Chapter 17. Logging

Main Logs
Another Useful Logging Settings
Access Log in Apache Tomcat
Application Server Logs
Graph Run Logs
Server Audit Logs
Designer-Server Integration Logs

Main Logs

The CloverDX Server uses the log4j library for logging. The WAR file contains the default log4j configuration. The log4j configuration file log4j.xml is placed in WEB-INF/classes directory.

By default, log files are produced in the directory specified by the system property in the cloverlogs subdirectory.

The system property usually points to a common system temp directory, i.e. /tmp. On Apache Tomcat, it is usually the $TOMCAT_HOME/temp directory.

The default logging configuration (log4j.xml bundled in the clover.war) may be changed to another log4j configuration file using system property log4j.configuration. If you override the configuration, only the properties from the new file are used.

The log4j.configuration should contain the URL of the new log4j configuration file, not a simple file system path, for example:



It is better to copy the original file and modify the copy, than to create a new file.

Please note that log4j.configuration is not a CloverDX Server configuration property, but a system property, thus it must be set on the JVM command line by -Dlog4j.configuration or in other way suitable for the application container. See the Installation chapter for more information on how to set a system property for each application container.

Since such a configuration overrides the default configuration, it may influence Graph run logs. So your own log configuration has to contain following fragment to preserve Graph run logs:

<logger name="Tracking" additivity="false">
  <level value="debug"/>

Another Useful Logging Settings

These system properties allow for logging of HTTP requests/responses to stdout:

Client side: (For more information, see the Integrating CloverDX Designer with CloverDX Server chapter of the CloverDX Designer User's Guide.)

Server side:

Access Log in Apache Tomcat

If you need to log all requests processed by the server, add the following code to $CATALINA_HOME/conf/server.xml.

<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
       prefix="localhost_access_log" suffix=".txt"
       pattern="%h %l %u %t %D %r %s %b" />

The format defined above has following meaning

[IP address] [date-time] [processing duration in milliseconds] [method] [URL] [protocol+version] [response code] [response size]

The log will look like the next line - - [13/Nov/2014:12:53:03 +0000] 2 "POST /clover/spring-rpc/clusterNodeApi HTTP/1.1" 200 1435"

See also Valve in documentation on Apache Tomcat.

Application Server Logs

If you use Apache Tomcat, it logs into $CATALINA_HOME/logs/catalina.out file.

Graph Run Logs

Each graph or jobflow run has its own log file – for example, in the Server Console, section Execution History.

By default, these log files are saved in the subdirectory cloverLogs/graph in the directory specified by system property.

It’s possible to specify a different location for these logs with the CloverDX graph.logs_path property. This property does not influence main Server logs.

Server Audit Logs

Server Audit Log logs operations called on ServerFacade and JDBC proxy interfaces.

Audit logging can be enabled by setting (adding) the value of CloverDX property logging.logger.server_audit.enabled to true. In server GUI, you can change the property value in ConfigurationSetupConfiguration File. Audit logging is disabled by default.

The name of output file is server-audit.log. The file is in the same directory as main server log files. Default log level is DEBUG, so all operations which may do any change or another important operations (e.g. login or openJdbcConnection) are logged. To enable logging of all operations, change log level to TRACE in the log4j configuration.

Each logged operation is logged by two messages: entering method and exiting method (if the exception is raised, it's logged instead of output parameters)

  • Entering method (marked as "inputParams"). All method's parameters (except for passwords) are printed.
  • Exiting method (marked as "outputParams"). Method's return value is printed.
  • Exception in method (marked as "EXCEPTION"). Exception's stacktrace is printed.

Message also contains:

  • username, if the user is known
  • client IP address, if it's known
  • cluster node ID
  • Interface name and the operation name

Values of transient and lazy initialized (in entity classes) fields and fields with binary content are not printed.

Designer-Server Integration Logs

The logging of Designer-Server integration can be enabled with logging.logger.server_integration.enabled configuration property. The name of the log file is server-integration.log.

The log format is date and time, IP address of Designer, user name, operation, result of the operation (success/failure) and duration in milliseconds.

2018-03-07 16:42:00,525 user=clover, operation=executeGraph SUCCESS duration=576 ms

Worker Log

Worker log logs operation performed by the Worker. The Worker is configured with a separate log4j.xml configuration file.