I am new to springboot. I have a controller class like below,
package com.example.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class Controller {
#RequestMapping("/hello")
public String getHi() {
return "Hi";
}
}
<?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>2.5.0</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>16</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>
Console,
Starting service [Tomcat]
Starting Servlet engine: [Apache Tomcat/9.0.46]
Initializing Spring embedded WebApplicationContextRoot WebApplicationContext: initialization completed in 626 ms
Tomcat started on port(s): 8080 (http) with context path ''
After running the project I tried opening "localhost:8080/hello" in a browser but I'm getting localhost connection refused. In console, I can able to see that, Tomcat server is started with port 8080.
Thanks in Advance.
UPDATE
I resolved my issue by adding below line in my Main class,
#Autowired
Controller controller;
Try accessing 127.0.0.1:8080/hello to ensure that the loopback is valid
Related
I am just trying to implement a sample rest controller on spring boot for learning. When i am sending the request through web browser i am getting a white label error.
My applications context path is set to /learn. Below are my source files, project structure and pom.xml.
TestController.java
package com.practice.learn.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
#RequestMapping("/learn")
public class TestController {
TestController(){
System.out.println("TestController initialized");
}
#GetMapping("/test")
public String testMethod() {
System.out.println("Inside test method");
return "This is sample text";
}
}
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>2.7.8</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.practice</groupId>
<artifactId>learn</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>learn</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</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-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
LearnApplication.java
package com.practice.learn;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class LearnApplication {
public static void main(String[] args) {
SpringApplication.run(LearnApplication.class, args);
}
}
application.properties
server.port=8081
server.servlet.context-path=/learn
since you already set the servlet context path as '/learn' in your configuration file, you do not need to add '/learn' again in the RequestMapping in your controller. just remove it and let us know.
i want to refresh bean when database is updated in runtime, so want to use /refresh endpoint to manually trigger it and refresh bean with new value.
but currently we are not using config server - can anyone guide how i can only make use of refresh scope
I just want to make use of refresh scope without needing config server.
My bean get value from the database for example
#Configuration
public class AppConfiguration {
#Autowired
MyRepository myRepo;
#Bean
#RefreshScope
DemoWebClient getDemoWebClient() {
String currentTime = new Date().getTime() + "";
return new DemoWebClient(myRepo.getTenantId());
}
}
tried to use spring cloud starter
but it is trying to connect config server
2022-01-16 13:25:10.733 INFO 17884 --- [-144.54.177.213] c.c.c.ConfigServicePropertySourceLocator : Connect Timeout Exception on Url - http://localhost:8888. Will be trying the next url if available
2022-01-16 13:25:10.733 WARN 17884 --- [-144.54.177.213] c.c.c.ConfigServicePropertySourceLocator : Could not locate PropertySource: I/O error on GET request for "http://localhost:8888/application/default": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
2022-01-16 13:25:13.836 INFO 17884 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
tried to disable config server lookup - didn't work
spring.cloud.config.enabled=false
spring.cloud.config.import-check.enabled=false
below is my pom
<?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>2.2.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>RefreshScopeDemoApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>RefreshScopeDemoApp</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<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>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
</project>
You need to have the actuator enabled on your application. Then you can just call the endpoint /actuator/refresh of your application, to refresh the beans that need to be refreshed.
The important thing you must understand is that, the actuator must be enabled on the client application of the config server, meaning the application that connects to the config server and not the actual config server.
I am trying to deploy a spring boot application to aws.
I changed the port to 5000 via application.properties
Now, url/api/hello works fine but url/ doesn't work
I am getting a white label error.
package com.example.package-name;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
#EnableAutoConfiguration
#SpringBootApplication
#ComponentScan()
public class DemoApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>package-name</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.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>
Can anyone tell me how to fix this?
Is there anything wrong with the main Starter file?
Note: Everything works fine locally, the error page is loading instead
of index page only in AWS
I assume you deploy in aws elastic beanstalk tomcat server, please make sure access via beanstalk URL which will give you after uploading jar/war, generally whitespace error gives you whenever you try to access wrong URL/wrong parameters, if possible provide details with screenshots.
In this coding exercise for learning microservices, I've created a Netflix Zuul project for service routing my microservices.
Sadly, the /routes endpoint does not seem to be mounted. Everything else seems to be working fine: Defining prefixes and setting up specific routes for my services.
