Create your first Azure function with Java and IntelliJ
This article shows you:
- How to create a serverless function project with IntelliJ IDEA
- Steps for testing and debugging the function in the integrated development environment (IDE) on your own computer
- Instructions for deploying the function project to Azure Functions
Set up your development environment
To develop a function with Java and IntelliJ, install the following software:
- An Azure account with an active subscription. Create an account for free.
- An Azure supported Java Development Kit (JDK) for Java 8
- An IntelliJ IDEA Ultimate Edition or Community Edition installed
- Maven 3.5.0+
- Latest Function Core Tools
Installation and Sign-in
In IntelliJ IDEA's Settings/Preferences dialog (Ctrl+Alt+S), select Plugins. Then, find the Azure Toolkit for IntelliJ in the Marketplace and click Install. After installed, click Restart to activate the plugin.
To sign in to your Azure account, open sidebar Azure Explorer, and then click the Azure Sign In icon in the bar on top (or from IDEA menu Tools/Azure/Azure Sign in).
In the Azure Sign In window, select Device Login, and then click Sign in (other sign in options).
Click Copy&Open in Azure Device Login dialog .
In the browser, paste your device code (which has been copied when you click Copy&Open in last step) and then click Next.
In the Select Subscriptions dialog box, select the subscriptions that you want to use, and then click OK.
Create your local project
In this section, you use Azure Toolkit for IntelliJ to create a local Azure Functions project. Later in this article, you'll publish your function code to Azure.
Open IntelliJ Welcome dialog, select Create New Project to open a new Project wizard, select Azure Functions.
Select Http Trigger, then click Next and follow the wizard to go through all the configurations in the following pages; confirm your project location then click Finish; Intellj IDEA will then open your new project.
Run the Function App locally
src/main/java/org/example/functions/HttpTriggerFunction.javato see the code generated. Beside the line 17, you will notice that there is a green Run button, click it and select Run 'azure-function-exam...', you will see that your function app is running locally with a few logs.
You can try the function by accessing the printed endpoint from browser, like
The log is also printed out in your IDEA, now, stop the function by clicking the stop button.
Debug the Function App locally
Now let's try to debug your Function App locally, click the Debug button in the toolbar (if you don't see it, click View -> Appearance -> Toolbar to enable Toolbar).
Click on line 20 of the file
src/main/java/org/example/functions/HttpTriggerFunction.javato add a breakpoint, access the endpoint
http://localhost:7071/api/HttpTrigger-Java?name=Azureagain , you will find the breakpoint is hit, you can try more debug features like step, watch, evaluation. Stop the debug session by click the stop button.
Deploy your Function App to Azure
Right click your project in IntelliJ Project explorer, select Azure -> Deploy to Azure Functions
If you don't have any Function App yet, click No available function, click to create a new one.
Type in the Function app name and choose proper subscription/platform/resource group/App Service plan, you can also create resource group/App Service plan here. Then, keep app settings unchanged, click OK and wait some minutes for the new function to be created. After Creating New Function App... progress bar disappears.
Select the function app you want to deploy to, (the new function app you just created will be automatically selected). Click Run to deploy your functions.
Manage Azure Functions from IDEA
You can manage your functions with Azure Explorer in your IDEA, click on Function App, you will see all your functions here.
Click to select on one of your functions, and right click, select Show Properties to open the detail page.
Right click on your Function HttpTrigger-Java, and select Trigger Function, you will see that the browser is opened with the trigger URL.
Add more Functions to the project
Right click on the package org.example.functions and select New -> Azure Function Class.
Fill in the class name HttpTest and select HttpTrigger in the create function class wizard, click OK to create, in this way, you can create new functions as you want.
Cleaning Up Functions
Deleting Azure Functions in Azure Explorer
You've created a Java functions project with an HTTP triggered function, run it on your local machine, and deployed it to Azure. Now, extend your function by...