Eclipse中Tomcat Web应用无法自动重载问题求助

我基于Tomcat创建了一个简单Web应用，通过tomcat7-maven-plugin内置容器运行。应用可正常启动，但存在代码修改后无法自动重载的问题：

• 修改LoginServlet.java的URL映射为/login.do1并保存后，控制台抛出异常
• 撤销修改回/login.do并保存后，控制台无任何反应

已在pom.xml中设置contextReloadable=true，尝试更新Maven项目也未解决问题。

相关代码 #

LoginServlet.java #

@WebServlet(urlPatterns = "/login.do")
public class LoginServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, 
    HttpServletResponse response) throws IOException, 
    ServletException 
    {
        request.getRequestDispatcher("/WEB-INF/views/login.jsp").forward(request, response);
    }
}

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/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.in28minutes</groupId>
    <artifactId>in28Minutes-first-webapp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

     <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>
     </dependencies>

     <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.2</version>
                    <configuration>
                        <verbose>true</verbose>
                        <source>1.8</source>
                        <target>1.8</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>
         </pluginManagement>
      </build>
</project>

相关截图 #

• 应用正常运行截图
• 修改URL后的异常截图1
• 修改URL后的异常截图2

内容的提问来源于stack exchange，提问作者OliI