Java RESTful Web Services Tutorial for Beginner with Jersey and Tomcat

[@scientist_nick]

I originally spent more than 24 hours trying to understand REST Web Services with Eclipse Jersey (I work mostly with mobile and web apps as a developer). When I went through your video and your webpage on this, I could replicate everything and understand all of the things you mentioned. You deserve an accolade what can I say, thanks a bunch. I will recommend your video to my colleagues as well which are learning this.

[@CodeJava]

I'm very glad that you found my video helpful. Thanks and come to my channel more often.

[@archana123ist]

Thank you so much! I was stuck with exceptions and your video, helped me a lot and made my program work! Appreciate your efforts!

[@CodeJava]

You're welcome! Glad it helped! Check out more videos here: kzbin.info/aero/PLR2yPNIFMlL90yhBvXzaQWc3ID40tzilk

[@GhanaTableTennis]

Thanks a million for this tutorial. The tools I use are Glassfish 5.0, Java 8, Netbeans 11, and JEE8. Following your tutorial with such a setup works like charm. Thanks for sharing your knowledge.

[@CodeJava]

Glad it helped

[@ruixue6955]

3:36 steps 5:16 convert project to Maven 5:50 add Jersey API 14:52 parameter config for org.glassfish.jersey.servlet.ServletContainer

[@Sirmontmanful]

Great tutorial, man, video is almost 2 years old and it's still relevant

[@CodeJava]

Glad to know that. Happy coding!

[@tausifiqbal9451]

Thank you so much for such great video , finally I created REST Web Services with jersey without any error😊.

[@CodeJava]

Welcome 👍

[@amaryadav8703]

Thank you for this simple and clear tutorial, you are a saviour!

[@CodeJava]

You're welcome!

[@arunprajapati6445]

Thank you for such an explanatory tutorial ! You deserve a big clap .

[@CodeJava]

You are welcome!

[@skhandle123]

Finally got no 404 error after watching your video. Thanks a ton😄

[@CodeJava]

Happy to help

[@carloseduardorodriguezlope3542]

How did you do it? I'm still receiving the 404 error, I follow the example with Netbeans 12.4 using jersey 3.0.2

[@ahmadjk]

Great tutorial, simple and practical. Thanks for the efforts!

[@CodeJava]

You're welcome!

[@HariHaran-wv4pz]

Thank you , such a great video...👌

[@CodeJava]

Glad you liked it!

[@kamilrozwaka5221]

Thanks a lot, your videos saved my life again!

[@CodeJava]

Glad I could help!

[@tsuiben6528]

Thank you for the tutorial.

[@CodeJava]

you're welcome.

[@jinbeanpark9021]

Thanks for sharing the good tutorial video!

[@CodeJava]

Glad it was helpful!

[@fernandolivia1571]

Thank you so much, this tuturial is excellent ...it helped me a lot.

[@CodeJava]

Glad it helped! Also check my playlist for Web Services here: kzbin.info/www/bejne/moHNi6qYg86Veas

[@arulmurugan6878]

Thank you so much for this video

[@christiancamilogutierrezmo3329]

Awesome tutorial!!! It would be great, that you teach how to consume the web service with a web-form...!!! Greetings from Colombia!!!

[@CodeJava]

then you need to use AJAX with Javascript/jQuery. This video will give you some ideas: kzbin.info/www/bejne/bZ6WaWl9eq-EqqM

[@ucmanhpham5647]

From Vietnam with love

[@CodeJava]

Thank you. Enjoy learning & happy coding!

[@yashbansal1548]

Can you please give some insights on what does , , tags signifies and from where do u got their values.

[@CodeJava]

That XML stuff is used to declare a Servlet (Jersey Servlet Container in this case) to intercept the requests to handle incoming connections from the clients. Jersey Servlet Container will identify if the requests are for the RESTful webservices or not, and handle accordingly. You can find the values in the official Jersey document.

[@1995taunus]

Thank you! Great tutorial!

[@CodeJava]

You're very welcome!

[@dickyr4437]

I followed your steps to create the Dynamic Web Project and after I clicked Finish, I got the following error in web.xml: Multiple annotations found at this line: - There is '1' error in 'javaee_7.xsd'. - schema_reference.4: Failed to read schema document 'platform:/plugin/org.eclipse.xsd/cache/www.w3.org/2001/xml.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not . I have the latest versions of Tomcat (10.0.6) and Eclipse (2021-03). I see that my Dynamic Web Module Version is 4.0 (default) whereas yours is 3.0. Can you help resolve the error?

[@CodeJava]

I have not used Tomcat 10. Maybe it is causing the problem?

[@vauvau1823]

Thank you for the dedication to French people i'm from belgium and i'm following your course on udemy. Thanks again. it would be great to make the same e-commerce web application using Spring ,hibernate and if possible create and consume a web service. I would be taker. Merci beaucoup

[@CodeJava]

I'm currently making such a course as you mentioned, with Spring Boot, Thymeleaf, Bootstrap, jQuery and Restful Webservices.

[@vauvau1823]

@@CodeJava Nice!!!!!!!!!!! We are waiting

[@nagitokomaeda3021]

Hello! I am getting "localhost refused to connect" any idea how to fix this? At first it was because port 8080 was in used but I changed that already and I am still not able to connect to the localhost.

[@LonelyAncient]

it's a bit late but for anyone else getting this error, it might be because the port you chose is already in use or because you forgot to start the server after making changes.

[@arulmurugan6878]

please give me spring mav using restful web services complete video sir.

