Merge branch '1.1.x'

Conflicts:
	spring-boot/src/main/java/org/springframework/boot/StartupInfoLogger.java
	spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackLoggingSystem.java

spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackLoggingSystem.java

@@ -17,6 +17,8 @@
 package org.springframework.boot.logging.logback;
 
 import java.net.URL;
+import java.security.CodeSource;
+import java.security.ProtectionDomain;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -146,10 +148,21 @@ public class LogbackLoggingSystem extends Slf4JLoggingSystem {
 						+ "implementation (%s loaded from %s). If you are using "
 						+ "Weblogic you will need to add 'org.slf4j' to "
 						+ "prefer-application-packages in WEB-INF/weblogic.xml",
-				factory.getClass(), factory.getClass().getProtectionDomain()
-						.getCodeSource().getLocation()));
-
+				factory.getClass(), getLocation(factory)));
 		return (LoggerContext) factory;
 	}
 
+	private Object getLocation(ILoggerFactory factory) {
+		try {
+			ProtectionDomain protectionDomain = factory.getClass().getProtectionDomain();
+			CodeSource codeSource = protectionDomain.getCodeSource();
+			if (codeSource != null) {
+				return codeSource.getLocation();
+			}
+		}
+		catch (SecurityException ex) {
+			// Unable to determine location
+		}
+		return "unknown location";
+	}
 }