This section explains how to configure the XAP logging. You can format the log output, choose file names, and define rollover policies.
Some of the features discussed on this page are not part of the open-source edition, and are only available in the licensed editions (starting with XAP Premium).
XAP makes logging calls using the Java platform’s core logging facilities. For a detailed explanation of the Java logging framework, refer to Java Logging Overview on the Oracle website.
The logging configuration is initialized using a configuration file that is read at startup. This configuration file is in the standard
java.util.Properties format. It configures custom versions of both
java.util.logging.Formatter, and default levels for frequently used loggers (categories).
The default XAP logger configuration file is located under:
Overriding the Default Configuration
The configuration defined in the
xap_logging.properties file may be overridden either by using system properties, or by providing an external configuration file with overrides. This external configuration file should be located in the classpath under:
Any configuration that you want to override in the
xap_logging.properties file, should appear in
xap_logging_ext.properties with its new value. The same applies for system properties, for example:
The recommended way to define system properties when starting service grid components is to wrap the original script, e.g.
gsc.sh(bat) with a wrapper script which include the EXT_JAVA_OPTIONS variable. The
setenv.sh(bat) script, which is used by these components, will pick these options automatically and use them as JVM arguments.
Overriding the Configuration File
Your own configuration file may also be used instead of the platform’s default. This is done by setting the configuration file location using a system property:
XAP scripts rely on the exported environment variable
GS_LOGGING_CONFIG_FILE (declared in
<XAP-HOME>/bin/setenv script). The preferred way to apply your override file is to use a wrapper script; export the new setting of this variable and call the original script. This ensures that when
setenv.sh(bat) is called from within the platform’s scripts, it will pick up the override.
# unix export XAP_LOGS_CONFIG_FILE=myfile.properties ./gsc.sh
If your application initializes the logging facility via the Logging API (e.g.
LogManager.readConfiguration(InputStream ins)), you may want to disable the XAP configuration altogether. When the XAP logging configuration is disabled, your Java logging settings take their place. This is done using the following system property:
To troubleshoot and detect which logging properties file was loaded and from where, set the following system property to true. This property already exists in the scripts (for convenience) and by default is set to false.
Verbose System Report
Whenever a service grid component is started, it prints a system report in its log file. Increasing the log level from INFO to CONFIG or beyond will generate a verbose report and include all system properties and environment variables, which can be useful for troubleshooting.
For example, to enable a verbose system report for GSC, change the following log level:
com.gigaspaces.grid.gsc.level = CONFIG
Out of the box, XAP configures its logging with two log Handlers,
java.util.logging.ConsoleHandler- A simple handler for writing formatted output to System.err (level is set to ALL).
com.gigaspaces.logger.RollingFileHandler- A handler that writes formatted output to a file that rolls over if a certain policy is triggered. Refer to Managing Log Files.
Java util logging supports other handlers. MemoryHandler, SocketHandler or any other handler can be used instead of the above. For more information about handlers, refer to this Oracle topic on logging. You can also use one of the open source logging frameworks that supports java.util.logging.
Formatters are in charge of formatting the log messages and adding metadata to them (date, time, level, etc).
XAP configures the logging handler’s
formatter property with a single
Formatter implementation class:
com.gigaspaces.logger.GSSimpleFormatter. This formatter class is based on the
java.util.logging.SimpleFormatter class. Refer to Formatting Log Messages for more details.
XAP prints exception stack traces for log messages with level
SEVERE or higher.
com.gigaspaces.exceptions.level = SEVERE
Messages with lower levels will only be logged with the exception’s
toString() value. To force the logger to print the stack trace of exceptions with lower levels, such as Level
WARNING, set the
com.gigaspaces.exceptions.level property to
The stack trace of a
java.lang.RuntimeException is always be logged, regardless of the level definition.
Logging Management at Runtime
You can change various logger level settings while the system is up and running, without having to restart. This can be very useful in production environments when you have to troubleshoot the system, but cannot restart it.
