Binding array values in playframework

I have a get some array of inputs from user, say years[], and process the values in my controller.

Here is my code:

Controller:
The controller code tries to bind the form data. In my case, get the array of years value from the html form:

Form<FinStatementInput> ipForm = Form.form(FinStatementInput.class).bindFromRequest();//Array out of bound exception is thrown at this line.
    if (ipForm.hasErrors()) {
        return badRequest("<h1>error</h1>").as("text/html");
    } else {
        FinStatementInput ip = ipForm.get();
        System.out.println("first year input(to test)>>"+ ip.years[0]);
        return ok();
    }

FinStatementInput 

Model:

public int[] years;//array declaration
.
.
FinStatmentInput (int[] years) {
this.years = years; // in the constructor
}

HTML:

<form id="Start Here" name="Start Here" style="display: none;"
    action="@routes.Application.calculate()" method="post">
   <table class="table table-condensed">
    <tr>
      <td id="tdInput" >
            <div class="input-group">
            <span class="input-group-addon">Year 1</span> <input name="years[0]" id="GreenInput"
             pattern="[0-9.]+" type="text" class="form-control" required="required">
            </div></td>
      <td id="tdInput" >
            <div class="input-group">
            <span class="input-group-addon">Year 2</span> <input name="years[1]" id="GreenInput"
            pattern="[0-9.]+" type="text" class="form-control" required="required">
            </div></td>
      <td id="tdInput" >
            <div class="input-group">
            <span class="input-group-addon">Year 3</span> <input name="years[2]" id="GreenInput"
            pattern="[0-9.]+" type="text" class="form-control" required="required">
            </div></td>
      <td id="tdInput" >
            <div class="input-group">`    ... like this input fields for all years needed ,say 10 years.

I get this run time exception:

 [InvalidPropertyException: Invalid property 'years[1]' of bean class [models.FinStatementInput]: Invalid array index in property path 'years[5]'; nested exception is java.lang.**ArrayIndexOutOfBoundsException**]

I have not specified the size of array anywhere explicitly in the code; Just declared empty array of years and trying to bind bunch of years from user form. I want to access all the array element of years, say, from 1 to 10. But I don't know where is the mistake that leads to ArryOutOfBound Exception. Any help is appreciated.

The mistake is in array declaration in model class. modifying like in below line works fine. Array is declared, but not instantiated. #silly mistake though.

public int[] years = new int[10];