Tag Archives: springcloud

How to Solve Error-SpringCloud-Feign and Sentinel integrate error

Feign integrate Sentinel error:

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 03-31 10:45:01:182 ERROR 21840 --- [ main] o.s.boot.SpringApplication : Application run failed
03-31 10:45:01:182 ERROR 21840 — [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘orderService’: Unsatisfied dependency expressed through field ‘userClient’; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name ‘cn.itcast.feign.clients.UserClient’: Requested bean is currently in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.annotation)

1SpringCloud-Feign integrate Sentinel error:

03-31 10:44:59:906  INFO 21840 --- [           main] cn.itcast.order.OrderApplication         : No active profile set, falling back to default profiles: default
03-31 10:45:00:320  INFO 21840 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=15e39e82-ae83-372c-bf12-c9f1083aeff7
03-31 10:45:00:441  INFO 21840 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.cloud.sentinel-com.alibaba.cloud.sentinel.SentinelProperties' of type [com.alibaba.cloud.sentinel.SentinelProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
03-31 10:45:00:442  INFO 21840 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'com.alibaba.cloud.sentinel.custom.SentinelAutoConfiguration' of type [com.alibaba.cloud.sentinel.custom.SentinelAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
03-31 10:45:00:596  INFO 21840 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8088 (http)
03-31 10:45:00:604  INFO 21840 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
03-31 10:45:00:604  INFO 21840 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.43]
03-31 10:45:00:605  INFO 21840 --- [           main] o.a.catalina.core.AprLifecycleListener   : Loaded Apache Tomcat Native library [1.2.31] using APR version [1.7.0].
03-31 10:45:00:605  INFO 21840 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
03-31 10:45:00:606  INFO 21840 --- [           main] o.a.catalina.core.AprLifecycleListener   : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
03-31 10:45:00:608  INFO 21840 --- [           main] o.a.catalina.core.AprLifecycleListener   : OpenSSL successfully initialized [OpenSSL 1.1.1l  24 Aug 2021]
03-31 10:45:00:691  INFO 21840 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
03-31 10:45:00:691  INFO 21840 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 769 ms
03-31 10:45:01:122  WARN 21840 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService': Unsatisfied dependency expressed through field 'userClient'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
03-31 10:45:01:124  INFO 21840 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
03-31 10:45:01:132  INFO 21840 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
03-31 10:45:01:182 ERROR 21840 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService': Unsatisfied dependency expressed through field 'userClient'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1425) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
	at cn.itcast.order.OrderApplication.main(OrderApplication.java:26) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.beforeSingletonCreation(DefaultSingletonBeanRegistry.java:355) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:227) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at com.alibaba.cloud.sentinel.feign.SentinelFeign$Builder$1.create(SentinelFeign.java:84) ~[spring-cloud-starter-alibaba-sentinel-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:64) ~[feign-core-10.10.1.jar:na]
	at feign.Feign$Builder.target(Feign.java:269) ~[feign-core-10.10.1.jar:na]
	at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:38) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:338) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:369) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:347) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
	at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:240) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1235) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
	... 21 common frames omitted

Solution:

Go to the parent pom file and modify the version of springcloud, change Hoxton.SR10 to Hoxton.SR9, and re-import the pom file

[Solved] Feign Call Port Error: HttpMessageNotReadableException：JSON parse error：Illegal character ((CTRL-CHAR, code 31)

Background

In a timed task, the remote interface is called every hour for data synchronization. At first, the implementation method was to call the remote interface in a loop and pass in a single record each time, because each time we need to complete the operation of establishing a connection, data transfer, and disconnection, which is more expensive network and connection resources; later, after testing no problem, we changed to pass in a list for bulk operation after the loop is completed, and then the problem appeared.

