No Idea why : The ResourceConfig instance does not contain any root resource classes [duplicate]

Answer 1

The error:

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

means that Jersey can't find service classes. That can be caused by a wrongly named package for the com.sun.jersey.config.property.packages parameter or if the package name is correct but it does not contain resource classes (people sometimes forget to add the @Path annotation on the class).

But I can't find anything wrong with your setup. So this should work!

Check that your application deployed correctly and that your WEB-INF/classes folder actually contains your class with the proper folder path for the package.

Do a full clean and rebuild then try again.

Answer 2

I just ran into this problem using Grizzly with jersey.

When you fire up a a Grizzly container you have to pass in a map telling Grizzly where to find your resources. If you created your project from an archetype like I did or just moved some things around you also have to update this value which is easy to overlook.

    final static String YOUR_PACKAGE_NAME_GOES_HERE = "where.ever.your.resource.package.happens.to.be"

    final Map<String, String> initParams = new HashMap<String, String>();

    initParams.put("com.sun.jersey.config.property.packages",
            YOUR_PACKAGE_NAME_GOES_HERE);

    System.out.println("Starting grizzly...");
    SelectorThread threadSelector = GrizzlyWebContainerFactory.create(BASE_URI, initParams);

Answer 3

I do not no the actual problem you are facing. You can dwonload an example https://github.com/kdmalviyan/RestWithJerseyExample.git you have to take following actions after downloading: 1. mvn clean install 2. deploy war to your server 3. access "JerseyExample-0.0.1-SNAPSHOT/rest/hello/hello Kuldeep Singh" on your server

You will get Output like: Jersey say : hello Kuldeep Singh

I suggest you to follow exact steps without any change anything first. If you get correct result then you can modify according to your need. Please make sure if you are renaming package, rename package in web.xml too.