In 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 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>3.1.3</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.khan.micro</groupId>
<artifactId>currency-conversion-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>currency-conversion-service</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
<spring-cloud.version>2022.0.4</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-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
<version>2.2.10.RELEASE</version>
</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>
</project>
in application.properties
spring.application.name=currency-conversion-service
server.port=8100
currency-exchange-service.ribbon.listOfServers=http://localhost:8000,http://localhost:8001
Main Class CurrencyConversionServiceApplication.java
package com.khan.micro.currencyconversionservice;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients("com.khan.micro.currencyconversionservice")
public class CurrencyConversionServiceApplication {
public static void main(String[] args) {
SpringApplication.run(CurrencyConversionServiceApplication.class, args);
}
}
CurrencyExchangeServiceProxy.java
package com.khan.micro.currencyconversionservice;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import com.khan.micro.currencyconversionservice.contoller.bean.CurrencyConversionBean;
@FeignClient(name="currency-exchange-service")
@RibbonClient(name="currency-exchange-service")
public interface CurrencyExchangeServiceProxy {
@GetMapping("/currency-exchange/from/{from}/to/{to}")
public CurrencyConversionBean getExchangevalue(@PathVariable("from") String from, @PathVariable("to") String to);
}
CurrencyConvrterController. java
package com.khan.micro.currencyconversionservice.contoller;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import com.khan.micro.currencyconversionservice.CurrencyExchangeServiceProxy;
import com.khan.micro.currencyconversionservice.contoller.bean.CurrencyConversionBean;
@RestController
public class CurrencyConvrterController {
@Autowired
private CurrencyExchangeServiceProxy currencyExchangeServiceProxy;
@GetMapping("/currency-converter/from/{from}/to/{to}/quantity/{quantity}")
public CurrencyConversionBean getCurrencyConverted(@PathVariable String from,
@PathVariable String to, @PathVariable BigDecimal quantity) {
Map<String, String> uriVariables = new HashMap<>();
uriVariables.put("from", from);
uriVariables.put("to", to);
ResponseEntity<CurrencyConversionBean> responseEntity = new RestTemplate()
.getForEntity("http://localhost:8000/currency-exchange/from/{from}/to/{to}",
CurrencyConversionBean.class,
uriVariables );
CurrencyConversionBean response = responseEntity.getBody();
return new CurrencyConversionBean(response.getId(), from, to, response.getConversionMultiple(),
response.getPort(), quantity, quantity.multiply(response.getConversionMultiple()));
}
@GetMapping("/currency-converter-feign/from/{from}/to/{to}/quantity/{quantity}")
public CurrencyConversionBean getCurrencyConvertedFeign(@PathVariable String from,
@PathVariable String to, @PathVariable BigDecimal quantity) {
CurrencyConversionBean response = currencyExchangeServiceProxy.getExchangevalue(from, to);
return new CurrencyConversionBean(response.getId(), from, to, response.getConversionMultiple(),
response.getPort(), quantity, quantity.multiply(response.getConversionMultiple()));
}
}
CurrencyConversionBean.java
package com.khan.micro.currencyconversionservice.contoller.bean;
import java.math.BigDecimal;
public class CurrencyConversionBean {
private Long id;
private String from;
private String to;
private BigDecimal conversionMultiple;
private int port;
private BigDecimal quantity;
private BigDecimal totalCalculatedAmount;
public CurrencyConversionBean() {
}
public CurrencyConversionBean(Long id, String from, String to, BigDecimal conversionMultiple, int port,
BigDecimal quantity, BigDecimal totalCalculatedAmount) {
super();
this.id = id;
this.from = from;
this.to = to;
this.conversionMultiple = conversionMultiple;
this.port = port;
this.quantity = quantity;
this.totalCalculatedAmount = totalCalculatedAmount;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
public String getTo() {
return to;
}
public void setTo(String to) {
this.to = to;
}
public BigDecimal getConversionMultiple() {
return conversionMultiple;
}
public void setConversionMultiple(BigDecimal conversionMultiple) {
this.conversionMultiple = conversionMultiple;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
public BigDecimal getQuantity() {
return quantity;
}
public void setQuantity(BigDecimal quantity) {
this.quantity = quantity;
}
public BigDecimal getTotalCalculatedAmount() {
return totalCalculatedAmount;
}
public void setTotalCalculatedAmount(BigDecimal totalCalculatedAmount) {
this.totalCalculatedAmount = totalCalculatedAmount;
}
}
while trying to access http://localhost:8100/currency-converter-feign/from/AUD/to/INR/quantity/1000 url getting given below error even if the both the currencyExchange Service are up and running on 8000 and 8001 ports
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Mon Sep 18 02:46:01 IST 2023
There was an unexpected error (type=Internal Server Error, status=500).
[503] during [GET] to [http://currency-exchange-service/currency-exchange/from/AUD/to/INR] [CurrencyExchangeServiceProxy#getExchangevalue(String,String)]: [Load balancer does not contain an instance for the service currency-exchange-service]
feign.FeignException$ServiceUnavailable: [503] during [GET] to [http://currency-exchange-service/currency-exchange/from/AUD/to/INR] [CurrencyExchangeServiceProxy#getExchangevalue(String,String)]: [Load balancer does not contain an instance for the service currency-exchange-service]
at feign.FeignException.serverErrorStatus(FeignException.java:265)
at feign.FeignException.errorStatus(FeignException.java:206)
at feign.FeignException.errorStatus(FeignException.java:194)
at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:104)
at feign.ResponseHandler.decodeError(ResponseHandler.java:136)
at feign.ResponseHandler.handleResponse(ResponseHandler.java:70)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:114)
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:70)
at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:96)
at jdk.proxy6/jdk.proxy6.$Proxy113.getExchangevalue(Unknown Source)
at com.khan.micro.currencyconversionservice.contoller.CurrencyConvrterController.getCurrencyConvertedFeign(CurrencyConvrterController.java:42)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1081)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:974)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:109)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:894)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1740)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:833)
can anyone tell what could be the reason for this error is this the dependancies issue or what could be else will be here
Please try to use this config: