I'm starting to study in AngularJs at the beginning level. My project is used in the Spring Boot framework. I get an error message: "ReferenceError: angular is not defined". I have already created app.js which is a defined angular variable, but it is still an error.
app.js:
var app = angular.module('myapp', ['ngRoute']);
app.controller('mainController', ['$scope', function($scope) {
$scope.title = "Welcome";
}]);
welcome.jsp:
<c:set var="contextPath" value="${pageContext.request.contextPath}"/>
<!DOCTYPE html>
<html ng-app="myapp" lang="en">
<head>
<meta charset="utf-8">
<title>Create an account</title>
<link href="${contextPath}/resources/css/bootstrap.min.css" rel="stylesheet">
<script src="${contextPath}/resources/js/app.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.9/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.9/angular-route.min.js"></script>
</head>
<body>
<div class="container" ng-controller="mainController">
<c:if test="${pageContext.request.userPrincipal.name != null}">
<form id="logoutForm" method="POST" action="${contextPath}/logout">
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
</form>
<h2> {{ title }} ${pageContext.request.userPrincipal.name} |
<a onclick="document.forms['logoutForm'].submit()">Logout</a></h2>
</c:if>
{{ title }}
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="${contextPath}/resources/js/bootstrap.min.js"></script>
</body>
</html>
How can I resolve this issue?