updated with new example code location and build

java/README.md

@@ -1,17 +1,13 @@
 gRPC in 3 minutes (Java)
 ========================
 
-BACKGROUND
--------------
-For this sample, we've already generated the server and client stubs from [helloworld.proto](https://github.com/grpc/grpc-common/blob/master/protos/helloworld.proto). 
-
 PREREQUISITES
 -------------
 
 - [Java 8](http://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html)
 
 - [Maven 3.2 or later](http://maven.apache.org/download.cgi).
-  - this is needed to install Netty5, a dependency of gRPC, and to build this sample
+  - this is needed to install Netty5, a dependency of gRPC
 
 INSTALL
 -------
@@ -29,30 +25,24 @@ $ cd grpc-java
 $ # follow the instructions in 'How to Build'
 ```
 
-3 Clone this repo, if you've not already done so.
-```sh
-$ cd <path/to/your/working_dir>
-$ git clone https://github.com/grpc/grpc-common
-$ cd grpc-common/java  # switch to this directory
-```
-
-4 Build the samples
-```sh
-$ # from this directory
-$ mvn package
-```
-
 TRY IT!
 -------
 
-- Run the server
+Our [Gradle build file](https://github.com/grpc/grpc-java/blob/master/examples/build.gradle) simplifies building and running the examples.
+
+You can build and run the Hello World server used in [Getting started](https://github.com/grpc/grpc-common) from the `grpc-java` root folder with:
+
 ```sh
-$ # from this directory
+$ ./gradlew :grpc-examples:helloWorldServer
-$ ./run_greeter_server.sh &
 ```
 
-- Run the client
+and in another terminal window confirm that it receives a message.
+
 ```sh
-$ # from this directory
+$  ./gradlew :grpc-examples:helloWorldClient
-$ ./run_greeter_client.sh
 ```
+
+TUTORIAL
+--------
+
+You can find a more detailed tutorial in [gRPC Basics: Java](https://github.com/grpc/grpc-common/blob/master/java/javatutorial.md).