dapr sample for java

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Updates

• Update dapr verison 1.5.0 to 1.8.0
• Update Java version 11 to 17
• Update Spring Boot version

Intro

This is a simple sample that receives HTTP communication from outside the company at the Frontend (Spring Boot) and passes it to the BackEnd (Spring Booot). It uses a State Store to maintain state.

+-------------+        +-------------+
| FrontEnd    | -----> | BackEnd     | --> (StateStore)
+-------------+        +-------------+

Dapr

Install Dapr CLI.

Install the Dapr CLI | Dapr Docs

When reconfiguring the environment, uninstall and then initialize.

dapr unisntall --all
dapr init

Do a docker ps and if you see the following, you are good to go.

$ docker ps
CONTAINER ID   IMAGE               COMMAND                  CREATED          STATUS                    PORTS                              NAMES
be8a72b20325   daprio/dapr:1.5.0   "./placement"            14 seconds ago   Up 13 seconds             0.0.0.0:50005->50005/tcp           dapr_placement
6f683eb77d97   redis               "docker-entrypoint.s…"   14 seconds ago   Up 12 seconds             0.0.0.0:6379->6379/tcp             dapr_redis
0c08eafb6574   openzipkin/zipkin   "start-zipkin"           14 seconds ago   Up 12 seconds (healthy)   9410/tcp, 0.0.0.0:9411->9411/tcp   dapr_zipkin

Local execution

1. Build with make all
2. Run run1.sh and run2.sh, respectively.
3. State Store uses redis.

The scripts are as follows, respectively.

frontend

dapr run --app-id frontend --app-port 8080 --dapr-http-port 3500 \
  --components-path ./frontend/components \
  -- java -jar frontend/target/frontend-0.0.1-SNAPSHOT.jar com.example.dapr.frontend.FrontEndApplication --server.port=8080

backend

dapr run --app-id backend --app-port 8888 --dapr-http-port 3501 \
  --components-path ./backend/components/dev \
  -- java -jar backend/target/backend-0.0.1-SNAPSHOT.jar com.example.dapr.backend.BackEndApplication --server.port=8888

run locally

curl http://localhost:8080/test?name=dapr

Container App

Build container images

1. Rename the image in docker-compose.yml appropriately and build the image with make all images. Then, register it in your container registry.
2. For Azure Container Registry, login with az acr login --name myregistry and make push.

Execution

See the following link on how to do this in containerapps.

Tutorial: Deploy a Dapr application to Azure Container Apps using the Azure CLI | Microsoft Docs

Prepare a BLOB as a State Store and write the account name, key and container in backend\components\storage.yaml. This is used when deploying.

az storage account create \
  --name $STORAGE_ACCOUNT \
  --resource-group $RESOURCE_GROUP \
  --location "$LOCATION" \
  --sku Standard_RAGRS \
  --kind StorageV2

After creating a container environment, deploy it with the following command.

backend

az containerapp create \
  --name backend \
  --resource-group $RESOURCE_GROUP \
  --environment $CONTAINERAPPS_ENVIRONMENT \
  --image morisacr.azurecr.io/dapr-sample-backend:latest \
  --target-port 8080 \
  --ingress 'internal' \
  --min-replicas 1 \
  --max-replicas 1 \
  --enable-dapr \
  --dapr-app-port 8080 \
  --dapr-app-id backend \
  --dapr-components backend/components/production/storage.yaml \
  --registry-login-server $ACR_SERVER --registry-username $ACR_USER --registry-password $ACR_PASSWORD

frontend

az containerapp create \
  --name frontend \
  --resource-group $RESOURCE_GROUP \
  --environment $CONTAINERAPPS_ENVIRONMENT \
  --image morisacr.azurecr.io/dapr-sample-frontend:latest \
  --target-port 8080 \
  --ingress 'external' \
  --min-replicas 1 \
  --max-replicas 1 \
  --enable-dapr \
  --dapr-app-port 8080 \
  --dapr-app-id frontend \
  --registry-login-server $ACR_SERVER --registry-username $ACR_USER --registry-password $ACR_PASSWORD