Logging Leave feedback
By default, logging is disabled when rendering documents. You can log to a file.
To log to a text file, use the FileLogger class.
The log contains the following four types of messages:
- Error means unrecoverable exceptions
- Warning means recoverable/expected exceptions
- Debug means debug information
- Trace means general information
The following code snippet shows how to log to a file using the FileLogger class:
import com.groupdocs.viewer.Viewer;
import com.groupdocs.viewer.ViewerSettings;
import com.groupdocs.viewer.logging.FileLogger;
import com.groupdocs.viewer.options.HtmlViewOptions;
import com.groupdocs.viewer.options.ViewOptions;
// ...
// Create logger and specify the output file
FileLogger fileLogger = new FileLogger("output.log");
// Create ViewerSettings and specify FileLogger
ViewerSettings viewerSettings = new ViewerSettings(fileLogger);
try (Viewer viewer = new Viewer("sample.pdf", viewerSettings)) {
ViewOptions viewOptions = HtmlViewOptions.forEmbeddedResources("result.html");
viewer.view(viewOptions);
}
The following image shows the output.log file:
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