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Monitoring – JCmon Locate the document in its SAP Library structure
Use
The JCmon is a native monitoring program, part of the startup and control framework, which can be used to:
· Display a list of the processes
· Enable, disable, and restart the specified processes
· Shutdown a specified J2EE instance
· Enable/disable debugging for a specified process
· Dump stack trace
· Display a list of the ports used by the J2EE Engine
· Activate/deactivate debug sessions
· Increment/decrement the trace level

To start the JCmon, execute the jcmon script file from the /usr/sap/<SID>/<INSTANCE NAME>/j2ee/os_libs directory, where <SID> is the system ID of the cluster (for example, C11) and <INSTANCE NAME> is the instance name of the J2EE instance (for example, JC00). The instance name consists of a prefix (JC or J) and the two-digit instance number afterwards. As parameter for the jcmon script file specify the SAP instance profile:

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jcmon pf=/usr/sap/<SID>/sys/profile/<SAPSID>_<INSTANCE_ID>_<HOST>.

Example:

jcmon pf=/usr/sap/C11/sys/profile/C11_JC00_testpc.

Enter command ‘20’ to display the main menu.
Features

The JCmon main menu provides the following functions:

0: Exit

Returns back to the main menu.
1: Refresh list
Refreshes the process list and the menu.
2: Shutdown instance
Invokes the shutdown of the specified J2EE instance.
3: Enable process
Enables and starts a process, which is switched off. (Restart == no)
4: Disable Process
Stops a running process and switches off the restart flag.
5: Restart Process
Restarts the specified process.
6: Enable bootstrapping on restart
7: Disable bootstrapping on restart
8: Enable Debugging
Checks if the specified process is running in debug mode. If not and the process is configured for debugging, JControl will restart the process in debug mode.
9: Disable Debugging
If the process is running in debug mode, JControl will restart the process and switch off the debug mode.
10: Dump stack trace
The specified process gets an event to invoke the dump of the stack trace of the Java VM. The stack trace is stored in the stderr<n> output file in the work directory.
11: Process list
Displays the status and additional information about all the processes.
12: Port list
Displays a list with detailed information about the ports used by the J2EE Engine.
13: Activate debug session
Activates the debug session for the specified process. To activate a debug session:
· The process must be running in debug mode.
· The process must be “Load Balance Restricted”.
14: Deactivate debug session
Deactivates the debug session. The process will be restarted or stopped – this depends on the process configuration.
15: Increment trace level
This increments the trace level for the developer trace file of the specified process (dev_<component name>)
16: Decrement trace level
This decrements the trace level for the developer trace file of the specified process (dev_<component name>)
17: Enable process restart
18: Disable process restart
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98: Synchronize instance properties
99: Extended process list on/off

Activities

For more information, see:

· Checking that all processes are running

· Restarting a single process