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Anmol_Bhardwaj
Community Advisor
Anmol_BhardwajCommunity Advisor
Community Advisor
July 1, 2021
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Can we achieve logging for AEM servlet methods?

  • July 1, 2021
  • 4 replies
  • 3651 views

Like we can log different results and entry points for OSGi services & components Can we achieve the same for servlets?

 

I know putting it simply in the doGet/doPost method won't work. Any suggestions?

 

Code:

private final Logger logger = LoggerFactory.getLogger(this.getClass()); ... @9944223 protected void doGet(final SlingHttpServletRequest req, final SlingHttpServletResponse resp) throws ServletException, IOException { ... logger.debug(...); }
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Best answer by Vijayalakshmi_S

Hi @anmol_bhardwaj,

From the code perspective in Servlet class,

  • cross check if you are using org.slf4j 
    • import org.slf4j.Logger;
    • import org.slf4j.LoggerFactory;
  • Log Level used in the code matters - debug/info which is related to the Logger config you created for your project. 

From Config standpoint,

  • if you are using project created using AEM project Maven archetype, you would have logger Factory config instance for your project (Core package name in general + log level + file name)
  • Given that you could see log messages for OSGi components/Services, I suggest to check the Servlet package family is part of the same and that is part of the Logger config and finally you are checking the respective file you are logging to. 

The config screenshot you have shared is OOTB entry for error.log file.

 

Highlighted in red is the factory config instance identifier for my project which logs (Information messages - log.info) all Java classes part of the Logger highlighted in green - com.aem.demoproject to the file named project-demoproject.log

 

4 replies

Ritesh_Mittal
Community Advisor and Adobe Champion
Ritesh_MittalCommunity Advisor and Adobe Champion
Community Advisor and Adobe Champion
July 1, 2021

Hi @anmol_bhardwaj ,

 

We can put logs inside servlets also (which are nothing but Java class only), and you can put them anywhere inside method. I am not sure why you mentioned that putting inside doGet and doPost method it will not work because it will. Are you facing any issue while putting inside those methods?

 

 

 

    Anmol_Bhardwaj
    Community Advisor
    Anmol_BhardwajCommunity AdvisorAuthor
    Community Advisor
    July 1, 2021

    Hi @353574,

    I tried putting logger inside my doGet method and was not able to see anything in the log files. I have used similar logger in OSGi components and it worked. I can see that the servlet is working properly but just the logs are not displayed in the log files.

    I have checked the log levels and they are also matching.

    B
    Adobe Employee
    BimmiSoAdobe Employee
    Adobe Employee
    July 1, 2021

    Hi @anmol_bhardwaj ,

     

    A servlet is also a java class and we can put loggers in it too.

    Can you explain more about what error/issue you are getting when adding loggers in servlet.

     

    Thanks 

      Dipti_Chauhan
      Community Advisor
      Dipti_ChauhanCommunity Advisor
      Community Advisor
      July 1, 2021

      HI @anmol_bhardwaj 

        Logger will work in servlet also same as any other Java class

      you can also validate your logger osgi configuration<Apache Sling Logging Logger> may be you have explicitly added your OSGI service java package and hence your servlet logs not getting printed on specific log file

        Anmol_Bhardwaj
        Community Advisor
        Anmol_BhardwajCommunity AdvisorAuthor
        Community Advisor
        July 2, 2021

        Hi @dipti_chauhan, Thanks. I have checked and I can say that I have not added any OSGi service package explicitly.

        This is the exact code I have been using

         

        private final Logger logger = LoggerFactory.getLogger(this.getClass()); ... @Override protected void doGet(final SlingHttpServletRequest req, final SlingHttpServletResponse resp) throws ServletException, IOException { ... logger.debug(...) }

         

         

        Vijayalakshmi_S
        Vijayalakshmi_SAccepted solution
        Level 10
        July 6, 2021

        Hi @anmol_bhardwaj,

        From the code perspective in Servlet class,

        • cross check if you are using org.slf4j 
          • import org.slf4j.Logger;
          • import org.slf4j.LoggerFactory;
        • Log Level used in the code matters - debug/info which is related to the Logger config you created for your project. 

        From Config standpoint,

        • if you are using project created using AEM project Maven archetype, you would have logger Factory config instance for your project (Core package name in general + log level + file name)
        • Given that you could see log messages for OSGi components/Services, I suggest to check the Servlet package family is part of the same and that is part of the Logger config and finally you are checking the respective file you are logging to. 

        The config screenshot you have shared is OOTB entry for error.log file.

         

        Highlighted in red is the factory config instance identifier for my project which logs (Information messages - log.info) all Java classes part of the Logger highlighted in green - com.aem.demoproject to the file named project-demoproject.log

         

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