Spring boot application won't run when trying to run from the jar file

Question

I have a spring boot application which works fine when run through intellij. But when I run it from the jar I am getting the below exception.

        2017-02         


        

Answer 1

To add onto @Bampfer's answer since Googleing brought me here. This is a way to not have to unpack your resources in a separate module and have dynamic component scanning.

Create an custom annotation @JaxRsResource that you put on any resource class.

public @interface JaxRsResource {
}

@Named
@JaxRsResource
@Path("/my/api/path")
public class MyResource {
    @GET
    public String helloWorld() { return "Hello World"; }
}

I then utilized spring's component scanning api from this post: Scanning Java annotations at runtime and registered the components I found with my custom annotation and called the register function.

@Configuration
public class JaxrsApplication extends ResourceConfig {

    private final Logger logger = LoggerFactory.getLogger(JaxrsApplication.class);

    public JaxrsApplication() {

        final ClassPathScanningCandidateComponentProvider scanner =
                new ClassPathScanningCandidateComponentProvider(false);

        scanner.addIncludeFilter(new AnnotationTypeFilter(JaxRsResource.class));

        for (final BeanDefinition resourceBean : scanner.findCandidateComponents("my.base.package")) {
                try {
                    final Class resourceClass = getClass().getClassLoader().loadClass(resourceBean.getBeanClassName());
                    register(resourceClass);
                } catch (final ClassNotFoundException e) {
                    logger.error(String.format("Unable to load Jax-RS resource {}.", resourceBean.getBeanClassName()), e);
                }
            }
        }
    }
}

Note: You have to load the class from the class loader and pass the Class object to register(). If you only pass the class name as a string to the register method it won't load the resource.