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Debugging your local application using IDE

Use Case: As a developer, I want to do step-by-step debugging of an applicaton running as a pod on the OpenShift cluster using IDE.

Application Debugging is explained in detail in this blogpost. We will cover the required steps shortly in this chapter. Please read the blog at your convenience for detailed overview on debugging using JBDS.

Step 1 Create Server Adapter Server Adapter synchronizes the content between the running application and the workspace.

  • Go to the OpenShift Explorer view and right click on the wildfly service and select Server Adapter to create the server adapter for the wildfly application service

  • Next you will see Server Settings page. Ensure that the Eclipse Project name matches what you see in the Project Explorer view i.e. jboss-as-kitchensink and press Finish. You will quickly start seeing Console output that shows the syncup between the pod and the workstation. Once complete you should see wildfly at OpenShift on the Servers view.

The Server adapter is now created and ready to use.

Step 2: Set up Server adapter for debugging

  • On the Servers view, right click on the wildfly at OpenShift 3 and select Restart in Debug.

This will stop the current application pod and start a new one with debugging features. It will take a few seconds for it to come up. So, you can observe the pod going down and the new one coming up. When the new pod starts, the Servers view will show that the adapter is running in Debugging mode

  • Go to the OpenShift Explorer view, right click on wildfly service and select Manage Environment Variables. You can observe that the debug variables are all set automatically.

  • Open MemberRegistration.java in controller from source code and double-click on the line inside the register() method to insert a breakpoint as shown below.

Now we are ready to start debugging.

Step 3 Start debugging

  • Access the application URL in the browser

  • Add values for Name, Email and Phone # and press on the Register button on the application webpage.

  • JBDS will ask you to switch to Debug perspective. Press Yes

  • The control now stops at the breakpoint. You can do step-by-step debugging now.

Once complete, you can switch back to the JBoss perspective. You can also Restart the Server adapter in the normal mode.

Summary: In this chapter we have learnt to debug an application running on OpenShift using IDE.