[@GVB438]

how can we use connection pool c3po,bonecp etc with rest api's jersy

[@CodeJava]

check my written tutorial on how to use C3P0 with Hibernate: www.codejava.net/frameworks/hibernate/how-to-use-c3p0-database-connection-pooling-library-with-hibernate-jpa

[@TheMrCalindo]

didn't you say jax-rs in the description not jax-ws ??

[@CodeJava]

this is for JAX-RS (Java RESTful webservices)

[@ansar6662]

Concise👍

[@CodeJava]

thanks for watching.

[@saliqabano8431]

Maven Dependencies are not appearing in my project after configure and convert to maven project can anybody help?

[@CodeJava]

could you open the pom.xml file?

[@case406]

Thank you so much!!

[@CodeJava]

You're welcome!

[@case406]

@@CodeJava Is there some sort of problem if you want to display a mediatype.application_xml because i it gives me the error 500 and I have no clue?

[@CodeJava]

It should give the reason for 500 error. What is it?

[@afomiaterefe2557]

what can i do to solve the problem i got 404 error

[@CodeJava]

check URL mapping, view name, etc. 404 meaning a resource not found - due to typos in URL, name, path, etc.

[@davidwarner2491]

I am getting http status 500 error root cause Java.lang.IllegalArgumentException

[@CodeJava]

that error means one of parameters has invalid value. Please post the full exception stack trace so I can identify the root cause.

[@davidwarner2491]

Can you give me your mail id? I'll mail you.Thanks in advance

[@CodeJava]

please post here. I don't support via email.

[@davidwarner2491]

@@CodeJava ok this is my error, when i go to :localhost:8081/ToAru/rest/start Type Exception Report Message Servlet.init() for servlet [t-shirt] threw exception Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception javax.servlet.ServletException: Servlet.init() for servlet [t-shirt] threw exception org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.base/java.lang.Thread.run(Thread.java:830) Root Cause java.lang.IllegalArgumentException jersey.repackaged.org.objectweb.asm.ClassReader.(ClassReader.java:171) jersey.repackaged.org.objectweb.asm.ClassReader.(ClassReader.java:153) jersey.repackaged.org.objectweb.asm.ClassReader.(ClassReader.java:425) org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener.process(AnnotationAcceptingListener.java:170) org.glassfish.jersey.server.ResourceConfig.scanClasses(ResourceConfig.java:915) org.glassfish.jersey.server.ResourceConfig._getClasses(ResourceConfig.java:869) org.glassfish.jersey.server.ResourceConfig.getClasses(ResourceConfig.java:775) org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.(ResourceConfig.java:1206) org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.(ResourceConfig.java:1178) org.glassfish.jersey.server.ResourceConfig.createRuntimeConfig(ResourceConfig.java:1174) org.glassfish.jersey.server.ApplicationHandler.(ApplicationHandler.java:345) org.glassfish.jersey.servlet.WebComponent.(WebComponent.java:392) org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:177) org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:369) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.base/java.lang.Thread.run(Thread.java:830) Note The full stack trace of the root cause is available in the server logs. //////////////////////////// this is my Touma.java class: package com.rail; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.core.MediaType; @Path("/start") public class Touma { @GET @Produces(MediaType.TEXT_PLAIN) public String getMsg() { return "hello"; } } /////////////////////////////// And this is my web.xml: ToAru t-shirt org.glassfish.jersey.servlet.ServletContainer jersey.config.server.provider.packages com.rail 1 t-shirt /rest/* index.html index.htm index.jsp default.html default.htm default.jsp /////////////////////////////////////////

[@imanfatima682]

Please teach us the same thing on Netbeans Ide plz

[@CodeJava]

Oh, I'll try with NetBeans. but the code is same regardless of IDE.

[@imanfatima682]

@@CodeJava Yah Plz I will wait

[@ggAtr]

It's secure??

[@CodeJava]

No, it's not because no authentication required.

[@konstantine5711]

thanks alot!

[@CodeJava]

You're welcome!

[@nvs4600]

Are you Vietnamese?

[@CodeJava]

absolutely I am

[@nvs4600]

@@CodeJava Can I have a question for you?

[@CodeJava]

sure, feel free to ask.

[@nvs4600]

​@@CodeJava 15:55 Why is param-name like this? I searched for that on Google but I still can't understand it.

[@CodeJava]

@@nvs4600 it is required by Jersey, so it will know where to load webservices classes.

[@khanhduy9540]

Anh học tiếng anh như thế nào vậy ạ

[@CodeJava]

anh có học đâu, nên nghe mới lởm như vậy :)

[@khanhduy9540]

@@CodeJava em cũng muốn nói được như anh vậy ^^

[@saravananmarimuthu6278]

When I implemented the same with Tomcat10/11 is not working as you mentioned. Throws an error with servlet filter issue. Exception jakarta.servlet.ServletException: Error instantiating servlet class [org.glassfish.jersey.servlet.ServletContainer] Root Cause java.lang.NoClassDefFoundError: javax/servlet/Filter can you help me to understand to solve the issue with latest tomcat server with latest EclipseIDE/STS IDE.

[@CodeJava]

Tomcat 10 uses Jakarta Servlet instead of Java Servlet. So you need to change import package from javax.* to jakarta.*

[@huuvan4500]

Nghe a đọc tiếng anh như mấy ông bên Ấn ghê :)))

[@CodeJava]

haha, em có hiểu gì hem?

[@huuvan4500]

@@CodeJava Dạ có a

[@karlaaraujo6077]

Thank you for this tutorial

[@CodeJava]

You're welcome 😊