Install Java Agent on Glassfish server 3.x & above

Extract the zip file to a new directory outside the glassfish server directory.
Open apminsight.conf file in any text editor and add license.key value, which can be obtained from Site24x7 APM Insight page. Refer here to fine tune the agent settings.
Open the administrative console of your glassfish server. Select Configurations and select the configuration used by the server.
Select JVM Settings > Add JVM Option, then add the following parameter:

-javaagent:<agent_directory_full_path>/apminsight-javaagent.jar
For Example: -javaagent:D:/apminsight/apminsight-javaagent.jar
Open the osgi configuration file, which can be found in either of the paths
/glassfish/config/osgi.properties
or/glassfish/osgi/felix/conf/config.properties
Find the key org.osgi.framework.bootdelegation and append com.manageengine.* to the existing values
Click Save button and start the glassfish server

Extract the zip file to a new directory outside the glassfish server directory
Copy the apminsight-javaagent.jar file from above directory to <GLASSFISH_HOME>\glassfish\domains\<domain>\lib\ext directory of the domain server.
Create a new directory named "apminsight" under <GLASSFISH_HOME>\glassfish\nodes\<node>\<instance> in instance server and copy only the agent conf files to this directory.
Open apminsight.conf file in any text editor and add license.key value, which can be obtained from Site24x7 APM Insight page. Refer here to fine tune the agent settings.
Repeat the above step to add the java agent for every instance.
Open the administrative console of your glassfish server. Select Configurations and select the configuration used by the cluster.
Select JVM Settings > Add JVM Option, then add the following parameters as such

-javaagent:${com.sun.aas.instanceRoot}/lib/ext/apminsight-javaagent.jar
-Dapminsight.home=${com.sun.aas.instanceRoot}/apminsight
Click Save button and start the glassfish cluster