[JENKINS-28120]

As the first step of Java7 migration, ship Java7 class files without
requiring Java7 runtime.

changelog.html

@@ -55,6 +55,10 @@
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=rfe>
+    As <a hreef="http://jenkins-ci.org/content/good-bye-java6">promised</a>, shipping
+    with Java7 class files.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-28120">issue 28120</a>)
   <li class=bug>
     Under rare conditions Executor.getProgress() can throw a Division by zero exception.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-28115">issue 28115</a>)

core/src/main/resources/hudson/slaves/SlaveComputer/slave-agent.jnlp.jelly

@@ -50,10 +50,10 @@ THE SOFTWARE.
         <j:set var="port" value="${request.getParameter('debugPort')}"/>
         <j:choose>
           <j:when test="${port!=null}">
-            <j2se version="1.5+" java-vm-args="${it.launcher.vmargs} -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=${port}" />
+            <j2se version="1.7+" java-vm-args="${it.launcher.vmargs} -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=${port}" />
           </j:when>
           <j:otherwise>
-            <j2se version="1.5+" java-vm-args="${it.launcher.vmargs}"/>
+            <j2se version="1.7+" java-vm-args="${it.launcher.vmargs}"/>
           </j:otherwise>
         </j:choose>
         <jar href="${rootURL}jnlpJars/remoting.jar"/>

pom.xml

@@ -101,7 +101,7 @@ THE SOFTWARE.
     <matrix-project.version>1.4.1</matrix-project.version>
     <animal.sniffer.skip>${skipTests}</animal.sniffer.skip>
 
-    <java.level>6</java.level>
+    <java.level>7</java.level>
   </properties>
 
   <repositories>
@@ -604,7 +604,7 @@ THE SOFTWARE.
         <configuration>
           <signature>
             <groupId>org.codehaus.mojo.signature</groupId>
-            <artifactId>java1${java.level}</artifactId>
+            <artifactId>java16</artifactId>
             <version>1.0</version>
           </signature>
         </configuration>