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ITNEXT profile image Abhishek Gupta
Abhishek Gupta for ITNEXT

Posted on • Updated on • Originally published at Medium

Tutorial: Deploying Java EE apps on Azure (Part 1)

#azure #java #showdev #tutorial

There are a multitude of options for cloud based application development ranging from traditional IaaS (Infrastructure-as-a-Service), PaaS (Platform-as-a-Service) and CaaS (Containers-as-a-Service) all the way to Kubernetes and Serverless (and probably some more which I might be missing!). Think of it as a spectrum rather than a "one size fits all model", with each option having own its pros and cons. Ultimately, every scenario is unique and the final choice is driven by requirements - but its always good to know that you have "choices" at your disposal!

This is the first of a series of blogs that will walk you through one of the options of running Java EE applications on Azure. We will follow the most basic approach of deploying our Java EE app to an application server which is set up in a Virtual Machine on Microsoft Azure along with the Azure Database for PostgreSQL service as the backend database. In essence, this is the combination of IaaS (Azure VM) along with a PaaS (managed PostgreSQL on Azure)

Other options such as containers and Kubernetes will be covered in upcoming posts

The example used in the blog post is a simple three-tier application that uses Java EE 8 specifications such as JAX-RS, EJB, CDI, JPA, JSF, Bean Validation. We will use the Payara Server to deploy the application and use PostgreSQL as the relational database.

During the course of the tutorial, we will cover:

  • Postgres and Virtual machine setup on Azure
  • Setup Payara server on the Virtual machine
  • Configure and install the Java EE application
  • Explore its functionality

Except for minor changes, the application used in this tutorial has been adapted from this project by Reza Rahman

Pre-requisites

You will need a Microsoft Azure account and the Azure CLI to work through the tutorial.

If you don't have a Microsoft Azure account, go ahead and sign up for a free one!. The Azure CLI is a cross-platform command-line experience for managing Azure resources - please install it using these instructions.

First things first...

Set your Azure Subscription ID using the Azure CLI which will be used for this tutorial.

To set your Azure subscription ID

    export AZURE_SUBSCRIPTION_ID=[to be filled]
    az account set --subscription $AZURE_SUBSCRIPTION_ID
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Create a resource group that will contain all the services (resources) which you will create as a part of this tutorial. A resource group is like a logical container that holds related resources for an Azure solution. The resource group includes those resources that you want to manage as a group.

To create a resource group

    export AZURE_RESOURCE_GROUP_NAME=[to be filled]
    export AZURE_LOCATION=[to be filled]
    az group create --name $AZURE_RESOURCE_GROUP_NAME --location $AZURE_LOCATION
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Install Postgres on Azure

Azure Database for PostgreSQL is a relational database service based on the open-source Postgres database engine. It's a fully managed database-as-a-service offering which is available in two deployment options, as a single server and as a Hyperscale (Citus) cluster

We will be using the single server option for the purposes of this tutorial

We will use the az postgres server create command to create a Postgres server instance on Azure. First, set up some of the server properties such as the name, admin user etc.

    export AZURE_POSTGRES_SERVER_NAME=[to be filled]
    export AZURE_POSTGRES_ADMIN_USER=[to be filled]
    export AZURE_POSTGRES_ADMIN_PASSWORD=[to be filled]
    export SKU=B_Gen5_1
    export STORAGE=5120
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For storage and SKU options, please refer to the documentation

And, then invoke the command to initiate the database instance creation:

    az postgres server create --resource-group $AZURE_RESOURCE_GROUP_NAME --name $AZURE_POSTGRES_SERVER_NAME  --location $AZURE_LOCATION --admin-user $AZURE_POSTGRES_ADMIN_USER --admin-password $AZURE_POSTGRES_ADMIN_PASSWORD --storage-size $STORAGE --sku-name $SKU
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The provisioning process will take a few minutes.

To check the details of the Postgres database instance you just provisioned, invoke az postgres server show command

    az postgres server show --resource-group $AZURE_RESOURCE_GROUP_NAME --name $AZURE_POSTGRES_SERVER_NAME
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You should get a JSON response. Please note down the value for the fullyQualifiedDomainName attribute as you will be using this to connect to the Postgres instance later.

It should be of the format: [AZURE_POSTGRES_DB_NAME].postgres.database.azure.com

Install Virtual Machine on Azure

We will use a Virtual machine on Azure to host the Payara JavaEE application server

To be specific, this will be a Ubuntu based Linux VM

Let's start by setting up the required information for the VM

    export AZURE_VM_NAME=[to be filled]
    export AZURE_VM_USER=[to be filled]
    export AZURE_VM_PASSWORD=[to be filled]
    export VM_IMAGE=UbuntuLTS
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We will use the az vm create command to create the VM instance

    az vm create --resource-group $AZURE_RESOURCE_GROUP_NAME --name $AZURE_VM_NAME --image $VM_IMAGE --admin-username $AZURE_VM_USER --admin-password $AZURE_VM_PASSWORD
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The VM provisioning will take a few minutes.

