How to pass a value from href in HTML to Thymeleaf? - java

I am trying to get info from a input bar and use the value for a modal. Currently I am using Thymeleaf and I am getting everything mixed up. I tried setting the attribute for href using jQuery. Though I believe since the th:href gets rendered on page load, my code does not work.
The end goal is to send the info from the input field, process it in Thymeleaf, and then show the results in the modal. I can so far only accomplish it when I hard code everything. I am looking for a more dynamic way. Any help will be appreciated.
HTML:
<!DOCTYPE html>
<html xml="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="ISO-8859-1">
<title>Application</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/landing-page.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<ul class="nav nav-tabs ">
<li class="nav-item">
<a class="nav-link active" href="#">Home</a>
</li>
<li class="nav-item">
<!-- <a class="nav-link" href="create.html">Create</a> -->
<a class="nav-link" href="/addTyler">Create</a>
</li>
<li class="nav-item dropdown ml-md-auto">
<a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown">Account</a>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Settings</a>
<div class="dropdown-divider">
</div> <a class="dropdown-item" href="#">Log out</a>
</div>
</li>
</ul>
</div>
</div>
<div class="row">
<div class="col-md-12">
<h3 class="text-center">
Taddm Mapping
</h3>
</div>
</div>
<div class="row" id="search-row">
<div class="col-md-8">
<div class="filter-search">
<input class="form-control" id="myInput" type="text" placeholder="Search..">
<div class="list-group" id="myList">
<div th:each="plants : ${plants}">
</div>
</div>
</div>
</div>
<div class="col-md-4">
<span class="input-group-btn">
<a class="btn btn-primary eBtn">View</a>
<!-- <a th:href="#{findOne/(appcode=01G)}" class="btn btn-primary eBtn">View</a> -->
</span>
</div>
<div class="myForm">
<form th:action="#{/save}" method="POST">
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Update or Create</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="form-group">
<label for="appcode" class="col-form-label">AppCode:</label>
<input type="text" class="form-control" id="appcode" name="appcode" value=""/>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<input type="submit" class="btn btn-primary" value="save"/>
</div>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
</body>
</html>
jQuery:
// Empty JS for your own code to be here
$(document).ready(function() {
$("#myList").toggle();
$("#myInput").on("focus", function() {
$("#myList").toggle();
});
$("#myInput").on("focusout", function() {
// Here, it'll wait 100 miliseconds to hide the list.
setTimeout(function() {
$("#myList").toggle();
}, 250);
});
$("#myInput").on("keyup", function() {
var value = $(this).val().toLowerCase();
$("#myList a").filter(function() {
$(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
});
});
// This is the code to populate the field after selecting an option.
$("#myList a").on("click", function() {
var texto = $(this).text();
$("#myInput").val(texto);
});
$(".eBtn").on("click", function(event){
$("a").attr("href","#{findOne/(appcode='01G')}"); //Test
event.preventDefault();
var href = $(this).attr('href');
console.log(href);
$.get(href, function(appcode,status){
$("#appcode").val(appcode);
});
$("#exampleModal").modal();
});
});
Controller:
#RequestMapping("/findOne")
#ResponseBody
public String findOne(String appcode) {
System.out.println(mAppRepo.findById(appcode).get().getmAppName());
return mAppRepo.findById(appcode).get().getmAppName();
}

Related

I reference my CSS page to my HTML and it simply won't have any effect

I am currently working on a java project and have made an html page with a design (css) page to accompany it. I have referenced it but it still won't have any effect. I hard reloaded the page still no changes. Don't really understand why this is happening. I keep getting "net::ERR_ABORTED 404" on localhost. The stylesheet file name is indeed correct (being loginStyle.css). They are also both located in the same folder. Would appreciate any help. Thanks!
.btn-color {
background-color: #0e1c36;
color: #fff;
}
.profile-image-pic {
height: 200px;
width: 200px;
object-fit: cover;
}
.cardbody-color {
background-color: #ebf2fa;
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<!DOCTYPE html>
<html lang="en" xmlns:thymeleaf.org>
<head>
<link rel="stylesheet" type="text/css" href="loginStyle.css" />
</head>
<div class="container">
<div class="row">
<div class="col-md-6 offset-md-3">
<h2 class="text-center text-dark mt-5">Welcome</h2>
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<form class="card-body cardbody-color p-lg-5" th:action="#{/userLogin}" th:object="${user}" method="post">
<div class="text-center">
<img src="https://cdn.pixabay.com/photo/2016/03/31/19/56/avatar-1295397__340.png" class="img-fluid profile-image-pic img-thumbnail rounded-circle my-3" width="200px" alt="profile">
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<div class="mb-3">
<input type="text" class="form-control" id="Username" aria-describedby="emailHelp" placeholder="User Name" th:field="*{Id}">
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<div class="text-center"><button type="submit" class="btn btn-color px-5 mb-5 w-100">Login</button></div>
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h2 database console in html layout:fragment (Spring Boot + Java)