10: 12:28.881 [http-nio-8200-exec-3] error c.y.c.s.h. globalexceptionhandler – [handleruntimeexception, 82] – Request Address’/doit ‘, unknown exception occurred org. springframework. http. converter. HttpMessageNotReadableException: JSON parse error: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens; nested exception is com. fasterxml. jackson. core. JsonParseException: Illegal character ((CTRL-CHAR, code 31)): only regular white space (\r, \n, \t) is allowed between tokens

Environmental information

Version information of openfeign :

Problem analysis

feign is configured as follows:

# feign
feign:
  sentinel:
    enabled: true
  okhttp:
    enabled: true
  httpclient:
    enabled: false
  client:
    config:
      default:
        connectTimeout: 10000
        readTimeout: 10000
  compression:
    request:
      enabled: true
    response:
      enabled: true

From the configuration, we can understand that the current configuration enables the request and response compression function. We know that when the compression is actually related to the size of the request body, if the requested data body itself is small, it can be transmitted directly without compression, which can save CPU resources for compression; there is a possible reason: compression is a threshold value, more than a certain threshold will be compressed. This can explain the previous question: why is it OK to transfer one piece of data at a time, but there is an error when transferring the list?

 

Solution:

Just turn compression off.

Note: Due to the change to bulk transfer, the business processing takes longer and errors like “Timed out…” may appear at the request initiation side. The configuration here changes the timeout of HTTP connection from 10s to 60s; when the data synchronization is finished, change it back.

Springcloud configuration center client 3355 startup Error: error on get request for“ http://localhost:8761/eureka/apps/ “: Connection

The error contents are as follows:

error on GET request for "http://localhost:8761/eureka/apps/": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8761/eureka/apps/": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:785)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)
                            ...
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
     ...	

2022-01-08 22:16:56.800  WARN 15304 --- [           main] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: I/O error on GET request for "http://localhost:8761/eureka/apps/": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
2022-01-08 22:16:56.801  INFO 15304 --- [           main] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_UNKNOWN/windows10.microdone.cn - was unable to refresh its cache! This periodic background refresh will be retried in 30 seconds. status = Cannot execute request on any known server stacktrace = com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
		......

ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.configClientController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'config.info' in value "${config.info}"
2022-01-08 22:16:57.016  INFO 15304 --- [           main] com.netflix.discovery.DiscoveryClient    : Shutting down DiscoveryClient ...
2022-01-08 22:16:57.847  INFO 15304 --- [nfoReplicator-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/}, exception=I/O error on POST request for "http://localhost:8761/eureka/apps/UNKNOWN": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8761/eureka/apps/UNKNOWN": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
	......
	
2022-01-08 22:16:57.847  WARN 15304 --- [nfoReplicator-0] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: I/O error on POST request for "http://localhost:8761/eureka/apps/UNKNOWN": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
2022-01-08 22:16:57.849  WARN 15304 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_UNKNOWN/windows10.microdone.cn - registration failed Cannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

	......

2022-01-08 22:16:57.850  WARN 15304 --- [nfoReplicator-0] c.n.discovery.InstanceInfoReplicator     : There was a problem with the instance info replicator

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server

		......	

2022-01-08 22:16:57.851  INFO 15304 --- [           main] com.netflix.discovery.DiscoveryClient    : Unregistering ...
2022-01-08 22:16:58.855  INFO 15304 --- [           main] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://localhost:8761/eureka/}, exception=I/O error on DELETE request for "http://localhost:8761/eureka/apps/UNKNOWN/windows10.microdone.cn": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect stacktrace=org.springframework.web.client.ResourceAccessException: I/O error on DELETE request for "http://localhost:8761/eureka/apps/UNKNOWN/windows10.microdone.cn": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
	com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.cancel(EurekaHttpClientDecorator.java:71)
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	......

2022-01-08 22:16:58.855  WARN 15304 --- [           main] c.n.d.s.t.d.RetryableEurekaHttpClient    : Request execution failed with message: I/O error on DELETE request for "http://localhost:8761/eureka/apps/UNKNOWN/windows10.microdone.cn": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
2022-01-08 22:16:58.856 ERROR 15304 --- [           main] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_UNKNOWN/windows10.microdone.cn - de-registration failedCannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
	
		......
		
