Fixes #55: stop() connector to unbind socket

The `Tomcat.start()` has to happen to initialize the `ServletContext`
but we can immediately stop the connector and then restart it when
the context is finished refreshing. Seems to make curl fail quickly
if an app is slow to start.

spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainer.java

@@ -55,6 +55,16 @@ public class TomcatEmbeddedServletContainer implements EmbeddedServletContainer
 	private synchronized void initialize() throws EmbeddedServletContainerException {
 		try {
 			this.tomcat.start();
+			try {
+				// Allow the server to start so the ServletContext is available, but stop
+				// the connector to prevent requests from being handled before the Spring
+				// context is ready:
+				Connector connector = this.tomcat.getConnector();
+				connector.getProtocolHandler().stop();
+			}
+			catch (Exception e) {
+				this.logger.error("Cannot pause connector: ", e);
+			}
 			// Unlike Jetty, all Tomcat threads are daemon threads. We create a
 			// blocking non-daemon to stop immediate shutdown
 			Thread awaitThread = new Thread("container-" + (containerCounter++)) {
@@ -77,7 +87,7 @@ public class TomcatEmbeddedServletContainer implements EmbeddedServletContainer
 		Connector connector = this.tomcat.getConnector();
 		if (connector != null) {
 			try {
-				connector.getProtocolHandler().resume();
+				connector.getProtocolHandler().start();
 			}
 			catch (Exception e) {
 				this.logger.error("Cannot start connector: ", e);

spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactory.java

@@ -131,15 +131,6 @@ public class TomcatEmbeddedServletContainerFactory extends
 		customizeConnector(connector);
 		tomcat.getService().addConnector(connector);
 		tomcat.setConnector(connector);
-		try {
-			// Allow the server to start so the ServletContext is available, but stop the
-			// connector to prevent requests from being handled before the Spring context
-			// is ready:
-			connector.getProtocolHandler().pause();
-		}
-		catch (Exception e) {
-			this.logger.error("Cannot pause connector: ", e);
-		}
 		tomcat.getHost().setAutoDeploy(false);
 		tomcat.getEngine().setBackgroundProcessorDelay(-1);
 
@@ -203,10 +194,15 @@ public class TomcatEmbeddedServletContainerFactory extends
 	// Needs to be protected so it can be used by subclasses
 	protected void customizeConnector(Connector connector) {
 		connector.setPort(getPort());
-		if (connector.getProtocolHandler() instanceof AbstractProtocol
-				&& getAddress() != null) {
-			((AbstractProtocol) connector.getProtocolHandler()).setAddress(getAddress());
+		if (connector.getProtocolHandler() instanceof AbstractProtocol) {
+			if (getAddress() != null) {
+				((AbstractProtocol) connector.getProtocolHandler())
+						.setAddress(getAddress());
+			}
 		}
+		// If ApplicationContext is slow to start we want Tomcat not to bind to the socket
+		// prematurely...
+		connector.setProperty("bindOnInit", "false");
 	}
 
 	/**