title: issue in the generated parser with ANTLR 4.7.1
body: <p>I created a grammar called goal.g4</p>
  
  <p>Then, from terminal (on a mac) I launched
  "java -cp "antlr-4.7.1-complete.jar" org.antlr.v4.Tool goal.g4 -listener -visitor"
  that terminates correctly.</p>
  
  <p>Then I use the following java code:</p>
  
  <pre><code>input = new ANTLRInputStream(fis); /* where fis is a FileInputStream */
  goalLexer lexer = new goalLexer(input);
  CommonTokenStream tokens = new CommonTokenStream(lexer);
  goalParser parser = new goalParser(tokens);
  parser.start();
  </code></pre>
  
  <p>my point is: how to retrieve the ParseTree object from the parser?
  As suggested I replaced the init() method with the start() methods. 
  However eclipse tells me that parser.start() does not exist...</p>
  
  <p>How do I solve this?
  Thanks
  Luca</p>