Things to Know When Writing Azure Functions in Java

01-kill-process.sh

process_id=$(sudo lsof -nP -i4TCP:7071 | grep LISTEN | awk '{print $2}')
sudo kill -9 $process_id

02-pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    ...
    <properties>
        ...
        <java.version>1.8</java.version>
        <javaVersion>8</javaVersion>
        ...
    </properties>
    ...
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.microsoft.azure</groupId>
                <artifactId>azure-functions-maven-plugin</artifactId>
                <version>${azure.functions.maven.plugin.version}</version>
                <configuration>
                    ...
                    <runtime>
                        <!-- runtime os, could be windows, linux or docker-->
                        <os>windows</os>
                        <javaVersion>${javaVersion}</javaVersion>
                        ...
                    </runtime>
                ...
            </plugin>
            ...
        </plugins>
    </build>
</project>

03-functionapp.bicep

resource <symbolic-name> 'Microsoft.Web/sites@2021-02-01' = {
    ...
    properties: {
        ...
        siteConfig: {
            ...
            // Linux plan only
            linuxFxVersion = 'Java|11'

            // Windows Plan only
            javaVersion = '11'
        }
    }
}