resolve issue: java.lang.IllegalStateException: Shutdown in progress

samples/helloworld/src/main/resources/log4j.properties

@@ -0,0 +1 @@
+log4j.rootCategory=OFF

src/main/java/org/springframework/shell/Bootstrap.java

@@ -88,8 +88,6 @@ public class Bootstrap {
 		for (Converter converter : converters.values()) {
 			shell.getSimpleParser().add(converter);
 		}
-
-		shell.start();
 	}
 
 	private void createApplicationContext() {
@@ -186,6 +184,7 @@ public class Bootstrap {
 			}
 		}
 		else {
+			shell.start();
 			shell.promptLoop();
 			exitShellRequest = shell.getExitShellRequest();
 			if (exitShellRequest == null) {

src/main/java/org/springframework/shell/core/JLineShell.java

@@ -87,6 +87,7 @@ public abstract class JLineShell extends AbstractShell implements CommandMarker,
 	private final Map<String, FlashInfo> flashInfoMap = new HashMap<String, FlashInfo>();
 	/** key: row number, value: eraseLineFromPosition */
 	private final Map<Integer, Integer> rowErasureMap = new HashMap<Integer, Integer>();
+	private boolean shutdownHookFired = false; // ROO-1599
 
 	private int historySize;
 
@@ -129,7 +130,15 @@ public abstract class JLineShell extends AbstractShell implements CommandMarker,
 
 		setShellStatus(Status.STARTED);
 
-
+		try {
+			// Monitor CTRL+C initiated shutdowns (ROO-1599)
+			Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
+				public void run() {
+					shutdownHookFired = true;
+				}
+			}, getProductName() + " JLine Shutdown Hook"));
+		} catch (Throwable t) {
+		}
 
 		// Handle any "execute-then-quit" operation
 
@@ -290,7 +299,7 @@ public abstract class JLineShell extends AbstractShell implements CommandMarker,
 		// Setup a thread to ensure flash messages are displayed and cleared correctly
 		Thread t = new Thread(new Runnable() {
 			public void run() {
-				while (!shellStatus.getStatus().equals(Status.SHUTTING_DOWN)) {
+				while (!shellStatus.getStatus().equals(Status.SHUTTING_DOWN) && !shutdownHookFired) {
 					synchronized (flashInfoMap) {
 						long now = System.currentTimeMillis();
 
@@ -426,6 +435,9 @@ public abstract class JLineShell extends AbstractShell implements CommandMarker,
 			rowErasureMap.remove(row);
 		}
 		else {
+			if (shutdownHookFired) {
+				return; // ROO-1599
+			}
 			// They want some message displayed
 			int startFrom = reader.getTermwidth() - message.length() + 1;
 			if (startFrom < 1) {