Logging

This guide describes how to configure JxBrowser logging.

The root cause of many issues can be detected by analyzing JxBrowser log messages.

If you see an issue or some unexpected behavior, please configure JxBrowser to print all log messages to a file or System.err, reproduce the issue, and provide us with the collected log messages.

By default, JxBrowser is configured to print all log messages with the ERROR level to System.err.

Levels

JxBrowser supports the following logging levels: DEBUG < INFO < WARNING < ERROR. By default, the library prints only messages with ERROR logging level, the rest is ignored.

Use OFF level to turn off logging completely, and ALL level to log all the messages.

You can change the default logging level via jxbrowser.logging.level system property or JxBrowser Logging API.

Example: Setting Logging Level

Use the following system property to enable DEBUG logging:

-Djxbrowser.logging.level=DEBUG

Or configure it in the code:

      System.setProperty("jxbrowser.logging.level", "DEBUG");

    

      System.setProperty("jxbrowser.logging.level", "DEBUG")

    

Or use JxBrowser Logging API:

      import com.teamdev.jxbrowser.logging.Level;
import com.teamdev.jxbrowser.logging.Logger;
...
Logger.level(Level.DEBUG);

    

      import com.teamdev.jxbrowser.logging.Level
import com.teamdev.jxbrowser.logging.Logger
...
Logger.level(Level.DEBUG)

    

Logging to a file

To print all log messages to a file please use the jxbrowser.logging.file system property.

Use the following system property to configure the log file path:

-Djxbrowser.logging.file=jxbrowser.log

Or configure it in the code:

      System.setProperty("jxbrowser.logging.file", "jxbrowser.log");

    

      System.setProperty("jxbrowser.logging.file", "jxbrowser.log")

    

The value of the property may be both an absolute or relative path to a file.

If the library can’t create a log file, it fallbacks to the default behavior and prints an error message with the exception stack trace to System.err.

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