三、Dubbo注册中心剖析（一）---实操篇_org.apache.dubbo.mock.api.mockservice

1、下载Dubbo源码地址

https://github.com/apache/dubbo.git

2、下载Dubbo Admin源码地址

https://github.com/apache/dubbo-admin.git
（Dubbo Admin是一款为了Dubbo定制的监控运维平台）

3、启动Dubbo Admin

参考文档：dubbo-admin编译部署

3.1、修改配置文件

主要内容为修改配置文件:
/Users/****/dubbo-admin/dubbo-admin-server/src/main/resources/application.properties

# 注册中心地址
admin.registry.address=zookeeper://127.0.0.1:2181
# 配置中心地址
admin.config-center=zookeeper://127.0.0.1:2181
# 元数据中心地址
admin.metadata-report.address=zookeeper://127.0.0.1:2181

# 用户名
admin.root.user.name=root
#密码
admin.root.user.password=root

# session回话超时时间
admin.check.sessionTimeoutMilli=3600000

# admin启动占用的端口号
server.port=10010
server.compression.enabled=true
server.compression.mime-types=text/css,text/javascript,application/javascript
server.compression.min-response-size=10240
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3.2 、执行编译

3.2.1 方式一

1. 在dubbo-admin根目录下执行：mvn clean package
2. 找到编译以后的jar包：dubbo-admin/dubbo-admin-distribution/target
3. 执行 java -jar xxx.jar

3.2.2 方式二

1. 在dubbo-admin根目录下执行：mvn clean compile -U
2. 在dubbo-admin根目录下执行：mvn --projects dubbo-admin-server spring-boot:run

3.2.3 如果有报错(No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK)

[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.0:compile (default-compile) on project dubbo-admin-server: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :dubbo-admin-server


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原因是环境变量没有配置JAVA_HOME

解决方式：
获取JAVA的安装路径：

/usr/libexec/java_home -V
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添加JAVA_HOME到profile（mac下编辑profile）

vi ~/.bash_profile
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添加环境变量

JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home"
export JAVA_HOME
PATH=$PATH:$JAVA_HOME/bin
export PATH
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保存并生效

source ~/.bash_profile
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重新执行编译命令

3.2.4 如果prodiver启动有报错（Address already in use）

ERROR (SpringApplication.java:847)- Application run failed
org.apache.dubbo.rpc.RpcException: Fail to start server(url: dubbo://30.96.216.200:20880/com.jiangzheng.course.dubbo.api.service.ServiceDemo?anyhost=true&application=provider&bind.ip=30.96.216.200&bind.port=20880&channel.readonly.sent=true&codec=dubbo&default=true&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&heartbeat=60000&interface=com.jiangzheng.course.dubbo.api.service.ServiceDemo&metadata-type=remote&methods=getName,getSelf&pid=76761&release=3.0.0.preview&side=provider&timestamp=1640746962428) Failed to bind NettyServer on /30.96.216.200:20880, cause: Address already in use
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:348)
	...
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325)
	at com.jiangzheng.course.dubbo.provider.DubboProviderApplication.main(DubboProviderApplication.java:12)
Caused by: org.apache.dubbo.remoting.RemotingException: Failed to bind NettyServer on /30.96.216.200:20880, cause: Address already in use
	at org.apache.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:77)
	...
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:346)
	... 38 common frames omitted

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原因：dubbo协议默认在20880端口暴露服务，又因为在dubbo-admin项目中有 org.apache.dubbo.mock.api.MockService

dubbo-admin中的org.apache.dubbo.mock.api.MockService会占用20880端口，所以导致prodiver的接口暴露的默认端口被占用
解决方式：
在prodiver项目的springContext-dubbo.xml文件中修改暴露端口号：

<dubbo:protocol name="dubbo" port="29014" />
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