I'm working on a Spring Boot application. I use main.html as a frame around all the other .htmls embedded. For this I use layout:fragment.
I also have a "DATABASE" menu in my navigaton bar, which points to the H2 database console.
Is it possible to embed this console into the main.html as fragment?
main.html's body:
<body>
<div class="container">
<nav class="navbar navbar-default">
<ul class="nav navbar-nav">
<li>HOME</li>
<li>BLOGS</li>
<li>BLOGGERS</li>
<li sec:authorize="hasRole('ROLE_ADMIN')">ADMIN</li>
<li sec:authorize="hasRole('ROLE_ADMIN')">DATABASE</li>
<li><button id="signup-small-button" class="btn btn-success">SIGN UP</button></li>
</ul>
<div class="navbar-right">
<form sec:authorize="!isAuthenticated()" th:action="#{/loginfailed}" method="post">
<input th:value="${username}" type="text" name="username" placeholder="username" required class="login-input"/>
<input th:value="${password}" type="password" name="password" placeholder="password" required class="login-input"/>
<button type="submit" id="login-button" class="btn btn-success btn-xs">Log in</button>
</form>
<div sec:authorize="isAuthenticated()">
<span th:text="${#authentication.name + ' | '}" class="black"></span>
<form th:action="#{/logout}" method="post" id="logout-button-form">
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</form>
</div>
</div>
</nav>
<div layout:fragment="content"></div>
<footer>
<hr/>
<p id="footer">Made by hazazs (©Copyrighted by hazazs™)</p>
</footer>
</div>
</body>

The solution was a database.html file:
<html layout:decorate="~{layout/main}">
<head>
<title>DATABASE</title>
</head>
<body>
<div layout:fragment="content" class="center">
<iframe src="http://IP:PORT/h2" id="h2-console"></iframe>
</div>
</body>
</html>
And of course a #RequestMapping for "/database" which returns this html.
#RequestMapping(value = "/database", method = RequestMethod.GET)
public String database() {
return "database";
}
application.yaml:
spring:
h2:
console:
enabled: true
path: /h2

Bootstrap styles does't work (no collapse)

