Apache Spark with spring boot freemarker reports 404

I have been developing a recommend system using Apache Spark as data processing engine and Spring-boot for web. So far, I successfully integrated them together,submit my Uber jar via the spark-submit command .

But I found that when I open any URL defined in @controller class ,wanted to see a web page, I get 404 error, while URL defined in @restcontroller class that returns a Json object works fine.

1. I use FreeMarker as template engine.
2. I use spring-boot-starter-FreeMarker as dependency
3. I have configuration of FreeMarker just like a simplest tutorial guide ,made no manual configuration.

I doubt it’s because I launch my app via spark-submit that lead to web container’s malfunction? I want to know if this problem can be solved and how can I solve that. I am posting my project structure and some code below that might help.

Thanks for your attention.

it's my controller

@Controller
public class welcomeConntroller {

@Value("${application.message:Hello World}")
private String message = "Hello World";

@RequestMapping(value = "/test", method = RequestMethod.GET)
public String welcome(Map<String, Object> model) {
    model.put("time", new Date());
    model.put("message", this.message);
    return "heihei";
}}

it's some part of my pom.xml

          <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.11</artifactId>
            <version>2.1.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_2.11</artifactId>
            <version>2.1.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.codehaus.janino</groupId>
                    <artifactId>janino</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.codehaus.janino</groupId>
                    <artifactId>commons-compiler</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>ch.qos.logback</groupId>
                    <artifactId>logback-classic</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-integration</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>

        <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <dependencies>
                    <dependency>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-maven-plugin</artifactId>
                        <version>1.5.2.RELEASE</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <keepDependenciesWithProvidedScope>false</keepDependenciesWithProvidedScope>
                    <createDependencyReducedPom>false</createDependencyReducedPom>
                    <filters>
                        <filter>
                            <artifact>*:*</artifact>
                            <excludes>
                                <exclude>META-INF/*.SF</exclude>
                                <exclude>META-INF/*.DSA</exclude>
                                <exclude>META-INF/*.RSA</exclude>
                            </excludes>
                        </filter>
                    </filters>
                    <transformers>
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                            <resource>META-INF/spring.handlers</resource>
                        </transformer>
                        <transformer
                                implementation="org.springframework.boot.maven.PropertiesMergingResourceTransformer">
                            <resource>META-INF/spring.factories</resource>
                        </transformer>
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                            <resource>META-INF/spring.schemas</resource>
                        </transformer>
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                        <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            <mainClass>com.recommend.PocApplication</mainClass>
                        </transformer>
                    </transformers>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

it's my project structure enter image description here