Moving to SLF4J

build.gradle

@@ -139,6 +139,10 @@ subprojects {
 
     dependencies {
         compile 'junit:junit:4.12'
+        compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.+'
+        compile group: 'ch.qos.logback', name: 'logback-classic', version: '1.+'
+        // You can also use the JDK's built-in logging as the back end:
+        // compile group: 'org.slf4j', name: 'slf4j-jdk14', version: '1.7.5'
     }
 
     sourceSets {

verifying/InfoLogging.java

@@ -1,19 +0,0 @@
-// verifying/InfoLogging.java
-// (c)2016 MindView LLC: see Copyright.txt
-// We make no guarantees that this code is fit for any purpose.
-// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
-// {ErrorOutputExpected}
-import org.apache.logging.log4j.*;
-
-public class InfoLogging {
-  private static final Logger logger =
-    LogManager.getLogger(InfoLogging.class);
-  public static void main(String[] args) {
-    logger.info("Logging: INFO-level message");
-  }
-}
-/* Output:
-___[ Error Output ]___
-Jul 27, 2016 10:50:39 AM InfoLogging main
-INFO: Logging: INFO-level message
-*/

verifying/SLF4JLogging.java

@@ -0,0 +1,16 @@
+// verifying/SLF4JLogging.java
+// (c)2016 MindView LLC: see Copyright.txt
+// We make no guarantees that this code is fit for any purpose.
+// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
+import org.slf4j.*;
+
+public class SLF4JLogging {
+  private static final Logger logger =
+    LoggerFactory.getLogger(SLF4JLogging.class);
+  public static void main(String[] args) {
+    logger.info("hello logging");
+  }
+}
+/* Output:
+17:58:42.798 [main] INFO SLF4JLogging - hello logging
+*/

verifying/SimpleJUnit.java

@@ -7,8 +7,8 @@ import java.util.*;
 import org.junit.*;
 import static org.junit.Assert.*;
 
-// So we can see the list objects being created,
-// and keep track of when they are cleaned up:
+// Keeps track of list objects as they are
+// created and cleaned up:
 class CountedList extends ArrayList<String> {
   private static int counter = 0;
   private int id = counter++;

verifying/log4j2.xml

@@ -1,14 +0,0 @@
-// verifying/log4j2.xml
-<?xml version="1.0" encoding="UTF-8"?>
-<Configuration status="WARN">
-  <Appenders>
-    <Console name="Console" target="SYSTEM_OUT">
-      <PatternLayout pattern="%d{YYYY-MM-dd HH:mm:ss} [%t] %-5p %c{1}:%L - %msg%n" />
-    </Console>
-  </Appenders>
-  <Loggers>
-    <Root level="info">
-      <AppenderRef ref="Console" />
-    </Root>
-  </Loggers>
-</Configuration>