deploying rest api war and starting with App Manager produces error FAIL - Application at context path - spring

Question

First time working with web apps and created a simple springboot rest api and it worked fine locally. Deployed the war to a tomcat server by copying the war file into the /webapps/ directory and restarted tomcat.
I checked if this was successful by opening the tomcat web application manager page and can see the app listed:
http://1xx.xxx.xxx.xxx:8080/manager/
When I click start to get it running the following error appears:
FAIL - Application at context path [/first_restapi] could not be started
I searched around and most answers suggest ensuring all pom file dependencies are included and to check the logs. I checked the logs on the tomcat server and the following error stuck out:
Exception sending context initialized event to listener instance of class
[org.springframework.web.context.ContextLoaderListener]
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem:
Unable to locate Spring NamespaceHandler for XML schema namespace
[http://www.springframework.org/schema/security]
Offending resource: ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]
I did not include a servlet-context.xml file as the tutorial did not show that. But I added it anyway and still got the same error. Can anyone help with this issue?
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:security="http://www.springframework.org/schema/security"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-
beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-3.2.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<!-- DispatcherServlet Context: defines this servlet's request-processing
infrastructure -->
<!-- Enables the Spring MVC #Controller programming model -->
<annotation-driven />
<security:http auto-config="true" create-session="stateless">
<security:intercept-url pattern="/**" access="ROLE_USER"
requires-channel="http"/>
<security:http-basic />
</security:http>
</beans:beans>

Answer 1

You have a dependency problem. For each XML namespace that you (effectively) use in your configuration file, you need the appropriate NamespaceHandler. So in your case, to use the:
beans or util namespace you need spring-beans.jar,
context or task namespace you need spring-context.jar,
mvc namespace you need spring-webmvc.jar,
security namespace you need spring-security-config.jar.
You certainly don't have the last one dependency.