Binding multivalue fields to a command object

[rafeco]

I've searched the form and haven't found an answer to this question.

Let's say that a SimpleFormController receives a POST that looks like this:

foo=value1
bar=value2
bar=value3
bar=value4

I have a command class that looks like this:

public class MyCommand
{
    private String[] foo;
    private String[] bar;

    public void setFoo(String[] foo) { this.foo = foo; }
    public String[] getFoo() { return foo; }

    public void setBar(String[] bar) { this.bar = bar; }
    public String[] getBar() { return bar; }

}

Ignore any syntax errors in that code, I just typed it in by hand as an example.

The question is, how do I get value2, value3, and value4 to appear as elements of the array bar[] in my code? Right now, binding assigns "value1" to "foo" (correct) and "value2" to "bar". Even more oddly, if I had:

bar=new york, ny
bar=value3
bar=value4

In my command object, I wind up with "bar" containing two elements, "new york" and "ny".

What am I missing?