diff --git a/spring-boot-parent/pom.xml b/spring-boot-parent/pom.xml
index 447426bbcc..8034a8c5db 100644
--- a/spring-boot-parent/pom.xml
+++ b/spring-boot-parent/pom.xml
@@ -294,7 +294,7 @@
 				<plugin>
 					<groupId>org.codehaus.mojo</groupId>
 					<artifactId>animal-sniffer-maven-plugin</artifactId>
-					<version>1.14</version>
+					<version>1.15</version>
 				</plugin>
 				<plugin>
 					<groupId>org.codehaus.cargo</groupId>
diff --git a/spring-boot-tools/spring-boot-loader-tools/pom.xml b/spring-boot-tools/spring-boot-loader-tools/pom.xml
index 6b8986c423..fa5721943d 100644
--- a/spring-boot-tools/spring-boot-loader-tools/pom.xml
+++ b/spring-boot-tools/spring-boot-loader-tools/pom.xml
@@ -132,8 +132,10 @@
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>animal-sniffer-maven-plugin</artifactId>
 				<configuration>
-					<!-- The use of SignalUtils seems to mess up animal sniffer -->
-					<skip>true</skip>
+					<annotations>
+						<annotation>org.springframework.boot.loader.tools.UsesUnsafeJava</annotation>
+						<annotation>org.springframework.lang.UsesJava7</annotation>
+					</annotations>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/JarWriter.java b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/JarWriter.java
index f00b7c5ee9..a0eb52b018 100644
--- a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/JarWriter.java
+++ b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/JarWriter.java
@@ -42,6 +42,8 @@ import java.util.jar.Manifest;
 import java.util.zip.CRC32;
 import java.util.zip.ZipEntry;
 
+import org.springframework.lang.UsesJava7;
+
 /**
  * Writes JAR content, ensuring valid directory entries are always create and duplicate
  * items are ignored.
@@ -86,6 +88,7 @@ public class JarWriter {
 		this.jarOutput = new JarOutputStream(fileOutputStream);
 	}
 
+	@UsesJava7
 	private void setExecutableFilePermission(File file) {
 		try {
 			Path path = file.toPath();
diff --git a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java
index ad2c0c6db2..699fe2f1de 100644
--- a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java
+++ b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SignalUtils.java
@@ -26,6 +26,7 @@ import sun.misc.SignalHandler;
  * @since 1.1.0
  */
 @SuppressWarnings("restriction")
+@UsesUnsafeJava
 public final class SignalUtils {
 
 	private static final Signal SIG_INT = new Signal("INT");
diff --git a/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/UsesUnsafeJava.java b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/UsesUnsafeJava.java
new file mode 100644
index 0000000000..102e87a5fc
--- /dev/null
+++ b/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/UsesUnsafeJava.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.loader.tools;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates that the annotated element uses unsafe Java calls.
+ *
+ * @author Phillip Webb
+ */
+@Retention(RetentionPolicy.CLASS)
+@Target({ ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE })
+@Documented
+@interface UsesUnsafeJava {
+}