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Chainsaw Tool
Chainsaw is a GUI log viewer and filter for the log4j
package. By default it listens for LoggingEvent objects sent using
the SocketAppender and
displays them in a table. The events can be filtered based on:
- Level
- Thread name
- Logger
- Message
- NDC
All the details for each event can be displayed by selecting
the event in the table.
Chainsaw also supports loading a events logged to a file using
the XMLLayout format. This
is great for analysing log files, and means you do not need to
keep Chainsaw running continously. It is easy to add support
for loading events from other sources like JDBC.
A picture is worth a thousand words:
.
Finally, why is it called chainsaw?
Because it cuts your log (file) down to size. :-)
Requirements
Chainsaw is based on the Swing API which requires JDK 1.2 or later.
Running chainsaw
Setup
You need to include the log4j.jar in the classpath.
Usage
The command line usage is:
java -D<property>=<value> org.apache.log4j.chainsaw.Main
The default behaviour of chainsaw can be changed by setting system properties
using the -D<property>=<value> arguments to java. The
following table describes what properties can be set:
Property
Description
chainsaw.port
Indicates which port to listen for connections on. Defaults
to "4445".
Configuring Log4J
You will need to configure log4j to send logging events to
Chainsaw. Here is a sample log4j.properties file
for sending logging events to Chainsaw.
log4j.rootLogger=DEBUG, CHAINSAW_CLIENT
log4j.appender.CHAINSAW_CLIENT=org.apache.log4j.net.SocketAppender
log4j.appender.CHAINSAW_CLIENT.RemoteHost=localhost
log4j.appender.CHAINSAW_CLIENT.Port=4445
log4j.appender.CHAINSAW_CLIENT.LocationInfo=true