Create Azure Functions in Java

Microsoft documentation ["Create your first function using Java and Maven (preview)"]( I tried java-maven) in the following environment.

Since it worked safely, the following memo.

Install Azure Functions Core Tools

I installed Azure Functions Core Tools by referring to Documentation. According to the procedure, I first installed .NET Core.

Download the .NET Core SDK at the .NET Core Download Page ( 2018-09-16_12h36_38.png

Proceed with the installation. 2018-09-16_12h39_37.png

Installation is complete. 2018-09-16_12h45_16.png

Install Azure Functions Core Tools with npm. My environment used npm 5.6.0 which was already installed.

npm install -g [email protected]

Create a template with azure-functions-archetype

Create a template using Maven's "azure-functions-archetypes".

In VS Code, select ** "View" **-> ** "Command Palette" ** and then ** "Maven: Generate from Maven Archetype" ** to select the destination folder. 2018-09-17_21h09_55.png

** Select "azure-functions-archetype" **. 2018-09-17_21h11_09.png

Then, the following processing will start automatically.

PS D:\web\azure\AzureFunctionsJava> cmd /c mvn archetype:generate -DarchetypeArtifactId="azure-functions-archetype" -DarchetypeGroupId=""
[INFO] Scanning for projects...
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO] >>> maven-archetype-plugin:3.0.1:generate (default-cli) > generate-sources @ standalone-pom >>>
[INFO] <<< maven-archetype-plugin:3.0.1:generate (default-cli) < generate-sources @ standalone-pom <<<
[INFO] --- maven-archetype-plugin:3.0.1:generate (default-cli) @ standalone-pom ---
[INFO] Generating project in Interactive mode
[INFO] Archetype [] found in catalog remote
Downloading from central:
Downloaded from central: (1.5 kB at 4.3 kB/s)
Downloading from central:
Downloaded from central: (15 kB at 44 kB/s)

Set to interactive. Here, only groupId and artifactId are specified, and the rest is left blank by default.

Define value for property 'groupId' (should match expression '[A-Za-z0-9_\-\.]+'): tech.kikutaro
[INFO] Using property: groupId = tech.kikutaro
Define value for property 'artifactId' (should match expression '[A-Za-z0-9_\-\.]+'): AzureFunctionsJava
[INFO] Using property: artifactId = AzureFunctionsJava
Define value for property 'version' 1.0-SNAPSHOT: :
Define value for property 'package' tech.kikutaro: :
Define value for property 'appName' azurefunctionsjava-20180917211315850: :
Define value for property 'appRegion' westus: :
Define value for property 'resourceGroup' java-functions-group: :
Confirm properties configuration:
groupId: tech.kikutaro
groupId: tech.kikutaro
artifactId: AzureFunctionsJava
artifactId: AzureFunctionsJava
version: 1.0-SNAPSHOT
package: tech.kikutaro
appName: azurefunctionsjava-20180917211315850
appRegion: westus
resourceGroup: java-functions-group
 Y: : Y
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Archetype: azure-functions-archetype:1.15
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: tech.kikutaro
[INFO] Parameter: artifactId, Value: AzureFunctionsJava
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: package, Value: tech.kikutaro
[INFO] Parameter: packageInPathFormat, Value: tech/kikutaro
[INFO] Parameter: appName, Value: azurefunctionsjava-20180917211315850
[INFO] Parameter: resourceGroup, Value: java-functions-group
[INFO] Parameter: package, Value: tech.kikutaro
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: groupId, Value: tech.kikutaro
[INFO] Parameter: appRegion, Value: westus
[INFO] Parameter: artifactId, Value: AzureFunctionsJava
[INFO] Project created from Archetype in dir: D:\web\azure\AzureFunctionsJava\AzureFunctionsJava
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:20 min
[INFO] Finished at: 2018-09-17T21:13:37+09:00
[INFO] ------------------------------------------------------------------------

This completes the template. Although it is called a template, the following code is written, so you can move it as it is.

package tech.kikutaro;

import java.util.*;

 * Azure Functions with HTTP Trigger.
public class Function {
     * This function listens at endpoint "/api/HttpTrigger-Java". Two ways to invoke it using "curl" command in bash:
     * 1. curl -d "HTTP Body" {your host}/api/HttpTrigger-Java
     * 2. curl {your host}/api/HttpTrigger-Java?name=HTTP%20Query
    public HttpResponseMessage run(
            @HttpTrigger(name = "req", methods = {HttpMethod.GET, HttpMethod.POST}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
            final ExecutionContext context) {
        context.getLogger().info("Java HTTP trigger processed a request.");

        // Parse query parameter
        String query = request.getQueryParameters().get("name");
        String name = request.getBody().orElse(query);

        if (name == null) {
            return request.createResponseBuilder(HttpStatus.BAD_REQUEST).body("Please pass a name on the query string or in the request body").build();
        } else {
            return request.createResponseBuilder(HttpStatus.OK).body("Hello, " + name).build();

Local operation check


mvn clean package

Below, some download parts are omitted.

