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<h8>Quick Start</h8>
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<h3 style="margin-top:0px;">Java Quickstart</h3>
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<p class="lead">This guide gets you started with gRPC in Java with a simple
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working example.</p>
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<div id="toc"></div>
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<h3 id="before-you-begin">Before you begin</h3>
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<h4 id="prerequisites">Prerequisites</h4>
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<ul>
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<li><code>JDK</code>: version 7 or higher</li>
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</ul>
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<h3 id="download-the-example">Download the example</h3>
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<p>You’ll need a local copy of the example code to work through this quickstart.
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Download the example code from our GitHub repository (the following command
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clones the entire repository, but you just need the examples for this quickstart
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and other tutorials):</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh">$ <span style="color:#75715e"># Clone the repository at the latest release to get the example code:</span>
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$ git clone -b v1.20.0 https://github.com/grpc/grpc-java
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$ <span style="color:#75715e"># Navigate to the Java examples:</span>
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$ cd grpc-java/examples</code></pre></div>
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<h3 id="run-a-grpc-application">Run a gRPC application</h3>
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<p>From the <code>examples</code> directory:</p>
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<ol>
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<li>Compile the client and server</li>
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</ol>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./gradlew installDist</code></pre></div>
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<ol>
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<li>Run the server</li>
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</ol>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./build/install/examples/bin/hello-world-server</code></pre></div>
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<ol>
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<li>In another terminal, run the client</li>
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</ol>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./build/install/examples/bin/hello-world-client</code></pre></div>
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<p>Congratulations! You’ve just run a client-server application with gRPC.</p>
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<h3 id="update-a-grpc-service">Update a gRPC service</h3>
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<p>Now let’s look at how to update the application with an extra method on the
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server for the client to call. Our gRPC service is defined using protocol
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buffers; you can find out lots more about how to define a service in a <code>.proto</code>
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file in <a href="/docs/tutorials/basic/java/">gRPC Basics: Java</a>. For now all you need to know is that both the
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server and the client “stub” have a <code>SayHello</code> RPC method that takes a
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<code>HelloRequest</code> parameter from the client and returns a <code>HelloReply</code> from the
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server, and that this method is defined like this:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#75715e">// The greeting service definition.
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</span><span style="color:#75715e"></span>service Greeter <span style="color:#f92672">{</span>
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<span style="color:#75715e">// Sends a greeting
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</span><span style="color:#75715e"></span> rpc <span style="color:#a6e22e">SayHello</span> <span style="color:#f92672">(</span>HelloRequest<span style="color:#f92672">)</span> returns <span style="color:#f92672">(</span>HelloReply<span style="color:#f92672">)</span> <span style="color:#f92672">{}</span>
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<span style="color:#f92672">}</span>
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<span style="color:#75715e">// The request message containing the user's name.
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</span><span style="color:#75715e"></span>message HelloRequest <span style="color:#f92672">{</span>
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string name <span style="color:#f92672">=</span> 1<span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span>
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<span style="color:#75715e">// The response message containing the greetings
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</span><span style="color:#75715e"></span>message HelloReply <span style="color:#f92672">{</span>
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string message <span style="color:#f92672">=</span> 1<span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span></code></pre></div>
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<p>Let’s update this so that the <code>Greeter</code> service has two methods. Edit
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<code>src/main/proto/helloworld.proto</code> and update it with a new <code>SayHelloAgain</code>
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method, with the same request and response types:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#75715e">// The greeting service definition.
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</span><span style="color:#75715e"></span>service Greeter <span style="color:#f92672">{</span>
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<span style="color:#75715e">// Sends a greeting
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</span><span style="color:#75715e"></span> rpc <span style="color:#a6e22e">SayHello</span> <span style="color:#f92672">(</span>HelloRequest<span style="color:#f92672">)</span> returns <span style="color:#f92672">(</span>HelloReply<span style="color:#f92672">)</span> <span style="color:#f92672">{}</span>
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<span style="color:#75715e">// Sends another greeting
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</span><span style="color:#75715e"></span> rpc <span style="color:#a6e22e">SayHelloAgain</span> <span style="color:#f92672">(</span>HelloRequest<span style="color:#f92672">)</span> returns <span style="color:#f92672">(</span>HelloReply<span style="color:#f92672">)</span> <span style="color:#f92672">{}</span>
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<span style="color:#f92672">}</span>
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<span style="color:#75715e">// The request message containing the user's name.
