ERROR org.springframework.boot.SpringApplication - Application run failed - spring-boot

I am trying to implement a POC in spring dataflow. I am using "spring-cloud-starter-dataflow-server-local" dependency to create dataflow server in local. But it is giving below error :
ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)V
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:161)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:102)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:68)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at com.ms.batch_ui.App.main(App.java:14)
Below is pom.xml
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ms</groupId>
<artifactId>abc-ui</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>abc-ui</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
</parent>
<properties>
<java.version>8</java.version>
<h2.version>1.4.193</h2.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-dataflow-server-local</artifactId>
<version>1.6.3.RELEASE</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
</dependencies>
</project>
And I have very basic java file to launch the app
#EnableDataFlowServer
#SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class,args);
}
}
I think the error might be due to version compatibility issues between dataflow server-local and spring boot, but I am not able to find the correct version.
I have also searched in https://github.com/spring-cloud/spring-cloud-dataflow/releases, but spring-cloud-starter-dataflow-server-local is not given here.
Please help me with correct version matrix.

You are using Spring Cloud Data Flow release - Edgware.SR4. Its Compatible with Spring Boot 1.5.14.
For Example: Hoxton.SR8 (spring cloud version) compatible with 2.3.3.RELEASE(spring boot)
Reference: https://github.com/spring-cloud/spring-cloud-dataflow/releases?after=v1.7.4.RELEASE
You are getting the above Exception, because you did not add the spring cloud dependencyMangement block. But you need a dependency management block for spring cloud (this block is required for a spring cloud technologies - bunch of technologies like spring cloud ribbon, spring cloud zuul & so on).
Add this also,
<properties>
<java.version>8</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
I recommend you create a spring boot project using start.spring.io, add required dependencies, choose your spring boot required version, which gives spring cloud compatible versions, instead of manually selecting on your own.
Note:
you can check all the compatible versions(spring boot & spring cloud data flow) in the same page by scrolling down & using next button

Related

How to run Swagger 3 on Spring Boot 3

Using a fresh Spring Initialzr with Java17 and Spring Boot 3.0.0, and an extra addition to the pom.xml for Springfox Swagger 3, I can't for the life of me get Swagger pages to work. Instead, I get the whitelabel error page with 404.
Pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-boot-starter</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
The standard Swagger URLs as defined in this Github Issues page aren't working for the above pom.xml project.
I had given up and went to use Spring Boot 2.7 after posting the question. But, after seeing Dmitriy's answer though, I checked Springdoc one last time and found that Springdoc v2 does support Spring Boot 3.
Essentially, one has to place the following in their pom:
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.0</version>
</dependency>
Then one can access the Swagger page using the following URL: http://localhost:8080/swagger-ui.html (Don't forget to add context path if you need it). For some reason, when opening, it redirects to http://localhost:8080/swagger-ui/index.html although going for that initially returned 404...
in addition to adding springdoc-openapi-starter-webmvc-ui (v2.0.2 for me) as indicated in the accepted answer, I also needed to remove org.springdoc:springdoc-openapi-ui:1.6.13 .
It was there because I had tried it before. If present, there's still a non Jakarta reference that Spring tries to resolve (and fails to do so).
I also needed to add this dependency, otherwise I would have a nasty message at startup (version is resolved by Spring Boot BOM) :
implementation group: 'org.hibernate.validator', name: 'hibernate-validator'
Lastest
springfox-boot-starter version 3.0.0
and
springdoc-openapi-ui 1.6.13
seems not to support spring-boot 3.
We need to wait until the new version adopts jakarta.servlet package
Springdoc is working with Spring boot 3.0.1
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.2</version>
</dependency>
Default URL: http://localhost:8080/swagger-ui/index.html
For Gradle you can add this:
implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.0.0'
I agreed with #Ahmed Tawfik because I also faced the same. But today I tried that same approach with the new version of "springdoc-openapi-starter-webmvc-ui" dependency and Spring Boot 3.0.2-SNAPSHOT.
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.2</version>
</dependency>
because the previous one "springdoc-openapi-ui" is changed to the above one.
Also, include below the path to the security config for swagger UI.
"/v3/api-docs/**","/swagger-ui/**"
For my project,
#Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
return http.cors(AbstractHttpConfigurer::disable)
.csrf(AbstractHttpConfigurer::disable)
.exceptionHandling(exceptionHandlingConfigurer -> exceptionHandlingConfigurer.authenticationEntryPoint(unauthorizedHandler))
.authorizeHttpRequests(authorizationManagerRequestMatcherRegistry -> {
try {
authorizationManagerRequestMatcherRegistry
.requestMatchers(HttpMethod.POST, POST_AUTH_WHITELIST).permitAll()
.requestMatchers(HttpMethod.GET, GET_AUTH_WHITELIST).permitAll()
.requestMatchers("/v3/api-docs/**", "/swagger-ui/**").permitAll()
.anyRequest()
.authenticated()
.and()
.sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS));
} catch (Exception e) {
throw new ResourceNotFoundException(e.getMessage());
}
}
)
.formLogin(AbstractHttpConfigurer::disable)
.httpBasic(AbstractHttpConfigurer::disable).addFilterBefore(jwtAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class)
.authenticationProvider(daoAuthenticationProvider()).build();
}
The swagger UI link will be:
http://server:port/context-path/swagger-ui.html
Please adjust the server, port, and context-path regarding your personal changes.
All the above steps are working fine with my project. I don't need extra configuration.
Also, you can add the custom path (Optional):
springdoc.swagger-ui.path=/swagger-ui.html
Here is the Official Documentation of OpenApi 3 and Spring Boot : https://springdoc.org/v2/#features
In the above documentation, you can explore additional configurations and other things also.
Happy Learning! ✌️
Use Open API instead swagger for Spring v3.0. Follow this document Open API Docs
Following dependencies working fine to me.
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sample.app</groupId>
<artifactId>hello-world</artifactId>
<version>1.0.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.1</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.0.0</version>
</dependency>
</dependencies>
</project>

