For typical Azure Function example go here. This is Spring Boot example for Azure Function.

Enter the proper values in the following properties <start-class> is crucial properties to have. If you don't set it, Azure Function service will not know the Main Class and fail to start the function

• For deployment to Azure, following plugin is essential

           <plugin>
                <groupId>com.microsoft.azure</groupId>
                <artifactId>azure-functions-maven-plugin</artifactId>
                <version>${azure.functions.maven.plugin.version}</version>

                <configuration>
            ...
                </configuration>
           </plugin>

• Also, requires host.json file and local.settings.json file in /src/main/resources directory

• One thing to note is it uses ANONYMOUS option, so it can be access without Access Key

    @FunctionName("httpWithName")
    public String httpWithNameMethod(
            @HttpTrigger(name = "req", methods = { HttpMethod.GET, HttpMethod.POST }, 
                    authLevel = AuthorizationLevel.ANONYMOUS
            ) HttpRequestMessage<Optional<String>> request,
            ExecutionContext context) {

first run the maven package command mvn clean package then deploy with maven-azure command mvn azure-functions:deploy

It will bring up OAuth login screen. Login with Microsoft Login ID. Then select subscription if you have more than 1 subscription on Azure. Then it will show the message that deployment is completed and show the functions link.