Monitor JVM (memory utilization etc.) with JConsole on remote server

It's very common requirement to monitor the memory utilization by our application. This can be done with JConsole. We can monitor JVM on local machine or on remote machine with JConsole.
Firstly we have to run the JConsole, it can be done as:

1. Go to bin folder of your JDK and run the jconole.exe file.
2. Open command line and change directory to bin folder of JDK folder and write jconsole.exe and press enter.

Now you can monitor any local process as shown in above image or you can monitor any process on remote machine. Monitoring process on remote machine involves some additional steps, we consider here to monitor tomcat on remote server as:

1. Go to tomcat folder and locate setenv.bat file(if it does not exist then create an empty file in conf folder). Then add the below lines in setenv.bat file.

1. set CATALINA_OPTS=-Dcom.sun.management.jmxremote
     -Dcom.sun.management.jmxremote.port=PORT number
     -Dcom.sun.management.jmxremote.ssl=false
     -Dcom.sun.management.jmxremote.authenticate=false 

   If you want to further authenticate the monitoring then follow the link

   https://tomcat.apache.org/tomcat-8.0-doc/monitoring.html

    
2.  Restart tomcat server.
3. Open JConsole on you system. Select "Remote Process" and enter IP address of remote server with port you have given in step 1.
    
4. 

OTRS Rest API integration

OTRS is a tool to log tickets online. This is very basic requirement to log tickets and track them online. OTRS gives this functionality but if you want to integrate this functionality in you application then OTRS provide you with some basic API's like to create ticket, get ticket by id, update ticket, search ticket. Please follow below screenshots to enable in it your OTRS tool. Here we are assuming that OTRS tool is already installed.

1. Login in OTRS with admin user.

2. Goto "Admin" tab.


3. Find  WebService link as:



4. Click on WebService.



5. Click on "add web service".


6. Click on "Import web service"  and choose file from desktop (use Test.yaml file given below)
 

Test.yaml file

---
Debugger:
  DebugThreshold: debug
  TestMode: '0'
Description: Is used by me
FrameworkVersion: 4.0.5
Provider:
  Operation:
    TicketGet:
      Description: ''
      MappingInbound:
        Type: Simple
      MappingOutbound:
        Type: Simple
      Type: Ticket::TicketGet
    TicketUpdate:
      Description: ''
      MappingInbound:
        Type: Simple
      MappingOutbound:
        Type: Simple
      Type: Ticket::TicketUpdate
    TicketCreate:
      Description: ''
      MappingInbound:
        Type: Simple
      MappingOutbound:
        Type: Simple
      Type: Ticket::TicketCreate
    TicketSearch:
      Description: ''
      MappingInbound:
        Type: Simple
      MappingOutbound:
        Type: Simple
      Type: Ticket::TicketSearch
  Transport:
    Config:
      KeepAlive: ''
      MaxLength: '20000000'
      RouteOperationMapping:
        TicketGet:
          Route: /TicketGet/:TicketID
        TicketUpdate:
          RequestMethod:
          - POST
          Route: /TicketUpdate/:TicketID
        TicketCreate:
          RequestMethod:
          - POST
          Route: /TicketCreate
        TicketSearch:
          RequestMethod:
          - GET
          Route: /TicketSearch
    Type: HTTP::REST
RemoteSystem: ''
Requester:
  Transport:
    Type: ''

It will expose the web service and you can test it with any client tool like POSTMAN etc

You need to add parameter user name as UserLogin  and password as password to access any api.

Example of get API (GET)
 http://server address/otrs/nph-genericinterface.pl/Webservice/Test/TicketGet/Ticketno?UserLogin=username&Password=password

Example of Create API (POST)
http://server address/otrs/nph-genericinterface.pl/Webservice/Test/TicketCreate?UserLogin=user name&Password=password

JSON in Body as: 
 {
"Ticket" : {
"QueueID" : "1",
"PriorityID" : "5",
"CustomerUser" : "email id",
"Title" : "REST Create Test",
"State" : "open"
},
"Article" : {
"ContentType" : "text/plain; charset=utf8",
"Subject" : "Rest Create Test",
"Body" : "This is only a test"
}
}

Example of update API (POST)
http://server address/otrs/nph-genericinterface.pl/Webservice/Test/TicketUpdate/22645?UserLogin=user login&Password=password

JSON in Body as: 
 {
"Ticket" : {
"QueueID" : "1",
"PriorityID" : "5",
"CustomerUser" : "email id",
"Title" : "REST Create Test",
"State" : "open"
},
"Article" : {
"ContentType" : "text/plain; charset=utf8",
"Subject" : "Rest Create Test Update",
"Body" : "This is only a test updated"
}
}

Example of searc API
http://server address/otrs/nph-genericinterface.pl/Webservice/Test/TicketSearch?UserLogin=user name&Password=password