To do this, connect to the JMX Bean of the Java logging facility via a monitoring tool such as JConsole. You can start JConsole for a specific running GSC or GSM using the XAP Management Center (
To change the logging level in JConsole
- Traverse to the MBeans tab.
- Expand the
java.util.loggingtree node and locate the Logging tree node.
- Select the Operations tab.
- Type the logger’s name and level for the arguments of the
setLoggerLevel()method. For example, If you want to change
You must use the logging level without the .level string, for example
com.gigaspaces.core.cluster.replication, and set the value to
The LoggingMXBean enables you to:
- Get the name of the log level associated with the specified logger.
- Get the list of currently registered loggers.
- Get the name of the parent for the specified logger.
- Set the specified logger to the specified new level.
The logging level class defines a set of standard logging levels that can be used to control logging output. The logging levels are ordered, and are specified by ordered integers/constants.
Enabling logging at a given level also enables logging at all higher levels.
The supported logging levels (in descending order) are:
- SEVERE (highest value)
- FINEST (lowest value)
In addition, there is a level OFF that can be used to turn off logging, and a level ALL that can be used to enable logging of all messages.
The following logging categories are supported:
- Communication Protocol
- Class Loader
- Space (Caching, Query, Replication, etc)
- Runtime (GCC, GSM, etc)
- Web Container
- Mule Integration
For each category, there are specific logger names you should use when configuring the logging level. See the
xap_logging.properties file for the exact logger names supported for each category. You can also find all logger names in the
the following sections describe the different modules, their logging names, and their default logging levels.
com.gigaspaces.client.level = INFO com.gigaspaces.client.cluster.liveness.level = INFO
The GigaSpaces Client can be another component or application that connects to a GigaSpaces cluster. Liveness check is functionality that runs inside a GigaSpaces proxy (usually held by a client connecting to a Space) to keep track of the cluster members. Additional information about the GigaSpaces proxy can be found here.
The logging configuration file includes declarations of the loggers available at the bridge between .NET and Java.
com.gigaspaces.externaldatasource.dotnet.level = INFO com.gigaspaces.bridge.dispatcher.level = INFO com.gigaspaces.bridge.pbsexecuter.level = INFO com.gigaspaces.dotnet.pu.level = INFO
org.openspaces.level = INFO
OpenSpaces wraps the core product with Spring, which enables applying Spring configuration and the Spring life cycle to XAP applications.
org.openspaces.pu.container.support.level = WARNING org.openspaces.pu.container.jee.context.ProcessingUnitWebApplicationContext.level = WARNING
GigaSpaces Spring application logging
com.gigaspaces.spring.level = WARNING
org.hibernate.level = WARNING
com.gigaspaces.jms.level = INFO
com.gigaspaces.lrmi.nio.filters.SSLFilterFactory.level = INFO com.gigaspaces.lrmi.level = INFO com.gigaspaces.lrmi.stubcache.level = INFO com.gigaspaces.lrmi.context.level = INFO com.gigaspaces.lrmi.marshal.level = INFO com.gigaspaces.lrmi.watchdog.level = INFO com.gigaspaces.lrmi.classloading.level = INFO com.gigaspaces.lrmi.slow_consumer.level = INFO com.gigaspaces.lrmi.exporter.level = INFO com.gigaspaces.lrmi.communication.transport.level = INFO com.gigaspaces.lrmi.communication.manager.level = INFO com.gigaspaces.lrmi.channel.transport.level = INFO com.gigaspaces.lrmi.channel.manager.level = INFO com.gigaspaces.lrmi.channel.protocol.level = INFO
com.gigaspaces.core.classloadercleaner.level = INFO com.gigaspaces.core.classloadercache.level = INFO
XAP applications run as part of a XAP runtime container, and are packaged using the structure described here. Application JARs/classes are packaged in different folders, and some of the classes may be loaded as part of GigaSpaces containers (GSCs). There are multiple class loaders involved when an application is running. More information about the class loaders and their hierarchy can be found here.
