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Azure App Service lets Java developers to quickly build, deploy, and scale their Tomcat web applications on a fully managed Windows-based service. Deploy applications with Maven plugins from the command line or in editors like IntelliJ, Eclipse, or Visual Studio Code.
This guide provides key concepts and instructions for Java developers using in App Service. If you've never used Azure App Service, you should read through the Java quickstart first. General questions about using App Service that aren't specific to the Java development are answered in the App Service Windows FAQ.
Deploying your app
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You can use Maven Plugin for Azure App Service to deploy your .war files. Deployment with popular IDEs is also supported with Azure Toolkit for IntelliJ or Azure Toolkit for Eclipse.
Otherwise, your deployment method will depend on your archive type:
- To deploy .war files to Tomcat, use the
/api/wardeploy/
endpoint to POST your archive file. For more information on this API, please see this documentation.
Do not deploy your .war using FTP. The FTP tool is designed to upload startup scripts, dependencies, or other runtime files. It is not the optimal choice for deploying web apps.
Logging and debugging apps
Performance reports, traffic visualizations, and health checkups are available for each app through the Azure portal. For more information, see Azure App Service diagnostics overview.
Stream diagnostic logs
You can access the console logs generated from inside the container. First, turn on container logging by running the following command in the Cloud Shell:
Once container logging is turned on, run the following command to see the log stream:
If you don't see console logs immediately, check again in 30 seconds.
Note
You can also inspect the log files from the browser at
https://<app-name>.scm.azurewebsites.net/api/logs/docker
.To stop log streaming at any time, type
Ctrl
+C
.For more information, see Stream logs in Cloud Shell.
App logging
Enable application logging through the Azure portal or Azure CLI to configure App Service to write your application's standard console output and standard console error streams to the local filesystem or Azure Blob Storage. Logging to the local App Service filesystem instance is disabled 12 hours after it is configured. If you need longer retention, configure the application to write output to a Blob storage container. Your Java and Tomcat app logs can be found in the /LogFiles/Application/ directory.
If your application uses Logback or Log4j for tracing, you can forward these traces for review into Azure Application Insights using the logging framework configuration instructions in Explore Java trace logs in Application Insights.
Customization and tuning
Azure App Service supports out of the box tuning and customization through the Azure portal and CLI. Review the following articles for non-Java-specific web app configuration:
Set Java runtime options
To set allocated memory or other JVM runtime options, create an app setting named
JAVA_OPTS
with the options. App Service passes this setting as an environment variable to the Java runtime when it starts.In the Azure portal, under Application Settings for the web app, create a new app setting named
JAVA_OPTS
that includes the additional settings, such as -Xms512m -Xmx1204m
.To configure the app setting from the Maven plugin, add setting/value tags in the Azure plugin section. The following example sets a specific minimum and maximum Java heap size:
Developers running a single application with one deployment slot in their App Service plan can use the following options:
- B1 and S1 instances:
-Xms1024m -Xmx1024m
- B2 and S2 instances:
-Xms3072m -Xmx3072m
- B3 and S3 instances:
-Xms6144m -Xmx6144m
When tuning application heap settings, review your App Service plan details and take into account multiple applications and deployment slot needs to find the optimal allocation of memory.
Turn on web sockets
Turn on support for web sockets in the Azure portal in the Application settings for the application. You'll need to restart the application for the setting to take effect.
Turn on web socket support using the Azure CLI with the following command:
Then restart your application:
Set default character encoding
In the Azure portal, under Application Settings for the web app, create a new app setting named
JAVA_OPTS
with value -Dfile.encoding=UTF-8
.Alternatively, you can configure the app setting using the App Service Maven plugin. Add the setting name and value tags in the plugin configuration:
Pre-Compile JSP files
To improve performance of Tomcat applications, you can compile your JSP files before deploying to App Service. You can use the Maven plugin provided by Apache Sling, or using this Ant build file.
Secure applications
Java applications running in App Service have the same set of security best practices as other applications.
Authenticate users (Easy Auth)
Set up app authentication in the Azure portal with the Authentication and Authorization option. From there, you can enable authentication using Azure Active Directory or social logins like Facebook, Google, or GitHub. Azure portal configuration only works when configuring a single authentication provider. For more information, see Configure your App Service app to use Azure Active Directory login and the related articles for other identity providers. If you need to enable multiple sign-in providers, follow the instructions in the customize App Service authentication article.