[INFO] Scanning for projects...
[INFO] ------------------< tech.kikutaro:AzureFunctionsJava >------------------
[INFO] Building Azure Java Functions 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ AzureFunctionsJava ---
[INFO] Deleting D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ AzureFunctionsJava ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\src\main\resources
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ AzureFunctionsJava ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\classes
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ AzureFunctionsJava ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\src\test\resources
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ AzureFunctionsJava ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\test-classes
[WARNING] /D:/web/azure/AzureFunctionsJava/AzureFunctionsJava/src/test/java/tech/kikutaro/ D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\src\test\java\tech\kikutaro\FunctionTest.Java operations are unchecked or unsafe.
[WARNING] /D:/web/azure/AzureFunctionsJava/AzureFunctionsJava/src/test/java/tech/kikutaro/ is,-Xlint:Recon with the unchecked option
Please pile.
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ AzureFunctionsJava ---
[INFO] Surefire report directory: D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\surefire-reports

 T E S T S
Running tech.kikutaro.FunctionTest
9 17, 2018 9:25:20 pm tech.kikutaro.Function run
information: Java HTTP trigger processed a request.
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.302 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] --- maven-dependency-plugin:3.1.1:copy-dependencies (copy-dependencies) @ AzureFunctionsJava ---
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ AzureFunctionsJava ---
[INFO] Building jar: D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\AzureFunctionsJava-1.0-SNAPSHOT.jar
[INFO] --- azure-functions-maven-plugin:1.0.0-beta-6:package (package-functions) @ AzureFunctionsJava ---
Downloading from central:
AI: INFO 17-09-2018 21:27, 1: Configuration file has been successfully found as resource
AI: INFO 17-09-2018 21:27, 1: Configuration file has been successfully found as resource
[INFO] Step 1 of 7: Searching for Azure Functions entry points
[INFO] 1 Azure Functions entry point(s) found.
[INFO] Step 2 of 7: Generating Azure Functions configurations
[INFO] Generation done.
[INFO] Step 3 of 7: Validating generated configurations
[INFO] Validation done.
[INFO] Step 4 of 7: Saving empty host.json
[INFO] Successfully saved to D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850\host.json
[INFO] Step 5 of 7: Saving configurations to function.json
[INFO] Starting processing function: HttpTrigger-Java
[INFO] Successfully saved to D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850\HttpTrigger-Java\function.json
[INFO] Step 6 of 7: Copying JARs to staging directoryD:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource to D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850
[INFO] Copied successfully.
[INFO] Step 7 of 7: Installing function extensions if needed
  Writing C:\Users\kikuta\AppData\Local\Temp\tmpC1CE.tmp
info :package'Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator'PackageReference project'D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.csproj'I am adding to.
log  : D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.Restoring the csproj package...
info :package'Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator'Is a project'D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.csproj'Compatible with all specified frameworks of.
info :package'Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator'version'1.0.0'PackageReference is a file'D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.csproj'Updated with.

.Microsoft for .NET Core(R)Build Engine version 15.8.166+gd4e8d81a88
Copyright (C) Microsoft Corporation.All rights reserved.

  D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.Restoring the csproj package...
MSBuild File D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\obj\extensions.csproj.nuget.g.Generating props.
MSBuild File D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\obj\extensions.csproj.nuget.g.Generating targets.
  D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\extensions.Restoration of csproj is 971.Completed in 41 ms.
  extensions -> D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850\bin\extensions.dll

The build was successful.
0 warnings
0 error

Elapsed time 00:00:17.67

[INFO] Function extension installation done.
[INFO] Successfully built Azure Functions.
[INFO] --- maven-resources-plugin:3.1.0:copy-resources (copy-resources) @ AzureFunctionsJava ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 03:07 min
[INFO] Finished at: 2018-09-17T21:28:15+09:00
[INFO] ------------------------------------------------------------------------

I will do it.

mvn azure-functions:run
[INFO] Scanning for projects...
[INFO] ------------------< tech.kikutaro:AzureFunctionsJava >------------------
[INFO] Building Azure Java Functions 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] --- azure-functions-maven-plugin:1.0.0-beta-6:run (default-cli) @ AzureFunctionsJava ---
AI: INFO 17-09-2018 22:00, 1: Configuration file has been successfully found as resource
AI: INFO 17-09-2018 22:00, 1: Configuration file has been successfully found as resource
[INFO] Azure Function App's staging directory found at: D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850
[INFO] Azure Functions Core Tools found.

