Issue
Im using tomcat 9, java, bootstrap to develop a online forum. Suddenly the navigation is not working, i tried a few things but no luck. In the chrome network inspector tab everything seems fine.
<!DOCTYPE html>
<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">
<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 collapsed" data-toggle="collapse" data-target=".navbar-collapse" 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>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
screenshot: localhost:screenshot
Solution
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>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>Answered By - Tony
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