Disable default configuration detection in @SpringApplicationConfiguration

This is a holding pattern until SPR-11455 is fixed. We now throw an
exception with a helpful message instead of ttrying to detect default
configuration.

Fixes gh-380

spring-boot/src/main/java/org/springframework/boot/test/SpringApplicationContextLoader.java

@@ -91,9 +91,9 @@ public class SpringApplicationContextLoader extends AbstractContextLoader {
 		sources.addAll(Arrays.asList(mergedConfig.getClasses()));
 		sources.addAll(Arrays.asList(mergedConfig.getLocations()));
 		if (sources.isEmpty()) {
-			Class<?>[] defaultConfigClasses = detectDefaultConfigurationClasses(mergedConfig
-					.getTestClass());
-			sources.addAll(Arrays.asList(defaultConfigClasses));
+			throw new IllegalStateException(
+					"No configuration resources found (use classes= or locations= in @SpringApplicationConfiguration). "
+							+ "Default configuration detection is not supported with this loader (see SPR-11455 for details)");
 		}
 		return sources;
 	}

spring-boot/src/test/java/org/springframework/boot/test/SpringApplicationConfigurationDefaultConfigurationTests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.test;
 
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -32,6 +33,7 @@ import static org.junit.Assert.assertNotNull;
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration
+@Ignore("Ignore until gh-380, SPR-11455 can be resolved")
 public class SpringApplicationConfigurationDefaultConfigurationTests {
 
 	@Autowired