Error Deploying Spring Boot App using 2.6.2 on IBM Websphere 8.5.5.20

I'm trying to Deploying a spring boot app using 2.6.2 on IBM Websphere 8.5.5.20 (Using java 8)
To test out the Issue I have tried to deploy a simple Hello World restcontroller and facing the issues noted below. I'm able to deploy the application using Spring Boot 1.5 on Websphere 8.5.5.20, but facing difficulty when moving to spring-boot 2.6.2.
Please note I have tried with the javax.servlet and jakarta.servlet (version as per spring boot dependencies). I have followed this Link [https://stackoverflow.com/questions/48156126/websphere-8-5-with-spring-5], Deploy Spring Boot 2.x apps on WebSphere 8.5.5
I get the following error based on how I have the classloader for my app by setting it from
Enterprise Applications > simple-boot > Manage Modules > simple-boot.war
Parent Last
Error:
[1/7/22 16:39:57:407 EST] 00000001 ContainerHelp E WSVR0501E: Error creating component com.ibm.ws.runtime.component.CompositionUnitMgrImpl#c412fa58
com.ibm.ws.exception.RuntimeWarning: com.ibm.ws.exception.RuntimeWarning: com.ibm.ws.webcontainer.exception.WebAppNotLoadedException: Failed to load webapp: Failed to load webapp: javax.servlet.ServletContainerInitializer: Provider ch.qos.logback.classic.servlet.LogbackServletContainerInitializer not a subtype
Parent First
Error:
[1/7/22 16:42:17:173 EST] 00000047 SystemOut O 2022-01-07 16:42:17.173 WARN 31546 --- [ver.startup : 1] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: javax/validation/Configuration.getDefaultParameterNameProvider()Ljavax/validation/ParameterNameProvider; (loaded from file:/xxxxxxx/was/INSTANCE1/plugins/javax.j2ee.validation.jar by org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader#25be5b0d) called from class org.springframework.validation.beanvalidation.LocalValidatorFactoryBean (loaded from file:xxxx/simple-boot.ear/simple-boot.war/WEB-INF/lib/spring-context-5.3.14.jar by
com.ibm.ws.classloader.CompoundClassLoader#24768f5e[war:simple-boot/simple-boot.war]
My pom.xml
Note: In this pom.xml I have javax.servlet using 3.1.0 for testing but as noted above tried with default version as per the spring boot dependencies also with same result.
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.my.testApp</groupId>
<artifactId>simple-webapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>simple-boot</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
<exclusions>
<exclusion>
<groupId>jakarta.validation</groupId>
<artifactId>jakarta.validation-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>3.0.0</version>
</dependency>
</dependencies>
<build>
<finalName>simple-boot</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Based on the error message, the parent-last version looks like it's failing because there is a copy of the Servlet API packaged in your application. This is not a usable configuration, because the container will link to its own copy of the API, and as a result it wouldn't be able to successfully cast application artifacts that link to their own API instance. There are some APIs for which you can bring your own version in the app, but Servlet is not among them.
For the parent-first failure, it looks like Spring is expecting a newer version of the javax.validation package than is provided by the server - it's calling a method that doesn't exist in the server's version. WebSphere 8.5.5 implements Java EE 6, which includes Bean Validation 1.0, and that method wasn't added until Bean Validation 1.1. You'll need a version of Spring that works with Java EE 6 or is configurable to avoid higher-version dependencies. It might also be possible to resolve this by running parent-last and including a separate implementation along with the API (obviously, removing the Servlet API as referenced in the previous paragraph), although I'm not familiar enough with the Bean Validation API to know whether that would cause a conflict with the server runtime in the same way as Servlet.