There are no errors on the zuul server log files.
When I try to hit the /routes url on postman, I get an 404 error:
My Zuul application class:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
#SpringBootApplication
#EnableZuulProxy
public class ZuulServerApplication {
public static void main(String[] args) {
SpringApplication.run(ZuulServerApplication.class, args);
}
}
pom.xml file:
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion> <!--should be set to 4.0.0 -->
<groupId>com.booking.system.hotel</groupId>
<version>0.0.1-SNAPSHOT</version>
<artifactId>hotel-gateway-service-server</artifactId>
<name>Hotel Gateway service - zuul</name>
<description>Hotel Gateway service - it uses Netflix Zuul Proxy Server</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<start-class>com.booking.system.hotel.zuulsvr.ZuulServerApplication</start-class>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-client</artifactId>
</dependency>
</dependencies>
<build>
<finalName>hotel-gateway-service-server</finalName> <!--name of the jar -->
<plugins>
<!-- packages the project as an executable jar, as an Spring Boot application -->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!-- used for running tests at various stages -->
</plugins>
</build>
</project>
bootstrap.yml file:
spring:
application:
name: hotel-gateway-service-server
profiles:
active:
default
cloud:
config:
enabled: true
Zuul configuration file from configuration server:
zuul.ignored-services: "*"
zuul.prefix: /api
zuul.routes.hotel-reservations-service: /reservations/**
zuul.routes.hotel-rooms-service: /rooms/**
docker-compose.yml entry for initializing the zuul gateway server:
hotel-gateway-service-server: #zuul server
image: imageprefix/hotel-gateway-service-server
ports:
- 5555:5555
environment:
PROFILE: "dev"
SERVER_PORT: "5555"
CONFIGSERVER_URI: "http://hotel-configuration-server:8888"
CONFIGSERVER_PORT: "8888"
EUREKASERVER_URI: "http://hotel-service-discovery-server:8761/eureka/"
EUREKASERVER_PORT: "8761"
I don't seem to spot what I am missing.
The actuator base path has changed to /actuator. So you need to use /actuator/routes. It is also not enabled by default.
management.endpoints.web.exposure.include=*
I generated a project on start.spring.io with the following project dependencies:
Jersey (JAX-RS)
JPA
PostgreSQL
Web
When I try to access localhost:8080/homeroom/webapi/test I get a page with the following error:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
I get this error no matter what url I try to access.
In my console info I can see it print Mapping servlet: 'jerseyServlet' to [/webapi/*] so I know my config class is being registered. When I change #ApplicationPath("/webapi") to #ApplicationPath("/"), a GET on localhost:8080/homeroom/test or localhost:8080/homeroom/ returns a blank page instead, with no text or error.
Why can't I access my resource?
This is my 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.homeroomed</groupId>
<artifactId>homeroom</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>HomeRoom</name>
<description>HomeRoom REST API</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.4-1201-jdbc41</version>
<scope>runtime</scope>
</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>
I'm trying to do a descriptor-less deploy so I have:
#Component
#ApplicationPath("/webapi")
public class MyJerseyConfig extends ResourceConfig{
public MyJerseyConfig() {
// String packageName =TestJerseyResource.class.getPackage().getName();
// this.packages(packageName);
this.register(TestJerseyResource.class);
// System.out.println("The package is:"+packageName);
}
}
And I have the following resource:
#Component
#Path("/test")
public class TestJerseyResource {
#GET
#Produces(MediaType.APPLICATION_JSON)
public String getTest()
{
return "Hi!";
}
}
I'm running the project from:
#SpringBootApplication
public class HomeRoomApplication {
public static void main(String[] args) {
SpringApplication.run(HomeRoomApplication.class, args);
}
}
UPDATE:
So 2 things:
I had to use spring annotations #Controller and #RequestMapping instead of Jersey's #PATH and #GET, and had to GET /webapi/test instead of /homeroom/webapi/test
The reason you can't access your resource from looking at the information you provided is you there is no /homeroom anywhere I saw in your code.
This is a valid URL for your project:
http://localhost:8080/webapi/test
If you wanted homeroom to be in the URL you could change the application path value to homeroom instead of webapi.
Well, quoting from #ApplicationPath JavaDoc:
May only be applied to a subclass of Application.
https://docs.oracle.com/javaee/6/api/javax/ws/rs/ApplicationPath.html
That might be part of the problem...