fixed JDK6 dependency. See, this stuff actually works.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@13260 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/node_monitors/ResponseTimeMonitor.java

@@ -5,6 +5,7 @@ import hudson.model.Computer;
 import hudson.remoting.Callable;
 import hudson.remoting.Future;
 import hudson.util.TimeUnit2;
+import hudson.util.IOException2;
 import net.sf.json.JSONObject;
 import org.kohsuke.stapler.StaplerRequest;
 
@@ -38,7 +39,7 @@ public class ResponseTimeMonitor extends NodeMonitor {
                 long end = System.nanoTime();
                 d = new Data(old,TimeUnit2.NANOSECONDS.toMillis(end-start));
             } catch (ExecutionException e) {
-                throw new IOException(e.getCause());    // I don't think this is possible
+                throw new IOException2(e.getCause());    // I don't think this is possible
             } catch (TimeoutException e) {
                 // special constant to indicate that the processing timed out.
                 d = new Data(old,-1L);