Add logging functionality

build.gradle

@@ -29,6 +29,10 @@ repositories {
 dependencies {
     // Use JUnit test framework
     testImplementation('org.junit.jupiter:junit-jupiter:5.4.2')
+
+    // Logging
+    compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.26'
+    compile group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
 }
 
 test {

src/main/java/de/tudresden/inf/mci/brailleplot/App.java

 package de.tudresden.inf.mci.brailleplot;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.util.concurrent.ConcurrentLinkedDeque;
 
 /**
@@ -23,11 +26,14 @@ public final class App {
     private static final int EXIT_SUCCESS = 0;
     private static final int EXIT_ERROR = 1;
 
+    private final Logger mLogger;
+
     private ConcurrentLinkedDeque<Runnable> mFinalizers;
 
     private App() {
         sInstance = this;
         mFinalizers = new ConcurrentLinkedDeque<>();
+        mLogger = LoggerFactory.getLogger(this.getClass());
     }
 
     /**
@@ -75,9 +81,9 @@ public final class App {
      */
     public static void terminateWithException(final Exception e, final String message) {
         if (!message.isEmpty()) {
-            System.err.println(message);
+            getInstance().mLogger.error(message);
         }
-        e.printStackTrace();
+        getInstance().mLogger.error("Application will now shut down due to an unrecoverable error", e);
         getInstance().runFinalizers();
         System.exit(EXIT_ERROR);
     }
@@ -89,11 +95,15 @@ public final class App {
      */
     int run(final String[] args) {
 
+        // Has to be the first finalizer to be added, so that it is run last
         registerFinalizer(() -> {
-            System.out.println("Application terminated.");
+            mLogger.info("Application terminated");
         });
 
         try {
+            // Logging example
+            mLogger.info("Application started");
+
             // Parse command line parameters