[FIXED JENKINS-10490] fixed a build problem with JDK7

pom.xml

@@ -306,7 +306,7 @@ THE SOFTWARE.
           -->
           <groupId>org.kohsuke.stapler</groupId>
           <artifactId>maven-stapler-plugin</artifactId>
-          <version>1.15</version>
+          <version>1.16</version>
           <extensions>true</extensions>
           <dependencies>
             <dependency>

test/pom.xml

@@ -33,7 +33,6 @@ THE SOFTWARE.
   </parent>
   <groupId>org.jenkins-ci.main</groupId>
   <artifactId>jenkins-test-harness</artifactId>
-  <packaging>stapler-jar</packaging>
 
   <name>Test harness for Jenkins and plugins</name>
   <description>