The Collapse option doesn't work with my code. I took the example from the Bootstrap web.
https://getbootstrap.com/docs/4.0/examples/album/
I have Java project with this example in the .jsp file 1:1. Everything works, all required .js and .css files are included and when I start the app on my localhost and display source code I am able to open all linked libraries - so I suppose application knows about everything needed.
Could you please help me with the problem?
There are shown all .css and .js files references and project structure in screenshot files. The rest of the code is 1:1 with the example from the web.
I checked other similar topics but there were no satisfying answers.
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="/docs/4.0/assets/img/favicons/favicon.ico">
<title>Album example for Bootstrap</title>
<link rel="canonical" href="https://getbootstrap.com/docs/4.0/examples/album/">
<!-- Bootstrap core CSS -->
<link href="<c:url value="/resources/css/bootstrap.min.css"/>" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="<c:url value="/resources/css/album.css"/>" rel="stylesheet">
</head>
<body>
<header>
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<div class="container">
<div class="row">
<div class="col-sm-8 col-md-7 py-4">
<h4 class="text-white">About</h4>
<p class="text-muted">Add some information about the album below, the author, or any other background context. Make it a few sentences long so folks can pick up some informative tidbits. Then, link them off to some social networking sites or contact information.</p>
</div>
<div class="col-sm-4 offset-md-1 py-4">
<h4 class="text-white">Contact</h4>
<ul class="list-unstyled">
<li>Follow on Twitter</li>
<li>Like on Facebook</li>
<li>Email me</li>
</ul>
</div>
</div>
</div>
</div>
<div class="navbar navbar-dark bg-dark box-shadow">
<div class="container d-flex justify-content-between">
<a href="#" class="navbar-brand d-flex align-items-center">
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="mr-2"><path d="M23 19a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h4l2-3h6l2 3h4a2 2 0 0 1 2 2z"></path><circle cx="12" cy="13" r="4"></circle></svg>
<strong>Album</strong>
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</div>
</header>
<main role="main">
<section class="jumbotron text-center">
<div class="container">
<h1 class="jumbotron-heading">Album example</h1>
<p class="lead text-muted">Something short and leading about the collection below—its contents, the creator, etc. Make it short and sweet, but not too short so folks don't simply skip over it entirely.</p>
<p>
Main call to action
Secondary action
</p>
</div>
</section>
<div class="album py-5 bg-light">
<div class="container">
<div class="row">
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</main>
<footer class="text-muted">
<div class="container">
<p class="float-right">
Back to top
</p>
<p>Album example is © Bootstrap, but please download and customize it for yourself!</p>
<p>New to Bootstrap? Visit the homepage or read our getting started guide.</p>
</div>
</footer>
<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="<c:url value="/resources/js/jquery-3.3.1.slim.min.js"/>" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery-slim.min.js"><\/script>')</script>
<script src="<c:url value="/resources/js/popper.min.js"/>"></script>
<script src="<c:url value="/resources/js/bootstrap.min.js"/>"></script>
<script src="<c:url value="/resources/js/holder.min.js"/>"></script>
</body>
</html>

Dont know about .jsp but when you add CDN, its works fine
I just replaced your link and script file with CDN
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="/docs/4.0/assets/img/favicons/favicon.ico">
<title>Album example for Bootstrap</title>
<link rel="canonical" href="https://getbootstrap.com/docs/4.0/examples/album/">
<!-- Bootstrap core CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
<header>
<div class="collapse bg-dark" id="navbarHeader">
<div class="container">
<div class="row">
<div class="col-sm-8 col-md-7 py-4">
<h4 class="text-white">About</h4>
<p class="text-muted">Add some information about the album below, the author, or any other background context. Make it a few sentences long so folks can pick up some informative tidbits. Then, link them off to some social networking sites or contact information.</p>
</div>
<div class="col-sm-4 offset-md-1 py-4">
<h4 class="text-white">Contact</h4>
<ul class="list-unstyled">
<li>Follow on Twitter</li>
<li>Like on Facebook</li>
<li>Email me</li>
</ul>
</div>
</div>
</div>
</div>
<div class="navbar navbar-dark bg-dark box-shadow">
<div class="container d-flex justify-content-between">
<a href="#" class="navbar-brand d-flex align-items-center">
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="mr-2"><path d="M23 19a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h4l2-3h6l2 3h4a2 2 0 0 1 2 2z"></path><circle cx="12" cy="13" r="4"></circle></svg>
<strong>Album</strong>
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</div>
</header>
<main role="main">
<section class="jumbotron text-center">
<div class="container">
<h1 class="jumbotron-heading">Album example</h1>
<p class="lead text-muted">Something short and leading about the collection below—its contents, the creator, etc. Make it short and sweet, but not too short so folks don't simply skip over it entirely.</p>
<p>
Main call to action
Secondary action
</p>
</div>
</section>
<div class="album py-5 bg-light">
<div class="container">
<div class="row">
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4 box-shadow">
<img class="card-img-top" data-src="holder.js/100px225?theme=thumb&bg=55595c&fg=eceeef&text=Thumbnail" alt="Card image cap">
<div class="card-body">
<p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<div class="d-flex justify-content-between align-items-center">
<div class="btn-group">
<button type="button" class="btn btn-sm btn-outline-secondary">View</button>
<button type="button" class="btn btn-sm btn-outline-secondary">Edit</button>
</div>
<small class="text-muted">9 mins</small>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</main>
<footer class="text-muted">
<div class="container">
<p class="float-right">
Back to top
</p>
<p>Album example is © Bootstrap, but please download and customize it for yourself!</p>
<p>New to Bootstrap? Visit the homepage or read our getting started guide.</p>
</div>
</footer>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
</body>
</html>

