Hello.

I did not used the form component for a while, So I may be wrong (but see this doc)

First, I pushed to code to ease understatement: lyrixx/symfony-standard@d203604

Basically, I create a form without data but with a data_class.
My "Entity" class have default values, So I expected to see the default values as the form default values. But instead, my form is empty:

If I inspect the HTML, I can see this (manually indented):

<form name="foo" method="post" action="">
    <div id="foo">
        <div>
            <label for="foo_enabled" class="required">Enabled</label>
            <input type="checkbox" id="foo_enabled" name="foo[enabled]" required="required" value="1" />
        </div>
        <div>
            <label for="foo_name" class="required">Name</label>
            <input type="text" id="foo_name" name="foo[name]" required="required" />
        </div>
        <input type="hidden" id="foo__token" name="foo[_token]" value="_Y4JKjDkfmIaaiAmtoOWDz6QQDpHLy0La2dtbzue2Q4" />
    </div>
</form>

First you can note the value="1" in the checkbox input.
Then, there is no value for the name.

I tried few symfony version from v2.6.3 to 2.7.6, it's always the same things.

So I tried to use empty_data => same result.

So, again, I tried to lower symfony requirement => same result for symfony 2.6.3

So I finally tried symfony 2.3 => and again, same result.

So, It could be nice to use the empty_data option to populate the form