Live Monitoring Using the JMX Interface

JMX (Java Management Extensions API) allows you to monitor the status of your Confluence instance in real time. JMX uses objects called MBeans (Managed Beans) to expose data and resources from your application, providing useful data such as the resource usage of your instance and its database latency, allowing you to diagnose problems or performance issues.

In this page we'll guide you through how to use JConsole to monitor Confluence locally and remotely. JConsole is included in the Java Development Kit (JDK), but you can use any JMX client.

Monitor Confluence locally using JConsole

If you are troubleshooting a particular issue, or only need to monitor Confluence for a short time, you can use local monitoring. Local monitoring can have a performance impact on your server, so its not recommended for long term monitoring of your production system.

To monitor locally:

  1. Start JConsole (you'll find it in the bin directory of the JDK installation directory)

  2. Select Local Process.
  3. Select the Confluence process. It will be called something like org.apache.catalina.startup.Bootstrap start

See Using JConsole for more information on local monitoring.

Monitor Confluence remotely using JConsole

Remote monitoring is recommended for production systems, as it does not consume resources on your Confluence server.

To monitor remotely:

  1. Add the following properties to your setenv.sh / setenv.bat file. The port can be any port that is not in use.

    set CATALINA_OPTS=-Dcom.sun.management.jmxremote %CATALINA_OPTS%
    set CATALINA_OPTS=-Dcom.sun.management.jmxremote.port=8099 %CATALINA_OPTS%
  2. Decide how you will secure your remote connection. See Remote Monitoring and Management for more information. 
    Although it is possible to disable authentication, we do not recommend doing this on a production system.

  3. Start JConsole (you'll find it in the bin directory of the JDK installation directory).
  4. Select Remote Process.
  5. Enter your hostname and port (this is the port you specified earlier, not the Confluence port).
  6. Click Connect.

See Using JConsole for more information on remote monitoring.

Confluence MBeans

You can use the following Confluence MBeans to see live information about your Confluence instance.

CacheStatistics

This MBean shows information about Confluence caches. This info can also be found on the Cache Statistics page.

IndexingStatistics

This MBean shows information related to search indexing. Here's some useful attributes.

Property name

Function

Values

Flushing

Indicate whether the cache is currently flushing

True/False

LastElapsedMilliseconds

Time taken during last indexing

Milliseconds

TaskQueueLength

Shows number of tasks in the queue

Integer

ReIndexing  Indicates whether Confluence is currently reindexing True/False

SystemInformation

This MBean shows information such as the Confluence version and uptime. This info can also be found on the System Information page.  

Property name

Function

Values

DatabaseExampleLatency

Shows the latency of an example query performed against the database

Milliseconds

RequestMetrics

This MBean shows information related to system load and error pages served.

Property name

Function

Values

AverageExecutionTimeForLastTenRequests

Average execution time for the last ten requests.

Milliseconds

CurrentNumberOfRequestsBeingServed

Number of requests being served at this instant.

Integer

ErrorCount

Number of times the Confluence error page was served.

Integer

NumberOfRequestsInLastTenSeconds

The number of requests in the last ten seconds.

Integer

MailServer-SMTPServer

This MBean shows information related to email dispatch attempts and failures. There will be an MBean for every SMTP Mailserver that has been configured in the Confluence instance.

Property name

Function

Values

EmailsAttempted

The number of email messages Confluence has tried to send.

Integer

EmailsSent

The number of email messages sent successfully.

Integer

MailTaskQueue

This MBean shows information related to the email workload.

Property name

Function

Values

ErrorQueueSize

Number of errors in the queue.

Integer

Flushing

Shows state (i.e. flushing, or not)

True/False

FlushStarted

Time that operation began.

Time

RetryCount

The number of retries that were performed.

Integer

TaskSize

Number of email messages queued for dispatch.

Integer

SchedulingStatistics

This MBean shows information related to current jobs, scheduled tasks and the time that they were last run.

Property name Function Values
AllJobNames Shows information on current scheduled jobs including the time they were last run String
CurrentlyRunningJobNames Lists the scheduled jobs that are currently running List

Additional MBeans

To also monitor Hibernate and Hazelcast (Confluence Data Center only) you will need to add the following properties to your setenv.sh / setenv.bat file first. 

set CATALINA_OPTS=-Dconfluence.hazelcast.jmx.enable=true %CATALINA_OPTS%
set CATALINA_OPTS=-Dconfluence.hibernate.jmx.enable=true %CATALINA_OPTS%

This will make the Hibernate and Hazelcast MBeans available in your JMX client. 

Monitoring high CPU consuming threads

The Top Threads Plugin for JConsole is useful for monitoring whether the CPU is spiking. Use the following command to start JConsole with this plugin:

JConsole -pluginpath /pathto/topthreads.jar

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