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</span><span style="color:#75715e"></span>message HelloRequest <span style="color:#f92672">{</span>
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string name <span style="color:#f92672">=</span> 1<span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span>
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<span style="color:#75715e">// The response message containing the greetings
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</span><span style="color:#75715e"></span>message HelloReply <span style="color:#f92672">{</span>
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string message <span style="color:#f92672">=</span> 1<span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span></code></pre></div>
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<p>(Don’t forget to save the file!)</p>
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<h3 id="update-and-run-the-application">Update and run the application</h3>
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<p>When we recompile the example, normal compilation will regenerate
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<code>GreeterGrpc.java</code>, which contains our generated gRPC client and server classes.
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This also regenerates classes for populating, serializing, and retrieving our
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request and response types.</p>
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<p>However, we still need to implement and call the new method in the human-written
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parts of our example application.</p>
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<h4 id="update-the-server">Update the server</h4>
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<p>In the same directory, open
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<code>src/main/java/io/grpc/examples/helloworld/HelloWorldServer.java</code>. Implement the
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new method like this:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">private</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">GreeterImpl</span> <span style="color:#66d9ef">extends</span> GreeterGrpc<span style="color:#f92672">.</span><span style="color:#a6e22e">GreeterImplBase</span> <span style="color:#f92672">{</span>
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<span style="color:#a6e22e">@Override</span>
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<span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">sayHello</span><span style="color:#f92672">(</span>HelloRequest req<span style="color:#f92672">,</span> StreamObserver<span style="color:#f92672"><</span>HelloReply<span style="color:#f92672">></span> responseObserver<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
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HelloReply reply <span style="color:#f92672">=</span> HelloReply<span style="color:#f92672">.</span><span style="color:#a6e22e">newBuilder</span><span style="color:#f92672">().</span><span style="color:#a6e22e">setMessage</span><span style="color:#f92672">(</span><span style="color:#e6db74">"Hello "</span> <span style="color:#f92672">+</span> req<span style="color:#f92672">.</span><span style="color:#a6e22e">getName</span><span style="color:#f92672">()).</span><span style="color:#a6e22e">build</span><span style="color:#f92672">();</span>
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responseObserver<span style="color:#f92672">.</span><span style="color:#a6e22e">onNext</span><span style="color:#f92672">(</span>reply<span style="color:#f92672">);</span>
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responseObserver<span style="color:#f92672">.</span><span style="color:#a6e22e">onCompleted</span><span style="color:#f92672">();</span>
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<span style="color:#f92672">}</span>
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<span style="color:#a6e22e">@Override</span>
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<span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">sayHelloAgain</span><span style="color:#f92672">(</span>HelloRequest req<span style="color:#f92672">,</span> StreamObserver<span style="color:#f92672"><</span>HelloReply<span style="color:#f92672">></span> responseObserver<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
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HelloReply reply <span style="color:#f92672">=</span> HelloReply<span style="color:#f92672">.</span><span style="color:#a6e22e">newBuilder</span><span style="color:#f92672">().</span><span style="color:#a6e22e">setMessage</span><span style="color:#f92672">(</span><span style="color:#e6db74">"Hello again "</span> <span style="color:#f92672">+</span> req<span style="color:#f92672">.</span><span style="color:#a6e22e">getName</span><span style="color:#f92672">()).</span><span style="color:#a6e22e">build</span><span style="color:#f92672">();</span>
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responseObserver<span style="color:#f92672">.</span><span style="color:#a6e22e">onNext</span><span style="color:#f92672">(</span>reply<span style="color:#f92672">);</span>
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responseObserver<span style="color:#f92672">.</span><span style="color:#a6e22e">onCompleted</span><span style="color:#f92672">();</span>
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<span style="color:#f92672">}</span>
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<span style="color:#f92672">}</span>
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<span style="color:#f92672">...</span></code></pre></div>
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<h4 id="update-the-client">Update the client</h4>
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<p>In the same directory, open
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<code>src/main/java/io/grpc/examples/helloworld/HelloWorldClient.java</code>. Call the new
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method like this:</p>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">void</span> <span style="color:#a6e22e">greet</span><span style="color:#f92672">(</span>String name<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