You need to get the public IP address of the VM. Do so using the az vm list-ip-addresses command

    az vm list-ip-addresses --resource-group $AZURE_RESOURCE_GROUP_NAME --name $AZURE_VM_NAME
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You will see a JSON response - take a look at the publicIpAddresses section and note down the value of ipAddress property. Configure it as an environment variable as you will be using it in the subsequent steps

    export VM_IP=[to be filled]
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Allow VM to access the Postgres database

The Postgres database is not accessible by default. Use the az postgres server firewall-rule create command to create a firewall rule to explicitly allow the VM to access the Postgres instance. This will allow the JavaEE application deployed inside the VM to communicate with Postgres.

    export FIREWALL_RULE_NAME=AllowJavaEECafeAppOnVM

    az postgres server firewall-rule create --resource-group $AZURE_RESOURCE_GROUP_NAME --server $AZURE_POSTGRES_SERVER_NAME --name $FIREWALL_RULE_NAME --start-ip-address $VM_IP --end-ip-address $VM_IP
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Install Payara server on the Virtual Machine

Payara Server is an open source application server derived from GlassFish that supports reliable and secure deployments of Java EE (Jakarta EE) and MicroProfile applications in any environment: on-premise, in the cloud or hybrid. Check out the project on GitHub or dive into its documentation to learn more!

SSH into the Linux VM you just provisioned using the username you specified along with the VM IP

    ssh $AZURE_VM_USER@$VM_IP
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Enter the password once prompted. Once you're logged into the Virtual Machine, proceed with the next steps.

Install required toolset

Before installing the Payara server, we need to setup a few things such as JDK, etc.

    sudo apt-get update
    sudo apt install openjdk-8-jdk
    sudo apt install maven
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Setup Payara server

We are using Payara server version 5.193.1 which is the latest at the time of writing this tutorial. The setup simply involves downloading and extracting the server zip file.

    export PAYARA_VERSION=5.193.1

    wget https://s3-eu-west-1.amazonaws.com/payara.fish/Payara+Downloads/$PAYARA_VERSION/payara-$PAYARA_VERSION.zip
    sudo apt install unzip
    unzip payara-$PAYARA_VERSION.zip
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To confirm, run ls ~/payara5/

Start the server using asadmin

    ~/payara5/bin/asadmin start-domain
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It will take a few moments for the server to boot up. You should see the following logs:

    Waiting for domain1 to start ..................
    Successfully started the domain : domain1
    domain  Location: /home/abhishgu/payara5/glassfish/domains/domain1
    Log File: /home/abhishgu/payara5/glassfish/domains/domain1/logs/server.log
    Admin Port: 4848
    Command start-domain executed successfully.
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Setup and deploy the application

Now that we have the VM as well as Payara server up and running, we can now deploy our application! Clone the git repository

    git clone https://github.com/abhirockzz/javaee-on-azure-iaas
    export APP_FOLDER_NAME=javaee-on-azure-iaas
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The web.xml file (under javaee-on-azure-iaas/src/main/webapp/WEB-INF) needs to be updated with the JDBC URL for the Postgres database on Azure.

This is present in the <url> attribute of the <data-source section and it's format is as follows:

    jdbc:postgresql://POSTGRES_FQDN:5432/postgres?user=AZURE_POSTGRES_ADMIN_USER@=AZURE_POSTGRES_SERVER_NAME&amp;password=AZURE_POSTGRES_ADMIN_PASSWORD&amp;sslmode=require
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Here is the list of placeholders which form a part of the JDBC URL:

  • POSTGRES_FQDN with the value of fullyQualifiedDomainName for Postgres instance
  • AZURE_POSTGRES_ADMIN_USER with the admin user name used to provision PG
  • AZURE_POSTGRES_SERVER_NAME with server name used to provision PG
  • AZURE_POSTGRES_ADMIN_PASSWORD with admin password used to provision PG

Set the required values

    export POSTGRES_FQDN=[to be filled]
    export AZURE_POSTGRES_ADMIN_USER=[to be filled]
    export AZURE_POSTGRES_SERVER_NAME=[to be filled]
    export AZURE_POSTGRES_ADMIN_PASSWORD=[to be filled]
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Simply use these commands to replace

    export FILE_NAME=javaee-on-azure-iaas/src/main/webapp/WEB-INF/web.xml

    sed -i 's/POSTGRES_FQDN/'"$POSTGRES_FQDN"'/g' $FILE_NAME
    sed -i 's/AZURE_POSTGRES_SERVER_NAME/'"$AZURE_POSTGRES_SERVER_NAME"'/g' $FILE_NAME
    sed -i 's/AZURE_POSTGRES_ADMIN_USER/'"$AZURE_POSTGRES_ADMIN_USER"'/g' $FILE_NAME
    sed -i 's/AZURE_POSTGRES_ADMIN_PASSWORD/'"$AZURE_POSTGRES_ADMIN_PASSWORD"'/g' $FILE_NAME
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Here is an e.g. of what the <data-source> section will look like:

