JAVA高级面试进阶训练营视频教程

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一、异常记录

1、2017-05-24 09:58:43.639  INFO 1264 --- [127.0.0.1:2181)] org.apache.zookeeper.ClientCnxn          : Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

2017-05-24 09:58:43.642  WARN 1264 --- [127.0.0.1:2181)] org.apache.zookeeper.ClientCnxn          : Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

 

java.net.ConnectException: Connection refused

    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_73]

    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_73]

    at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361) ~[zookeeper-3.4.8.jar:3.4.8--1]

    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141) ~[zookeeper-3.4.8.jar:3.4.8--1]

=> zookeeper 未启动导致， 启动zookeeper即可

$ zkServer start

$ zkServer status

 

2、

Description:

A component required a bean named 'userService' that could not be found.

Action:

Consider defining a bean named 'userService' in your configuration.

在provider的接口实现类中未注解通用接口

=>

@Service("userService")

public class UserServiceImpl implements UserService{...}

 

3、java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@65c7a252: startup date [Wed May 24 10:02:26 CST 2017]; root of context hierarchy

    at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:404) [spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1033) [spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:555) [spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

    at com.patty.dubbo.consumer.ConsumerServer.main(ConsumerServer.java:16) [classes/:na]

 

2017-05-24 10:02:31.428 ERROR 1329 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Destroy method on bean with name 'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor' threw an exception

 

=> dubbo存在jar包冲突

org.springframework.boot -> 1.5.2.RELEASE

dubbo.version -> 2.5.3

<!-- dubbo  -->

<dependency>

    <groupId>com.alibaba</groupId>

    <artifactId>dubbo</artifactId>

    <version>${dubbo.version}</version>

    <exclusions>

        <exclusion>

            <groupId>org.springframework</groupId>

            <artifactId>spring</artifactId>

        </exclusion>

    </exclusions>

</dependency>

4、

com.alibaba.dubbo.remoting.RemotingException: client(url: dubbo://183.207.232.253:20880/com.patty.dubbo.api.service.UserService?anyhost=true&application=dubbo-demo-consumer&check=false&codec=dubbo&dubbo=2.5.3&heartbeat=60000&interface=com.patty.dubbo.api.service.UserService&methods=findUserById,findAllUsers&pid=924&retries=5&side=consumer&timeout=10000&timestamp=1495638102607) failed to connect to server /183.207.232.253:20880, error message is:Connection refused

    at com.alibaba.dubbo.remoting.transport.netty.NettyClient.doConnect(NettyClient.java:124) ~[dubbo-2.5.3.jar:2.5.3]

    at com.alibaba.dubbo.remoting.transport.AbstractClient.connect(AbstractClient.java:280) ~[dubbo-2.5.3.jar:2.5.3]

    at com.alibaba.dubbo.remoting.transport.AbstractClient$1.run(AbstractClient.java:145) ~[dubbo-2.5.3.jar:2.5.3]

    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_73]

    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_73]

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_73]

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [na:1.8.0_73]

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_73]

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_73]

    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_73]

=>

provider方注册的dubbo服务地址为：183.207.232.253:20880

consumer方注册的dubbo服务地址为：183.207.232.253:20880

 

5

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: No constructor found in com.patty.dubbo.provider.model.User matching [java.lang.String, java.lang.String, java.lang.Integer, java.lang.String]

=> public User(){

 

}