The main page for the Log4Web application will display a list of options for the user to select

These options are explained below

Choose Logfile
A drop-down list of all the message files is shown. The list of files is obtained from the messagesPath initialisation parameter. This parameter is explained here. If the list is empty then no messages can be displayed.

Category Prefix
This option allows a filter on the category field of the message (this is known as the Logger in more recent versions of Log4J). Refer to the Log4J documentation for a detailed description of this field. If a value is entered in this text box, then Log4Web will display only those messages that have a category value that begins with the value entered.

NDC Prefix
This option allows a filter on the NDC (Nested Diagnostic Context) field of the message. Refer to the Log4J documentation for a detailed description of this field. If a value is entered in this text box, then Log4Web will display only those messages that have an NDC value that begins with the value entered.

Thread Name
This option allows a filter on the thread field of the message. Refer to the Log4J documentation for a detailed description of this field. If a value is entered in this text box, then Log4Web will display only those messages that have a thread value that exactly matches the value entered.

Minimum Priority
This option allows a filter on the priority field of the message. Refer to the Log4J documentation for a detailed description of this field. Log4Web will display only those messages that have a priority value that is greater than or equal to the value selected.

Later Than
This option allows a filter on the timestamp field of the message. Refer to the Log4J documentation for a detailed description of this field. Log4Web will display only those messages that have a timestamp value that is greater than or equal to the value selected.

Earlier Than
This option allows a filter on the timestamp field of the message. Refer to the Log4J documentation for a detailed description of this field. Log4Web will display only those messages that have a timestamp value that is less than or equal to the value selected.

Extras
These options allow the verbosity of the output display to be configured. The checkboxes are used to state whether or not the thread name and the NDC values should be displayed in the output messages list. If these fields are not of interest, then they can be left out of the display and therefore reduce the size of the output.

Show Log Messages
When this button is pressed, the filtered set of messages is displayed in the browser window, as shown in the image below

This page provides a link back to the filter selection page, and a link to refresh the messages list.