Spring boot webjars: unable to load javascript library through webjar

Question

I have a spring boot (I use Thymeleaf for templating) project where I want to use some jQuery libraries.

Unfortunately, the webjars aren\'t loading at all. I have tr

Answer 1

You are referencing jquery library correctly. Maybe you are missing resource handler configuration.

<mvc:resources mapping="/webjars/**" location="classpath:/META-INF/resources/webjars/"/>

Or if you use JavaConfig

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
  }

}

Webjars documentation

If this will not work, please check if you have webjars on classpath (open your application JAR in 7Zip and check if webjars resources are inside it.)

Answer 2

The webjars dependencies should be available on the spring boot classpath, so you should try referencing the webjars using the src attribute like so:

<script src="webjars/jquery/2.1.4/jquery.min.js" type="text/javascript"></script>
<script src="webjars/jquery-file-upload/9.10.1/jquery.fileupload.min.js"></script>
<link href="webjars/bootstrap/3.3.5/css/bootstrap.min.css"
  rel="stylesheet" media="screen" />
<link href="webjars/jquery-file-upload/9.10.1/jquery.fileupload.css"
  rel="stylesheet" media="screen" />

Answer 3

I ended up doing a mvn clean install (from cmd prompt) to get the target cleaned and all the lib/jars populated correctly. I am using Spring boot with Intelij.

Answer 4

After inspecting the webjar for jquery, I got this working by adding a "dist" subpath.

<script src="webjars/jquery/2.1.4/dist/jquery.min.js" type="text/javascript"></script>

Answer 5

After inspecting the webjars for jquery, I got this working by adding a "THE VERSION OF JQUERY LIBRARY USED IN POM.XML FILE"

<script src = "/webjars/jquery/3.1.0/jquery.min.js"></script>

(in my case I used 3.1.0 version, used that version only that you are using).

Answer 6

Additional answer found on one blog:

When using Spring Framework version 4.2 or higher, it will automatically detect the webjars-locator library on the classpath and use it to automatically resolve the version of any WebJars assets.

In order to enable this feature, we’ll add the webjars-locator library as a dependency of the application:

<dependency>
    <groupId>org.webjars</groupId>
    <artifactId>webjars-locator</artifactId>
    <version>0.30</version>
</dependency>

In this case, we can reference the WebJars assets without using the version; (...)