    <data-source>
        <name>java:global/JavaEECafeDB</name>
        <class-name>org.postgresql.ds.PGPoolingDataSource</class-name>
        <url>jdbc:postgresql://foobar-pg.postgres.database.azure.com:5432/postgres?user=foobar@foobar-pg&amp;password=foobarbaz&amp;sslmode=require</url>
    </data-source>
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The application is now configured. Let's build it!

    mvn clean install -f $APP_FOLDER_NAME/pom.xml
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You should have the WAR file available. To confirm

    ls -lrt $APP_FOLDER_NAME/target | grep javaee-cafe.war
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As a final step in the application setup process, let's download the Java driver for Postgres and add it to Payara

We are using driver version 42.2.8

    export PG_DRIVER_JAR=postgresql-42.2.8.jar
    wget https://jdbc.postgresql.org/download/$PG_DRIVER_JAR
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Add the JAR to Payara, simply invoke asadmin add-library

    ~/payara5/glassfish/bin/asadmin add-library $PG_DRIVER_JAR
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Finally, to deploy the WAR file, simply copy it to the domain autodeploy folder

    cp $APP_FOLDER_NAME/target/javaee-cafe.war ~/payara5/glassfish/domains/domain1/autodeploy
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The deployment will take some time. In the meanwhile, you can track the logs using:

    tail -f ~/payara5/glassfish/domains/domain1/logs/server.log
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You should see log messages indicating successful deployment of the javaee-cafe application

    [2019-11-18T13:34:21.317+0000] [Payara 5.193] [INFO] [NCLS-DEPLOYMENT-02035] [javax.enterprise.system.tools.deployment.autodeploy] [tid: _ThreadID=104 _ThreadName=payara-executor-service-scheduled-task] [timeMillis: 1574084061317] [levelValue: 800] [[
    [AutoDeploy] Successfully autodeployed : /home/abhishgu/payara5/glassfish/domains/domain1/autodeploy/javaee-cafe.war.]]
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Explore the application

It's time to test drive our JavaEE app! To start off, we can access the application using a web browser. But, just like the Postgres instance, the virtual machine which hosts the Payara server along with the application is also protected by default i.e. you cannot access it from the public internet.

We need to create a firewall rule using the az vm open-port to access it from our local machine. We just need to expose port 8080 since that's the default HTTP port which Payara server uses

    az vm open-port --port 8080 --resource-group $AZURE_RESOURCE_GROUP_NAME --name $AZURE_VM_NAME
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Access the JSF front end

Use your browser to access http://[ENTER_VM_IP]:8080/javaee-cafe. You can use the UI to create, delete and see coffees.

Use the REST API

The application also exposes a REST API for creating, deleting and listing coffees.

    export VM_IP=[to be filled]
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Create coffees

    curl -X POST $VM_IP:8080/javaee-cafe/rest/coffees -d '{"name":"cappuccino","price":"10"}' -H "Content-Type: application/json"
    curl -X POST $VM_IP:8080/javaee-cafe/rest/coffees -d '{"name":"caffe-latte","price":"15"}' -H "Content-Type: application/json"
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Get all coffees

    curl -H "Accept: application/json" $VM_IP:8080/javaee-cafe/rest/coffees
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You should see a JSON response listing both the coffee options you just added

Get a coffee by ID

    curl -H "Accept: application/json" $VM_IP:8080/javaee-cafe/rest/coffees/1
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Delete a coffee by ID

    curl -X DELETE $VM_IP:8080/javaee-cafe/rest/coffees/1
    curl -H "Accept: application/json" $VM_IP:8080/javaee-cafe/rest/coffees
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Notice that cappuccino is now deleted

Clean up resources

Once you are done exploring the application, you can delete the resources. Since we used a resource group, it's easy executing a single command.

Please be aware that this will delete all the resources in the group which includes the ones you created as part of the tutorial (VM, Postgres, etc.) as well as any other service instances you might have if you used an already existing resource group

    az group delete --name $AZURE_RESOURCE_GROUP_NAME
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Summary

You learned how to deploy a standard Java EE application to Azure using an app server deployed to a Virtual Machine along with a managed database offering for long term persistence.

As mentioned earlier, each option comes with its own pros and cons. In this case, you have complete control over your application, its deployment infrastructure, the way you scale it, etc. On the other hand, remember that managing the infrastructure, sizing it for your application, securing it, etc. are set of responsibilities which you have to take on along with delivering core business logic as a part of the app functionality.

The next part will dive into how to use a Docker Container platform to deploy your Java EE applications. Stay tuned!

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