http-spi is 1.6 compiler required for the interface when its part of the jvm being used for environment

jetty-http-spi/pom.xml

@@ -31,6 +31,14 @@
   </dependencies>
   <build>
     <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+          <verbose>false</verbose>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.felix</groupId>
         <artifactId>maven-bundle-plugin</artifactId>