Troubleshooting JBoss EAP Bootup Errors

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Troubleshooting JBoss EAP Bootup Errors

The JBoss Enterprise Application Platform allows us to deploy and manage Java-based applications quickly and easily — or, rather, it should. There are times, however, when JBoss fails to deploy, even when everything _looks_ like it should work from the outside. In these times, we want to leverage JBoss's logging systems to troubleshoot our deployment and fix any outstanding issues.

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Lab Info

Level

Beginner

Last updated

Sep 20, 2025

Duration

30m

Challenge

Reproduce the Issue.
1. Start JBoss EAP and make sure it starts successfully.
2. Access the JBoss CLI.
3. Attempt to deploy the application.
Challenge

Review the Logs to Diagnose the Issue.
1. Review the last few logs input in the server.log error. Note that while the JBoss EAP service started, there were errors.
2. To discover what the errors during startup were, we can use the read-boot-errors command.
Challenge

Resolve the Issue.
1. Log out of the JBoss CLI.
2. Use the lsof command to view which processes are on port 8080.
3. Kill the process.
4. Restart JBoss EAP.
Challenge

Confirm the Application Deploys Successfully.
1. Return to the JBoss CLI.
2. Ensure there were no boot errors.
3. Deploy the application.

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