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<div class="section" id="creating-a-cordapp">
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<h1>Creating a Cordapp<a class="headerlink" href="#creating-a-cordapp" title="Permalink to this headline">¶</a></h1>
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<p>A Cordapp is an application that runs on the Corda platform using the platform APIs and plugin system. They are self
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contained in separate JARs from the node server JAR that are created and distributed.</p>
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<div class="section" id="app-plugins">
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<h2>App Plugins<a class="headerlink" href="#app-plugins" title="Permalink to this headline">¶</a></h2>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Currently apps are only supported for JVM languages.</p>
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</div>
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<p>To create an app plugin you must you must extend from <a class="reference external" href="api/com.r3corda.core.node/-corda-plugin-registry/index.html">CordaPluginRegistry</a>. The JavaDoc contains
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specific details of the implementation, but you can extend the server in the following ways:</p>
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<ol class="arabic simple">
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<li>Required protocols: Specify which protocols will be whitelisted for use in your web APIs.</li>
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<li>Service plugins: Register your services (see below).</li>
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<li>Web APIs: You may register your own endpoints under /api/ of the built-in web server.</li>
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<li>Static web endpoints: You may register your own static serving directories for serving web content.</li>
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</ol>
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</div>
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<div class="section" id="services">
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<h2>Services<a class="headerlink" href="#services" title="Permalink to this headline">¶</a></h2>
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<p>Services are classes which are constructed after the node has started. It is provided a <a class="reference external" href="api/com.r3corda.node.services.api/-service-hub-internal/index.html">ServiceHubInternal</a> which
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allows a richer API than the <a class="reference external" href="api/com.r3corda.node.services.api/-service-hub/index.html">ServiceHub</a> exposed to contracts. It enables adding protocols, registering
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message handlers and more. The service does not run in a separate thread, so the only entry point to the service is during
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construction, where message handlers should be registered and threads started.</p>
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</div>
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<div class="section" id="starting-nodes">
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<h2>Starting Nodes<a class="headerlink" href="#starting-nodes" title="Permalink to this headline">¶</a></h2>
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<p>To use an app you must also have a node server. To create a node server run the gradle installTemplateNodes task.</p>
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<p>This will output the node JAR to <code class="docutils literal"><span class="pre">build/libs/corda.jar</span></code> and several sample/standard
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node setups to <code class="docutils literal"><span class="pre">build/nodes</span></code>. For now you can use the <code class="docutils literal"><span class="pre">build/nodes/nodea</span></code> configuration as a template.</p>
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<p>Each node server by default must have a <code class="docutils literal"><span class="pre">node.conf</span></code> file in the current working directory. After first
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execution of the node server there will be many other configuration and persistence files created in a node workspace directory. This is specified as the basedir property of the node.conf file, or else can be overidden using <code class="docutils literal"><span class="pre">--base-directory=<workspace></span></code>.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Outside of development environments do not store your node directories in the build folder.</p>
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</div>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">Also note that the bootstrapping process of the <code class="docutils literal"><span class="pre">corda.jar</span></code> unpacks the Corda dependencies into a temporary folder. It is therefore suggested that the CAPSULE_CACHE_DIR environment variable be set before starting the process to control this location.</p>
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</div>
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</div>
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<div class="section" id="installing-apps">
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<h2>Installing Apps<a class="headerlink" href="#installing-apps" title="Permalink to this headline">¶</a></h2>
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<p>Once you have created your app JAR you can install it to a node by adding it to <code class="docutils literal"><span class="pre"><node_dir>/plugins/</span></code>. In this
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case the <code class="docutils literal"><span class="pre">node_dir</span></code> is the location where your node server’s JAR and configuration file is.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">If the directory does not exist you can create it manually.</p>
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</div>
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</div>
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<div class="section" id="starting-your-node">
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<h2>Starting your Node<a class="headerlink" href="#starting-your-node" title="Permalink to this headline">¶</a></h2>
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<p>Now you have a node server with your app installed, you can run it by navigating to <code class="docutils literal"><span class="pre"><node_dir></span></code> and running</p>
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<blockquote>
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<div>java -jar corda.jar</div></blockquote>
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<p>The plugin should automatically be registered and the configuration file used.</p>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">If your working directory is not <code class="docutils literal"><span class="pre"><node_dir></span></code> your plugins and configuration will not be used.</p>
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</div>
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<p>The configuration file and workspace paths can be overidden on the command line e.g.</p>
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<p><code class="docutils literal"><span class="pre">java</span> <span class="pre">-jar</span> <span class="pre">corda.jar</span> <span class="pre">--config-file=test.conf</span> <span class="pre">--base-directory=/opt/r3corda/nodes/test</span></code>.</p>
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<p>Otherwise the workspace folder for the node is created based upon the <code class="docutils literal"><span class="pre">basedir</span></code> property in the <code class="docutils literal"><span class="pre">node.conf</span></code> file and if this is relative it is applied relative to the current working path.</p>
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</div>
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<div class="section" id="debugging-your-node">
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<h2>Debugging your Node<a class="headerlink" href="#debugging-your-node" title="Permalink to this headline">¶</a></h2>
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<p>To enable remote debugging of the corda process use a command line such as:</p>
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<p><code class="docutils literal"><span class="pre">java</span> <span class="pre">-Dcapsule.jvm.args="-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005"</span> <span class="pre">-jar</span> <span class="pre">corda.jar</span></code></p>
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<p>This command line will start the debugger on port 5005 and pause the process awaiting debugger attachment.</p>
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