I'm creating a maven project and I'm a beginner..I got this error. can help to resolve this is my pom.xml & web.xml

Question

http://maven.apache.org/maven-v4_0_0.xsd"> 4.0.0 com.project Online_Medical_Reporting_System war 0.0.1-SNAPSHOT Online_Medical_Reporting_System Maven Webapp http://maven.apache.org junit junit 3.8.1 test org.hibernate.javax.persistence hibernate-jpa-2.1-api 1.0.0.Final org.hibernate hibernate-validator 4.0.2.GA org.hibernate hibernate-core 3.3.2.GA org.springframework spring-aop 4.1.6.RELEASE

    <!-- The spring-webmvc module (also known as the Web-Servlet module) contains 
        Spring’s model-view-controller (MVC) and REST Web Services implementation 
        for web applications -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>

    <!-- The spring-web module provides basic web-oriented integration features 
        such as multipart file upload functionality and the initialization of the 
        IoC container using Servlet listeners and a web-oriented application context -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.2.4.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>4.0.4.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>4.3.0.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.3.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
</dependencies>
<build>
    <finalName>Online_Medical_Reporting_System</finalName>
    <plugins>
        <plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.2</version>
            <configuration>
                <verbose>true</verbose>
                <source>1.7</source>
                <target>1.7</target>
                <showWarnings>true</showWarnings>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <path>/</path>
                <contextReloadable>true</contextReloadable>
            </configuration>
        </plugin>

    </plugins>
</build>

Blockquote

http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> Online_Medical_Reporting_System

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

Answer 1

You're mixing versions of spring dependencies which you should never do unless you have an exceptional reason.

Please see this blog post that details how to and why you shouldn't do this, it's spring boot releated but the idea is the exact same https://spring.io/blog/2016/04/13/overriding-dependency-versions-with-spring-boot

Quick example shown here, http://www.baeldung.com/spring-maven-bom

<dependencyManagement>

<dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-framework-bom</artifactId>
   <version>4.3.12.RELEASE</version>
   <type>pom</type>
   <scope>import</scope>
</dependency>

</dependencyManagement>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
</dependency>

<!-- The spring-web module provides basic web-oriented integration features 
    such as multipart file upload functionality and the initialization of the 
    IoC container using Servlet listeners and a web-oriented application context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-tx</artifactId>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

The dependencies are controlled through the BOM Import. Additionally I believe a lot of what you have defined would be transitively pulled e.g. shouldn't need to define context, beans etc. I'd check your dependency hierarchy and flatten the defined dependencies.