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- Pluralsight Building Asynchronous Restful Services With Jerseys
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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:
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 Kelly16.4k44 gold badges4242 silver badges5252 bronze badges
Jérôme VerstryngeJérôme Verstrynge29.9k6969 gold badges233233 silver badges399399 bronze badges
6 Answers
Pluralsight Building Asynchronous Restful Services With Jersey City
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 )
[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].
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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.
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Donal FellowsDonal Fellows107k1616 gold badges118118 silver badges182182 bronze badges
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. There is an explanation here.
Server: Offline split screen ps3 games.
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.
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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.
Pluralsight Building Asynchronous Restful Services With Jerseys
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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.
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Not the answer you're looking for? Browse other questions tagged javaweb-servicesrestasynchronousjax-rs or ask your own question.
Do you have one of the below query/question?
- Write a java REST service to convert Fahrenheit to Celsius and Celcius to Fahrenheit
- REST with Java (JAX-RS) using Jersey
- Conversion from Fahrenheit to Celsius Method in Java
- Homework help w/ conversion of degrees(CtoF, FtoC)
- Java API for RESTful Web Services
- web services – Which is the best Java REST API?
- REST API for Java?
- ctof and ftoc tutorial. ctof and ftoc Java Tutorial
- Create RESTful Web services with Java technology
- RESTful web API framework for Java
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.
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:
- Target runtime: Apache Tomcat v9.0
- Dynamic web module version: 4.0
Step-2
If you don’t see
web.xml
(deployment descriptor) then follow these steps. OR- Right click on project
- Select
Java EE Tools
- Click on
Generate Deployment Descriptor Stub
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:
- Right click on project
- Click on
Configure
- Select option
Convert to Maven Project
.
Just click on
Finish button
without making any changes.Step-4
Open
pom.xml
file and add below dependencies.- asm.jar
- jersey-bundle.jar
- json.jar
- jersey-server.jar
Here is my
pom.xml
file.pom.xml
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 | <project xmlns='http://maven.apache.org/POM/4.0.0'xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'> <groupId>CrunchifyRESTJerseyExample</groupId> <artifactId>CrunchifyRESTJerseyExample</artifactId> <packaging>war</packaging> <sourceDirectory>src</sourceDirectory> <plugin> <version>3.7.0</version> <source>1.7</source> </configuration> </plugins> <dependencies> <groupId>asm</groupId> <version>3.3.1</version> <dependency> <artifactId>jersey-bundle</artifactId> </dependency> <groupId>org.json</groupId> <version>20170516</version> <dependency> <artifactId>jersey-server</artifactId> </dependency> <groupId>com.sun.jersey</groupId> <version>1.19.4</version> </dependencies> |
Step-5
Update your web.xml file with this one. Here is my
web.xml
file copy:web.xml
2 4 6 8 10 12 14 16 18 20 22 24 | <web-app xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://java.sun.com/xml/ns/javaee'xmlns:web='http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd' xsi:schemaLocation='http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd' <display-name>CrunchifyRESTJerseyExample</display-name> <welcome-file>index.html</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.htm</welcome-file> </welcome-file-list> <servlet> <servlet-name>Jersey Web Application</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> </servlet> <servlet-name>Jersey Web Application</servlet-name> </servlet-mapping> |
Step-6
- Go to
Java Resources
- Click on src
- Right click -> New -> Class
- Package: com.crunchify.restjersey
- Name: CtoFService
CtoFService.java
CtoFService.java
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 | * @author Crunchify.com * * Description: This program converts unit from Centigrade to Fahrenheit. */ import javax.ws.rs.GET; import javax.ws.rs.PathParam; publicclassCtoFService{ @Produces('application/xml') Doublecelsius=36.8; Stringresult='@Produces('application/xml') Output: nnC to F Converter Output: nn'+fahrenheit; return'<ctofservice>'+'<celsius>'+celsius+'</celsius>'+'<ctofoutput>'+result+'</ctofoutput>'+'</ctofservice>'; @GET publicStringconvertCtoFfromInput(@PathParam('c')Doublec){ Doublecelsius=c; Stringresult='@Produces('application/xml') Output: nnC to F Converter Output: nn'+fahrenheit; return'<ctofservice>'+'<celsius>'+celsius+'</celsius>'+'<ctofoutput>'+result+'</ctofoutput>'+'</ctofservice>'; } |
Step-7
Same way create FtoCService.java
FtoCService.java
FtoCService.java
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 | * @author Crunchify, LLC * Description: This program converts unit from Fahrenheit to Centigrade. */ import javax.ws.rs.GET; import javax.ws.rs.PathParam; import javax.ws.rs.core.Response; import org.json.JSONObject; @Path('/ftocservice') @Produces('application/json') Doublefahrenheit=98.24; celsius=(fahrenheit-32)*5/9; jsonObject.put('C Value',celsius); Stringresult='@Produces('application/json') Output: nnF to C Converter Output: nn'+jsonObject; returnResponse.status(200).entity(result).build(); @GET publicResponse convertFtoCfromInput(@PathParam('f')floatf)throwsJSONException{ JSONObject jsonObject=newJSONObject(); celsius=(f-32)*5/9; jsonObject.put('C Value',celsius); Stringresult='@Produces('application/json') Output: nnF to C Converter Output: nn'+jsonObject; returnResponse.status(200).entity(result).build(); } |
Step-8
Now let’s clean eclipse workspace and build project.
2 | 2.Project->Right click->Maven->Update Project 3.Project->Right click->Run As..->Maven Build(option5)->Add'clean install'->Run |
- For
point 3
above usethese screenshots
: Maven Build, clean install. - You should see build success message.
Step-9
Deploy project
CrunchifyRESTJerseyExample
on Tomcat. Here are detailed steps on how to setup Tomcat on Eclipse if you haven’t done so.- Go to Server Tab
- Right click on Server
- Click on
Add and Remove Projects
- Selection project from left side and click on
Add
- Click finish
Step-10
- Start Tomcat Server 9.0
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 without
parameter
Test 2: Celsius to Fahrenheit web service with
parameter
Test 3:Fahrenheit to Celsius web service without
parameter
Test 4:Fahrenheit to Celsius web service with
parameter
RESTFul Client Examples:
Another must read:
Having trouble running code? Some triage steps:
Initially I used
jersey-core
dependency. But added jersey-server
dependency too to avoid below issue.If this error
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 | 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) |
If you are getting above error then try adding below maven dependency into your pom.xml file
pom.xml
2 4 | <groupId>org.glassfish.jersey.core</groupId> <version>2.27</version> |
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