Spring Boot Quick Start 9 - Starting a Spring Boot application

Access the full course here: javabrains.io/...
Learn how to start a Spring Boot application andn access it!

[@shubhamjindal9214]

For the people who are watching in 2022, I would suggest generate the spring project using the spring initializer (taught in the video -22 of this playlist itself), as the versions of the projects mentioned in the video are outdated and may give you loads of errors when you even simply run the application

[@manishakumari4501]

thank you

[@priyabansal2021]

Thank you

[@nehazafar277]

thank you

[@lucasbritodev255]

Thanks a lot

[@geetanjaligaddam3121]

Use parent 2.4.0

[@denislafauci1756]

Thanks to your tutorias, I finally understood, how does it work Spring Boot. Thank you very for your clear explanation!

[@sathya8242]

Absolutely nice tutorial. just an FYI, If anyone trying in these days(April 2023), just have the 3.0.6 replaced, inorder to avoid seamless running of the application.

[@annkitsingh1646]

its 2.6.1 for me. If it doesn't works for you just make a additonal spring starter project and there pom.xml generated automatically from where you can look which version will work for you.

[@Modern_revolution]

As usual these playlists provide excellent support

[@shaikhasif15752]

Awesome tutorials man.. No one can teach this better than You

[@ARUNABHPRIYADARSHI]

1.5.7.RELEASE clears all the server start errors. this is something you should update even in future

[@DeepsWar]

This comment helped with the startup issue! Thanks much! But is there a way to know which is the latest version. Where can I find that info?

[@suyashgupta3149]

Thanks for this man

[@ARUNABHPRIYADARSHI]

@@suyashgupta3149 my comment was two years ago. wow glad it helped.

[@preetiram5264]

thank a lot for this comment. It helped me too with startup issue.

[@sarath12345ful]

+javabrains Many of you are getting errors. Here's the fix: Kindly delete your .m2/repository folder, close the project, (if possible IDE) and then open it, run the class file. It shall work properly.

[@thrinathsf1280]

You are just awesome bro. Thank you so much...

[@sebastiansony2000]

Awesome! worked for me too!

[@icebergu]

lol i was becoming crazy downloading all the jars cause i receive a different error each time for dependencies :P Thanks a lot

[@mikeahmed7092]

@Sarath Chandra Where exactly to you access your repository Folder? Please Help. Thanks in Advance

[@Zaria_20]

Thanks bro

[@MainakDev]

getting error when I go to run this as shown at 4:44 "Cannot load configuration class: io.javabrains.springbootstarter.CourseApiApp" Solution for people watching in the future: Change spring boot version to 2.1.0 org.springframework.boot spring-boot-starter-parent 2.1.0.RELEASE

[@JeanScuba]

1.5.2.RELEASE clears all the server start errors.

[@ShyamSuthar2204]

Thanks i had same problem updating to 1.5.2 resolved server start error

[@alexandreformagio1909]

I had this problem: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See www.slf4j.org/codes.html#StaticLoggerBinder for further details. Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/joran/JoranConfigurator at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) at java.lang.Class.getConstructor0(Class.java:3075) at java.lang.Class.getConstructor(Class.java:1825) at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:126) at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:117) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationStartedEvent(LoggingApplicationListener.java:225) at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:205) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:121) at org.springframework.boot.context.event.EventPublishingRunListener.started(EventPublishingRunListener.java:63) at org.springframework.boot.SpringApplicationRunListeners.started(SpringApplicationRunListeners.java:48) at org.springframework.boot.SpringApplication.run(SpringApplication.java:304) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) at io.javabrains.springbootstarter.CourseApiApp.main(CourseApiApp.java:10) Caused by: java.lang.ClassNotFoundException: ch.qos.logback.classic.joran.JoranConfigurator at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 17 more Your advice solved my problem. Thanks

[@choonghuh]

Thanks friend!

[@tamimsyedr691]

Awesome. Fixed my issue.

