How to install and use httpbuilder plugin in grails

Question

How to install and use httpbuilder plugin in Grails?

There's no plugin named "httpbuilder". There's a [REST Client](http://www.grails.org/plugin/rest) plugin, though. Was there something unclear about its installation or usage in the [documentation](http://www.grails.org/plugin/rest)? Your question is rather broad. — Rob Hruska, Sep 11 '11 at 16:15

score 28 · Answer 1 · answered Sep 11 '11 at 16:47

Adding httpbuilder 0.5.1 to your application dependencies will cause errors. In particular, you'll get an error something like this:

java.lang.LinkageError: loader constraint violation: when resolving overridden method "org.apache.xerces.jaxp.SAXParserImpl.getParser()Lorg/xml/sax/Parser;" the class loader (instance of org/codehaus/groovy/grails/cli/support/GrailsRootLoader) of the current class, org/apache/xerces/jaxp/SAXParserImpl, and its superclass loader (instance of <bootloader>), have different Class objects for the type org/xml/sax/Parser used in the signature

I think the issue is that httpbuilder is exporting it's compile-time dependencies as runtime dependencies. An easy workaround is to declare the dependency like this in your BuildConfig.groovy:

grails.project.dependency.resolution = {
    ...
    dependencies {
        runtime('org.codehaus.groovy.modules.http-builder:http-builder:0.5.1') {
            excludes 'xalan'
            excludes 'xml-apis'
            excludes 'groovy'
        }
    }
}

I think you need mavenRepo "http://repository.codehaus.org" in the repositories section as well.

You rock ataylor! Solved my afternoon – Sergio del Amo Jun 17 '12 at 15:49 — Sergio del Amo, Jun 17 '12 at 15:49
Codehaus is now dead. Hence this answer needs updating – rahulserver Jan 04 '17 at 16:05 — rahulserver, Jan 04 '17 at 16:05

Rob Hruska · Accepted Answer · 2011-09-11T16:23:35.857

5

There is the REST Client plugin:

Installation:
```
grails install-plugin rest
```

Example:

withHttp(uri: "http://www.google.com") {
   def html = get(path : '/search', query : [q:'Groovy'])
   assert html.HEAD.size() == 1
   assert html.BODY.size() == 1
}

edited Sep 11 '11 at 16:23

answered Sep 11 '11 at 16:17

Rob Hruska

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How do I do a post and not get? – user903772 Sep 11 '11 at 17:29
4

I haven't read the docs or ever used this plugin, but my uneducated guess would be to replace `get` with `post` – Dónal Sep 12 '11 at 14:33
Note that as of 2.3, `install-plugin can no longer be used to install plugins`. I'm still trying to figure out this one now, and I really miss node/npm :( – Mark K Cowan Jul 03 '14 at 19:41

V H · Answer 3 · 2013-12-30T15:33:22.067

0

I ended up using the above step by ataylor but then commented out the block and tested plugin:

compile ":rest:0.7"

Rest plugin uses http-builder and without having the above dependancy my app still works fine and makes calls through http builder.

edited Dec 30 '13 at 15:33

answered Sep 30 '13 at 16:06

V H

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How to install and use httpbuilder plugin in grails

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