Tomcat and Wildfly
Your Tomcat or Wildfly application can access the user's claims directly from the servlet by casting the Principal object to a Map object. The Map object will map each claim type to a collection of the claims for that type. In the code below,
request
is an instance of HttpServletRequest
.Now you can inspect the
Map
object for any specific claim. For example, the following code snippet iterates through all the claim types and prints the contents of each collection.To sign users out, use the
/.auth/ext/logout
path. To perform other actions, please see the documentation on App Service Authentication and Authorization usage. There is also official documentation on the Tomcat HttpServletRequest interface and its methods. The following servlet methods are also hydrated based on your App Service configuration:To disable this feature, create an Application Setting named
WEBSITE_AUTH_SKIP_PRINCIPAL
with a value of 1
. To disable all servlet filters added by App Service, create a setting named WEBSITE_SKIP_FILTERS
with a value of 1
.Configure TLS/SSL
Follow the instructions in the Secure a custom DNS name with an SSL binding in Azure App Service to upload an existing SSL certificate and bind it to your application's domain name. By default your application will still allow HTTP connections-follow the specific steps in the tutorial to enforce SSL and TLS.
Use KeyVault References
Azure KeyVault provides centralized secret management with access policies and audit history. You can store secrets (such as passwords or connection strings) in KeyVault and access these secrets in your application through environment variables.
First, follow the instructions for granting your app access to Key Vault and making a KeyVault reference to your secret in an Application Setting. You can validate that the reference resolves to the secret by printing the environment variable while remotely accessing the App Service terminal.
To inject these secrets in your Spring or Tomcat configuration file, use environment variable injection syntax (
${MY_ENV_VAR}
). For Spring configuration files, please see this documentation on externalized configurations.Configure APM platforms
This section shows how to connect Java applications deployed on Azure App Service on Linux with the NewRelic and AppDynamics application performance monitoring (APM) platforms.
Configure New Relic
- Create a New Relic account at NewRelic.com
- Download the Java agent from NewRelic, it will have a file name similar to newrelic-java-x.x.x.zip.
- Copy your license key, you'll need it to configure the agent later.
- Use the Kudu console to create a new directory /home/site/wwwroot/apm.
- Upload the unpacked New Relic Java agent files into a directory under /home/site/wwwroot/apm. The files for your agent should be in /home/site/wwwroot/apm/newrelic.
- Modify the YAML file at /home/site/wwwroot/apm/newrelic/newrelic.yml and replace the placeholder license value with your own license key.
- In the Azure portal, browse to your application in App Service and create a new Application Setting.
- If your app is using Java SE, create an environment variable named
JAVA_OPTS
with the value-javaagent:/home/site/wwwroot/apm/newrelic/newrelic.jar
. - If you're using Tomcat, create an environment variable named
CATALINA_OPTS
with the value-javaagent:/home/site/wwwroot/apm/newrelic/newrelic.jar
.
- If your app is using Java SE, create an environment variable named
Configure AppDynamics
- Create an AppDynamics account at AppDynamics.com
- Download the Java agent from the AppDynamics website, the file name will be similar to AppServerAgent-x.x.x.xxxxx.zip
- Use the Kudu console to create a new directory /home/site/wwwroot/apm.
- Upload the Java agent files into a directory under /home/site/wwwroot/apm. The files for your agent should be in /home/site/wwwroot/apm/appdynamics.
- In the Azure portal, browse to your application in App Service and create a new Application Setting.
- If you're using Java SE, create an environment variable named
JAVA_OPTS
with the value-javaagent:/home/site/wwwroot/apm/appdynamics/javaagent.jar -Dappdynamics.agent.applicationName=<app-name>
where<app-name>
is your App Service name. - If you're using Tomcat, create an environment variable named
CATALINA_OPTS
with the value-javaagent:/home/site/wwwroot/apm/appdynamics/javaagent.jar -Dappdynamics.agent.applicationName=<app-name>
where<app-name>
is your App Service name.
