Start Monitoring Your Java Web Application
With Azure Application Insights, you can easily monitor your web application for availability, performance, and usage. You can also quickly identify and diagnose errors in your application without waiting for a user to report them. With the Application Insights Java SDK, you can monitor common third-party packages including MongoDB, MySQL, and Redis.
This quickstart guides you through adding the Application Insights SDK to an existing Java Dynamic Web Project.
To complete this quickstart:
- Install JRE 1.7 or 1.8
- Install Free Eclipse IDE for Java EE Developers. This quickstart uses Eclipse Oxygen (4.7)
- You will need an Azure Subscription and an existing Java Dynamic Web Project
If you don't have a Java Dynamic Web Project, you can create one with the Create a Java web app quickstart.
If you don't have an Azure subscription, create a free account before you begin.
If you prefer the Spring framework, try the configure a Spring Boot initializer app to use Application Insights guide
Sign in to the Azure portal
Sign in to the Azure portal.
Enable Application Insights
Application Insights can gather telemetry data from any internet-connected application, regardless of whether it's running on-premises or in the cloud. Use the following steps to start viewing this data.
Select Create a resource > Developer tools > Application Insights.
A configuration box appears; use the following table to fill out the input fields.
Settings Value Description Name Globally Unique Value Name that identifies the app you are monitoring Resource Group myResourceGroup Name for the new resource group to host App Insights data Location East US Choose a location near you, or near where your app is hosted
Install App Insights Plugin
Launch Eclipse > Click Help > Select Install New Software.
https://dl.microsoft.com/eclipseinto the "Work With" field > Check Azure Toolkit for Java > Select Application Insights Plugin for Java > Uncheck "Contact all update sites during install to find required software."
Once the installation is complete, you will be prompted to Restart Eclipse.
Configure App Insights Plugin
Launch Eclipse > Open your Project > Right-click the project name in the Project Explorer > Select Azure > Click Sign In.
Select Authentication Method Interactive > Click Sign In > When prompted enter your Azure credentials > Select Your Azure Subscription.
Right-click your project name in Project Explorer > Select Azure > Click Configure Application Insights.
Check Enable telemetry with Application Insights > Select the App Insights resource and associated Instrumentation Key you want to link to your Java app.
After configuring the Application Insights plugin you need to publish/republish your application again, before it will be able to start sending telemetry.
The Application Insights SDK for Java is capable of capturing and visualizing live metrics, but when you first enable telemetry collection it can take a few minutes before data begins appearing in the portal. If this app is a low-traffic test app, keep in mind that most metrics are only captured when there are active requests or operations.
Start monitoring in the Azure portal
You can now reopen the Application Insights Overview page in the Azure portal to view details about your currently running application.
Click Application map for a visual layout of the dependency relationships between your application components. Each component shows KPIs such as load, performance, failures, and alerts.
Click on the App Analytics icon View in Analytics. This opens Application Insights Analytics, which provides a rich query language for analyzing all data collected by Application Insights. In this case, a query is generated for you that renders the request count as a chart. You can write your own queries to analyze other data.
Return to the Overview page and examine the KPI graphs. This dashboard provides statistics about your application health, including the number of incoming requests, the duration of those requests, and any failures that occur.
To enable the Page View Load Time chart to populate with client-side telemetry data, add this script to each page that you want to track:
Click on Live Stream. Here you find live metrics related to the performance of your Java web app. Live Metrics Stream includes data regarding the number of incoming requests, the duration of those requests, and any failures that occur. You can also monitor critical performance metrics, such as processor and memory in real-time.
To learn more about monitoring Java, check out the additional App Insights Java documentation.
Clean up resources
When you are done testing, you can delete the resource group and all related resources. To do so follow the steps below.
- From the left-hand menu in the Azure portal, click Resource groups and then click myResourceGroup.
- On your resource group page, click Delete, type myResourceGroup in the text box, and then click Delete.