Logback

The sentry-logback library provides Logback support for Sentry using an Appender that sends logged exceptions to Sentry.

Once this integration is configured you can also use Sentry’s static API, as shown on the usage page, in order to do things like record breadcrumbs, set the current user, or manually send events. The source can be found on GitHub.

On this page, we get you up and running with Sentry's SDK.

Don't already have an account and Sentry project established? Head over to sentry.io, then return to this page.

Sentry captures data by using an SDK within your application’s runtime.

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<dependency>
    <groupId>io.sentry</groupId>
    <artifactId>sentry-logback</artifactId>
    <version>7.9.0</version>
</dependency>

For other dependency managers, see the central Maven repository.

We recommend using our Gradle plugin as it can add integrations and provide source context for events.

If you are manually adding multiple Sentry dependencies, you can add a bill of materials to avoid specifying the version of each dependency.

Configuration should happen as early as possible in your application's lifecycle.

The following example configures a ConsoleAppender that logs to standard out at the INFO level, and a SentryAppender that logs to the Sentry server at the ERROR level.

The ConsoleAppender is provided only as an example of a non-Sentry appender set to a different logging threshold, similar to what you may already have in your project.

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<configuration>
    <!-- Configure the Console appender -->
    <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Configure the Sentry appender, overriding the logging threshold to the WARN level -->
    <appender name="Sentry" class="io.sentry.logback.SentryAppender">
        <options>
            <!-- NOTE: Replace the test DSN below with YOUR OWN DSN to see the events from this app in your Sentry project/dashboard -->
            <dsn>https://examplePublicKey@o0.ingest.sentry.io/0</dsn>
        </options>
    </appender>

    <!-- Enable the Console and Sentry appenders, Console is provided as an example
 of a non-Sentry logger that is set to a different logging threshold -->
    <root level="INFO">
        <appender-ref ref="Console" />
        <appender-ref ref="Sentry" />
    </root>
</configuration>

Note that you need to configure your DSN (client key).

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<appender name="Sentry" class="io.sentry.logback.SentryAppender">
    <options>
        <!-- NOTE: Replace the test DSN below with your DSN to see the events from this app in sentry.io -->
        <dsn>https://examplePublicKey@o0.ingest.sentry.io/0</dsn>
    </options>
</appender>

If the DSN is not present in the logback.xml configuration, Sentry will attempt to read it from the system property sentry.dsn, environment variable SENTRY_DSN or the dsn property in sentry.properties file. See the configuration page for more details on external configuration.

Two log levels are used to configure this integration:

  1. Configure the lowest level required for a log message to become an event (minimumEventLevel) sent to Sentry.
  2. Configure the lowest level a message has to be to become a breadcrumb (minimumBreadcrumbLevel).

Setting minimumEventLevel or minimumBreadcrumbLevel in logback.xml only affects events logged by way of Logback. The settings will have no effect when calling Sentry.captureMessage or similar directly.

Breadcrumbs are kept in memory (by default the last 100 records) and are sent with events. For example, by default, if you log 100 entries with logger.info or logger.warn, no event is sent to Sentry. If you then log with logger.error, an event is sent to Sentry which includes those 100 info or warn messages. For this to work, SentryAppender needs to receive all log entries to decide what to keep as breadcrumb or sent as event. Set the SentryAppender log level configuration to a value lower than what is set for the minimumBreadcrumbLevel and minimumEventLevel so that SentryAppender receives these log messages.

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<appender name="Sentry" class="io.sentry.logback.SentryAppender">
    <options>
        <!-- NOTE: Replace the test DSN below with YOUR OWN DSN to see the events from this app in your Sentry project/dashboard -->
        <dsn>https://examplePublicKey@o0.ingest.sentry.io/0</dsn>
    </options>
    <!-- Optionally change minimum Event level. Default for Events is ERROR -->
    <minimumEventLevel>WARN</minimumEventLevel>
    <!-- Optionally change minimum Breadcrumbs level. Default for Breadcrumbs is INFO -->
    <minimumBreadcrumbLevel>DEBUG</minimumBreadcrumbLevel>
</appender>

This snippet includes an intentional error, so you can test that everything is working as soon as you set it up.

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import io.sentry.Sentry;

try {
  throw new Exception("This is a test.");
} catch (Exception e) {
  Sentry.captureException(e);
}

Learn more about manually capturing an error or message in our Usage documentation.

To view and resolve the recorded error, log into sentry.io and open your project. Clicking on the error's title will open a page where you can see detailed information and mark it as resolved.

Help improve this content
Our documentation is open source and available on GitHub. Your contributions are welcome, whether fixing a typo (drat!) or suggesting an update ("yeah, this would be better").