Экранирование IOException при создании Shell

build.gradle

@@ -1,5 +1,5 @@
 group = 'ru.dmitriymx'
-version = '2.0-SNAPSHOT'
+version = '2.1-SNAPSHOT'
 
 apply plugin: 'java'
 apply plugin: 'idea'

src/main/java/ru/dmitriymx/shell/Shell.java

@@ -30,14 +30,20 @@ public class Shell extends Thread implements Completer {
     private Map<String, Command> commandMap = new HashMap<>();
     private StringsCompleter stringsCompleter = new StringsCompleter();
 
-    public Shell() throws IOException {
+    public Shell() {
+        try {
             console = new ConsoleReader(System.in, System.err);
             console.addCompleter(this);
             out = new PrintWriter(console.getOutput());
+        } catch (IOException e) {
+            e.printStackTrace(System.err);
+        }
     }
 
     @Override
     public synchronized void start() {
+        if (out == null) return;
+
         try {
             this.join();
         } catch (InterruptedException e) {
@@ -54,6 +60,8 @@ public class Shell extends Thread implements Completer {
     }
 
     public synchronized void shutdown() {
+        if (out == null) return;
+
         out.print(ConsoleReader.RESET_LINE);
         out.flush();
 
@@ -110,6 +118,8 @@ public class Shell extends Thread implements Completer {
     }
 
     public void registerCommand(Command command) {
+        if (out == null) return;
+
         if (command.getShell() == null) {
             command.setShell(this);
         }