SpringBoot - Loggers

By default slf4jcan be used for logging.

Changes required -
1. Define Logger object in the class
2. Use the Logger with appropriate level (info, debug, etc.)
3. Set the file name and path in application.properties to write to a specific file.

application.properties
logging.file.name=logs/restapp.log 
     
all the logs will be writted to restapp.log file under logs folder, of the application.

To change/restrict the log level to be printed in the log files, set the below property in application.properties file

application.properties    
      logging.level.root=error
          or
      logging.level.root=info
      logging.level.com.raj.*=error                         (To enable for a custom package)
           or 
      logging.level.root=info
      logging.level.org.springframework.*=error      (To enable for a framework)


Controller class

package com.raj.springweb.controllers;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.raj.springweb.model.Product;
import com.raj.springweb.repos.ProductJpaRepository;

@RestController
public class RestProductController {
   
    @Autowired
    ProductJpaRepository productRepo;
   
    private static final Logger LOGGER = LoggerFactory.getLogger(RestProductController.class);
   
    @RequestMapping (value="/productapi/allproducts", method=RequestMethod.GET)
    public List findAllProducts () {
        LOGGER.info("Find All Products");
        return productRepo.findAll();
    }
}