Making rest call from groovy

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However, one thing that repeatedly popped up was our reliance on cURL for making calls to external APIs - escaping quotes in the wrong place, checking whether the build was running on a Linux or Windows slave, and various others.

If you're just looking for the code, check out this repo. First of all, you'll need Jenkins, naturally. I prefer using Docker for local development, so let's fetch the latest release:.

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Make a directory for the Jenkins home folder, so we can keep our changes on restarts, expose a port for the web interface, and let's get started:. Note : if you intend to use workflow-libs as a git repository, expose the SSHD port you configure in the Jenkins control panel as well as Use docker logs jenkins to check the initial password it sets on startup, log in, and install the recommended plugins, which include all of the Pipeline plugins.

making rest call from groovy

After creating your user account, you should be greeted with a totally empty Jenkins. Restart the docker container just to make sure everything's applied correctly. Read the pipeline docs for more information about this, but basically, we're going to adding some Groovy scripts in here that can be used from Jenkins jobs. See the gradle-related files here for my setup. We're going to be using Jodd as the base HttpClient.

The Jenkins runtime is a harsh and unforgiving land. I couldn't figure out any way around this without an enormous amount of effort, so finding Jodd was a lifesaver. So, here's the thing: Jenkins will allow us to use Grab to install dependencies at runtime, since workflow-libs isn't compiled ahead of time. Howeverit seems that there's a slight issue with trying to test scripts that use Grab with Spock. Considering you'll likely encounter errors within the Jenkins runtime that you can't reproduce locally no matter what see above: that marshalling error is never going to happen on your local machineany tests you write for this stuff are going to be limited in value - that's why we're using a Jenkins instance as our testbed instead.

Anything we add to src is a Library function, while vars are Globals that can be accessed from any Jenkins Pipeline job. Libraries can be any valid Groovy code mostly - nested closures seem to cause endless amounts of grief, including silently failing to execute - your mileage may varybut cannot access the Jenkins DSL - so, if you want to drop to the shell with a Jenkins sh command, that should go into a script in vars.

More information is available here. In particular, check the note about vars loading as singletons, since that can lead to surprising behaviour. Nothing enormously complicated here. Now, how do we actually use these functions?

Well, the filename of anything in vars is available to Pipeline jobs as a step, so we can create a Pipeline job in Jenkins, and enter this script:.

making rest call from groovy

If everything's lined up correctly see Common Errors and Gotchas belowrunning that build should print out a bunch of information from the Studio Ghibli API. Replace and extend as required. If you're reading this far, presumably you're making changes to the Pipeline files since film data isn't all that useful to you, so there's a couple of things you should watch out for:. Jenkins Setup First of all, you'll need Jenkins, naturally. UnsupportedOperationException: Refusing to marshal org.

MethodClosure for security reasons at hudson.

JD Edwards EnterpriseOne Orchestrator - REST API Connection

ConversionException: Could not call groovyx. MethodClosure for security reasons Debugging information message : Could not call groovyx. UnsupportedOperationException cause-message : Refusing to marshal org. MethodClosure for security reasons JsonBuilder Grab "org.REST is a way of thinking, not a protocol or standard. It's a style of designing loosely coupled applications — more often than not, applications oriented for the Web — that rely on named resources rather than messages.

This tutorial guides you step-by-step through the fundamental concepts of REST and building applications with Restlets. You'll learn how to:. When you are done with the tutorial, you will understand the benefits of designing with RESTful principles, and you'll see how the Restlet framework makes it easy.

To get the most from this tutorial, you should be familiar with Java syntax and the basic concepts of object-oriented development on the Java platform. You should also be familiar with Web applications. To follow along and try out the code for this tutorial, you need a working installation of either:.

There are two versions of the source code for this tutorial see Download. Readers with a low-bandwidth connection might prefer to download the Restlet framework, JUnit, XMLUnit, and DbUnit from their respective sites see Related topics and use the Download package version that does not include dependencies.

These requests map quite nicely to standard business-application needs such as create read, update, and delete CRUDas shown in Table By associating requests, which act like verbs, with resources, which act like nouns, you end up with a logical expression of behavior — GET this document and DELETE that record, for example. Roy Fielding, the veritable father of REST, states in his PhD dissertation that REST "emphasizes scalability of component interactions, generality of interfaces, independent deployment of components, and intermediary components to reduce interaction latency, enforce security, and encapsulate legacy systems" see Related topics.

Building RESTful systems isn't difficult, and the systems are highly scalable while also being loosely coupled to the underlying data; they also leverage caching quite nicely. Everything on the Web pages, images, and so on is in essence a resource.

