java.util.logging

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.

Install

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

<dependency>
    <groupId>io.sentry</groupId>
    <artifactId>sentry-jul</artifactId>
    <version>7.15.0</version>
</dependency>

For other dependency managers, see the central Maven repository.

Configure

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

The following example configures a ConsoleHandler that logs to standard out at the INFO level and a SentryHandler that logs to the Sentry server at the WARN level. The ConsoleHandler is only provided as an example of a non-Sentry appender that is set to a different logging threshold, like one you may already have in your project.

Example configuration using the logging.properties format:

# Enable the Console and Sentry handlers
handlers=java.util.logging.ConsoleHandler,io.sentry.jul.SentryHandler

# Set the default log level to INFO
.level=INFO

# Override the Sentry handler log level to WARNING
io.sentry.jul.SentryHandler.level=WARNING

When starting your application, add the java.util.logging.config.file to the system properties, with the full path to the logging.properties as its value:

java -Djava.util.logging.config.file=/path/to/app.properties MyClass

DSN Configuration

Sentry reads the DSN 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.

dsn=https://examplePublicKey@o0.ingest.sentry.io/0

Minimum Log Level

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).

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.config 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 config or warning messages. For this to work, SentryHandler needs to receive all log entries to decide what to keep as breadcrumb or send as event. Set the SentryHandler log level configuration to a value lower than what is set for the minimumBreadcrumbLevel and minimumEventLevel so that SentryHandler receives these log messages.

io.sentry.jul.SentryHandler.minimumEventLevel=INFO
io.sentry.jul.SentryHandler.minimumBreadcrumbLevel=CONFIG
io.sentry.jul.SentryHandler.level=CONFIG
...

String Formatting Style

By default, MessageFormat#format method is used to render parameterized log messages. It can be changed to use String#format by setting printfStyle property to true:

io.sentry.jul.SentryHandler.printfStyle=true

Verify

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

import io.sentry.Sentry;

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

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