Apache Zeppelin 0.10.1 Documentation: Java interpreter in Apache Zeppelin

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Apache Zeppelin 0.10.1 Documentation: Java interpreter in Apache Zeppelin</title> <meta name="description" content="Run Java code and any distributed java computation library by importing the dependencies in the interpreter configuration."> <meta name="author" content="The Apache Software Foundation">  <meta name="viewport" content="width=device-width, initial-scale=1.0">   <link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">  <link href="/docs/0.10.1/assets/themes/zeppelin/bootstrap/css/bootstrap.css" rel="stylesheet"> <link href="/docs/0.10.1/assets/themes/zeppelin/css/style.css?body=1" rel="stylesheet" type="text/css"> <link href="/docs/0.10.1/assets/themes/zeppelin/css/syntax.css" rel="stylesheet" type="text/css" media="screen" />    <script src="https://code.jquery.com/jquery-1.10.2.min.js"></script> <script 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href="https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home">Apache Zeppelin Wiki</a></li> <li><a target="_blank" rel="noopener noreferrer" href="http://stackoverflow.com/questions/tagged/apache-zeppelin">Stackoverflow Questions about Zeppelin</a></li> </ul> </li> <li> <a href="/docs/0.10.1/search.html" class="nav-search-link"> <span class="fa fa-search nav-search-icon"></span> </a> </li> </ul> </nav> </div> </div> <div class="content">  <div class="row"> <div class="col-md-12">  <h1>Java interpreter for Apache Zeppelin</h1> <div id="toc"></div> <h2>How to use</h2> <p>Basically, you can write normal java code. You should write the main method inside a class because the interpreter invoke this main to execute the code. Unlike Zeppelin normal pattern, each paragraph is considered as a separate job, there isn't any relation to any other paragraph. For example, a variable defined in one paragraph cannot be used in another one as each paragraph is a self contained java main class that is executed and the output returned to Zeppelin.</p> <p>The following is a demonstration of a word count example with data represented as a java Map and displayed leveraging Zeppelin's built in visualization using the utility method <code>JavaInterpreterUtils.displayTableFromSimpleMap</code>.</p> <div class="highlight"><pre><code class="java language-java" data-lang="java"><span class="o">%</span><span class="n">java</span> <span class="kn">import</span> <span class="nn">java.util.HashMap</span><span class="o">;</span> <span class="kn">import</span> <span class="nn">java.util.Map</span><span class="o">;</span> <span class="kn">import</span> <span class="nn">org.apache.zeppelin.java.JavaInterpreterUtils</span><span class="o">;</span> <span class="kd">public</span> <span class="kd">class</span> <span class="nc">HelloWorld</span> <span class="o">{</span> <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">main</span><span class="o">(</span><span class="n">String</span><span class="o">[]</span> <span class="n">args</span><span class="o">)</span> <span class="o">{</span> <span class="n">Map</span><span class="o"><</span><span class="n">String</span><span class="o">,</span> <span class="n">Long</span><span class="o">></span> <span class="n">counts</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashMap</span><span class="o"><>();</span> <span class="n">counts</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"hello"</span><span class="o">,</span><span class="mi">4L</span><span class="o">);</span> <span class="n">counts</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"world"</span><span class="o">,</span><span class="mi">5L</span><span class="o">);</span> <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">JavaInterpreterUtils</span><span class="o">.</span><span class="na">displayTableFromSimpleMap</span><span class="o">(</span><span class="s">"Word"</span><span class="o">,</span><span class="s">"Count"</span><span class="o">,</span> <span class="n">counts</span><span class="o">));</span> <span class="o">}</span> <span class="o">}</span> </code></pre></div> </div> </div> <hr> <footer>  </footer> </div> <script type="text/javascript"> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-45176241-5', 'zeppelin.apache.org'); ga('require', 'linkid', 'linkid.js'); ga('send', 'pageview'); </script> </body> </html>

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Apache Zeppelin 0.10.1 Documentation: Java interpreter in Apache Zeppelin