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View Marcin Sodkiewicz’s profile on LinkedIn, the world's largest professional community. Building Asynchronous RESTful Services With Jersey. Marcin Sodkiewicz. Software Engineer w. Building RESTful Web Services with Java EE 8 is a comprehensive guide that will show you how to develop state-of-the-art RESTful web services with the latest Java EE 8 APIs. You will begin with an overview of Java EE 8 and the latest API additions and improvements.
RESTful Service : Representational State Transfer (REST) has gained widespread acceptance across the Web as a simpler alternative to SOAP and Web Services Description Language (WSDL) based Web services.
REST defines a set of architectural principles by which you can design Web services that focus on a system’s resources, including how resource states are addressed and transferred over HTTP by a wide range of clients written in different languages. If measured by the number of Web services that use it, REST has emerged in the last few years alone as a predominant Web service design model. In fact, REST has had such a large impact on the Web that it has mostly displaced SOAP- and WSDL-based interface design because it’s a considerably simpler style to use.
RESTFul Vs. SOAP Tutorial.
JAX-RS:
Java API for RESTful Web Services (JAX-RS), is a set if APIs to developer REST service. JAX-RS is part of the Java EE6, and make developers to develop REST web application easily.
Jersey:
Jersey is the open source, production quality, JAX-RS (JSR 311) Reference Implementation for building RESTful Web services. But, it is also more than the Reference Implementation. Jersey provides an API so that developers may extend Jersey to suit their needs.
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Let’s start building simple
RESTful API with below steps:
Step-1
In Eclipse => File => New => Dynamic Web Project. Name it as “
CrunchifyRESTJerseyExample “.
Make sure you set:
Step-2
If you don’t see
web.xml (deployment descriptor) then follow these steps. OR
This will create
web.xml file under /WebContent/WEB-INF/ folder.
Step-3
Now convert Project to
Maven Project so we could add required .jar files as dependencies.
Steps:
Just click on
Finish button without making any changes.
Step-4
Open
pom.xml file and add below dependencies.
Here is my
pom.xml file.
pom.xml
Step-5
Update your web.xml file with this one. Here is my
web.xml file copy:
web.xml
Step-6
CtoFService.java
CtoFService.java
Step-7
Same way create FtoCService.java
FtoCService.java
FtoCService.java
Step-8
Now let’s clean eclipse workspace and build project.
Pluralsight Building Asynchronous Restful Services With Jersey ShoreStep-9
Deploy project
CrunchifyRESTJerseyExample on Tomcat. Here are detailed steps on how to setup Tomcat on Eclipse if you haven’t done so.
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Step-10
Complete project structure:Here are Java Build Path Dependencies:
Make sure you use JDK 1.8 for this project. Starting Java 9 – JAXB, JAX-WS, JAF, JTA, CORBA modules are removed and you need to add those modules manually to your Maven pom.xml file.
All set. Now let’s test you RESTful Web Service.Test 1: Celsius to Fahrenheit web service
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SEVERE:Servlet[Jersey Web Application]inweb application[/CrunchifyRESTJerseyExample]threw load()exception
java.lang.ClassNotFoundException:com.sun.jersey.spi.container.servlet.ServletContainer
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1328)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:542)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:523)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1032)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:971)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4829)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5143)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1432)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1422)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:944)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1432)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1422)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:944)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:261)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:801)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:695)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)
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If you are getting above error then try adding below maven dependency into your pom.xml file
pom.xml
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4
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<groupId>org.glassfish.jersey.core</groupId>
<version>2.27</version>
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Active1 year, 9 months ago
Reading RESTful documentation, it does not seem like it is possible to implement an asynchronous instance, but someone may know better on SO.
What I mean here is I would like to execute service requests asynchronously:
Pluralsight Building Asynchronous Restful Services With Jersey City
I know
asyncSupported
is not defined in @Path
, but I am looking for something similar to @WebServlet
. Then, I would like to use AsyncContext
instances (or anything equivalent).
Is this possible?
Brian Kelly
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Jérôme VerstryngeJérôme Verstrynge
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6 Answers
RestEasy has some support1 for it - using a custom annotation called
@Suspend
.
See here:http://docs.jboss.org/resteasy/docs/2.2.1.GA/userguide/html/Asynchronous_HTTP_Request_Processing.html
There is also a framework/library on top of Jersey called Atmosphere however that might be overkill for your usecase as its focus appears to be on long-polling client/server web applications ( e.g. chats - https://github.com/Atmosphere/atmosphere )
Pluralsight Building Asynchronous Restful Services With Jerseys
[1] The CDI scope for your request will be lost in in the thread that actually executes the logic. See the RESTEasy-682 issue for more information. This is a problem that hasn't been solved by any REST frameworks that I know of at this moment[March 2014].
Marco
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Eike DEike D
It's apparently possible with CXF and Jetty Continuations but that only appears to be possible with Jetty 6; they've been changed in Jetty 7 to something that's in the Servlet 3.0 spec and I don't know if that's supported by CXF. Moreover, Jetty Continuations seem to be a bit of a messy API, with a lot of manual stuff so I don't know how easy it is to convert the code.
Still, somewhat possible it seems. With a following breeze and when God wills it.
Community♦
Donal FellowsDonal Fellows
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Restful spesification is still at early ages of its life. But this problem should be considered as 2 part. Client and Server.
Client:
For the client side recent changes at last year became mature enough. And recently a non blocking client from based on Jeanfrancois Arcand was implemented and pushed to repository. Idm crack. There is an explanation here.
Server:
Pluralsight - Building Asynchronous Restful Services With Jersey
For the server side, it is still immature. The adoption of the new servlet specification is quite slow and as a developer I am expecting JSR 339 to address these issues as well. And this is also addressed at the JSR spec clearly with these sentences.
JAX-RS 1.1 defines a synchronous request response model on the server side. This JSR will specify a simple asynchronous request processing model such that a response can be returned asynchronous to the request. Servlet 3.0 can be leveraged to enable such support but implementations may choose to use other container-specific APIs instead.
However there are other alternatives too. Projects such as Jetty are addressing such kind of problems elegant as in this example. I can only suggest you to consider other alternatives as the community is growing.
CemoCemo
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Now you can make Asynchoronous RESTful calls using JAX-RS 2.0 API which is part of the recently released Java EE 7.0
V.VidyasagarV.Vidyasagar
Check out Pubsubhubbub found here for an example of a REST-based asynchronous protocol. It is based on the Atom Syndication format and is a lot simplier than WS-* pub/sub mechanisms.
Tommy Grovnes
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Shawn HShawn H
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You may also want to try Spring Webflux which is async and reactive at the same time. However, this is not a JAX-RS implementation from Java EE.
Piotr GwiazdaPiotr Gwiazda
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