Know Dubbo from scratch

Keywords: Programming Java Apache Dubbo Spring

[TOC]

1. What is Dubbo?

http://dubbo.apache.org/zh-cn/index.html

Apache Dubbo is a high performance Java RPC framework.

Dubbo is a distributed service framework dedicated to providing high-performance and transparent RPC remote service invocation solutions and SOA service governance solutions. Simply put, Dubbo is a service framework. If there is no distributed requirement, it is not necessary to use it. Only when it is distributed, there will be the requirement of a distributed service framework like dubbo. It is essentially an east part of service invocation. In other words, it is a distributed framework of remote service invocation (farewell to Web). WSdl in Service mode, registered on Dubbo in the way of service provider and consumer) Its core part includes:

  1. Telecommunication: Provides Abstract encapsulation of a variety of NIO frameworks based on long connections, including multiple threading models, serialization, and "request-response" mode of information exchange.

  2. Cluster fault tolerance: Provide transparent remote procedure call based on interface method, including multi-protocol support, as well as cluster support such as soft load balancing, failure tolerance, address routing, dynamic configuration, etc.

  3. Automatic discovery: Based on registry directory service, service consumers can dynamically find service providers, make addresses transparent, and make service providers increase or decrease machines smoothly.

2. What can Dubbo do?

  1. Transparent remote method calls, just like calling local methods, require simple configuration without any API intrusion.
  2. Software load balancing and fault-tolerant mechanism can replace hardware load balancer such as F5 in intranet, reduce cost and reduce single point.
  3. Service automatic registration and discovery, no longer need to write dead service provider address, registry queries service provider's IP address based on interface name, and can smoothly add or delete service provider.

Dubbo uses full spring configuration, transparent access to the application, no API intrusion to the application, just use Spring to load the configuration of Dubbo, Dubbo Spring-based Schema extension to load.

3.Dubbo Architecture

Node role description:

Provider: A service provider that exposes services.

Consumer: A service consumer who calls a remote service.

Registry: Registry for service registration and discovery.

Monitor: The Monitoring Center for calling times and calling times of statistical services.

Container: Service Running Container.

Call relationship description:

  1. The service container is responsible for starting, loading and running the service provider.

  2. At startup, service providers register their services with the registry.

  3. When service consumers start up, they subscribe to the registry for the services they need.

  4. The registry returns a list of service provider addresses to consumers, and if there is a change, the registry will push the change data to consumers based on long connections.

  5. Service consumers, from the list of provider addresses, select one provider for invocation based on the soft load balancing algorithm, and if the invocation fails, choose another one for invocation.

  6. Service consumers and providers accumulate calls and calls in memory and send statistics to the monitoring center at regular intervals every minute.

4. Use of Dubbo

Dubbo uses full Spring configuration, transparent access to the application, no API intrusion to the application, just use Spring to load the configuration of Dubbo, Dubbo Spring-based Schema extension to load. If you don't want to use Spring configuration, you can call it through API (annotated, not recommended)

Download and install zookeeper registry (multicast is not recommended)

1.Windows

Download address: https://www.apache.org/dyn/closer.cgi/zookeeper/

Usage: Download the decompression, enter the decompression directory and run zkServer.cmd to start the Registry Service Center

Screenshot:

2.MacOS

Download address: https://www.apache.org/dyn/closer.cgi/zookeeper/

Usage: Download the decompression, enter the decompression directory and run zkServer.sh start to start the Registry Service Center

3.Linux

Download address: https://www.apache.org/dyn/closer.cgi/zookeeper/

Usage: Download the decompression, enter the decompression directory and run zkServer.sh start to start the Registry Service Center

Service Provider

1. Define service interfaces (which need to be packaged separately and shared between service providers and consumers)

DemoService.java

package org.apache.dubbo.demo;

public interface DemoService {
    String sayHello(String name);
}
2. Service Provider Implementation Interface: (Hidden Implementation to Service Consumer)

