:\nSocketTextStreamWordCount <hostname> <port>")
+      return
+    }
     
     val hostName = args(0)
     val port = args(1).toInt