A Not acceptable Rest with Spring

Trying to come up with a clever title for a blog post is not easy.

This problem caused me headaches for 2 days and as much as I have resolved it I have no idea why and how it happened.

I have done REST application with Spring many times in the past and it easy. At one point in the process for this one I was creating REST application with STS just to confirm that it was a no brainer, which helped and puzzled me.

The simplest class that worked for me was something like this:

@Controller
@RequestMapping(value="/rest")
public class Rest {
    @RequestMapping(value="/{something}", method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody
    public String[] firstTry(@PathVariable String something){
        return new String[]{something, "testValue"};
    }
}

I could quickly package it with Maven and run it on Wildfly and it would work as expected.

When I tried to do the same in IntelliJ I was getting a non working application that returned a 406, Not Acceptable, return code to all REST calls.

I compared the web.xml, the application context xml files, the pom files, everything I could thing of and the STS app would work with nothing special but the IntelliJ app would not.

Most articles I was finding were talking about bugs in some version of Spring and to make sure you had the element in your application context xml. I tried many version and adding the annotation driven did not fix the issue.

I finally found this article that explained that you needed to make sure you specified the jackson-databind library in your pom.xml otherwise you would get 406 answers. Once I added the jackson libraries to my project from IntelliJ I was able to get things to work as expected.

No Jackson libraries are specified in my STS generated project and they work so I am still puzzled as to why this was needed in the IntelliJ project.

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Published by

m5c

Java developper that loves photography and good coffee

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