button posts to current address

I'm having a problem with form. When I use button it's using post method to current address instead of one specified in form. I got no idea what's wrong in that form. I would really appreciate some help.
<form th:action:="#{/shoppingCart/addItem}" method="post">
<input hidden="hidden" th:value="*{book.id}"/><!--both name and value are taken care of by that syntax -->
<div class="row" style="margin-top: 120px">
<div class="col-xs-3">
<a th:href="#{/bookshelf}">Back to book list. </a><br/>
<img class="img-responsive shelf-book" th:src="#{adminPath}+#{/image/book/}+${book.id}+'.png'"/>
</div>
<div class="col-xs-9">
<h3 th:text="${book.title}">Book Title</h3>
<div class="row">
<div class="col-xs-5">
<h5><strong>Author: </strong><span th:text="${book.author}"></span></h5>
<p><strong>Publisher: </strong><span th:text="${book.publisher}"></span></p>
<p><strong>Publication Date: </strong><span th:text="${book.publicationDate}"></span></p>
<p><strong>Language: </strong><span th:text="${book.language}"></span></p>
<p><strong>Category: </strong><span th:text="${book.category}"></span></p>
<p><strong><span th:text="${book.format}"></span></strong> : <span th:text="${book.numberOfPages}"></span> pages</p>
<p><strong>ISBN: </strong><span th:text="${book.isbn}"></span></p>
<p><strong>Shipping weight: </strong><span th:text="${book.shippingWeight}"></span> kg</p>
</div>
<div class="col-xs-5">
<div class="panel panel-default" >
<div class="panel-body">
<div class="row">
<div class="col-xs-6">
<h4>Our price: <span>$ <span style="color: #db3208;" th:text="${book.ourPrice}"></span></span> </h4>
<p>List price: <span>$ <span style="text-decoration: line-through" th:text="${book.listPrice}"></span></span> </p>
<p>You save: <span th:text="${#numbers.formatDecimal((book.listPrice - book.ourPrice), 0, 'COMMA', 2, 'POINT')}"></span> </p>
<span>Qty: </span>
<select>
<option th:each="qty : ${qtyList}" th:value="${qty}" th:text="${qty}" ></option>
</select>
</div>
<div class="col-xs-6">
<h4 th:if="*{book.inStockNumber>9}" style="color: green">In Stock;</h4>
<h4 th:if="*{book.inStockNumber>0 and book.inStockNumber<10}" style="color: green">Only <span th:text="${book.inStockNumber}"></span> left.</h4>
<h4 th:if="*{book.inStockNumber==0}" style="color: darkred">SOLD OUT.</h4>
<button type="submit" class="btn btn-warning" style="color: black; border: solid 1px">Add to cart</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<hr style="color: black; height: 2px; width: 100%"/>
<p th:utext="${book.description}"></p>
</div>
</form>
Sites html code, after using the button
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="" />
<meta name="author" content="" />
<link rel="icon" href="../../favicon.ico" />
<title>Bookstore</title>
<!--Font Awesome-->
<link rel="stylesheet" href="/lib/components-font-awesome/css/font-awesome.min.css" />
<!-- Bootstrap core CSS -->
<link href="/lib/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet" />
<!-- Custom styles for this template -->
