Spring Boot, Spring MVC webjars dependencies return 404

Question

I can`t join webjars dependencies to my html page in spring mvc. This is my pom.xml

      <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>webjars-locator</artifactId>
        <version>0.3</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-websocket</artifactId>
    </dependency>

    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>sockjs-client</artifactId>
        <version>1.0.2</version>
    </dependency>
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>stomp-websocket</artifactId>
        <version>2.3.3</version>
    </dependency>
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>bootstrap</artifactId>
        <version>3.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>jquery</artifactId>
        <version>3.1.0</version>
    </dependency>

I use webjars-locator, so i dont need to add webjars to resource handlers manually. But when i load my page it returns 404 for each of webjars dependecies.

<script src="/webjars/jquery/jquery.min.js"></script>
<script src="/webjars/sockjs-client/sockjs.min.js"></script>
<script src="/webjars/stomp-websocket/stomp.min.js"></script>

Answer 1

Add this to your configuration and you should be fine.

@Configuration
public class WebConfiguration implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("/webjars/")
                .resourceChain(false);
        registry.setOrder(1);
    }

}

Answer 2

It is also worth to check, if you have dependency-conflicts. In my case I had

    <dependency>
        <groupId>org.webjars</groupId>
        <artifactId>jquery</artifactId>
        <version>3.6.1</version>
    </dependency>
    <dependency>
        <groupId>org.webjars.bower</groupId>
        <artifactId>jquery-treetable</artifactId>
        <version>3.2.0</version>
    </dependency>

jquery-treetable itself depends on

    jquery 3.6.2

so both versions then were added to the libraries.

This leeds to an 404 when running the application.

You can detect this error by adding

            <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-enforcer-plugin</artifactId>
            <version>3.1.0</version>
            <executions>
                <execution>
                    <id>enforce</id>
                    <configuration>
                        <rules>
                            <dependencyConvergence/>
                        </rules>
                    </configuration>
                    <goals>
                        <goal>enforce</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

to your build.