[@harshithasd7623]

Thank you

[@shoppersdream]

I think that you will have to hover over that red sign and then you will see few options. Choose the import option and double click it.It will add an import statement. I hope it works for you. Thanks

[@DialecticalMaterialismRocks]

The Anual update for those if it doesn't work: org.springframework.boot spring-boot-starter-parent 2.3.5.RELEASE Always take the newest version. This seems to work for me.

[@deepankargubba683]

This is the solution to most errors! It really helps.

[@reshmashaik4100]

It works. Thank You!!

[@sujalgera01]

It really helps. Thanks a lot

[@saurabhjoshi8001]

It really worked...thanks buddy😀

[@vijay12376]

I simply loved this quick start tutorial !

[@computerprogrammingwebtech3017]

Spring boot makes it easier to build and run applications. That is why it is better than the Spring which requires much more of boiler plate codes to have your apps running.

[@RudhinMenon]

Thank you so much for taking time and doing this :-) it helped a lot

[@Debjyotimaitra]

used "2.1.1.RELEASE" as the version and it worked

[@jopadjr]

Great tutorial. I will finish all of them. Cheers.

[@adarshregulapati8872]

If you are getting an Error Always use the latest release of Parent version we can get that from mvn repository

[@girisankar]

Thanks JavaBrains Team :)

[@prat-man]

Use 1.X for JDK X

[@cyrelm]

Thanks! Great video.

[@swathisatheesan9840]

Hi am getting the below error while running the application.. main] o.s.boot.SpringApplication : Error handling failed (ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context:org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2e4b8173: startup date [Thu Jan 01 01:00:00 GMT 1970]; root of context hierarchy) 2018-03-21 12:06:16.541 ERROR 1352 --- [ main] o.s.boot.SpringApplication : Application startup failed java.lang.IllegalArgumentException: Sources must not be empty at org.springframework.util.Assert.notEmpty(Assert.java:276) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE] can anyone help?

[@Nightaxeblade]

For some reason, from the previous video, I keep getting error in my intellij when I try to run this. First I'm getting errors in my pom.xml as the parent project is not being found. Now in the CourseApiApp class @SpringBootFramework is not found.

[@femishotunde2264]

Guys just look up the latest release and use that in your parent version. That should solve the issue.

[@adarshregulapati8872]

Thank You ,this Helped me...

[@subhashkunala281]

@@adarshregulapati8872 This helped me, thnk you so much

[@Dante031]

@java brains I know only core java, is this the best way to start directly from springboot. Or there are certain things i need cover before i come here? If yes Please let me know what else i need to learn before springbot.

[@IamRishavDas]

You should learn Working of servlet Https requests Jdbc Jstl MVC Orm Hibernate 😂😂

[@IamRishavDas]

I know I am replying 4 years later 😂

[@hossamaddin7980]

** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package. ========================================================================================== This error is caused because the startup class is built directly under the Java folder. Actually, you need to create a new subfolder under the Java folder and then create the startup class.

[@bnmdevilop]

sir when i run as java application there is an error that localhost:8080 already in use and when i open the link it requires username and password .Is there any solution to this problem?

[@swiss_2k]

Didnt know that the Class where the main method is, should be anyware but not in the default package! /java/otherPackage...

[@vishwachaitanya9221]

i am not able to imporat @SpringBootApplication and SpringBootApplication.Run imports can u pls help me

[@naare20201]

I am getting this error while running the app " No active profile set, falling back to default profiles: default" can you plz help me on this?

[@khuleasmanonke3601]

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 2018-02-20 00:16:19.486 ERROR 2028 --- [ main] o.s.boot.SpringApplication : Application startup failed

[@anordinarydancer]

Did exactly same steps . But it shows "Application startup failed" erroron the console.