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logger<span style="color:#f92672">.</span><span style="color:#a6e22e">info</span><span style="color:#f92672">(</span><span style="color:#e6db74">"Will try to greet "</span> <span style="color:#f92672">+</span> name <span style="color:#f92672">+</span> <span style="color:#e6db74">" ..."</span><span style="color:#f92672">);</span>
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HelloRequest request <span style="color:#f92672">=</span> HelloRequest<span style="color:#f92672">.</span><span style="color:#a6e22e">newBuilder</span><span style="color:#f92672">().</span><span style="color:#a6e22e">setName</span><span style="color:#f92672">(</span>name<span style="color:#f92672">).</span><span style="color:#a6e22e">build</span><span style="color:#f92672">();</span>
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HelloReply response<span style="color:#f92672">;</span>
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<span style="color:#66d9ef">try</span> <span style="color:#f92672">{</span>
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response <span style="color:#f92672">=</span> blockingStub<span style="color:#f92672">.</span><span style="color:#a6e22e">sayHello</span><span style="color:#f92672">(</span>request<span style="color:#f92672">);</span>
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<span style="color:#f92672">}</span> <span style="color:#66d9ef">catch</span> <span style="color:#f92672">(</span>StatusRuntimeException e<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
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logger<span style="color:#f92672">.</span><span style="color:#a6e22e">log</span><span style="color:#f92672">(</span>Level<span style="color:#f92672">.</span><span style="color:#a6e22e">WARNING</span><span style="color:#f92672">,</span> <span style="color:#e6db74">"RPC failed: {0}"</span><span style="color:#f92672">,</span> e<span style="color:#f92672">.</span><span style="color:#a6e22e">getStatus</span><span style="color:#f92672">());</span>
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<span style="color:#66d9ef">return</span><span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span>
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logger<span style="color:#f92672">.</span><span style="color:#a6e22e">info</span><span style="color:#f92672">(</span><span style="color:#e6db74">"Greeting: "</span> <span style="color:#f92672">+</span> response<span style="color:#f92672">.</span><span style="color:#a6e22e">getMessage</span><span style="color:#f92672">());</span>
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<span style="color:#66d9ef">try</span> <span style="color:#f92672">{</span>
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response <span style="color:#f92672">=</span> blockingStub<span style="color:#f92672">.</span><span style="color:#a6e22e">sayHelloAgain</span><span style="color:#f92672">(</span>request<span style="color:#f92672">);</span>
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<span style="color:#f92672">}</span> <span style="color:#66d9ef">catch</span> <span style="color:#f92672">(</span>StatusRuntimeException e<span style="color:#f92672">)</span> <span style="color:#f92672">{</span>
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logger<span style="color:#f92672">.</span><span style="color:#a6e22e">log</span><span style="color:#f92672">(</span>Level<span style="color:#f92672">.</span><span style="color:#a6e22e">WARNING</span><span style="color:#f92672">,</span> <span style="color:#e6db74">"RPC failed: {0}"</span><span style="color:#f92672">,</span> e<span style="color:#f92672">.</span><span style="color:#a6e22e">getStatus</span><span style="color:#f92672">());</span>
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<span style="color:#66d9ef">return</span><span style="color:#f92672">;</span>
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<span style="color:#f92672">}</span>
|
|
logger<span style="color:#f92672">.</span><span style="color:#a6e22e">info</span><span style="color:#f92672">(</span><span style="color:#e6db74">"Greeting: "</span> <span style="color:#f92672">+</span> response<span style="color:#f92672">.</span><span style="color:#a6e22e">getMessage</span><span style="color:#f92672">());</span>
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<span style="color:#f92672">}</span></code></pre></div>
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<h4 id="run">Run!</h4>
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<p>Just like we did before, from the <code>examples</code> directory:</p>
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<ol>
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<li>Compile the client and server</li>
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</ol>
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./gradlew installDist</code></pre></div>
|
|
<ol>
|
|
<li>Run the server</li>
|
|
</ol>
|
|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./build/install/examples/bin/hello-world-server</code></pre></div>
|
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<ol>
|
|
<li>In another terminal, run the client</li>
|
|
</ol>
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|
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-sh" data-lang="sh"> $ ./build/install/examples/bin/hello-world-client</code></pre></div>
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<h3 id="what-s-next">What’s next</h3>
|
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<ul>
|
|
<li>Read a full explanation of how gRPC works in <a href="/docs/guides/">What is gRPC?</a>
|
|
and <a href="/docs/guides/concepts/">gRPC Concepts</a></li>
|
|
<li>Work through a more detailed tutorial in <a href="/docs/tutorials/basic/java/">gRPC Basics: Java</a></li>
|
|
<li>Explore the gRPC Java core API in its <a href="/grpc-java/javadoc/">reference
|
|
documentation</a></li>
|
|
</ul>
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</div>
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</div>
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