helma.logging

The helma.logging module provides logging functionality using Apache log4j.

helma.logging can be configured by passing a log4j XML or properties configuration file to the setConfig() method. The default configuration is file modules/helma/log4j.properties.

Helma provides a special Appender class called org.helma.util.RhinoAppender that allows to send log messages to a Javascript callback function. The logging module provides the methods enableResponseLog() and disableResponseLog() to enable and disable appending of RhinoAppender log messages to a response buffer, using similar formatting as res.debug in Helma 1.

  importModule('helma.logging', 'logging');
  logging.enableResponseLog();
  var log = logging.getLogger('modulename');

Then the following code ...

    log.info("Hello world!");
    try {
        foo.bar;
    } catch (e) {
        log.error(e, e.rhinoException);
    }

... will produce the following output on the rendered page:

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