DemoServiceImpl.java

package org.apache.dubbo.demo.provider;
 
import org.apache.dubbo.demo.DemoService;
 
public class DemoServiceImpl implements DemoService {
    public String sayHello(String name) {
        return "Hello " + name;
    }
}
3. Expose the service with Spring configuration declaration:

dubbo-provider.xml: 

?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd        http://dubbo.apache.org/schema/dubbo        http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
 
    <!-- Providers apply information for computing dependencies -->
    <dubbo:application name="hello-world-app"  />
 
    <!-- Use multicast Radio Registry Exposure Service Address -->
    <dubbo:registry address="multicast://224.5.6.7:1234" />
 
    <!-- use dubbo Protocol Exposure Service at Port 20880 -->
    <dubbo:protocol name="dubbo" port="20880" />
 
    <!-- Declare service interfaces that need to be exposed -->
    <dubbo:service interface="org.apache.dubbo.demo.DemoService" ref="demoService" />
 
    <!-- And local bean Implementing services as well -->
    <bean id="demoService" class="org.apache.dubbo.demo.provider.DemoServiceImpl" />
</beans>
4. Load the Spring configuration and start the service:

Provider.java: 

import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Provider {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"spring/dubbo-provider.xml"});
        context.start();
        System.in.read(); // press any key to exit
    }
}

Or start with spring Boot

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource("spring/dubbo-provider.xml")
public class DubboProviderApplication {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(DubboProviderApplication.class, args);

    }
}

Service consumers:

Register the interface you need to call in application Context-dubbo.xml.

1. Referring to remote services through Spring configuration

dubbo-consumer.xml: 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:dubbo="http://dubbo.apache.org/schema/dubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-4.3.xsd        http://dubbo.apache.org/schema/dubbo        http://dubbo.apache.org/schema/dubbo/dubbo.xsd">
 
    <!-- The consumer application name, used to calculate dependencies, is not a matching condition, not the same as the provider -->
    <dubbo:application name="consumer-of-helloworld-app"  />
 
    <!-- Use multicast Radio Registry Exposure Discovery Service Address -->
    <dubbo:registry address="multicast://224.5.6.7:1234" />
 
    <!-- Generate remote service proxies that can be local and local bean Same use demoService -->
    <dubbo:reference id="demoService" interface="org.apache.dubbo.demo.DemoService" />
</beans>
2. Load the Spring configuration and call the remote service:

Consumer.java

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.apache.dubbo.demo.DemoService;
 
public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"spring/dubbo-consumer.xml"});
        context.start();
        DemoService demoService = (DemoService)context.getBean("demoService"); // Getting a remote service agent
        String hello = demoService.sayHello("world"); // Executing remote methods
        System.out.println( hello ); // Display the result of the call
    }
}

Or start with spring Boot

import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ImportResource;

@SpringBootApplication
@ImportResource("spring/dubbo-consumer.xml")
public class DubboConsumerApplicaiton {

    public static final Logger logger = LoggerFactory.getLogger(DubboConsumerApplicaiton.class);

    public static void main(String[] args) {
        SpringApplication.run(DubboConsumerApplicaiton.class, args);

    }
}

And add the corresponding restful interface to provide interface access

@RequestMapping("/demo")
public ModelAndView testDemo() {
    ModelAndView modelAndView = new ModelAndView("index");
    org.apache.dubbo.rpc.RpcContext.getContext().setAttachment(Constants.TAG_KEY, "gray");
    modelAndView.addObject("result", demoService.sayHello("Dubbo Meetup"));
    return modelAndView;
}

Modify the corresponding index page

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Vertical centering in valid CSS</title>
    <style type="text/css">
        .text{text-align:center;  }
    </style>

