Posting JSON data with Groovy's HTTPBuilder

Question

I've found this doc on how to post JSON data using HttpBuilder. I'm new to this, but it is very straightforward example and easy to follow. Here is the code, assuming I had imported all required dependencies.

def http = new HTTPBuilder( 'http://example.com/handler.php' )
http.request( POST, JSON ) { req ->
    body = [name:'bob', title:'construction worker']

     response.success = { resp, json ->
        // response handling here
    }
}

Now my problem is, I'm getting an exception of

java.lang.NullPointerException
    at groovyx.net.http.HTTPBuilder$RequestConfigDelegate.setBody(HTTPBuilder.java:1131)

Did I miss something? I'll greatly appreciate any help you can do.

Answer 1

I took a look at HttpBuilder.java:1131, and I'm guessing that the content type encoder that it retrieves in that method is null.

Most of the POST examples here set the requestContentType property in the builder, which is what it looks like the code is using to get that encoder. Try setting it like this:

import groovyx.net.http.ContentType

http.request(POST) {
    uri.path = 'http://example.com/handler.php'
    body = [name: 'bob', title: 'construction worker']
    requestContentType = ContentType.JSON

    response.success = { resp ->
        println "Success! ${resp.status}"
    }

    response.failure = { resp ->
        println "Request failed with status ${resp.status}"
    }
}

Answer 2

I had the same problem a while ago and found a blog that noted the 'requestContentType' should be set before 'body'. Since then, I've added the comment 'Set ConentType before body or risk null pointer' in each of my httpBuilder methods.

Here's the change I would suggest for your code:

import groovyx.net.http.ContentType

http.request(POST) {
    uri.path = 'http://example.com/handler.php'
    // Note: Set ConentType before body or risk null pointer.
    requestContentType = ContentType.JSON
    body = [name: 'bob', title: 'construction worker']

    response.success = { resp ->
        println "Success! ${resp.status}"
    }

    response.failure = { resp ->
        println "Request failed with status ${resp.status}"
    }
}

Cheers!