bootstrap navbar not working correctly

Perhaps the path to your bootstrap.min.css is collapsed? I just added this link to your header <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> and pointed to the data-target="#bs-example-navbar-collapse-1". It seems working now.

<html>
<head>
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
<link href="static/css/myCss.css" rel="stylesheet">
<meta charset="UTF-8">
<link href="static/css/bootstrap.min.css" rel="stylesheet" media="screen">
<link href="static/css/customIndex.css" rel="stylesheet">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="static/css/bootstrap-responsive.css" rel="stylesheet">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<title>Index</title>
</head>
<body>

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
    </div>
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="./index.jsp">Index</a></li>
        <li><a href="./profile.jsp">Profile</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="./LogoutServlet">Logout</a></li>
      </ul>

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