2022-01-08 22:16:59.013 ERROR 15304 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.configClientController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'config.info' in value "${config.info}"
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.3.7.jar:5.3.7]

Cause of problem:

Because my spring cloud version is too high, I lack related dependencies.

Solution:

Add the following dependencies to the spring cloud configuration center client POM file:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
    <version>3.1.0</version>
</dependency>

To illustrate, my spring cloud is version 2020.0.1, and the above dependencies should be added above the spring cloud g version.

[Solved] Springcloud Add Eureka to Startup Error

1.Error Messages:
Correct the classpath of your application so that it contains a single, compatible version of com.google.gson.GsonBuilder

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:
    java.lang.invoke.MethodHandleNatives.resolve(Native Method)
The following method did not exist:
    com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
The method's class, com.google.gson.GsonBuilder, is available from the following locations:
    jar:file:/E:/smallTools/maven/rep/com/google/code/gson/gson/2.1/gson-2.1.jar!/com/google/gson/GsonBuilder.class
The class hierarchy was loaded from the following locations:
    com.google.gson.GsonBuilder: file:/E:/smallTools/maven/rep/com/google/code/gson/gson/2.1/gson-2.1.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of com.google.gson.GsonBuilder
Process finished with exit code 1

2. Solution

Add gson dependency

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.6</version>
</dependency>

Springcloud builds a gateway and starts Error [Solved]

1.Spring MVC found on classpath, which is incompatible with Spring Cloud Gateway at this time. Please remove spring-boot-starter-web dependency.

Solution:

           <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-web</artifactId>
                </exclusion>

2. Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured.

Solution:

             <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-jdbc</artifactId>
                </exclusion>

OpenFeignClient Use Object to Receive text/plain Type Return Error

report errors

Could not extract response: no suitable HttpMessageConverter found for
response type [classxxxx] and content type [text/plain]

reason

The return type content type is not application/JSON, but text/plain. It cannot be deserialized into object type, as shown in the figure

spring cloud openfeign essentially uses okhttpclient for request. If it is text/plain, it will be treated as text and cannot be deserialized automatically like JSON string, The following is my feinclient:

in this case, it is necessary to do compatibility processing for the return of this content type
add the jackson2httpmessageconverter conversion class, and increase the compatibility of text/plain and text/HTML return types

import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

import java.util.ArrayList;
import java.util.List;

/**
 * @author <a href="mailto:[email protected]">Tino.Tang</a>
 * @version ${project.version} - 2021/12/9
 */
public class MyJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {

  public LokiJackson2HttpMessageConverter() {
    List<MediaType> mediaTypes = new ArrayList<>();
    mediaTypes.add(MediaType.TEXT_PLAIN);
    mediaTypes.add(MediaType.TEXT_HTML);
    setSupportedMediaTypes(mediaTypes);
  }
}

Add openfeign custom configuration and inject Decoder Bean.

import feign.Logger;
import feign.codec.Decoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringDecoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author <a href="mailto:[email protected]">Tino.Tang</a>
 * @version ${project.version} - 2021/11/29
 */
@Configuration
public class OpenFeignLogConfig {

  @Bean
  public Logger.Level feignLoggerLeave() {
    return Logger.Level.FULL;
  }

  @Bean
  public Decoder feignDecoder() {
    LokiJackson2HttpMessageConverter converter = new LokiJackson2HttpMessageConverter();
    ObjectFactory<HttpMessageConverters> objectFactory = () -> new HttpMessageConverters(converter);
    return new SpringDecoder(objectFactory);
  }
}```

After processing, the call to the feign client will no longer report errors, regardless of whether the type is application/json or text/plain, it can be correctly deserialized to Object.