REST's reliance on named resources rather than messages facilitates loose coupling in application design, because it limits the exposure of the underlying technology. This URL represents a resource — an article called "Unambiguously analyzing metrics. Notice that the URL is noun-based. Although you can also imagine associated, verb-based APIs — such as createArticle? In other words, they are not RESTful. The beauty of REST is that resources can be anything, and how they are represented can vary too.

It really doesn't matter. What matters is that a resource is named and that communication with it doesn't affect its state. Not affecting state is important because stateless interactions facilitate scalability. To quote Leonardo da Vinci, "simplicity is the ultimate sophistication. REST leverages the Web's simplicity and thus yields highly scalable, loosely coupled systems that, as it turns out, are simple to build.

As you'll see, the hardest part of building a RESTful application is deciding on the resources you want to expose.Restful Web Service, expose API from your application in a secure, uniform, stateless manner to the calling client.

The calling client can perform predefined operations using the Restful service. This formed the standard of how web services are implemented. Inthe web consortium also released the definition of an additional standard called RESTful. Over the past couple of years, this standard has become quite popular. And is being used by many of the popular websites around the world which include Facebook and Twitter.

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REST is a way to access resources which lie in a particular environment. For example, you could have a server that could be hosting important documents or pictures or videos. All of these are an example of resources. If a client, say a web browser needs any of these resources, it has to send a request to the server to access these resources.

Now REST defines a way on how these resources can be accessed. The key elements of a RESTful implementation are as follows: Resources — The first key element is the resource itself.

Let assume that a web application on a server has records of several employees. Request Verbs - These describe what you want to do with the resource. A browser issues a GET verb to instruct the endpoint it wants to get data. Request Headers — These are additional instructions sent with the request.

These might define the type of response required or the authorization details.

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Request Body - Data is sent with the request. In a POST call, the client actually tells the web service that it wants to add a resource to the server. Hence, the request body would have the details of the resource which is required to be added to the server. Response Body — This is the main body of the response. Response Status codes — These codes are the general codes which are returned along with the response from the web server.

An example is the code which is normally returned if there is no error when returning a response to the client. Let's assume that we have a RESTful web service is defined at the location. Below is what would happen If the respective verbs were sent by the client. Let's say there was an employee record with the employee number of 1. The following actions would have their respective meanings. POST — This would not be applicable since we are fetching data of employee 1 which is already created.

It enables web applications that are built on various programming languages to communicate with each other With the help of Restful services, these web applications can reside on different environments, some could be on Windows, and others could be on Linux. But in the end, no matter what the environment is, the end result should always be the same that they should be able to talk to each other. Restful web services offer this flexibility to applications built on various programming languages and platforms to talk to each other.There are many techniques and frameworks for making micro-services on the JVM today.

Some of them are well known, other less so. In this article I'm going to go through how you can leverage Groovy's expressiveness combined with the robust micro-service framework Ratpack to create services that consumes less resources and contains less boilerplate and annotations.

It is now roughly 6 years since I started exploring what Groovy can do. Since then Groovy has taken huge steps forward along with the JVM platform. Before there was Java 8, Kotlin, Scala and numerous other languages Groovy already had invented most functional paradigms the "new kids on the block" are so touting today. While it was a bit slow still on Java 6, the introduction of invoke-dynamic in the JVM made it super-fast, almost as fast as Java itself making it a 1 language to use on the JVM.

I think Groovy's expressiveness combined with the low gradual learning curve if you are coming from Java makes it a perfect language to use both for configuration Gradle, Jenkins as well as application frameworks Grails, Ratpack.

RESTful Web Services Tutorial with Example

Many programmers today are also getting tired of the annotation hell Java applications are becoming for example with Spring Framework where functionality is hidden behind a black box annotation. Groovy's DSL support provides a nice simple alternative to annotations. Before we can begin, I need to introduce the star of the show, the Ratpack framework.

I have now been using Ratpack for some time and it has started to grow more and more on me, turning out to be a great toolbox for writing Groovy based services. Another strength of it is that it will be very lightweight since it will be running on the lightweight Netty server which is crucial if you are spinning up lots of services. But, instead of you believing melet me show you how to make an app so you can judge for yourself. Since I like to keep examples relevant I will not write a "Hello world!

I will show you how you can set up a in-memory H2 database as well as initialize it using Flyway scripts. Finally I will show you how to package and deploy it with Gradle to Docker. Sounds hard? I assure you if you can write a hello world app you can write what I just described in no time with Ratpack and Groovy. We will start by creating our EP with Ratpack. So I create a new file called Ratpack. This is the main closure for any ratpack application.

All logic to configure the ratpack app goes here. Bindings in Ratpack are the equivalent of dependency injection in other frameworks. What you do is bind an interface or concrete class to an implementation of that class and then in your handlers you can get the implementation by only using the interface.

In Ratpack this can be taken further to have multiple hierarchical registries with multiple implementations, but that is a more advanced topic for later. In our simple application we register two implementations; the H2Module and a anonymous service.

making rest call from groovy

A module in Ratpack is a way to bundle functionality into an easily consumable form by Ratpack applications. Most libraries you see will have a module for you to bind into the project, in our case we are using the H2 module that will allow us to use an in-memory database.

Restful JSON API calls from a Jenkins Pipeline

What the module will do in the background is register a Datasource class with the registry, which we then can use in our handlers to do queries to the database with. We also bind a service to allow us to integrate a non-ratpack dependency into the service life-cycle. In our case we use Flyway to migrate our database tables on application start to our in-memory database defined above.Join the community to find out what other Atlassian users are discussing, debating and creating.

Hello all. I'm trying to call one of REST services from groovy script. I'm doing it this way:. They're in json string. May be i need to change system's groovy encoding? Post a new question. You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in. Also all the application encoding settings are set to UTF-8 and everything is fie if calling rest service via rest client.

You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events. Atlassian Community logo Explore. Create Ask the community. Ask a question Get answers to your question from experts in the community. Start a discussion Share a use case, discuss your favorite features, or get input from the community.

Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. The only library I can find is HttpBuilderis this it? But since this module doesn't appear to be a part of core Groovy I'm not sure if I have the right lib here.

If your needs are simple and you want to avoid adding additional dependencies you may be able to use the getText methods that Groovy adds to the java. URL class:. If you are expecting binary data back there is also similar functionality provided by the newInputStream methods. It is especially useful if you need error handling and generally more functionality than just fetching content with GET. I don't think http-builder is a Groovy module, but rather an external API on top of apache http-client so you do need to import classes and download a bunch of APIs.

You are better using Gradle or Grab to download the jar and dependencies:. Learn more. Ask Question. Asked 5 years, 10 months ago. Active 2 years, 7 months ago. Viewed k times. You might also checkout an updated re version of the HttpBuilder library - http-builder-ng. Active Oldest Votes. Jim Perris Jim Perris 1, 1 1 gold badge 8 8 silver badges 15 15 bronze badges.

Great answer.

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Worked like charm. DLeh The setRequestProperty method does that. I used it in the example to set the Content-Type header. See docs. In pipeline as code, you must do it in shared library otherwise jenkins will forbid it for security reasons, Overriding them is possible but then you may really add vulnerabilities. How to get the response headers? I can't find it out. John Wagenleitner John Wagenleitner How about a post request?

John John 5 5 silver badges 10 10 bronze badges. Brillient idea. Could also use withWriter if you don't want to write a String. Daniel Daniel 4, 3 3 gold badges 36 36 silver badges 61 61 bronze badges. Voted up for the 'note' that was the key. This looks very simple. What's with exception handling and ressource handling? Is there no close and disconnect necessary for the open connection? Is there a simple way to pass the content of a file through the http post outputstream?

HTTPBuilder is it.The canonical reference for building a production grade API with Spring. Since REST-assured uses Groovy under the hood, we actually have the opportunity to use raw Groovy syntax to create more powerful test cases.

This is where the framework really comes to life. For the setup necessary to use REST-assured, check out our previous article. Let's start by taking a quick look at some basic Groovy concepts — with a few simple examples to equip us with just what we need. In this example, we'll just pay attention to methodsclosures and the it implicit variable. Let's first create a Groovy collection of words:.

Let's now create another collection out of the above with words with lengths that exceed four letters:. Here, findAll is a method applied to the collection with a closure applied to the method. The method defines what logic to apply to the collection and the closure gives the method a predicate to customize the logic.

We're telling Groovy to loop through the collection and find all words whose length is greater than four and return the result into a new collection. The implicit variable it holds the current word in the loop.

Finally, there is collectit calls the closure on each item in the collection and returns a new collection with the results of each. Let's create a new collection out of the sizes of each item in the words collection:. We use sumas the name suggests to add up all elements in the collection. We can sum up the items in the sizes collection like so:. And if we want to verify that the odds with a status greater than 1 have prices 1. Since it has more than one item, we obtain a Groovy collection.

We then invoke the findAll method on this collection. The closure predicate tells Groovy to create another collection with JSON objects where status is greater than zero.


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