Configure Access Logging

Access logs can be configured for Tomcat, Undertow, and Jetty through their respective namespaces.

For instance, the following settings log access on Tomcat with a custom pattern.

Properties
YAML

server.tomcat.basedir=my-tomcat
server.tomcat.accesslog.enabled=true
server.tomcat.accesslog.pattern=%t %a %r %s (%D ms)

server:
  tomcat:
    basedir: "my-tomcat"
    accesslog:
      enabled: true
      pattern: "%t %a %r %s (%D ms)"

The default location for logs is a logs directory relative to the Tomcat base directory. By default, the logs directory is a temporary directory, so you may want to fix Tomcat’s base directory or use an absolute path for the logs. In the preceding example, the logs are available in my-tomcat/logs relative to the working directory of the application.

Access logging for Undertow can be configured in a similar fashion, as shown in the following example:

Properties
YAML

server.undertow.accesslog.enabled=true
server.undertow.accesslog.pattern=%t %a %r %s (%D ms)
server.undertow.options.server.record-request-start-time=true

server:
  undertow:
    accesslog:
      enabled: true
      pattern: "%t %a %r %s (%D ms)"
    options:
      server:
        record-request-start-time: true

Note that, in addition to enabling access logging and configuring its pattern, recording request start times has also been enabled. This is required when including the response time (%D) in the access log pattern. Logs are stored in a logs directory relative to the working directory of the application. You can customize this location by setting the server.undertow.accesslog.dir property.

Finally, access logging for Jetty can also be configured as follows:

Properties
YAML

server.jetty.accesslog.enabled=true
server.jetty.accesslog.filename=/var/log/jetty-access.log

server:
  jetty:
    accesslog:
      enabled: true
      filename: "/var/log/jetty-access.log"

By default, logs are redirected to System.err. For more details, see the Jetty documentation.