<link href="/css/style.css" rel="stylesheet" />
</head>
<body>
<div>
<div class="page-top" style="width: 100%; height: 20px; background-color: #f46b42; margin-top: -15px"></div>
<!-- Static navbar -->
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Bookstore</a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" href="/bookshelf">Books <span class="caret"></span></a>
<ul class="dropdown-menu">
<li>Browse the bookshelf</li>
<li>Opening hours & directions</li>
<li>FAQ</li>
</ul>
</li>
<form class="navbar-form navbar-left">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search" />
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>SHOPPING CART</li>
<li>MY ACCOUNT</li>
<li></li>
<li></li>
</ul>
</div><!--/.nav-collapse -->
</div><!--/.container-fluid -->
</nav>
</div>
<div class="container">
<hr style="position: absolute; background-color: #333; z-index: -1; height: 6px; width: 100%; margin-top: 100px" />
<div class="row">
<div class="col-xs-8"><h2 class="section-headline"><span>Welcome guest.</span></h2> </div>
<div class="col-xs-4"><img src="/image/logo.png" class="img-responsive" /></div>
</div>
<img src="/image/wood.png" class="img-responsive" style="margin-top: -75px" />
<form th:action:="#{/shoppingCart/addItem}" method="post">
<input hidden="hidden" value="1" /><!--both name and value are taken care of by that syntax -->
<div class="row" style="margin-top: 120px">
<div class="col-xs-3">
Back to book list. <br />
<img class="img-responsive shelf-book" src="http://localhost:8081/adminportal/image/book/1.png" />
</div>
<div class="col-xs-9">
<h3>tre</h3>
<div class="row">
<div class="col-xs-5">
<h5><strong>Author: </strong><span>wss</span></h5>
<p><strong>Publisher: </strong><span>wew</span></p>
<p><strong>Publication Date: </strong><span>5666</span></p>
<p><strong>Language: </strong><span>polish</span></p>
<p><strong>Category: </strong><span>Biography</span></p>
<p><strong><span>Hardcover</span></strong> : <span>66</span> pages</p>
<p><strong>ISBN: </strong><span>667</span></p>
<p><strong>Shipping weight: </strong><span>7.0</span> kg</p>
</div>
<div class="col-xs-5">
<div class="panel panel-default">
<div class="panel-body">
<div class="row">
<div class="col-xs-6">
<h4>Our price: <span>$ <span style="color: #db3208;">10.0</span></span> </h4>
<p>List price: <span>$ <span style="text-decoration: line-through">12.0</span></span> </p>
<p>You save: <span>2.00</span> </p>
<span>Qty: </span>
<select>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
</select>
</div>
<div class="col-xs-6">
<h4 style="color: green">Only <span>8</span> left.</h4>
<button type="submit" class="btn btn-warning" style="color: black; border: solid 1px">Add to cart</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<hr style="color: black; height: 2px; width: 100%" />
<p><p>hhgvhhu</p></p>
</div>
</form>
</div>
<div>
<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="/lib/jquery/dist/jquery.min.js"></script>
<script src="/lib/bootstrap/dist/js/bootstrap.min.js"></script>
</div>
</body>
</html>

