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JMX-Based Monitoring

Java Management Extensions (JMX)

JMX is a technology that lets you implement management interfaces for Java applications. A management interface, as defined by JMX, is composed of named objects called MBeans (Management Beans). MBeans are registered with a name (an ObjectName) in an MBeanServer. To manage a resource or many resources in your application, you can write an MBean defining its management interface and register that MBean in your MBeanServer. The content of the MBeanServer can then be exposed through various protocols, implemented by protocol connectors, or protocol adaptors.

Configuring JMX in MWARE IAM

JMX can be enabled separately for the various datasources that are used by MWARE IAM. Once JMX is enabled, you can log in to the JConsole tool and monitor your MWARE IAM instance as explained in the Monitoring MWARE IAM with JConsole section.

Configuring JMX ports for the server

The default JMX ports (RMIRegistryPort and the RMIServerPort) are configured in the deployment.toml file (stored in the <IS_HOME>/repository/conf directory) as shown below. If required, you can update these default values.

[monitoring.jmx]
rmi_registry_port = "9999"

[monitoring.jmx]
rmi_server_port = "11111"

Enable JMX for the server

You can enable the JMX server by setting the following property to true in the deployment.toml file.

[monitoring.jmx]
rmi_server_start = true

Enable JMX for a datasource

You can enable JMX for a datasource by adding the jmxEnabled as true element to the datasource configuration. For example, to enable JMX for the default Carbon datasources, add the following property to the deployment.toml file (stored in the <IS_HOME>/repository/conf/ directory).

For IDENTITY_DB

[database.identity_db.pool_options]
jmxEnabled = true

For SHARED_DB

[database.shared_db]
...
jmx_enable = true

Monitor MWARE IAM with JConsole

Jconsole is a JMX-compliant monitoring tool which comes with the Java Development Kit (JDK) 1.5 and newer versions. You can find this tool inside your <JDK_HOME>/bin directory. See the instructions on Installing the JDK for more information.

Start MWARE IAM with JMX

  1. Open a command prompt and navigate to the <IS_HOME>/bin directory.

  2. Execute the MWARE IAM startup script and start the server.

    wso2server.sh
    wso2server.bat

    Tip

    If JMX is enabled, the JMX server URL will be published on the console when the server starts as shown below.

    INFO {org.wso2.carbon.core.init.CarbonServerManager} -  JMX Service URL  : service:jmx:rmi://<your-ip>:11111/jndi/rmi://<your-ip>:9999/jmxrmi

Once MWARE IAM has started, you can start the JConsole tool as follows.

  1. Open a command prompt and navigate to the <JDK_HOME>/bin directory.

  2. Execute the jconsole command to open the log-in screen of the Java Monitoring & Management Console as shown below.

    Java monitoring and management console

  3. Enter the connection details in the above screen as follows:

    1. Enter the JMX server URL in the Remote Process field. This URL is published on the command prompt when you start the WSO2 server as explained above.

      Tip

      If you are connecting with a remote IP address instead of localhost, you need to bind the JMX service to the externally accessible IP address by adding the following system property to the product startup script stored in the <IS_HOME>/bin directory (wso2server.sh for Linux and wso2server.bat for Windows). 

      -Djava.rmi.server.hostname=<IP_ADDRESS_WHICH_YOU_USE_TO_CONNECT_TO_SERVER>

      Be sure to restart the server after adding the above property.

    2. Enter values for the Username and Password fields to log in.

      Tip

      If you are logging in as the administrator, you can use the same administrator account that is used to log in to the MWARE IAM console (admin/admin).

      Note

      Make sure that the user ID you are using for JMX monitoring is assigned a role that has the Server Admin permission. See Configuring Roles for further information about configuring roles assigned to users. Any user assigned to the admin role can log in to JMX.

  4. Click Connect to open the Java Monitoring & Management Console. The following tabs will be available. See the Oracle documentation on using JConsole for more information on these tabs.

    • Overview:

      Jconsole overview tab

    • Memory:

      Jconsole memory tab

    • Threads:

      Jconsole threads tab

    • Classes:

      Jconsole classes tab

    • VM: Jconsole VM tab

    • MBeans:

      Jconsole mbeans tab

Use the ServerAdmin MBean

When you go to the MBeans tab in the JConsole, the ServerAdmin MBean will be listed under the &org.wso2.carbon domain as shown below.

Mbeans tab

The ServerAdmin MBean is used for administering the MWARE IAM instance. There are several server attributes such as ServerStatus, ServerData, and ServerVersion.

The ServerStatus attribute can take any of the following values.

