CzyerChen commented on issue #2883:
URL: https://github.com/apache/skywalking/issues/2883#issuecomment-1670979295
I got the problem, and solved in this way.
1. remove related submodule dirs which you can see from config file.
some of them may be blank.
.gitmodules
```text
[submodule "apm-protocol/apm-network/src/main/proto"]
path = apm-protocol/apm-network/src/main/proto -----here
url = https://github.com/apache/skywalking-data-collect-protocol.git
[submodule
"oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol"]
path =
oap-server/server-query-plugin/query-graphql-plugin/src/main/resources/query-protocol
-----here
url = https://github.com/apache/skywalking-query-protocol.git
[submodule "test/e2e-v2/java-test-service/e2e-protocol/src/main/proto"]
path = test/e2e-v2/java-test-service/e2e-protocol/src/main/proto
-----here
url = https://github.com/apache/skywalking-data-collect-protocol.git
[submodule "skywalking-ui"]
path = skywalking-ui -----here
url = https://github.com/apache/skywalking-booster-ui.git
```
2. do `git submodule init` and `git submodule update` again. Make sure that
the submodule dirs are not blank
3. then follow the instruction to do `./mvnw clean package
-Dmaven.test.skip`.
Hope you success
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