JAVA高级面试进阶训练营视频教程

admin

问题1：

运行起来不报错，不过在Console没有zookeeper的心跳信息，也就是说没有配置上zookeeper，而出错的原因是下面蓝色这段解析不了

spring-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://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://code.alibabatech.com/schema/dubbo
http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
<!-- 提供方应用信息，用于计算依赖 -->
<dubbo:application name="dubbo-service" />
<!-- 使用zookeeper注册中心暴露服务地址：部署zookeeper控制台的电脑ip -->
<dubbo:registry address="zookeeper://127.0.0.1:2181" />
<!-- 用dubbo协议在20880端口暴露服务 host="192.168.3.53" -->
<dubbo:protocol name="dubbo" host="192.168.3.53" port="20883" />
<!-- 声明需要暴露的服务接口，对应的具体实现类是自定义bean -->
<dubbo:service interface="com.zk1.service.IUserService"
ref="userService" />
<!-- 服务实现 -->
<bean id="userService" class="com.zk1.service.impl.UserServiceImpl" />

</beans>

解决方法：

把 dubbo-2.5.3.jar解压，把解压出来的dubbo.xsd 随便你放一个地方，打开eclipse--》Preferences--》XML--》XML Catalog --》add --》File System 把刚才dubbo.xsd弄进来，再改一下Location下面的Keyhttp://code.alibabatech.com/schema/dubbo 改为 http://code.alibabatech.com/schema/dubbo/dubbo.xsd 然后保存

 

 

 

 

问题2：

2016-12-19 20:20:21 AbstractConfig:301 WARN - [DUBBO] keefer: keefer: unknown error, dubbo version: 2.5.3, current host: 127.0.0.1
java.net.UnknownHostException: keefer: keefer: unknown error
at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
at com.alibaba.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:299)
at com.alibaba.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:281)
at com.alibaba.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:242)
at com.alibaba.dubbo.config.ServiceConfig.export(ServiceConfig.java:143)
at com.alibaba.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:109)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:163)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:136)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:855)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4853)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

解决方法：

在 spring-dubbo-provider.xml 文件里边

<dubbo:protocol name="dubbo" port="20883" />改成下面这个，加上host地址（记着，本人用127.0.0.1测试无效）

<dubbo:protocol name="dubbo" host="192.168.3.53" port="20883" />

 

 

 

问题3：

严重: Exception sending context initialized event to listener instance of class org.springframework.web.util.Log4jConfigListener
java.lang.IllegalStateException: Web app root system property already set to different value: 'webapp.root' = [/home/keefer/JAVA/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/zk1service/] instead of [/home/keefer/JAVA/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/zk1client/] - Choose unique values for the 'webAppRootKey' context-param in your web.xml files!
at org.springframework.web.util.WebUtils.setWebAppRootSystemProperty(WebUtils.java:161)
at org.springframework.web.util.Log4jWebConfigurer.initLogging(Log4jWebConfigurer.java:119)
at org.springframework.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4853)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

解决方法：

将web.xml文件里边的spring监听器

<listener>
<description>spring监听器</description>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

修改成

<listener>
<description>spring监听器</description>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

dubbo消费者这端不用log4j日志配置，去掉就好