Looks like you've got a typo:
th:action:="#{/shoppingCart/addItem}"
:=

JSP null pointer exception cannot be fixed

I have a jsp page that which is used to get data from a user and addthem into a database using a servlet. there is a null exception comes when i try to run the page. but it does not have any error. can somebody help me to figure out what the error is?
error -
type Exception report
messageInternal Server Error
descriptionThe server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.NullPointerException
root cause
java.lang.NullPointerException
my jsp -
<%#page import="java.sql.ResultSet"%>
<%#page import="java.sql.Statement"%>
<%#page import="java.sql.DriverManager"%>
<%#page import="java.util.ArrayList"%>
<%#page import="com.cert.classes.Incident"%>
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Sri Lanka CERT</title>
<link rel="stylesheet" type="text/css" href="bootstrap/css/bootstrap.min.css" />
<link rel="stylesheet" type="text/css" href="font-awesome/css/font-awesome.min.css" />
<link rel="stylesheet" type="text/css" href="css/local.css" />
<script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div id="wrapper">
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
<span class="sr-only"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.html">Sri Lanka CERT</a>
</div>
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav side-nav">
<li><i class="fa fa-bullseye"></i> Dashboard</li>
<li><i class="fa fa-tasks"></i> Search and Update</li>
</ul>
<ul class="nav navbar-nav navbar-right navbar-user">
<li class="dropdown messages-dropdown">
<i class="fa fa-envelope"></i> Messages<b class="caret"></b>
<ul class="dropdown-menu">
<li class="dropdown-header">2 New Messages</li>
<li class="message-preview">
<a href="#">
<span class="avatar"><i class="fa fa-bell"></i></span>
<span class="message">Security alert</span>
</a>
</li>
<li class="divider"></li>
<li class="message-preview">
<a href="#">
<span class="avatar"><i class="fa fa-bell"></i></span>
<span class="message">Security alert</span>
</a>
</li>
<li class="divider"></li>
<li>Go to Inbox <span class="badge"></span></li>
</ul>
</li>
<li class="dropdown user-dropdown">
<i class="fa fa-user"></i><b class="caret"></b>
<ul class="dropdown-menu">
<li><i class="fa fa-gear"></i> Change Password</li>
<li class="divider"></li>
<li><i class="fa fa-power-off"></i> Log Out</li>
</ul>
<li class="divider-vertical"></li>
<li>
<form class="navbar-search">
<input type="text" value=<%=request.getSession().getAttribute("user") %>><br>
</form>
</li>
</li>
</ul>
</div>
</nav>
<div id="page-wrapper">
<div class="row">
<div class="col-lg-6">
<form role="form" action="/addticket" method="post">
<div class="form-group">
<label>First Name</label>
<input class="form-control" name="firstname">
</div>
<div class="form-group">
<label>Last Name</label>
<input class="form-control" name="lastname">
</div>
<div class="form-group">
<label>Phone</label>
<input class="form-control" name="phone">
</div>
<div class="form-group">
<label>Mode</label><br>
<label class="radio-inline">
<input type="radio" name="mode" value="call">
Call
</label>
<label class="radio-inline">
<input type="radio" name="mode" value="email">
Email
</label>
<label class="radio-inline">
<input type="radio" name="mode" value="visit">
Visit
</label>
<label class="radio-inline">
<input type="radio" name="mode" value="other">
Other
</label>
</div>
<div class="form-group">
<label>Status</label><br>
<label class="radio-inline">
<input type="radio" name="status" value="opened">
Opened
</label>
<label class="radio-inline">
<input type="radio" name="status" value="sent">
Document Sent
</label>
<label class="radio-inline">
<input type="radio" name="status" value="submitted">
Document Submitted
</label>
<label class="radio-inline">
<input type="radio" name="status" value="closed" disabled>
Closed
</label>
</div>
<div cla <label>Comment</label>
<textarea name="comment" class="form-control" rows="3"></textarea>
</div>
<input type="hidden" class="form-control" value=<%=request.getSession().getAttribute("user")%> name="handler">
<%
ArrayList<Incident> list1 = (ArrayList<Incident>) getServletContext().getAttribute("main_list");
ArrayList<Incident> list2 = (ArrayList<Incident>) getServletContext().getAttribute("sub_list");
ArrayList<Incident> list3 = (ArrayList<Incident>) getServletContext().getAttribute("incident_list");
%>
</div>
<div class="col-lg-6">
<div class="form-group">
<label>Main Category</label>
<select name="main_category" class="form-control">
<%
for(Incident item : list1){ %>
<option label="<%=item.getType()%>" value="<%=item.getType()%>" >
<%
}
%>
</select>
</div>
<div class="form-group">
<label>Sub Category</label>
<select name="sub_category" class="form-control">
<%
for(Incident item : list2){ %>
<option label="<%=item.getType()%>" value="<%=item.getType()%>" >
<%
}
%>
</select>
</div>
<div class="form-group">
<label>Incident Type</label>
<select name="incident_type" class="form-control">
<%
for(Incident item : list3){ %>
<option label="<%=item.getType()%>" value="<%=item.getType()%>" >
<%
}
%>
</select>
</div>
<div class="form-group has-error">
<label>Target</label>
<input type="text" class="form-control" name="target">
</div>
<div class="form-group has-warning">
<label>Forwarded</label>
<input type="text" class="form-control" name="forwarded">
</div>
<button type="submit" class="btn btn-default">Add Ticket</button>
<button type="reset" class="btn btn-default">Clear</button>
</form>
</div>
</div>
</div>
</div>
</body>
</html>

The issue with this code is
ArrayList<Incident> list1 = (ArrayList<Incident>) getServletContext().getAttribute("main_list");
first checknull condition for this line if(getServletContext().getAttribute("main_list")!=null) and then type cast to ArrayList. if we are getting null value for this line getServletContext().getAttribute("main_list") and you are trying to typecast with ArrayList then you will get Null Pointer excetion only. Please use JSTL tags instead of direct java code placing in jsp...

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