spring-boot-rest/log-mdc/src/main/java/com/baeldung/ndc/controller/Log4JController.java

package com.baeldung.ndc.controller;

import org.apache.log4j.NDC;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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.baeldung.ndc.Investment;
import com.baeldung.ndc.service.InvestmentService;

@RestController
public class Log4JController {
    @Autowired
    @Qualifier("log4jInvestmentService")
    private InvestmentService log4jBusinessService;

    @RequestMapping(value = "/ndc/log4j", method = RequestMethod.POST)
    public ResponseEntity<Investment> postPayment(@RequestBody Investment investment) {
        // Add transactionId and owner to NDC
        NDC.push("tx.id=" + investment.getTransactionId());
        NDC.push("tx.owner=" + investment.getOwner());

        try {
            log4jBusinessService.transfer(investment.getAmount());
        } finally {
            // take out owner from the NDC stack
            NDC.pop();

            // take out transactionId from the NDC stack
            NDC.pop();

            NDC.remove();
        }
        return new ResponseEntity<Investment>(investment, HttpStatus.OK);
    }
}