Add getting started hello world sample for Endpoints gRPC.

endpoints/getting-started-grpc/.gitignore

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+.gradle/
+api/build/
+client/build/
+out.pb
+server/build/

endpoints/getting-started-grpc/Dockerfile

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+# https://github.com/GoogleCloudPlatform/openjdk-runtime
+FROM gcr.io/google_appengine/openjdk8
+
+RUN apt-get update \
+    && apt-get -y -q upgrade \
+    && rm -rf /var/lib/apt/lists/*
+
+ADD ./server/build/libs/server.jar /hello/server.jar
+
+ENTRYPOINT ["java", "-jar", "/hello/server.jar"]

endpoints/getting-started-grpc/README.md

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+# Endpoints Getting Started with gRPC & Java Quickstart
+
+It is assumed that you have a working gRPC and Java environment.
+
+1. Build the code:
+
+    ```
+    ./gradlew build
+    ```
+
+1. Test running the code, optional:
+
+    ```
+    # In the background or another terminal run the server:
+    java -jar server/build/libs/server.jar
+
+    # Check the client parameters:
+    java -jar client/build/libs/client.jar --help
+
+    # Run the client
+    java -jar client/build/libs/client.jar --greetee 'Endpoints!'
+    ```
+
+1. Generate the `out.pb` from the proto file.
+
+    ```
+    protoc --include_imports --include_source_info api/src/main/proto/helloworld.proto --descriptor_set_out out.pb
+    ```
+
+1. Edit, `api_config.yaml`. Replace `MY_PROJECT_ID` with your project id.
+
+1. Deploy your service config to Service Management:
+
+    ```
+    gcloud service-management deploy out.pb api_config.yaml
+    # The Config ID should be printed out, looks like: 2017-02-01r0, remember this
+
+    # set your project to make commands easier
+    GCLOUD_PROJECT=<Your Project ID>
+
+    # Print out your Config ID again, in case you missed it
+    gcloud service-management configs list --service hellogrpc.endpoints.${GCLOUD_PROJECT}.cloud.goog
+    ```
+
+1. Also get an API key from the Console's API Manager for use in the client later. (https://console.cloud.google.com/apis/credentials)
+
+1. Build a docker image for your gRPC server, store in your Registry
+
+    ```
+    gcloud container builds submit --tag gcr.io/${GCLOUD_PROJECT}/java-grpc-hello:1.0 .
+    ```
+
+1. Either deploy to GCE (below) or GKE (further down)
+
+### GCE
+
+1. Create your instance and ssh in.
+
+    ```
+    gcloud compute instances create grpc-host --image-family gci-stable --image-project google-containers --tags=http-server
+    gcloud compute ssh grpc-host
+    ```
+
+1. Set some variables to make commands easier
+
+    ```
+    GCLOUD_PROJECT=$(curl -s "http://metadata.google.internal/computeMetadata/v1/project/project-id" -H "Metadata-Flavor: Google")
+    SERVICE_NAME=hellogrpc.endpoints.${GCLOUD_PROJECT}.cloud.goog
+    SERVICE_CONFIG_ID=<Your Config ID>
+    ```
+
+1. Pull your credentials to access Container Registry, and run your gRPC server container
+
+    ```
+    /usr/share/google/dockercfg_update.sh
+    docker run -d --name=grpc-hello gcr.io/${GCLOUD_PROJECT}/java-grpc-hello:1.0
+    ```
+
+1. Run the Endpoints proxy
+
+    ```
+    docker run --detach --name=esp \
+        -p 80:9000 \
+        --link=grpc-hello:grpc-hello \
+        gcr.io/endpoints-release/endpoints-runtime:1 \
+        -s ${SERVICE_NAME} \
+        -v ${SERVICE_CONFIG_ID} \
+        -P 9000 \
+        -a grpc://grpc-hello:50051
+    ```
+
+1. Back on your local machine, get the external IP of your GCE instance.
+
+    ```
+    gcloud compute instances list
+    ```
+
+1. Run the client
+
+    ```
+    java -jar client/build/libs/client.jar --host <IP of GCE Instance>:80 --api_key <API Key from Console>
+    ```
+
+### GKE
+
+1. Create a cluster
+
+    ```
+    gcloud container clusters create my-cluster
+    ```
+
+1. Edit `container-engine.yaml`. Replace `SERVICE_NAME`, `SERVICE_CONFIG_ID`, and `GCLOUD_PROJECT` with your values.
+
+1. Deploy to GKE
+
+    ```
+    kubectl create -f ./container-engine.yaml
+    ```
+
+1. Get IP of load balancer, run until you see an External IP.
+
+    ```
+    kubectl get svc grpc-hello
+    ```
+
+1. Run the client
+
+    ```
+    java -jar client/build/libs/client.jar --host <IP of GKE LoadBalancer>:80 --api_key <API Key from Console>
+    ```

endpoints/getting-started-grpc/api/build.gradle

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+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+apply plugin: 'java'
+apply plugin: 'com.google.protobuf'
+
+buildscript {
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.0'
+
+  }
+}
+
+def grpcVersion = '1.0.3'
+
+dependencies {
+  repositories {
+    mavenCentral()
+  }
+  compile "io.grpc:grpc-netty:${grpcVersion}"
+  compile "io.grpc:grpc-protobuf:${grpcVersion}"
+  compile "io.grpc:grpc-stub:${grpcVersion}"
+}
+
+protobuf {
+  protoc {
+    artifact = 'com.google.protobuf:protoc:3.0.2'
+  }
+
+  plugins {
+    grpc {
+      artifact = "io.grpc:protoc-gen-grpc-java:${grpcVersion}"
+    }
+  }
+  generateProtoTasks {
+    all()*.plugins {
+      grpc {}
+    }
+  }
+}

endpoints/getting-started-grpc/api/src/main/proto/helloworld.proto

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+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "com.google.endpoints.examples.hello";
+option java_outer_classname = "HelloWorldProto";
+
+package helloworld;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}

endpoints/getting-started-grpc/api_config.yaml

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+# Copyright 2017 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+#
+# An example API configuration.
+#
+# Below, replace MY_PROJECT_ID with your Google Cloud Project ID.
+#
+
+# The configuration schema is defined by service.proto file
+# https://github.com/googleapis/googleapis/blob/master/google/api/service.proto
+type: google.api.Service
+config_version: 3
+
+#
+# Name of the service configuration.
+#
+name: hellogrpc.endpoints.MY_PROJECT_ID.cloud.goog
+
+#
+# API title to appear in the user interface (Google Cloud Console).
+#
+title: Hello gRPC API
+apis:
+- name: helloworld.Greeter

endpoints/getting-started-grpc/build.gradle

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+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+subprojects {
+  apply plugin: 'java'
+
+  repositories {
+    mavenCentral()
+  }
+}

endpoints/getting-started-grpc/client/build.gradle

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+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+apply plugin: 'application'
+
+mainClassName = "com.google.endpoints.examples.hello.HelloWorldClient"
+
+jar {
+  manifest {
+    attributes "Main-Class": "$mainClassName"
+  }
+  from {
+    configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
+  }
+}
+
+dependencies {
+  compile project(':api')
+  compile 'commons-cli:commons-cli:1.3'
+}