- If you're using Java SE, create an environment variable named
If you already have an environment variable for
JAVA_OPTS
or CATALINA_OPTS
, append the -javaagent:/...
option to the end of the current value.Data sources
Tomcat
These instructions apply to all database connections. You will need to fill placeholders with your chosen database's driver class name and JAR file. Provided is a table with class names and driver downloads for common databases.
Database | Driver Class Name | JDBC Driver |
---|---|---|
PostgreSQL | org.postgresql.Driver | Download |
MySQL | com.mysql.jdbc.Driver | Download (Select 'Platform Independent') |
SQL Server | com.microsoft.sqlserver.jdbc.SQLServerDriver | Download |
To configure Tomcat to use Java Database Connectivity (JDBC) or the Java Persistence API (JPA), first customize the
CATALINA_OPTS
environment variable that is read in by Tomcat at start-up. Set these values through an app setting in the App Service Maven plugin:Or set the environment variables in the Configuration > Application Settings page in the Azure portal.
Next, determine if the data source should be available to one application or to all applications running on the Tomcat servlet.
Application-level data sources
- Create a context.xml file in the META-INF/ directory of your project. Create the META-INF/ directory if it does not exist.
- In context.xml, add a
Context
element to link the data source to a JNDI address. Replace thedriverClassName
placeholder with your driver's class name from the table above. - Update your application's web.xml to use the data source in your application.
Finalize configuration
Finally, we will place the driver JARs in the Tomcat classpath and restart your App Service. Ensure that the JDBC driver files are available to the Tomcat classloader by placing them in the /home/tomcat/lib directory. (Create this directory if it does not already exist.) To upload these files to your App Service instance, perform the following steps:
- In the Cloud Shell, install the webapp extension:
- Run the following CLI command to create an SSH tunnel from your local system to App Service:
- Connect to the local tunneling port with your SFTP client and upload the files to the /home/tomcat/lib folder.
Alternatively, you can use an FTP client to upload the JDBC driver. Follow these instructions for getting your FTP credentials.
Configuring Tomcat
To edit Tomcat's
server.xml
or other configuration files, first take a note of your Tomcat major version in the portal.- Find the Tomcat home directory for your version by running the
env
command. Search for the environment variable that begins withAZURE_TOMCAT
and matches your major version. For example,AZURE_TOMCAT85_HOME
points to the Tomcat directory for Tomcat 8.5. - Once you have identified the Tomcat home directory for your version, copy the configuration directory to
D:home
. For example, ifAZURE_TOMCAT85_HOME
had a value ofD:Program Files (x86)apache-tomcat-8.5.37
, the new path of the copied directory would beD:homeapache-tomcat-8.5.37
.
Finally, restart your App Service. Your deployments should go to
D:homesitewwwrootwebapps
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Java runtime statement of support
JDK versions and maintenance
Azure's supported Java Development Kit (JDK) is Zulu provided through Azul Systems.
Major version updates will be provided through new runtime options in Azure App Service for Windows. Customers update to these newer versions of Java by configuring their App Service deployment and are responsible for testing and ensuring the major update meets their needs.
Supported JDKs are automatically patched on a quarterly basis in January, April, July, and October of each year. For more information on Java on Azure, please see this support document.
Security updates
Patches and fixes for major security vulnerabilities will be released as soon as they become available from Azul Systems. A 'major' vulnerability is defined by a base score of 9.0 or higher on the NIST Common Vulnerability Scoring System, version 2.
Deprecation and retirement
If a supported Java runtime will be retired, Azure developers using the affected runtime will be given a deprecation notice at least six months before the runtime is retired.
Local development
Developers can download the Production Edition of Azul Zulu Enterprise JDK for local development from Azul's download site.
Development support
Product support for the Azure-supported Azul Zulu JDK is available through Microsoft when developing for Azure or Azure Stack with a qualified Azure support plan.
Runtime support
Developers can open an issue with the Azul Zulu JDKs through Azure Support if they have a qualified support plan.
Next steps
This topic provides the Java Runtime statement of support for Azure App Service on Windows.
- To learn more about hosting web applications with Azure App Service see App Service overview.
- For information about Java on Azure development see Azure for Java Dev Center.
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