Problem with Vaadin and Spring without Spring Boot

I have a following start for my Vaadin + Spring project.

The main UI class:

@SpringUI
@Theme("person")
public class PersonUI extends UI {

    @Autowired
    SpringViewProvider viewProvider;

    @WebServlet(value = "/*", asyncSupported = true)
    @VaadinServletConfiguration(productionMode = true, ui = PersonUI.class, heartbeatInterval = 60, resourceCacheTime = 3600, closeIdleSessions = true)
    public static class Servlet extends SpringVaadinServlet {
    }

    @WebListener
    public static class PersonContextLoaderListener extends ContextLoaderListener {
    }

    @Configuration
    @EnableVaadin
    public static class PersonConfiguration {
    }

    @Override
    protected void init(VaadinRequest request) {
    
        VerticalLayout rootLayout = new VerticalLayout();
        HeaderLayout headerLayout = new HeaderLayout();
        rootLayout.addComponents(headerLayout, contentContainer);

        Navigator navigatorLocal = new Navigator(this, contentContainer);
        navigatorLocal.addProvider(viewProvider);
        navigatorLocal.addView("", LoginView.class);
        navigatorLocal.addView(PersonListView.NAME, PersonListView.class);
        setNavigator(navigatorLocal);
    }

and WEB-INF/applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="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-4.1.xsd">

    <bean class="com.mycompany.PersonUI.PersonConfiguration" />
    <context:component-scan base-package="com.mycompany" />
</beans>

and pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany</groupId>
    <artifactId>person</artifactId>
    <packaging>war</packaging>
    <version>1.0.0</version>

    <properties>
        <applicationContextName>person</applicationContextName>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <vaadin.version>7.6.6</vaadin.version>
    </properties>

    <repositories>
        <repository>
            <id>vaadin-addons</id>
            <url>http://maven.vaadin.com/vaadin-addons</url>
        </repository>
    </repositories>

    <dependencies>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.2.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-spring</artifactId>
            <version>1.0.0</version>
        </dependency>

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-server</artifactId>
            <version>${vaadin.version}</version>
        </dependency>

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-client-compiled</artifactId>
            <version>${vaadin.version}</version>
        </dependency>

        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-themes</artifactId>
            <version>${vaadin.version}</version>
        </dependency>

        ...

    </dependencies>

    </build>
            ...
    </build>
</project>

I have no web.xml file.

And the exception is when requesting http://localhost:8080/person/

com.vaadin.server.DefaultErrorHandler doDefault
SEVERE:
java.lang.IllegalStateException: [com.mycompany.PersonUI] is already mapped to the path
        at com.vaadin.spring.server.SpringUIProvider.detectUIs(SpringUIProvider.java:83)

and

WARN:oejs.ServletHandler:qtp1991615833-36:
javax.servlet.ServletException: com.vaadin.server.ServiceException: com.vaadin.server.ServiceException: No UIProvider has been added and there is no "UI" init parameter.
        at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:366)

Vaadin Spring related documentation is not very good, so does anyone have an idea what is the problem?

I found the solution.
I accidently had two applicationContext.xml files in the project.

Can we try without applicationContext.xml as i don't have xml file? I used java configuration.