<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head th:fragment="header">
    <meta charset="UTF-8"></meta>
    <title>index</title>
    <link rel='stylesheet' href='/webjars/bootstrap/3.3.0/css/bootstrap.min.css'></link>
    <link rel='stylesheet' href='/css/site.css'></link>
    <script src="http://cdn.jsdelivr.net/webjars/jquery/3.2.1/jquery.js"
        th:src="@{/webjars/jquery/3.2.1/jquery.min.js}" type="text/javascript"></script>
    <script src="http://cdn.jsdelivr.net/webjars/bootstrap/3.3.0/js/bootstrap.min.js"
        th:src="@{/webjars/bootstrap/3.3.0/js/bootstrap.min.js}"></script>

    
</head>
<body th:fragment="body">
</body>
</html>

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head th:fragment="header">
    <meta charset="UTF-8" />
    <title>index</title>
    <link rel="stylesheet" th:href="@{/webjars/bootstrap/css/bootstrap.min.css}" />
    <link rel="stylesheet" th:href="@{/css/site.css}" />
    <script type="text/javascript" th:src="@{/webjars/jquery/jquery.min.js}"></script>
    <script type="text/javascript" th:src="@{/webjars/bootstrap/js/bootstrap.min.js}"></script>


</head>
<body th:fragment="body">
</body>
</html>

Use webjar paths for Bootstrap and jQuery as well.
Use webjar paths for Bootstrap and jQuery as well.
