diff --git a/log-mdc-ndc/pom.xml b/log-mdc-ndc/pom.xml
index 8e9d52a750..927473ad4e 100644
--- a/log-mdc-ndc/pom.xml
+++ b/log-mdc-ndc/pom.xml
@@ -6,53 +6,53 @@
 	<version>0.0.1-SNAPSHOT</version>
 	<name>logmdcndc</name>
 	<description>tutorial on logging with MDC and NDC</description>
-	
+
 	<dependencies>
-	
-	    <dependency>
-	        <groupId>org.springframework</groupId>
-	        <artifactId>spring-context</artifactId>
-	        <version>4.3.3.RELEASE</version>
-	    </dependency>
-	    <dependency>
-	        <groupId>org.springframework</groupId>
-	        <artifactId>spring-webmvc</artifactId>
-	        <version>4.3.3.RELEASE</version>
-	    </dependency>	    
-	
+
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-context</artifactId>
+			<version>4.3.3.RELEASE</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-webmvc</artifactId>
+			<version>4.3.3.RELEASE</version>
+		</dependency>
+
 		<!--log4j dependencies -->
 		<dependency>
 			<groupId>log4j</groupId>
 			<artifactId>log4j</artifactId>
 			<version>1.2.17</version>
 		</dependency>
-		
-        <!--log4j2 dependencies-->
-        <dependency>
-            <groupId>org.apache.logging.log4j</groupId>
-            <artifactId>log4j-api</artifactId>
-            <version>2.7</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.logging.log4j</groupId>
-            <artifactId>log4j-core</artifactId>
-            <version>2.7</version>
-        </dependency>
-        
-		<!--disruptor for log4j2 async logging-->
-        <dependency>
-            <groupId>com.lmax</groupId>
-            <artifactId>disruptor</artifactId>
-            <version>3.3.4</version>
-        </dependency>
-        
-        <!--logback dependencies-->
-        <dependency>
-            <groupId>ch.qos.logback</groupId>
-            <artifactId>logback-classic</artifactId>
-            <version>1.1.7</version>
-        </dependency>        
-        
+
+		<!--log4j2 dependencies -->
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-api</artifactId>
+			<version>2.7</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-core</artifactId>
+			<version>2.7</version>
+		</dependency>
+
+		<!--disruptor for log4j2 async logging -->
+		<dependency>
+			<groupId>com.lmax</groupId>
+			<artifactId>disruptor</artifactId>
+			<version>3.3.4</version>
+		</dependency>
+
+		<!--logback dependencies -->
+		<dependency>
+			<groupId>ch.qos.logback</groupId>
+			<artifactId>logback-classic</artifactId>
+			<version>1.1.7</version>
+		</dependency>
+
 	</dependencies>
 
 </project>
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/GenericApp.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/GenericApp.java
index 3652032e0e..9f08e33455 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/GenericApp.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/GenericApp.java
@@ -6,20 +6,27 @@ import java.util.concurrent.Executors;
 import org.apache.log4j.Logger;
 
 import com.baeldung.mdc.log4j.Log4JRunnable;
+import com.baeldung.mdc.log4j2.Log4J2Runnable;
+import com.baeldung.mdc.slf4j.Slf4jRunnable;
 
 public class GenericApp {
-		
-	public static void main(String[] args) {
-		
-		ExecutorService executor = Executors.newFixedThreadPool(3);
-		TransactionFactory transactionFactory = new TransactionFactory();
-		
-		for(int i=0; i<10; i++){
-			final Transaction tx = transactionFactory.newInstance();
-			executor.submit(new Log4JRunnable(tx));
-		}
-		
-		executor.shutdown();
-				
-	}
+
+    public static void main(String[] args) {
+
+        ExecutorService executor = Executors.newFixedThreadPool(3);
+        TransactionFactory transactionFactory = new TransactionFactory();
+
+        for (int i = 0; i < 10; i++) {
+            final Transaction tx = transactionFactory.newInstance();
+            
+            //Runnable task = new Log4JRunnable(tx);
+            //Runnable task = new Log4J2Runnable(tx);
+            Runnable task = new Slf4jRunnable(tx);
+            
+            executor.submit(task);
+        }
+
+        executor.shutdown();
+
+    }
 }
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/TransactionFactory.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/TransactionFactory.java
index 26039ba1d4..2ae0b3d3f5 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/TransactionFactory.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/TransactionFactory.java
@@ -8,9 +8,10 @@ import java.util.UUID;
 public class TransactionFactory {
 