[@manishjoshi1296]

Change the version from 1.4.2 to 2.1.3

[@dibyarai9924]

adding following dependency worked for me: javax.xml.bind jaxb-api 2.3.0

[@anantpratapsingh9067]

@@manishjoshi1296 bro ye version hai kiska ide ka spring ka ya fir khuch or hi hai

[@kencykurian9714]

Make sure that the main class is under the same package as mentioned in the pom's groupid

[@pryakks]

not necessary

[@BarotDevaNgJsontech]

Use this Configuration Which is given on docs.spring.io/spring-boot/docs/current/reference/html/getting-started-first-application.html or copy and paste this POM.xml org.springframework.boot spring-boot-starter-parent 2.0.5.RELEASE org.springframework.boot spring-boot-starter-web 1.8

[@ayandutta3207]

Hi Guys, I think my port 8080 is already in use. Can you tell me how to change the default port of Spring Boot integrated Tomcat server? I am getting the below error while trying to run the application:- "The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured."

[@Ark0wski]

change the port with adding a file called application.properties to the resources folder. Inside the file just write: server.port = 8081 or whatever port you need or want.

[@RudhinMenon]

You can add it to the program VM like this : 1. Right click on project. 2. Run as -> Run configurations 3. Under "arguments" tab, type -Dserver.port=, click apply and run your app. :)))

[@kishorsingh4409]

I tried every solution provided on stackoverflow & lot of other sites but this is the only solution that worked. Kudos!! Thanks for the help.

[@xGrofx]

Thank yo Arek :)

[@subasishkar9469]

Followed till now but while running the app now getting few errors and unable to resolve

[@Locuslokalokuza]

Springboot looked like old school compared to playframework, just my opinion

[@KhanekeDiwane]

what is servlet container?

[@arunkasturi7866]

Add 1.5.7.RELEASE in , org.springframework.boot spring-boot-maven-plugin org.apache.tomcat.maven tomcat7-maven-plugin 2.2 Adding these plugins helped and worked for me.

[@venkatk161]

I successfully run the application by having the following versions. org.springframework.boot spring-boot-starter-parent 1.4.2.RELEASE org.springframework.boot spring-boot-starter-web org.springframework spring-core 4.3.5.RELEASE 1.8

[@venkatk161]

you don't need to mention spring-core dependency, if you use 1.5.7.RELEASE for spring-boot-starter-parent

[@monikajha3500]

Worked for me too.. Thanks Venkat K

[@jyotinadda]

Thanks worked for me.

[@danishrockz1]

when I start my app.. then my given SOP gets printed & JVM terminated.. tomcat server is not running.. wt to do ? need to install tomcat plugin separately in my eclipse IDE ???

[@fundooapp8919]

org.springframework.boot spring-boot-starter-parent 2.1.5.RELEASE in this release getting error in pom.xml done with all approch clean install update everything

[@yahiaamr7639]

error in @SpringBootApplication can not import!! although spring Boot was installed !!

[@newperson2187]

I am facing this error java.lang.IllegalStateException: Cannot load configuration class: io.javabrains.springbootstarter.CourseApiApp Please help

[@borakdfg684]

For people who are facing issues, try below. The solution is maintain the current version of spring boot. For me it is 2.4.1 org.springframework.boot spring-boot-starter-parent 2.4.1 The solution was found in comments.

[@ajaydhiman2368]

This basic application is not running. Tomcat didn't start. localhost:8080/hello is not working.Pls suggest

[@sanyamjain9461]

I am trying to do the same code in eclipse and getting exception that classNotFound...plz help Does it really require STS? Plz reply ASAP

[@kiranchandrachintakindi1216]

seeing below error. couldnot get useful resouce on stackoverflow. Any solution for this? org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tomcatEmbeddedServletContainerFactory' defined in class path resource [org/springframework/boot/autoconfigure/web/EmbeddedServletContainerAutoConfiguration$EmbeddedTomcat.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.http.encoding-org.springframework.boot.autoconfigure.web.HttpEncodingProperties': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/xml/bind/ValidationException at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]

