JVM File Descriptors Test

This test reports useful statistics pertaining to file descriptors.


This test will work only if the target Java application uses the JDK/JRE offered by one of the following vendors only: Oracle, Sun, OpenJDK. IBM JDK/JRE is not supported.

Target of the test : An IBM WebSphere Liberty server

Agent deploying the test : An internal agent

Outputs of the test : One set of results for the Java application being monitored.

Configurable parameters for the test
Parameter Description

Test period

How often should the test be executed.


The host for which the test is to be configured.


The port number at which the specified host listens to.

Service URL path

For the eG agent to collect metrics from the target IBM WebSphere Liberty server, the local connector should be enabled on the target server. Once the connector is enabled, a com.ibm.ws.jmx.local.address file will be created in the ${server.output.dir}/logs/state folder. The eG agent uses this file to connect to the target server and collect the required metrics from it. Therefore, specify the exact path to this file in the Service URL text box. For example, in case of Windows environments, the Service URL Path can be C:\wlp\usr\servers\server1\logs\state and in case of Linux environments, the Service URL Path can be /opt/wlp/ur/servers/server1/logs/state.


Specify the duration (in seconds) for which this test should wait for a response from the target Java application. If there is no response from the target beyond the configured duration, the test will timeout. By default, this parameter is set to 240 seconds.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Open file descriptors in JVM

Indicates the number of file descriptors currently open for the application.



Maximum file descriptors in JVM

Indicates the maximum number of file descriptors allowed for the application.



File descriptor usage by JVM

Indicates the file descriptor usage in percentage.