Hi All I am new to wiremock stuff I am able to bring up wiremock server and running in my local with GRPC extension

INSML-VJD2V5L9 shared-service-wiremock % docker run -p 8080:8080 -p 8081:8080 my-grpc-wiremock-simulator
Jun 11, 2025 4:23:37 PM wiremock.com.google.protobuf.Descriptors$DescriptorPool lookupSymbol
WARNING: The descriptor for message type ".google.protobuf.Struct" cannot be found and a placeholder is created for it
Jun 11, 2025 4:23:37 PM wiremock.com.google.protobuf.Descriptors$DescriptorPool lookupSymbol
WARNING: The descriptor for message type ".google.protobuf.Empty" cannot be found and a placeholder is created for it

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----------------------------------------------------------------
|               Cloud: <https://wiremock.io/cloud>               |
|                                                              |
|               Slack: <https://slack.wiremock.org>              |
----------------------------------------------------------------

version:                      3.13.0
port:                         8080
enable-browser-proxying:      false
disable-banner:               false
no-request-journal:           false
verbose:                      false

extensions:                   grpc,response-template,webhook

I have created stub also like this

{
  "request": {
    "method": "POST",
    "url": "/crdcagent.v1.CrdcAgentCrudService/CreateCrd",
    "headers": {
      "Content-Type": {
        "matches": "application/grpc.*"
      }
    },
    "bodyPatterns": [
      {
        "equalToJson": {
          "name": "my-new-crd",
          "version": "v1",
          "plural": "mycrds",
          "crdData": {
            "kind": "MyCrd",
            "apiVersion": "v1alpha1",
            "spec": {
              "groups": [
                "group1"
              ],
              "versions": [
                {
                  "name": "v1",
                  "served": true,
                  "storage": true
                }
              ],
              "scope": "Namespaced",
              "validation": {
                "openAPIV3Schema": {
                  "type": "object",
                  "properties": {
                    "spec": {
                      "type": "object",
                      "properties": {
                        "minReplicas": {
                          "type": "integer",
                          "minimum": 1
                        }
                      }
                    }
                  }
                }
              }
            }
          },
          "updateIfExist": true
        },
        "ignoreArrayOrder": true,
        "ignoreExtraElements": true
      }
    ]
  },
  "response": {
    "status": 200,
    "jsonBody": {},
    "headers": {
      "Content-Type": "application/grpc",
      "grpc-status": "0"
    }
  }
}

When i trigger grpccurl

grpcurl -plaintext \
      -proto crdcagent.proto \
      -d '{
        "name": "my-new-crd",
        "version": "v1",
        "plural": "mycrds",
        "crdData": {
          "kind": "MyCrd",
          "apiVersion": "v1alpha1",
          "spec": {
            "groups": ["group1"],
            "versions": [
              {"name": "v1", "served": true, "storage": true}
            ],
            "scope": "Namespaced",
            "validation": {
              "openAPIV3Schema": {
                "type": "object",
                "properties": {
                  "spec": {
                    "type": "object",
                    "properties": {
                      "minReplicas": {
                        "type": "integer",
                        "minimum": 1
                      }
                    }
                  }
                }
              }
            }
          }
        },
        "updateIfExist": true
      }' \
      localhost:8080 crdcagent.v1.CrdcAgentCrudService/CreateCrd

