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How JBoss EAP logging is organized
The logging subsystem has three basic parts:
- Logger categories identify messages, usually by the Java package that produces them. A category’s level determines which messages it accepts.
- Handlers determine where accepted messages go and how they are processed, such as writing to a file or sending to a remote service.
- The root logger handles messages that are not captured by a more specific category.
A category uses the root logger’s handlers by default. You can assign it additional handlers or set use-parent-handlers to false so it uses only its own assigned handlers. A handler must be attached to a logger to be active. Red Hat describes handlers as controlling how messages are “processed and recorded” in its EAP 8.1 logging guide.
Set a package’s log level with the management CLI
The following example uses the EAP logging subsystem path and a Java package named com.example.app. The server must be running, and you need management CLI access. You can also make routine changes in the management console; exact screens and available attributes vary by release.
- Connect to the running server with the management CLI for your EAP installation.
- Add a logger category for the package:
/subsystem=logging/logger=com.example.app:add - Set its level. For example, to enable debug messages:
/subsystem=logging/logger=com.example.app:write-attribute(name=level,value=DEBUG) - Attach an existing handler if the category needs a specific destination:
/subsystem=logging/logger=com.example.app:add-handler(name=APP_FILE) - Read back the logger resource and its handler assignments in the CLI or console, then generate a message from that package at the selected level to check that it reaches the intended destination.
A logger can use any string name, although package names are typical. EAP documentation lists ALL as the category-level default; set the level explicitly rather than relying on a default when configuring a production category. Levels on the logger and handler both matter: a message accepted by the category can still be excluded by a handler’s threshold.
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If you want the category to use only its assigned handlers rather than also inheriting the root logger’s handlers, set the attribute explicitly:
/subsystem=logging/logger=com.example.app:write-attribute(name=use-parent-handlers,value=false)
For category-level filtering, EAP uses the filter-spec attribute. CLI filter expressions may require escaping commas and quotation marks; Red Hat’s example expression is "not(match("WFLY"))". Check quoting against the CLI and release you are using.
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Choose a handler for the destination you need
| Logging need | Handler option | Practical consideration |
|---|---|---|
| Show output in the process console | Console | Console output is not itself durable file storage. Capture it externally if you need to retain it. |
| Write to a named file | File | Choose an explicit path or a suitable server-relative directory. |
| Rotate files on a schedule | Periodic rotating | Set the schedule and retention policy to suit your operational needs. |
| Rotate when a file reaches a size limit | Size rotating | Choose the size threshold and retained-file settings supported by your release. |
| Rotate by both time and size | Periodic-size rotating | Confirm the available attributes and rotation behavior in the release-specific guide. |
| Forward to a logging service | Syslog or socket | Confirm protocol, destination, transport, and security requirements. EAP 7.4 documents syslog support for RFC-3164 or RFC-5424 and socket transport over TCP or UDP. |
| Customize or buffer processing | Custom or asynchronous | These specialized options can require modules, sub-handlers, or additional attributes. |
EAP 8.1 documents console, file, periodic rotating, size rotating, periodic-size rotating, syslog, socket, custom, and asynchronous handlers. It also documents pattern, JSON, XML, and custom formatters. Use the EAP 8.1 guide to check the attributes and syntax available in that release rather than assuming another version supports an identical configuration.
To attach a handler to the root logger, use the root-logger resource, for example:
/subsystem=logging/root-logger=ROOT:add-handler(name=APP_FILE)
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For a managed domain, EAP 7.4 procedures use a profile-qualified path such as /profile=PROFILE_NAME/subsystem=logging/.... Confirm the corresponding path and operation for your release and management model before running commands.
Choose the right configuration scope
Server-wide logging
Use the main logging subsystem when you want to configure server logging centrally. Categories, handlers, and the root logger in this subsystem govern server-level routing.
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A logging profile is an independent set of handlers, categories, and one root logger for deployed applications. Profiles do not refer to one another or to the main logging subsystem. In EAP 7.4, an application selects a profile by setting the Logging-Profile attribute in its MANIFEST.MF, allowing that application to use a distinct logging setup.
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An illustrative EAP 7.4 CLI sequence is:
/subsystem=logging/logging-profile=APP_PROFILE:add
/subsystem=logging/logging-profile=APP_PROFILE/file-handler=APP_FILE:add(file={path=>"app.log", "relative-to"=>"jboss.server.log.dir"})
/subsystem=logging/logging-profile=APP_PROFILE/logger=com.example.app:add(level=DEBUG)
/subsystem=logging/logging-profile=APP_PROFILE/logger=com.example.app:add-handler(name="APP_FILE")
This example demonstrates the profile path and attachment pattern, not a universal command for every EAP release. Verify file-handler syntax and the interaction of logger and handler levels in your target version before applying it.
Per-deployment logging configuration
An application can provide logging configuration with its deployment. The EAP 7.4 guide says deployment logging configuration is read only at server startup and cannot be changed at runtime. If it is not configured, subsystem logging configuration applies to applications as well as the server. That release documents use-deployment-logging-config as enabled by default; check the matching guide before relying on that default in another release.
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Verify changes and avoid common mistakes
- Match the guide to the product and version. This article’s current procedural basis is EAP 8.1, while the profile and deployment details above are explicitly from EAP 7.4.
- Confirm the category and level. Logger names are often package names; verify that the messages you expect originate from the category you configured.
- Check both logger and handler thresholds. An attached handler can still filter messages accepted by the category.
- Check handler attachment and inheritance. An unattached handler does nothing, and root handlers are inherited unless
use-parent-handlersis disabled. - Read the configuration back and generate a test message. Verify the resource in management tools and confirm the message appears at the chosen destination.
- Unassign before removing a handler. The EAP 7.4 guide warns that a handler cannot be removed while assigned to a logger or asynchronous handler.
Why old JBoss logging defaults may not apply
The EAP 6.4 administration guide documents a default console handler and periodic handler, with the latter writing server.log. That is a legacy EAP 6.4 fact, not a universal default for current JBoss-family servers. Check your release’s configuration and documentation instead of assuming the same handlers or file location are in use.
Official release references: JBoss EAP 8.1 logging guide, JBoss EAP 7.4 logging guide, and JBoss EAP 6.4 logging subsystem guide.
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