 	private static final String[] NAMES = {"John", "Susan", "Marc", "Samantha"};
+	private static long nextId = 1;
 	
 	public Transaction newInstance() {
-		String transactionId = UUID.randomUUID().toString();
+		String transactionId = String.valueOf( nextId++ );
 		String owner = NAMES[ (int) floor(random()*NAMES.length) ];
 		long amount = (long) (random()*1500 + 500);
 		Transaction tx = new Transaction(transactionId, owner, amount);
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JBusinessService.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JBusinessService.java
index c7d5c6904a..26633e229e 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JBusinessService.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JBusinessService.java
@@ -1,22 +1,21 @@
 package com.baeldung.mdc.log4j;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import org.apache.log4j.Logger;
 
 import com.baeldung.mdc.BusinessService;
 
-class Log4JBusinessService extends BusinessService {
-	
-	private static final Logger logger = LogManager.getLogger();
+public class Log4JBusinessService extends BusinessService {
 
-	@Override
-	protected void beforeTransfer(long amount) {
-		logger.info("Preparing to transfer {}$.");
-	}
+    private Logger logger = Logger.getLogger(Log4JBusinessService.class);
+
+    @Override
+    protected void beforeTransfer(long amount) {
+        logger.info("Preparing to transfer " + amount + "$.");
+    }
+
+    @Override
+    protected void afterTransfer(long amount, boolean outcome) {
+        logger.info("Has transfer of " + amount + "$ completed successfully ? " + outcome + ".");
+    }
 
-	@Override
-	protected void afterTransfer(long amount, boolean outcome) {
-		logger.info("Has transfer of {}$ completed successfully ? {}.");
-	}
-	
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JRunnable.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JRunnable.java
index 2aeb75f95a..ce5d97eddf 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JRunnable.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j/Log4JRunnable.java
@@ -1,25 +1,29 @@
 package com.baeldung.mdc.log4j;
 
 import org.apache.log4j.MDC;
+import org.apache.logging.log4j.ThreadContext;
 
 import com.baeldung.mdc.Transaction;
+import com.baeldung.mdc.log4j2.Log4J2BusinessService;
 
 public class Log4JRunnable implements Runnable {
-	private final Transaction tx;
 
-	public Log4JRunnable(Transaction tx) {
-		this.tx = tx;
-	}
+    private Transaction tx;
+    private static Log4JBusinessService log4jBusinessService = new Log4JBusinessService();
 
-	public void run() {
+    public Log4JRunnable(Transaction tx) {
+        this.tx = tx;
+    }
 
-		MDC.put("transaction.id", tx.getTransactionId());
-		MDC.put("transaction.owner", tx.getOwner());
-		MDC.put("transaction.createdAt", tx.getCreatedAt());
+    public void run() {
 
-		new Log4JBusinessService().transfer(tx.getAmount());
+        MDC.put("transaction.id", tx.getTransactionId());
+        MDC.put("transaction.owner", tx.getOwner());
+        MDC.put("transaction.createdAt", tx.getCreatedAt());
 
-		MDC.clear();
+        log4jBusinessService.transfer(tx.getAmount());
 
-	}
+        MDC.clear();
+
+    }
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2BusinessService.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2BusinessService.java
index 1000b7edc2..cbfbc5b8a5 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2BusinessService.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2BusinessService.java
@@ -1,21 +1,22 @@
 package com.baeldung.mdc.log4j2;
 
-import org.apache.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import com.baeldung.mdc.BusinessService;
 
-final class Log4J2BusinessService extends BusinessService {
-	
-	private Logger logger = Logger.getLogger(Log4J2BusinessService.class);
+public class Log4J2BusinessService extends BusinessService {
 
-	@Override
-	protected void beforeTransfer(long amount) {
-		logger .info("Preparing to transfer " + amount + "$.");
-	}
+    private static final Logger logger = LogManager.getLogger();
+
+    @Override
+    protected void beforeTransfer(long amount) {
+        logger.info("Preparing to transfer {}$.", amount);
+    }
+
+    @Override
+    protected void afterTransfer(long amount, boolean outcome) {
+        logger.info("Has transfer of {}$ completed successfully ? {}.", amount, outcome);
+    }
 