Spring-boot : Problem deploying WAR file in Tomcat 7

All,
I built a sample app using spring-boot, maven and it worked fine in my IDE using mvn spring-boot:run. But, when I attempt to deploy the app as a WAR(mvn clean install) in Tomcat 7 I get the following error. Please help me find the reason for the issue.
**INFO: validateJarFile(C:\_tools\apache-tomcat-7.0.96\webapps\spring-server-2.1.8.RELEASE\WEB-INF\lib\tomcat-embed-el-9.0.24.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/el/Expression.class Oct 16, 2019 2:31:57 PM org.apache.catalina.core.ContainerBase addChildInternal
SEVERE: ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/spring-server-2.1.8.RELEASE]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1018)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:994)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2020)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)**
Here's my POM file.
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.service.data</groupId>
<artifactId>spring-server</artifactId>
<packaging>war</packaging>
<name>dev-tools-server</name>
<description>Spring Backend to access Tandem SQL/MX</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
And this is my class file
#SpringBootApplication
public class SpringServerApplication extends SpringBootServletInitializer {
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringServerApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(SpringServerApplication.class, args);
}
}
Please, in your pom.xml, try to remove this:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
And replace this:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
by this:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
And try again.
This makes sure that you're excluding the embedded Tomcat from the dependency tree in your project.
UPDATE
Add the Servet API as provided to your classpath.
The error in the coments happens because the tomcat (which has the servlet API implementation and specification as transitive dependency) has been removed, so there's no Servlet API available on your classpath
Add the 3.0.1 Servlet API specification as you're using Tomcat 7
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
You cannot run a Spring Boot 2.x application on Tomcat 7. Due to the simple fact that Spring Boot 2.x depends on Spring Framework 5.x which has a minimal Servlet API requirement for version 3.1 (see the Whats New In Spring 5).
You need at least Tomact 8.5 to run it (8.0 in theory but that has been superseded by 8.5).
To fix use Tomcat 8.5 or downgrade to the Spring Boot 1.5 line.
See also: Using Spring Boot 2.0 with Tomcat 7.0.82

ClassNotFoundException with Spring WebFlux Security

I'm having the following problem:
I am trying to setup a basic Spring Boot (2.0.0.M2) Project containing Spring Webflux and Spring Security.
My pom.xml looks like this (generated via start.spring.io):
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.M2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
...
</dependencies>
SpringSecurityConfig:
#EnableWebFluxSecurity
public class SecurityConfig extends WebFluxSecurityConfiguration {}
I am not getting any further because I get an exception on startup:
Caused by: java.lang.ClassNotFoundException: org.springframework.security.web.server.context.SecurityContextRepository
So I figure that the whole org.springframework.security.web.server package is not on the classpath, although it should be there, since it is included in the API docs.
Seems like I am doing something wrong, but I don't know what.
Currently Spring Boot's spring-boot-starter-security does not include spring-security-webflux.
Add it as project dependency explicitly.
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-webflux</artifactId>
</dependency>
See this issue : Provide auto-configuration for WebFlux-based security.
BTW, check my working codes: https://github.com/hantsy/spring-reactive-sample/tree/master/boot
Updated: In Spring Boot 2.0.0.RELEASE, spring-boot-starter-security includes webflux support.