</head>
<body>
<div class="text" style="margin-top:300px;font-size: 50px;">${result.msg}</div>
<div class="text" style="margin-top:30px;font-size: 35px;color:#5079bb;">From : ${result.userName}</div>
</body>
</html>
3.dubbo management page:

https://github.com/apache/dubbo-admin

Post-startup access http://localhost:8080/dubbo-admin/

Enter account password root/root

Application page:

Provider page:

Consumer Page:

Service page:

If the test is successful, it's ok ay to see if the state is normal.

provider-log:

2019-07-04 11:37:49,326 [DubboServerHandler-192.168.0.46:20880-thread-2] INFO  org.apache.dubbo.demo.impl.DemoServiceImpl (DemoServiceImpl.java:31) -  [DUBBO] [11:37:49] Hello Alterem., request from consumer: /192.168.0.46:52031, dubbo version: 2.7.0, current host: 192.168.0.46

5. Problem of using Dubbo

1,org.springframework.beans.factory.BeanCreationException

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mgmtFactoryInoutDetailsController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'goodsInoutServiceImpl' available
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:321) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1268) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.method.HandlerMethod.createWithResolvedBean(HandlerMethod.java:299) ~[spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:323) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:61) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:352) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1160) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:940) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [servlet-api.jar:na]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.4.jar:1.2.4]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at ue.common.filter.MultiPrefixHideUrlFilter.doFilter(MultiPrefixHideUrlFilter.java:76) [YKXCommon-3.3.01.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at ue.common.filter.PageableFilter.doFilterInternal(PageableFilter.java:48) [YKXCommon-3.3.01.jar:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.36]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.36]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.36]
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.36]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528) [catalina.jar:8.0.36]
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099) [tomcat-coyote.jar:8.0.36]
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670) [tomcat-coyote.jar:8.0.36]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520) [tomcat-coyote.jar:8.0.36]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476) [tomcat-coyote.jar:8.0.36]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.36]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'goodsInoutServiceImpl' available
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1213) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:275) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:522) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:496) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:627) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:318) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	... 67 common frames omitted

Reason analysis:

Error creating bean with name 'mgmtFactoryInoutDetailsController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'goodsInoutServiceImpl' available
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:321)

Solution

Add the corresponding declaration exposure service in dubbo-provider.xml

<dubbo:service interface="ue.biz.service.biz.GoodsInoutService" ref="goodsInoutServiceImpl"/>

Add corresponding service subscriptions to dubbo-consumer.xml

<dubbo:reference id="goodsInoutServiceImpl" interface="ue.biz.service.biz.GoodsInoutService"/>

2,org.apache.dubbo.rpc.RpcException

org.apache.dubbo.rpc.RpcException: No provider available from registry 120.79.246.86:2181 for service ue.biz.service.bas.EnterpriseUserService on consumer 192.168.0.63 use dubbo version 2.7.0, please check status of providers(disabled, not registered or in blacklist).
	at org.apache.dubbo.registry.integration.RegistryDirectory.doList(RegistryDirectory.java:522) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.cluster.directory.AbstractDirectory.list(AbstractDirectory.java:82) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.list(AbstractClusterInvoker.java:274) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:238) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:75) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:57) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.common.bytecode.proxy7.getCurrent(proxy7.java) ~[dubbo-2.7.0.jar:2.7.0]
	at ue.mgmt.controller.CommonController.main(CommonController.java:787) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:849) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:760) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [servlet-api.jar:na]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [servlet-api.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) [shiro-core-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) [shiro-web-1.2.4.jar:1.2.4]
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.2.4.jar:1.2.4]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at ue.common.filter.MultiPrefixHideUrlFilter.doFilter(MultiPrefixHideUrlFilter.java:76) [YKXCommon-3.3.01.jar:na]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at ue.common.filter.PageableFilter.doFilterInternal(PageableFilter.java:48) [YKXCommon-3.3.01.jar:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.20.RELEASE.jar:4.3.20.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240) [catalina.jar:8.0.36]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.36]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.36]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.36]
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.36]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.36]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528) [catalina.jar:8.0.36]
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099) [tomcat-coyote.jar:8.0.36]
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670) [tomcat-coyote.jar:8.0.36]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520) [tomcat-coyote.jar:8.0.36]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476) [tomcat-coyote.jar:8.0.36]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.36]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

Cause analysis

No provider available from registry 120.79.246.86:2181 for service ue.biz.service.bas.EnterpriseUserService on consumer 192.168.0.63 use dubbo version 2.7.0, please check status of providers

Solution

It may be that providers are not started, or that the services exposed by providers are disabled, starting providers or disabling them.