-	@Override
-	protected void afterTransfer(long amount, boolean outcome) {
-		logger.info("Has transfer of " + amount + "$ completed successfully ? " + outcome + ".");
-	}
-	
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2Runnable.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2Runnable.java
index 32f2161af8..6a3f39ba5b 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2Runnable.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/log4j2/Log4J2Runnable.java
@@ -4,22 +4,24 @@ import org.apache.logging.log4j.ThreadContext;
 
 import com.baeldung.mdc.Transaction;
 
-final class Log4J2Runnable implements Runnable {
-	private final Transaction tx;
+public class Log4J2Runnable implements Runnable {
+    private final Transaction tx;
+    private Log4J2BusinessService log4j2BusinessService = new Log4J2BusinessService();
 
-	Log4J2Runnable(Transaction tx) {
-		this.tx = tx;
-	}
+    public Log4J2Runnable(Transaction tx) {
+        this.tx = tx;
+    }
 
-	public void run() {
-							
-		ThreadContext.put("transaction.id", tx.getTransactionId());
-		ThreadContext.put("transaction.owner", tx.getOwner());
-		ThreadContext.put("transaction.createdAt", tx.getCreatedAt().toString());		
-		
-		new Log4J2BusinessService().transfer(tx.getAmount());
-		
-		ThreadContext.clearAll();
-							
-	}
+    public void run() {
+
+        ThreadContext.put("transaction.id", tx.getTransactionId());
+        ThreadContext.put("transaction.id", tx.getTransactionId());
+        ThreadContext.put("transaction.owner", tx.getOwner());
+        ThreadContext.put("transaction.createdAt", tx.getCreatedAt().toString());
+
+        log4j2BusinessService.transfer(tx.getAmount());
+
+        ThreadContext.clearAll();
+
+    }
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jBusinessService.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jBusinessService.java
index b241ec4b77..d525965ed5 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jBusinessService.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jBusinessService.java
@@ -6,17 +6,17 @@ import org.slf4j.LoggerFactory;
 import com.baeldung.mdc.BusinessService;
 
 final class Slf4jBusinessService extends BusinessService {
-	
-	private static final Logger logger = LoggerFactory.getLogger(Slf4jBusinessService.class);
 
-	@Override
-	protected void beforeTransfer(long amount) {
-		logger.info("Preparing to transfer " + amount + "$.");
-	}
+    private static final Logger logger = LoggerFactory.getLogger(Slf4jBusinessService.class);
+
+    @Override
+    protected void beforeTransfer(long amount) {
+        logger.info("Preparing to transfer {}$.", amount);
+    }
+
+    @Override
+    protected void afterTransfer(long amount, boolean outcome) {
+        logger.info("Has transfer of {}$ completed successfully ? {}.", amount, outcome);
+    }
 
-	@Override
-	protected void afterTransfer(long amount, boolean outcome) {
-		logger.info("Has transfer of " + amount + "$ completed successfully ? " + outcome + ".");
-	}
-	
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jRunnable.java b/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jRunnable.java
index 938b18c257..2ef170721c 100644
--- a/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jRunnable.java
+++ b/log-mdc-ndc/src/main/java/com/baeldung/mdc/slf4j/Slf4jRunnable.java
@@ -4,22 +4,22 @@ import org.slf4j.MDC;
 
 import com.baeldung.mdc.Transaction;
 
-final class Slf4jRunnable implements Runnable {
-	private final Transaction tx;
+public class Slf4jRunnable implements Runnable {
+    private final Transaction tx;
 
-	Slf4jRunnable(Transaction tx) {
-		this.tx = tx;
-	}
+    public Slf4jRunnable(Transaction tx) {
+        this.tx = tx;
+    }
 
-	public void run() {
-							
-		MDC.put("transaction.id", tx.getTransactionId());
-		MDC.put("transaction.owner", tx.getOwner());
-		MDC.put("transaction.createdAt", tx.getCreatedAt().toString());		
-		
-		new Slf4jBusinessService().transfer(tx.getAmount());
-		
-		MDC.clear();
-							
-	}
+    public void run() {
+
+        MDC.put("transaction.id", tx.getTransactionId());
+        MDC.put("transaction.owner", tx.getOwner());
+        MDC.put("transaction.createdAt", tx.getCreatedAt().toString());
+
+        new Slf4jBusinessService().transfer(tx.getAmount());
+
+        MDC.clear();
+
+    }
 }
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/resources/log4j.properties b/log-mdc-ndc/src/main/resources/log4j.properties
index 03ae9a0c02..39be027f3f 100644
--- a/log-mdc-ndc/src/main/resources/log4j.properties
+++ b/log-mdc-ndc/src/main/resources/log4j.properties
@@ -1,14 +1,8 @@
 log4j.appender.consoleAppender=org.apache.log4j.ConsoleAppender
 log4j.appender.consoleAppender.layout=org.apache.log4j.PatternLayout
 
