Log default resources

Closes gh-62

Author: rwinch

spring-boot-testjars/src/main/java/org/springframework/experimental/boot/server/exec/CommonsExecWebServerFactoryBean.java

@@ -23,6 +23,8 @@
 import java.util.function.Consumer;
 
 import org.apache.commons.exec.CommandLine;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.BeanNameAware;
 import org.springframework.beans.factory.DisposableBean;
@@ -42,6 +44,8 @@
 public class CommonsExecWebServerFactoryBean
 		implements SmartFactoryBean<CommonsExecWebServer>, DisposableBean, BeanNameAware {
 
+	private static Log logger = LogFactory.getLog(CommonsExecWebServerFactoryBean.class);
+
 	private static final String DEFAULT_SPRING_BOOT_MAIN_CLASSNAME = "org.springframework.experimental.boot.server.exec.main.SpringBootApplicationMain";
 
 	private String executable = currentJavaExecutable();
@@ -150,11 +154,22 @@ public void setBeanName(String beanName) {
 	}
 
 	private void defaultApplicationConfiguration(String beanName, String extension) {
-		ResourceClasspathEntry defaultApplicationConfig = new ResourceClasspathEntry(
-				"testjars/" + beanName + "/application." + extension, "application." + extension);
+		String existingResourceName = "testjars/" + beanName + "/application." + extension;
+		String classpathResourceName = "application." + extension;
+		ResourceClasspathEntry defaultApplicationConfig = new ResourceClasspathEntry(existingResourceName,
+				classpathResourceName);
 		if (defaultApplicationConfig.exists()) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("Adding default resource " + existingResourceName + " as " + classpathResourceName);
+			}
 			classpath((cp) -> cp.entries(defaultApplicationConfig));
 		}
+		else {
+			if (logger.isDebugEnabled()) {
+				logger.debug("The default resource was not found " + existingResourceName
+						+ " and will not be added to the classpath as " + classpathResourceName);
+			}
+		}
 	}
 
 	@Override