[@chidambaramv6695]

I didn't get error page when search localhost 8080 in browser. What should I do. Any one knows please help me

[@KwstasAntoniou1]

hello i am getting that erro : Description Resource Path Location Type Archive for required library: 'C:/Users/cliff/.m2/repository/org/springframework/spring-core/4.3.9.RELEASE/spring-core-4.3.9.RELEASE.jar' in project 'DemoApp' cannot be read or is not a valid ZIP file DemoApp Build path Build Path Problem

[@anujsachan7971]

hello kaushik i changed spring-boot-starter-parent to 1.4.2. release but i am not able to import SpringApplication.run showing me red line.. how to ressolve it ?

[@raziahmad2574]

Change the version of spring boot 1.4.2 to 1.4.3 1.4.3.RELEASE

[@dhiru7853]

thanks mate!

[@himmoroy]

For some reason this won't work with newer versions. Java v. 10 didn't compile at all. Had to downgrade to 1.8. Springframework.boot 2.0.2.RELEASE didn't work either (@SpringBootApplication not found). Downgrading to 1.5.2 resolved problems.

[@pratyushpradhan2612]

thank you very much

[@vk-p]

SpringApplication is not static class.

[@louiseisobelevans]

I got this when running.... it worked until it got to Tomcat loading. I'm on osx java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]] at java.util.concurrent.FutureTask.report(FutureTask.java:122) [na:1.8.0_131] at java.util.concurrent.FutureTask.get(FutureTask.java:192) [na:1.8.0_131]

[@anjusingh1573]

Please upload some videos on websocket programming using Spring Boot Without STOMP and SockJS and Client should be Java not Javascript.

[@rishabh_gour]

guys just google and put the latest version for the parent tag. Currently it is 2.0.2.RELEASE

[@himanshusuman8565]

its not taking "@SpringBootApplication" but @SpringBootConfiguration and this is not working

[@vishwachaitanya9221]

i am also facing this issue can u pls tell me how to resolve this issue

[@hariswaroop3780]

can anyone help me i didnot get port number in output

[@baismail-daily]

Awesomeagain

[@nikhilnagireddy754]

getting this:::::::>>Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.

[@pryakks]

Don't user Default package. Keep your java files into particular package. Default package ignores @SpringBootApplication annotations to load properly all the jar files.

[@DevineIshaq107]

why is your lesson eclipse oriented and not general ??

[@kwoowoo828]

WTF, a one-liner web app. "Hey Siri, create a web app for me" Siri: "Task too complicated to create. Task aborted." "Idiot, go talk to your friend Spring Boot. Remember its Spring Boot and not Spring. You must have been talking to Spring all these while." Siri: "Alright, and task done in 2.535 sec. Spring Boot is my new friend now. Deleting Spring from friend list."

[@anushakota2364]

hi, I had to change version to 1.4.3 in pom.xml to resolve import issues, but now I am getting below exception when i run: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tomcatEmbeddedServletContainerFactory' defined in class path resource [org/springframework/boot/autoconfigure/web/EmbeddedServletContainerAutoConfiguration$EmbeddedTomcat.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.http.encoding-org.springframework.boot.autoconfigure.web.HttpEncodingProperties': Initialization of bean failed; nested exception is javax.validation.ValidationException: Unable to create a Configuration, because no Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath. can someone tell me solution for this?

[@SanketKD400]

Just change your parent version to 1.5.2.RELEASE org.springframework.boot spring-boot-starter-parent 1.5.2.RELEASE

[@sushruthlokam]

Hi Koushik, Am getting below error APPLICATION FAILED TO START *************************** Description: The Bean Validation API is on the classpath but no implementation could be found Action: Add an implementation, such as Hibernate Validator, to the classpath what to do?

[@titokris5162]

Thanks Alex, got it started!!!

[@titokris5162]

@ AlexTatulescu But TomCat didn't start!!

