master分支下的helloworld示例正常，但是java_interop/protobuf-triple/java/java-client无法运行

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验证master分支下的java_interop项目时不断遇到问题：

1. 执行java_interop/protobuf-triple/java/java-client的run.sh报错，请教该怎么解决？
   maven输出的具体错误如下，看起来可能是因为缺少jar：
   `[ERROR] PROTOC FAILED: Error: Could not find or load main class org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
   Caused by: java.lang.ClassNotFoundException: org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
   --dubbo_out: protoc-gen-dubbo: Plugin failed with status code 1.

[ERROR] /.../dubbo-go-samples-main/java_interop/protobuf-triple/java/java-client/src/main/proto/greet.proto [0:0]: Error: Could not find or load main class org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
Caused by: java.lang.ClassNotFoundException: org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
--dubbo_out: protoc-gen-dubbo: Plugin failed with status code 1`

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2. 另外，这个实例，也就是dubbo-go-samples-main/helloworld/go-server/cmd这个go server端能正常启动，但是根据其README.md中提示的下面的命令验证该server是否正常时，报404 page not found，说明下面这个命令也有问题，同问该怎么解决？
   具体命令如下：
   curl --header "Content-Type: application/json" --data '{"name": "Dubbo"}' http://localhost:50052/org.apache.dubbo.sample.Greeter/sayHello

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java_interop/protobuf-triple/java下面的java-server和java-client都不能通过各自自带的run.sh成功编译，都报下面的错误：
[ERROR] PROTOC FAILED: Error: Could not find or load main class org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
Caused by: java.lang.ClassNotFoundException: org.apache.dubbo.gen.tri.Dubbo3TripleGenerator
--dubbo_out: protoc-gen-dubbo: Plugin failed with status code 1.

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解决上面的问题后又遇到下面的问题，怎么解决？
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.1.0:java (default-cli) on project java-client: An exception occurred while executing the Java class. UNIMPLEMENTED : invalid content-type: text/plain; charset=utf-8 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.1.0:java (default-cli) on project java-client: An exception occurred while executing the Java class. UNIMPLEMENTED : invalid content-type: text/plain; charset=utf-8

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这个示例的Java-server和java-client之间不能互通，存在的问题：
[DUBBO] can not found commandContext, url: /org.apache.dubbo.sample.Greeter/sayHello, dubbo version: 3.1.7, current host: 172.21.0.1, error code: 7-6. This may be caused by , go to https://dubbo.apache.org/faq/7/6 to find instructions.
还有：
An exception occurred while executing the Java class. Failed to check the status of the service org.apache.dubbo.sample.Greeter. No provider available for the service org.apache.dubbo.sample.Greeter from the url consumer://localhost?application=dubbo-test&background=false&interface=org.apache.dubbo.sample.Greeter&pid=115129&register.ip=172.21.0.1&side=consumer&sticky=false&timeout=3000&unloadClusterRelated=false to the consumer 172.21.0.1 use dubbo version 3.1.7

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closed