FailingPasswordField.java

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.HtmlPasswordInput;

public class FailingPasswordField {
    
    public static void main(String[] args) throws Exception {
        WebClient wc = new WebClient();
        HtmlPage page = wc.getPage("file:///tmp/form.html");
        
        HtmlPasswordInput passwordField = (HtmlPasswordInput)page.getElementById("form_password");
        passwordField.setValueAttribute(""); // clear the field before typing
        
        for (char c : "mypassword".toCharArray()) {
            passwordField.type(c);
        }
        
        System.out.println(passwordField.getAttribute("value"));
        wc.closeAllWindows();
    }
}

form.html

<h1>Form</h1>

<form action="/form" method="post">
  <p>
    <label for="form_first_name">First Name</label>
    <input type="text" name="form[first_name]" value="John" id="form_first_name"/>
  </p>

  <p>
    <label for="form_last_name">Last Name</label>
    <input type="text" name="form[last_name]" value="Smith" id="form_last_name"/>
  </p>

  <p>
    <label for="form_password">Password</label>
    <input type="password" name="form[password]" value="seeekrit" id="form_password"/>
  </p>
  
  <p>
    <label for="form_image">Image</label>
    <input type="file" name="form[image]" id="form_image"/>
  </p>
  
  <p>
    <input type="hidden" name="form[token]" value="12345" id="form_token"/>
  </p>

  <p>
    <label for="form_locale">Locale</label>
    <select name="form[locale]" id="form_locale">
      <option value="sv">Swedish</option>
      <option selected="selected" value="en">English</option>
      <option value="fi">Finish</option>
      <option value="no">Norwegian</option>
    </select>
  </p>

  <p>
    <label for="form_region">Region</label>
    <select name="form[region]" id="form_region">
      <option>Sweden</option>
      <option selected="selected">Norway</option>
      <option>Finland</option>
    </select>
  </p>

  <p>
    <label for="form_city">City</label>
    <select name="form[city]" id="form_city">
      <option>London</option>
      <option>Stockholm</option>
      <option>Paris</option>
    </select>
  </p>

  <p>
    <label for="form_tendency">Tendency</label>
    <select name="form[tendency]" id="form_tendency"></select>
  </p>

  <p>
    <label for="form_description">Description</label></br>
    <textarea name="form[description]" id="form_description">Descriptive text goes here</textarea>
  <p>

  <p>
    <input type="radio" name="form[gender]" value="male" id="gender_male"/>
    <label for="gender_male">Male</label>
    <input type="radio" name="form[gender]" value="female" id="gender_female" checked="checked"/>
    <label for="gender_female">Female</label>
    <input type="radio" name="form[gender]" value="both" id="gender_both"/>
    <label for="gender_both">Both</label>
  </p>

  <p>
    <input type="checkbox" value="dog" name="form[pets][]" id="form_pets_dog" checked="checked"/>
    <label for="form_pets_dog">Dog</label>
    <input type="checkbox" value="cat" name="form[pets][]" id="form_pets_cat"/>
    <label for="form_pets_cat">Cat</label>
    <input type="checkbox" value="hamster" name="form[pets][]" id="form_pets_hamster" checked="checked"/>
    <label for="form_pets_hamster">Hamster</label>
  </p>

  <p>
    <input type="submit" name="form[awesome]" id="awe123" value="awesome"/>
    <input type="submit" name="form[crappy]" id="crap321" value="crappy"/>
    <input type="image" name="form[okay]" id="okay556" value="okay"/>
  </p>
</form>

<form action="/form/get?foo=bar" method="get">
  <p>
    <label for="form_middle_name">Middle Name</label>
    <input type="text" name="form[middle_name]" value="Darren" id="form_middle_name"/>
  </p>

  <p>
    <input type="submit" name="form[mediocre]" id="mediocre" value="med"/>
  <p>
</form>

<form action="/upload" method="post" enctype="multipart/form-data">
  <p>
    <label for="form_document">Document</label>
    <input type="file" name="form[document]" id="form_document"/>
  </p>
 
  <p>
    <input type="submit" value="Upload"/>
  <p>
</form>

<form action="/redirect" method="post">
  <p>
    <input type="submit" value="Go FAR"/>
  </p>
</form>

stacktrace.txt

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 8
	at java.lang.String.substring(String.java:1934)
	at com.gargoylesoftware.htmlunit.html.DoTypeProcessor.doType(DoTypeProcessor.java:40)
	at com.gargoylesoftware.htmlunit.html.HtmlPasswordInput.doType(HtmlPasswordInput.java:130)
	at com.gargoylesoftware.htmlunit.html.HtmlElement.type(HtmlElement.java:477)
	at com.gargoylesoftware.htmlunit.html.HtmlElement.type(HtmlElement.java:444)
	at FailingPasswordField.main(FailingPasswordField.java:19)