Core and Kernel
com.gigaspaces.core.engine.level = INFO com.gigaspaces.core.lease.level = INFO com.gigaspaces.core.types.level = INFO com.gigaspaces.memory-manager.level = INFO com.gigaspaces.kernel.level = CONFIG com.gigaspaces.core.common.level = INFO com.gigaspaces.core.config.level = CONFIG com.gigaspaces.container.level = INFO
Core runtime for the GigaSpaces Space component. The above loggers relate to this component and some aspects of this engine, including lease, object types, and Memory Manager.
com.gigaspaces.filters.level = INFO
The Space filters are described here Java version | .NET version.
com.gigaspaces.persistent.level = INFO com.gigaspaces.persistent.shared_iterator.level = INFO org.hibernate.level = WARNING
The GigaSpaces persistence options are explained here Java version | .NET version. One of the packaged External Data Source implementations uses Hibernate. It is called Hibernate External Data Source, which is described here.
com.gigaspaces.query.level = INFO
XAP supports SQL queries on data in the Space, and the logger corresponds to this functionality Java version | .NET version.
LRU and Eviction
com.gigaspaces.cache.level = INFO
More information about the LRU policy and eviction behavior is available here.
com.gigaspaces.core.notify.level = INFO
The Notification mechanism can be used to identify events related to Space data (write, update, take, etc). Notifications are typically used with a Notify Container. Notifications can also be used via Session-based messaging, which is discussed in detail here.
com.gigaspaces.core.fifo.level = INFO
FIFO functionality is applicable for write, read and event (notifications), and is discussed in detail here Java version | .NET version.
com.gigaspaces.core.cluster.replication.level = INFO com.gigaspaces.core.cluster.replication.redolog.level = INFO com.gigaspaces.core.cluster.sync_replication.level = INFO
When a cluster topology is replicated, the replication functionality is enabled. More information about topologies is available here.
Replication between Spaces is one of the core features of XAP, and is explained in detail here.
com.gigaspaces.core.cluster.partition.level = INFO
When a cluster uses partitioned topology, the data is partitioned across multiple Space instances. More information about topologies is available here.
com.gigaspaces.cluster.active_election.level = INFO
When there are multiple instances (primary/backup(s)), an Active-Election process is used by the cluster members to determine which member acts as the primary instance. Additional information regarding the Active-Election process is available here.
com.gigaspaces.pojo.level = INFO
This logger corresponds to XAP POJO support. More information is available here.
com.gigaspaces.core.xa.level = INFO
This logger corresponda to the XA Transaction manager running in the Space. More information is available here Java version | .NET version.
Jini Dist. TX Manager
com.sun.jini.mahalo.startup.level = INFO com.sun.jini.mahalo.destroy.level = INFO
This logger is for the Jini Distributed Transaction manager. More information is available here Java version | .NET version.
SpaceURL, SpaceValidator, SpaceURLParser
com.gigaspaces.common.spaceurl.level = INFO com.gigaspaces.common.spacefinder.level = INFO com.gigaspaces.common.lookupfinder.level = INFO com.gigaspaces.common.resourceloader.level = INFO
The SpaceURL and its constraints are explained here Java version | .NET version. Other loggers are related to this one, and are applicable when a client is trying to create a Space proxy using a URL.
com.gigaspaces.worker.multicast.level = INFO
Space notifications support multicast mode, and this logger corresponds to multicast functionality.
