Java DataPlane SDK generation failure with error error "java.util.NoSuchElementException: No value present"

[bhargav-kansagara]

I'm trying to generate Java SDK on top of DataPlane Swagger but I'm getting the below error:

`error | Javagen | Failed to generate code.
java.util.NoSuchElementException: No value present
at java.util.Optional.get(Optional.java:135)
at com.azure.autorest.mapper.ClientMethodMapper.createClientMethods(ClientMethodMapper.java:378)
at com.azure.autorest.mapper.ClientMethodMapper.map(ClientMethodMapper.java:110)
at com.azure.autorest.mapper.ClientMethodMapper.map(ClientMethodMapper.java:100)
at com.azure.autorest.mapper.MethodGroupMapper.createMethodGroupClient(MethodGroupMapper.java:122)
at com.azure.autorest.mapper.MethodGroupMapper.map(MethodGroupMapper.java:44)
at com.azure.autorest.mapper.ServiceClientMapper.map(ServiceClientMapper.java:120)
at com.azure.autorest.mapper.ClientMapper.map(ClientMapper.java:143)
at com.azure.autorest.Javagen.processInternal(Javagen.java:83)
at com.azure.autorest.extension.base.plugin.NewPlugin.process(NewPlugin.java:210)
at com.azure.autorest.Main.lambda$main$1(Main.java:15)
at com.azure.autorest.extension.base.jsonrpc.Connection.lambda$dispatch$2(Connection.java:141)
at com.azure.autorest.extension.base.jsonrpc.Connection.lambda$process$3(Connection.java:245)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)

fatal | Process() cancelled due to failure
error | Error: Plugin javagen reported failure.
error | Autorest completed with an error. If you think the error message is unclear, or is a bug, please declare an issues at https://github.com/Azure/autorest/issues with the error message you are seeing.`

Client generation for python, C# & js is working fine, I'm getting this error only in Java client generation. I have tried autorest command autorest --version=3.8.4 --use=@autorest/java@4.1.3 sdk\agrifood\azure-verticals-agrifood-farming\swagger\README.md as well as python script python eng\mgmt\automation\generate_data.py --readme=C:\Users\bhargav-kansagara\azure-sdk-for-java\sdk\agrifood\azure-verticals-agrifood-farming\swagger\README.md but no success.

Could you please let me know if I'm doing anything wrong here? Thanks in advance.

[weidongxu-microsoft]

@bhargav-kansagara

Please remove these 2 options in swagger/README.md (the culprit is sync-methods: none but we almost never set that, this option just say don't generate any method, which is not very meaningful to an SDK)

generate-client-interfaces: false
sync-methods: none

Please note that the current DPG is totally different from the lib that generated years ago. So almost all files will be different. You might want to delete the src folder before generating it.

Ref https://github.com/Azure/azure-sdk-for-java/wiki/Protocol-Methods

[bhargav-kansagara]

Thanks @weidongxu-microsoft, that solved the issue.