Getting this exception

Exception in thread "grpc-default-executor-3" wiremock.com.google.protobuf.InvalidProtocolBufferException: Invalid Struct type.
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.printStruct(JsonFormat.java:924)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.access$1500(JsonFormat.java:685)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl$6.print(JsonFormat.java:811)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.print(JsonFormat.java:737)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.printSingleFieldValue(JsonFormat.java:1242)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.printSingleFieldValue(JsonFormat.java:1107)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.printField(JsonFormat.java:1032)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.print(JsonFormat.java:1010)
	at wiremock.com.google.protobuf.util.JsonFormat$PrinterImpl.print(JsonFormat.java:740)
	at wiremock.com.google.protobuf.util.JsonFormat$Printer.appendTo(JsonFormat.java:344)
	at wiremock.com.google.protobuf.util.JsonFormat$Printer.print(JsonFormat.java:354)
	at org.wiremock.grpc.internal.JsonMessageConverter.lambda$toJson$0(JsonMessageConverter.java:35)
	at com.github.tomakehurst.wiremock.common.Exceptions.uncheck(Exceptions.java:64)
	at org.wiremock.grpc.internal.JsonMessageConverter.toJson(JsonMessageConverter.java:35)
	at org.wiremock.grpc.internal.UnaryServerCallHandler.invoke(UnaryServerCallHandler.java:55)
	at org.wiremock.grpc.internal.UnaryServerCallHandler.invoke(UnaryServerCallHandler.java:33)
	at wiremock.grpc.io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:182)
	at wiremock.grpc.io.grpc.PartialForwardingServerCallListener.onHalfClose(PartialForwardingServerCallListener.java:35)
	at wiremock.grpc.io.grpc.ForwardingServerCallListener.onHalfClose(ForwardingServerCallListener.java:23)
	at wiremock.grpc.io.grpc.ForwardingServerCallListener$SimpleForwardingServerCallListener.onHalfClose(ForwardingServerCallListener.java:40)
	at wiremock.grpc.io.grpc.Contexts$ContextualizedServerCallListener.onHalfClose(Contexts.java:86)
	at wiremock.grpc.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:356)
	at wiremock.grpc.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:861)
	at wiremock.grpc.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
	at wiremock.grpc.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

Could you please suggest proper version for GRPC extension with google protobuf?

What do your proto files look like ?

i just re-create .desc file using this command and used that. its working fine.

protoc \
  --proto_path=. \
  --proto_path=$(YOUR_PROTOBUF_INCLUDE_PATH) \
  --descriptor_set_out=crdcagent.desc \
  --include_imports \
  crdcagent.proto

my proto

// [START declaration]
syntax = "proto3";
package crdcagent.v1;
// [END declaration]

// [START go_declaration]
option go_package = "crdcagent/pb";
// [END go_declaration]

// [START java_declaration]
option java_multiple_files = true;
option java_package = "crdcagent.grpc.pb";
option java_outer_classname = "CrdcAgentProto";
// [END java_declaration]

// [START imports]
import "google/protobuf/empty.proto";
import "google/protobuf/struct.proto";
// [END imports]




service CrdcAgentCrudService {
  rpc CreateCrd(CreateCrdRequest) returns (google.protobuf.Empty) {}
  rpc ReadCrd(ReadCrdRequest) returns (ReadCrdResponse) {}
  rpc UpdateCrd(UpdateCrdRequest) returns (google.protobuf.Empty) {}
  rpc DeleteCrd(DeleteCrdRequest) returns (google.protobuf.Empty) {}
}

// RPC to initiate Create CRD
// Return Status code and details indicating operation result
message CreateCrdRequest {
  //name of the crd
  string name = 1;

  //version number in ConfigGenVersion field
  string version = 2;

  string plural = 3;

  //full crd data
  google.protobuf.Struct crd_data = 4;

  // if crd exists, updates it otherwise creates crd
  bool update_if_exist = 5;

}

// RPC to initiate Update CRD
// Return Status code and details indicating operation result
message UpdateCrdRequest {
  //name of the crd
  string name = 1;

  //version number in ConfigGenVersion field
  string version = 2;

  string plural = 3;

  //full crd data
  google.protobuf.Struct crd_data = 4;

  // if crd does not exist, creates it otherwise updates it
  bool create_if_not_exist = 5;

}

message DeleteCrdRequest {
  // name of the crd to delete
  string name = 1;

  string plural = 2;

}

// RPC to initiate Read CRD
// Return Status code and details indicating operation result
message ReadCrdRequest {
  // name of the crd to delete
  string name = 1;

  string plural = 2;
}

message ReadCrdResponse {
  // spec of the crd
  google.protobuf.Struct crd_data = 1;
}

Sorry, are you saying it is working now? I think we normally use the .dsc extension rather than .desc. Which one did you use first ?

i used .dsc before and changed to .desc. after that its start working.

That is very strange. Glad it is working either way