How to validate the content in PDF File using TestComplete

Hello, 

I am following the article for testing pdf with the testcomplete. I have configured JVM and the class path as per the instruction. But if I write the loadDocument  function  in TestComplete script unit  it does not receognize the code as it is in JAVA. 

Can you let me know how can I use this code?

function loadDocument(fileName)
{
  var docObj;

  // Load the PDF file to the PDDocument object
  docObj = JavaClasses.org_apache_pdfbox_pdmodel.PDDocument.load_3(fileName);

  // Return the resulting PDDocument object
  return docObj;
}