-log4j.appender.file=org.apache.log4j.FileAppender
-log4j.appender.file.File=/tmp/baeldung.log
-log4j.appender.file.layout=org.apache.log4j.PatternLayout
-
 #note the %X{userName} - this is how you fetch data from Mapped Diagnostic Context (MDC)
-#log4j.appender.consoleAppender.layout.ConversionPattern=%-4r [%t] %5p %c %x - %m - owner=%X{transaction.owner} creation=%X{transaction.createdAt}%n
-#log4j.appender.file.layout.ConversionPattern=%-4r [%t] %5p %c %x - %m - owner=%X{transaction.owner} creation=%X{transaction.createdAt}%n
-log4j.appender.consoleAppender.layout.ConversionPattern=%-4r [%t] %5p %c %x - %m%n
-log4j.appender.file.layout.ConversionPattern=%-4r [%t] %5p %c %x - %m%n
+#log4j.appender.consoleAppender.layout.ConversionPattern=%-4r [%t] %5p %c{1} %x - %m%n
+log4j.appender.consoleAppender.layout.ConversionPattern=%-4r [%t] %5p %c{1} %x - %m - tx.id=%X{transaction.id} tx.owner=%X{transaction.owner}%n 
 
-log4j.rootLogger = TRACE, consoleAppender, file
\ No newline at end of file
+log4j.rootLogger = TRACE, consoleAppender
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/resources/log4j2.xml b/log-mdc-ndc/src/main/resources/log4j2.xml
index f9a2bdcf1a..800cfacafe 100644
--- a/log-mdc-ndc/src/main/resources/log4j2.xml
+++ b/log-mdc-ndc/src/main/resources/log4j2.xml
@@ -1,32 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Configuration status="INFO">
-    <Appenders>
-        # Console appender
-        <Console name="stdout" target="SYSTEM_OUT">
-            # Pattern of log message for console appender
-            <PatternLayout pattern="Log4j2 - %d{yyyy-MM-dd HH:mm:ss} %p %m owner=%X{transaction.owner} creation=%X{transaction.createdAt}%n"/>
-        </Console>
+	<Appenders>
+		<Console name="stdout" target="SYSTEM_OUT">
+			<PatternLayout
+				pattern="%-4r [%t] %5p %c{1} - %m - tx.id=%X{transaction.id} tx.owner=%X{transaction.owner}%n" />
+		</Console>
+	</Appenders>
 
-        # File appender
-        <!--  
-        
-        <File name="fout" fileName="log4j/target/baeldung-log4j2.log" immediateFlush="false" append="false">
-            # Pattern of log message for file appender
-            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %p %m%n"/>
-        </File>
-        -->
-    </Appenders>
+	<Loggers>
+		<Logger name="com.baeldung.log4j2" level="TRACE" />
 
-    <Loggers>
-        # Override log level for specified package
-        <Logger name="com.baeldung.log4j2" level="TRACE"/>
-
-        <AsyncRoot level="DEBUG">
-            <AppenderRef ref="stdout"/>
-            <!--  
-            
-            <AppenderRef ref="fout"/>
-            -->
-        </AsyncRoot>
-    </Loggers>
+		<AsyncRoot level="DEBUG">
+			<AppenderRef ref="stdout" />
+		</AsyncRoot>
+	</Loggers>
 </Configuration>
\ No newline at end of file
diff --git a/log-mdc-ndc/src/main/resources/logback.xml b/log-mdc-ndc/src/main/resources/logback.xml
index 7bea9976e7..44d247c87e 100644
--- a/log-mdc-ndc/src/main/resources/logback.xml
+++ b/log-mdc-ndc/src/main/resources/logback.xml
@@ -1,9 +1,8 @@
 <configuration>
 
-	# Console appender
 	<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
 		<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
-			<pattern>logback %d{yyyy-MM-dd HH:mm:ss} %p %m %X{transaction.owner} %X{transaction.createdAt} %n</pattern>
+			<pattern>%-4r [%t] %5p %c{1} - %m - tx.id=%X{transaction.id} tx.owner=%X{transaction.owner}%n</pattern>
 		</encoder>
 	</appender>