[@devanshgupta3140]

Hi, upon trying to run the java application, I am getting the following error: - Cannot load configuration class: io.javabrains.springbootstarter.CourseApiApp Can someone please help me out here.....

[@devanshgupta3140]

Use parent 2.4.0 Found the SOLUTION thanks to @geetanjaligaddam3121

[@DainiusDainius]

Tried add Spring Boot maven project to STS - errors, to IntelliJ - same shit. Tried to add Spring Boot gradle to IntelliJ - working, to STS - working. Bullshit.

[@thiagosilvafarias1893]

Did anyone get the Warning Message on the console after pressing run? WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/Users/thiagofarias/.m2/repository/org/springframework/spring-core/4.3.13.RELEASE/spring-core-4.3.13.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release

[@purplepidge]

Yes. Did you solve this in the end?

[@thrinathsf1280]

I tried the same but unable to start. Got below exception: java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext ............... ............... Caused by: java.lang.NoClassDefFoundError: com/fasterxml/classmate/TypeResolver I tried by changing different versions and added plugin: spring-boot-maven-plugin but NO use. Can anyone help with this?

[@siddhaarth8843]

try with a valid package for the main class, not the default package, it worked for me.

[@abhisekcrazy]

I am getting this exception and not able to resolve this, tried the same thing what Kaushik said but still facing this Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/core/env/PropertySource at io.javabrains.course.CourseApiApp.main(CourseApiApp.java:10) Caused by: java.lang.ClassNotFoundException: org.springframework.core.env.PropertySource at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 1 more

[@WildGrassWildGoat]

Did you get any solution for this abishek?

[@abhisekcrazy]

Yes, I have upgraded the version to 1.5.2, 1.5.2.RELEASE

[@eimaisklhros]

ApplicationContextException followed by 5-6 more exceptions :( that's sad

[@bhavyasharma7740]

eimaisklhros did you get any resolution

[@ahmadsolehin6237]

thx

[@himanshusuman8565]

its showing "Error: Could not find or load main class spring.api.MainDemo" help plz...

[@TrulyLordOfNothing]

This is due to Maven dependency conflict. Close eclipse > deleting .m2/repository folder where maven dependencies are saved > open project again > update Maven > It should start working.

[@TrulyLordOfNothing]

.m2 is saved in C:\users or just look at the maven dependency folder. Each file shows the location in Project Explorer.

[@ajaydhiman2368]

javaw.exe stops after couple of seconds

[@aboynextgirl549]

Bro I am getting no classdeffounderror while doing like this

[@pryakks]

put your java class inside some package. default package gives noclassfound exception

[@AmitSingh-vl9vw]

Error: Could not find or load main class

[@TrulyLordOfNothing]

This is due to Maven dependency conflict. Close eclipse > deleting .m2/repository folder where maven dependencies are saved > open project again > update Maven > It should start working.

[@TrulyLordOfNothing]

If you are using windows, it is within the C:/Users/User/m2. If its linux, use a search command for 'm2'

[@souravak6982]

2.7.5

[@rashmiranjanbeura4391]

This video is not very helpful, you give a new developer these videos and make him run the project. It will not work

[@SuperGomez97]

Now, I'm a bit late with this comment, but to be fair, but he says in the beginning that a prerequisite for this course is an understanding of JavaEE. To understand JavaEE, one probably has knowledge in standard Java as well. So this course isn't really for beginners :)))))

[@charminarchaupal]

Three errors I was facing 1.) JRE location not properly set 2.) Version for spring boot starter parent needed to be 2.4.1 and 3.) Group I'd specified at the top of pom.xml was not the same as the package name that contained CourseApiApp.java

[@paulfrischknecht3999]

Thanks again. But IMO one-liners are not impressive. Of course everything that someone knows how to code can be done in one line by calling that other person's code...

[@akshaysingh962]

java.lang.IllegalStateException: Cannot load configuration class: io.javabrains.springbootstarter.CourseApiApp .......I am getting this configuration error