            @   %%%%%%    @
          @@   %%%%%%      @@
       @@@    %%%%%%%%%%%    @@@
     @@      %%%%%%%%%%        @@
       @@         %%%%       @@
         @@      %%%       @@
           @@    %%      @@

Azure Functions Core Tools (2.0.1-beta.38)
Function Runtime Version: 2.0.12050.0
Skipping 'AzureWebJobsStorage' from local settings as it's already defined in current environment variables.
Skipping 'AzureWebJobsDashboard' from local settings as it's already defined in current environment variables.
info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0]
      User profile is available. Using 'C:\Users\kikuta\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest.
info: Host.Startup[0]
      Reading host configuration file 'D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850\host.json'info: Host.Startup[0]
      Host configuration file read:
        "version": "2.0"
[2018/09/17 13:00:43] Initializing Host.
[2018/09/17 13:00:43] Host initialization: ConsecutiveErrors=0, StartupCount=1
[2018/09/17 13:00:44] Starting JobHost
[2018/09/17 13:00:44] Starting Host (HostId=xxxxxxxxx-xxxxxxxx, InstanceId=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, Version=2.0.12050.0, ProcessId=11372, AppDomainId=1, Debug=False, FunctionsExtensionVersion=)
[2018/09/17 13:00:44] Starting language worker process:C:\Program Files\Java\jdk1.8.0_152\bin\java  -jar "C:\Users\kikuta\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\java\azure-functions-java-worker.jar" --host --port 36887 --workerId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --requestId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx --grpcMaxMessageLength 134217728
[2018/09/17 13:00:44] C:\Program Files\Java\jdk1.8.0_152\bin\java process with Id=26080 started
[2018/09/17 13:00:44] Generating 1 job function(s)
[2018/09/17 13:00:44] Found the following functions:
[2018/09/17 13:00:44] Host.Functions.HttpTrigger-Java
[2018/09/17 13:00:44]
[2018/09/17 13:00:44] Host initialized (678ms)
[2018/09/17 13:00:44] Host started (695ms)
[2018/09/17 13:00:44] Job host started
Hosting environment: Production
Content root path: D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850
Now listening on:
Application started. Press Ctrl+C to shut down.
Listening on
Hit CTRL-C to exit...

Http Functions:

        HttpTrigger-Java: http://localhost:7071/api/HttpTrigger-Java

[2018/09/17 13:00:45] Microsoft Azure Functions Java Runtime [build 1.1.0-beta9]
[2018/09/17 13:00:49] [INFO] {MessageHandler.handle}: Message generated by "StartStream.Builder"
[2018/09/17 13:00:49] Host lock lease acquired by instance ID '0000000000000000000000000xxxxxxx'.
[2018/09/17 13:00:57] Worker initialized
[2018/09/17 13:00:57] "HttpTrigger-Java" loaded (ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, Reflection: "D:\web\azure\AzureFunctionsJava\AzureFunctionsJava\target\azure-functions\azurefunctionsjava-20180917211315850\AzureFunctionsJava-1.0-SNAPSHOT.jar"::"")

When I accessed "http: // localhost: 7071", the following was displayed. 2018-09-16_13h13_14.png

Furthermore, I confirmed the following display at "http: // localhost: 7071 / api / HttpTrigger-Java? Name = kikutaro". 2018-09-16_13h14_27.png

Deploy to Microsoft Azure

Since we were able to confirm the operation locally, we will finally deploy it to Azure. First, log in.

az login


mvn azure-functions:deploy
[INFO] Scanning for projects...
[INFO] ------------------< tech.kikutaro:AzureFunctionsJava >------------------
[INFO] Building Azure Java Functions 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] --- azure-functions-maven-plugin:1.0.0-beta-6:deploy (default-cli) @ AzureFunctionsJava ---
AI: INFO 17-09-2018 22:07, 1: Configuration file has been successfully found as resource
AI: INFO 17-09-2018 22:07, 1: Configuration file has been successfully found as resource
[INFO] Authenticate with Azure CLI 2.0
[INFO] The specified function app does not exist. Creating a new function app...
[INFO] Successfully created the function app: azurefunctionsjava-20180917211315850
[INFO] Trying to deploy the function app...
[INFO] Successfully deployed the function app at
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:59 min
[INFO] Finished at: 2018-09-17T22:09:03+09:00
[INFO] ------------------------------------------------------------------------

If you check in the Azure portal, a resource group with the name specified in Maven is created. 2018-09-17_22h09_57.png

You can check the URL by clicking the created Function. 2018-09-17_22h08_29.png

Check as local. First of all, the top URL. 2018-09-17_22h14_58.png

It behaves the same as local. 2018-09-17_22h14_25.png

It was easier than I expected.

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