Unable to run localhost in Spring Boot application (Tomcat server)

I've been learning Spring using the following tutorials: https://www.youtube.com/playlist?list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x
I have created a Maven project and tried to run the Spring Boot application while referring to these videos:
https://www.youtube.com/watch?v=E7_a-kB46LU&index=9&list=PLqq-6Pq4lTTbx8p2oCgcAQGQyqN8XeA1x
I tried to run my Spring application on Tomcat server but the localhost isn't working. (Port 8080)
My pom.xml looks like this:
<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">
<modelVersion>4.0.0</modelVersion>
<groupId>io.javabrains.springbootquickstart</groupId>
<artifactId>course-api-new</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Java Brains Course API</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
</project>
CourseApiApp.java :
package io.javabrains.springbootstarter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class CourseApiApp {
public static void main(String[] args) {
SpringApplication.run(CourseApiApp.class, args);
}
}
According to the video localhost should display Whitelist error on running the application, but it doesn't run at all.
Any help would be appreciated, thanks!
I would suggest that you start your project from beginning. To create a valid spring-boot project you have a very good web based generator for spring-boot starter applications.
https://start.spring.io/
For a web application with an embedded tomcat you should use web project.
Using STS you can create the same by choosing new -> spring starter project.
A wizard will appear and you can choose your project informations:
And then in the second step you dependencies:
After generating your project your pom.xml should look like that:
<?xml version="1.0" encoding="UTF-8"?>
<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">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Your application should start normally and tomcat listens on localhost:8080.
EDIT
The starter just have a new design:
Solution: add web starter dependency to pom.xml for maven
No need to create new app. Just change this starter dependency to starter-web dependency:
Starter
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
Starter Web
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
You should try to run spring-boot as sudo
sudo mvn spring-boot:run
It could be possible that STS by default uses Tomcat version 7 and if you happen to use version 8, then would need to specify the same in pom.xml
<properties>
<tomcat.version>8.0.47</tomcat.version>
</properties>
I also faced the same issue. Try creating Spring Boot apprlication by choosing Spring Boot starter project in STS.
Right click on STS->New->Spring Starter Project->Give name and click on Next->Choose Web and tick mark on Web and search for Dev Tools and tick mark Dev Tools and click on Finish
Now click on the project and Run as Spring Boot Application.
In application.properties put server.port=8080
I faced the similar issue. I too was following the JavaBrains SpringBoot example. This is what I did:
I created a fresh spring boot project using STS tool and included the same code as provided by you and it worked!
You need to tell springboot where do you have to scan your reference classes
#SpringBootApplication
#ComponentScan(basePackages= {"com.testbean.controller", "com.testbean.model", "com.testbean.service"})
public class DemoApplication {
Use #ComponentScan("io.javabrains") and mention the package in which the Controller is present. eg.
#SpringBootApplication
#ComponentScan("io.javabrains")
public class CourseApiApp {
public static void main(String[] args) {
SpringApplication.run(CourseApiApp.class, args);
}
}
In a spring boot application, by default spring searches for components in the same package which is having the #SpringBootApplication annotation.
Follow this tutorial to setup JavaJDK, Tomcat and Maven: https://jeromejaglale.com/doc/spring4_tutorial/installation_macos
Next step move to Terminal app: type cd root_project and run sudo mvn spring-boot:run
I managed to solve with a tip above the server.port
I added as said: server.port = 8090 and it worked.
https://drive.google.com/file/d/1lZAEaD5VZdpnyffROn9X37mZm4vaQJ9G/view?usp=sharing

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