  • RUNNING
  • SHUTTING_DOWN
  • RESTARTING
  • IN_MAINTENANCE

ServerStatus

The ServerAdmin MBean has the following operations:

Operation Description
shutdown Forcefully shut down the server.
restart Forcefully restart the server.
restartGracefully Wait till all current requests are served and then restart.
shutdownGracefully Wait till all current requests are served and then shutdown.
startMaintenance Switch the server to maintenance mode. No new requests will be accepted while the server is in maintenance.
endMaintenance Switch the server to normal mode if it was switched to maintenance mode earlier.

ServerAdmin

Use the ServiceAdmin MBean

This MBean is used for administering services deployed in MWARE IAM. Its attributes are as follows:

Attribute Description
NumberOfActiveServices The number of services which can currently serve requests
NumberOfInactiveServices The number of services which have been disabled by an administrator
NumberOfFaultyServices The number of services which are faulty

ServiceAdmin MBean attributes

The operations available in the ServiceAdmin MBean:

Operation Description
startService [p1:string] The p1 parameter is the service name. You can activate a service using this operation.
stopService [p1:string] The p1 parameter is the service name. You can deactivate/disable a service using this operation.

ServiceAdmin MBean operations

Use the StatisticsAdmin MBean

This MBean is used for monitoring system and server statistics. Its attributes are as follows.

Attributes Description
AvgSystemResponseTime This is the average response time for all the services deployed in the system. The beginning of the measurement is the time at which the server started.
MaxSystemResponseTime This is the maximum response time for all the services deployed in the system. The beginning of the measurement is the time at which the server started.
MinSystemResponseTime This is the minimum time for all the services deployed in the system. The beginning of the measurement is the time at which the server started.
SystemFaultCount The total number of faults that occurred in the system since the server was started
SystemRequestCount The total number of requests that has been served by the system since the server was started
SystemResponseCount The total number of responses that have been sent by the system since the server was started

StatisticsAdmin attributes

Operations available in the Statistics MBean:

Operation Description
getServiceRequestCount (p1:string) The p1 parameter is the service name. You can get the total number of requests received by this service since the time it was deployed, using this operation.
getServiceResponseCount (p1:string) The p1 parameter is the service name. You can get the total number of responses sent by this service since the time it was deployed, using this operation.
getServiceFaultCount (p1:string) The p1 parameter is the service name. You can get the total number of fault responses sent by this service since the time it was deployed, using this operation.
getMaxServiceResponseTime (p1:string) The p1 parameter is the service name. You can get the maximum response time of this service since deployment.
getMinServiceResponseTime (p1:string) The p1 parameter is the service name. You can get the minimum response time of this service since deployment.
getAvgServiceResponseTime (p1:string) The p1 parameter is the service name. You can get the average response time of this service since deployment.
getOperationRequestCount (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the total number of requests received by this operation since the time its service was deployed.
getOperationResponseCount (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the total number of responses sent by this operation since the time its service was deployed.
getOperationFaultCount (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the total number of fault responses sent by this operation since the time its service was deployed.
getMaxOperationResponseTime (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the maximum response time of this operation since deployment.
getMinOperationResponseTime (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the minimum response time of this operation since deployment.
getAvgOperationResponseTime (p1:string, p2:string) The p1 parameter is the service name. The p2 parameter is the operation name. You can get the average response time of this operation since deployment.

Statistics Mbean operations

Use the DataSource MBean

If you have JMX enabled for a datasource connected to the MWARE IAM instance, you can monitor the performance of the datasource using this MBean. The DataSource MBean will be listed as shown below.

Datasource Mbean

For example, if you have JMX enabled for the default Carbon datasources in the deployement.toml file, the JDBC connection pool parameters that are configured for the Carbon datasource will be listed as attributes as shown below. See the performance tuning guide for instructions on how these parameters are configured for a datasource.

Datasource performance tuning

Monitor MWARE IAM with Jolokia

Jolokia is a JMX-HTTP bridge, which is an alternative to JSR-160 connectors. It is an agent-based approach that supports many platforms. In addition to basic JMX operations, it enhances JMX monitoring with unique features like bulk requests and fine-grained security policies.

Follow the steps below to use Jolokia to monitor MWARE IAM.

  1. Download Jolokia OSGi Agent. (These instructions are tested with the Jolokia OSGI Agent version 1.3.6 by downloading the jolokia-osgi-1.3.6.jar file.)

  2. Add it to the <IS-HOME>/repository/components/dropins/ directory.

  3. Start MWARE IAM.

Once the server starts, you can read MBeans using Jolokia APIs.

Following are a few examples.

  • List all available MBeans: http://localhost:9763/jolokia/list (Change the appropriate hostname and port accordingly)
  • Reading Heap Memory: http://localhost:9763/jolokia/read/java.lang:type=Memory/HeapMemoryUsage

For more information on the JMX MBeans that are available in MWARE IAM, see Monitoring MWARE IAM with JConsole.

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