Service Container - General
com.gigaspaces.grid.space.SpaceHandler.level = FINE org.jini.rio.level = INFO com.gigaspaces.start.level = CONFIG com.gigaspaces.grid.space.GigaSpacesFaultDetectionHandler.level=INFO com.gigaspaces.grid.lookup.level = INFO com.gigaspaces.management.level = INFO
com.gigaspaces.core.lookupmanager.level = INFO com.sun.jini.reggie.level = INFO net.jini.discovery.LookupLocatorDiscovery.level = INFO net.jini.lookup.ServiceDiscoveryManager.level = INFO net.jini.discovery.LookupDiscovery.level = INFO net.jini.lookup.JoinManager.level = INFO net.jini.config.level = WARNING com.sun.jini.start.service.starter.level = INFO com.sun.jini.thread.TaskManager.level = INFO
The Lookup Service (LUS) is a runtime registry of GigaSpaces components. Each component registers itself to a LUS, which provides visibility to other components. For example, a GSM discovers a GSC by looking at an entry in the LUS, and a GSC discovers a GSM in a similar way. More information about the LUS is available here.
com.gigaspaces.grid.gsm.level = INFO com.gigaspaces.grid.gsm.peer.level = INFO com.gigaspaces.grid.gsm.feedback.level = INFO com.gigaspaces.grid.gsm.provision.level = INFO com.gigaspaces.grid.gsm.services.level = INFO com.gigaspaces.grid.gsm.service-instances.level = INFO com.gigaspaces.grid.gsm.selector.level = INFO org.jini.rio.tools.webster.level = INFO
The GigaSpaces Manager (GSM) manages the applications and maintains the SLAs for deployments. More information about the GSM is available here.
com.gigaspaces.grid.gsc.level = INFO com.gigaspaces.grid.gsc.GSCFaultDetectionHandler.level = INFO com.gigaspaces.grid.gsm.GSMFaultDetectionHandler.level = INFO org.openspaces.pu.container.servicegrid.PUFaultDetectionHandler.level = INFO
The GigaSpaces Container (GSC) is the runtime environment for GigaSpaces applications. More information about GSCs is available here.
org.openspaces.grid.esm.level = INFO
The Elastic Service Manager (ESM) is an implementation of the Elastic Middleware Services. It is built on top of the existing administrative API exposed by the GigaSpaces components. See the Elastic Service Manager page for more details.
com.gigaspaces.grid.gsa.level = INFO
The GigaSpaces Agent (GSA) acts as a process manager that can spawn and manage Service Grid processes (operating-system-level processes), such as the GigaSpaces Manager (GSM), GigaSpaces Container (GSC), and Lookup Service (LUS). More information about the GSA is available here.
com.gigaspaces.replication.channel.level = INFO com.gigaspaces.replication.channel.verbose.level = INFO com.gigaspaces.replication.replica.level = INFO com.gigaspaces.replication.node.level = INFO com.gigaspaces.replication.router.level = INFO com.gigaspaces.replication.group.level = INFO com.gigaspaces.replication.backlog.level = INFO
com.gigaspaces.metrics.manager.level = INFO com.gigaspaces.metrics.registry.level = INFO com.gigaspaces.metrics.sampler.level = INFO
com.gigaspaces.security.level = INFO
This logger corresponds to the security of GigaSpaces components. This includes configuration and runtime execution of security functionality. More information regarding GigaSpaces security is available here.
Any web application default logging level (the logger name for web applications is web.
[processing unit name].[instance id]).
web.level = INFO org.mortbay.level = WARNING
XAP uses a Jetty container to provide support for Web applications. These loggers correspond to the Web Container. More information about GigaSpaces Web Application support is available here.
org.mule.level = WARNING org.mule.MuleServer.level = INFO org.mule.RegistryContext.level = INFO org.openspaces.esb.mule.level = WARNING
These loggers correspond to the Mule integration. More information about Mule integration is available in the Mule ESB and Mule Processing Unit topics.
For GUI, browser, cluster view, and JMX logging:
com.gigaspaces.admin.level = INFO com.gigaspaces.admin.ui.level = INFO com.gigaspaces.admin.ui.cluster.view.level = INFO com.gigaspaces.admin.ui.spacebrowser.level = INFO com.gigaspaces.admin.cli.level = INFO com.gigaspaces.jmx.level = INFO
These loggers correspond to the XAP Management Center. Additional information regarding the user interface is available here.
For persistence logging:
com.gigaspaces.persistent.level = INFO com.gigaspaces.persistent.shared_iterator.level = INFO