[Solved] nacos Error: Client not connected,current status:STARTING,StatusRuntimeException

Nacos client connection operation 9848 grpc connection error of Nacos 2.0

After Nacos Server 2.0

Nacos version 2.0 adds a new gRPC communication method compared to 1.X, so 2 additional ports are needed. The new ports are automatically generated by performing a certain offset from the configured master port (server.port).
Port Offset from the master port Description
9848 1000 Client gRPC request server port for clients to initiate connections and requests to the server
9849 1001 Server-side gRPC request server port, used for synchronization between services, etc.

After Nacos client 2.0 is connected through grpc, you cannot use Nacos server version below 2.0

serverInfo.getServerPort() + rpcPortOffset() Port offset 1000
Perform serverCheck operation 
Report an error.
java.util.concurrent.ExecutionException: com.alibaba.nacos.shaded.io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
Error: RpcClient currentConnection is null
Caused by: ErrCode:-401, ErrMsg:Client not connected,current status:STARTING

Solution: use a lower version of Nacos client

[Solved] Eureka registry service starts error: Request execution error. Endpoint = defaultendpoint

Eureka registry service starts with an error request execution error. Endpoint = defaultendpoint {serviceurl = ' http://127.0.0.1:8000/eureka/ }

 Request execution error. endpoint=DefaultEndpoint{ serviceUrl='http://127.0.0.1:8000/eureka/}, exception=java.net.ConnectException: Connection refused: connect stacktrace=com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect

There are two reasons for the above problems:

The defaultzone attribute in the configuration file does not recognize that when Eureka is started, it will pull the information of other services by default and set it to close to run normally
fetch registry: false

The application.yaml configuration file is as follows

server:
  port: 8000
  # server name
spring:
  application:
    name: eureka-server
# Eureka address information configuration
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka
    register-with-eureka: false # Whether to register your own information to EurekaServer, the default is true
     fetch-registry: false # Whether to pull information about other services, the default is true

Eureka server startup error: cannot execute request on any known server

Article catalog

Error reporting screenshot reference: self inspection modification

Error reporting screenshot reference:

Self inspection

As soon as a new Eureka project was established, an error was reported. After checking the startup class and YML configuration file, it was found that the format of YML configuration file was wrong. The error is as follows:

Modification

There is an obvious indentation error in the screenshot, which makes Eureka unable to start normally. After modifying the indentation, it is as follows:

Screenshot of successful startup of Eureka server:

If the configuration file in YML format is prone to errors, we recommend that you use the configuration file in properties format; As follows:

Springboot startup error failed to configure a datasource 

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
	If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
	If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).


Process finished with exit code 1

This error is always reported when springboot starts
my solution:
1. Check whether the Resources folder is configured. Mine was gray before, and it is equipped with


2. Use Maven clean

and start successfully.

Using openfeign to remotely call the startup program to report an error

Add openfeign directly to POM

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

Program startup report found

No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?

Because the spring boot and spring cloud versions are higher, the loadbalancer dependency needs to be added

The problem is that there is no loadalanc, but note that the ribbon in Nacos will cause the loadalanc package to fail. Add it in the common POM

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-loadbalancer</artifactId>
    <version>3.0.3</version>
</dependency>

Springcloud Project Error: web.client.HttpServerErrorException$InternalServerError: 500 Internal Server Error

Question

In the springcloud project, the consumer module uses resttemplate to call the provider module. When accessing a method in the consumer module, the following error occurs:

org.springframework.web.client.HttpServerErrorException$InternalServerError: 500 Internal Server Error
	at org.springframework.web.client.HttpServerErrorException.create(HttpServerErrorException.java:79) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:125) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:785) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:743) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]

Solution:

When I first saw the error of 500, I naturally thought it was the problem of background service. However, the log information in the consumer module was relatively general, so it was difficult to locate the problem. After checking, it was found that an error occurred when the consumer used resttemplate to call the provider service , so check the log of the provider module, and sure enough, more detailed error information was found:

java.lang.IllegalArgumentException: Parameter value [2021-10-25] did not match expected type [java.util.Date (n/a)]

Then the problem will be solved