3,java.lang.IllegalStateException

java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [io.netty.channel.nio.NioEventLoop]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
	at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1352)
	at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1340)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1205)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.loadClass(PackagingDataCalculator.java:207)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.bestEffortLoadClass(PackagingDataCalculator.java:226)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.computeBySTEP(PackagingDataCalculator.java:138)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.populateUncommonFrames(PackagingDataCalculator.java:113)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.populateFrames(PackagingDataCalculator.java:105)
	at ch.qos.logback.classic.spi.PackagingDataCalculator.calculate(PackagingDataCalculator.java:57)
	at ch.qos.logback.classic.spi.ThrowableProxy.calculatePackagingData(ThrowableProxy.java:147)
	at ch.qos.logback.classic.spi.LoggingEvent.<init>(LoggingEvent.java:124)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:440)
	at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:396)
	at ch.qos.logback.classic.Logger.warn(Logger.java:713)
	at io.netty.util.internal.logging.Slf4JLogger.warn(Slf4JLogger.java:151)
	at io.netty.channel.nio.NioEventLoop.handleLoopException(NioEventLoop.java:486)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:469)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)

Cause analysis

this web application instance has been stopped already.
So, you need to restart Tomcat before you can send it, which is the first error condition.
Could not load [io.netty.channel.nio.NioEventLoop].
Look at this, it can't directly deduce the condition of the problem, but it's obviously about loading.

Solution

To sum up the above two points, the popular point is to restart the project (possibly because of direct code modification, reload of the project), and even after the database (login, etc.), the above error reporting information appears. The reason is that when tomcat restarts, the previous tomcat thread has not been completely shut down, and the latest tomcat start will report this exception.

4,org.apache.dubbo.remoting.TimeoutException

Caused by: org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2019-07-04 15:05:41.363, end time: 2019-07-04 15:05:51.388, client elapsed: 94 ms, server elapsed: 9931 ms, timeout: 10000 ms, request: Request [id=0, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=find, parameterTypes=[class ue.biz.entity.sys.Permission$Type], arguments=[url], attachments={path=ue.biz.service.sys.PermissionService, interface=ue.biz.service.sys.PermissionService, version=0.0.0, timeout=10000}]], channel: /192.168.0.46:54424 -> /192.168.0.46:20880
	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:296) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:191) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:164) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:108) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:156) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:88) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:49) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:54) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:73) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:77) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56) ~[dubbo-2.7.0.jar:2.7.0]
	at org.apache.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:80) ~[dubbo-2.7.0.jar:2.7.0]
	... 65 common frames omitted

Cause analysis

org.apache.dubbo.remoting.TimeoutException: Waiting server-side response timeout by scan timer. start time: 2019-07-04 15:05:41.363, end time: 2019-07-04 15:05:51.388, client elapsed: 94 ms, server elapsed: 9931 ms, timeout: 10000 ms, request: Request [id=0, version=2.0.2, twoway=true, event=false, broken=false, data=RpcInvocation [methodName=find, parameterTypes=[class ue.biz.entity.sys.Permission$Type], arguments=[url], attachments={path=ue.biz.service.sys.PermissionService

Solution

Increase timeout in dubbo-provider.xml

<dubbo:provider delay="-1" timeout="10000" retries="0"/>

Posted by CantonWeb on Thu, 18 Jul 2019 20:00:27 -0700

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