fix for GRAILS-5595 "Bug in sun.net.www.protocol.file.FileURLConnection#getLasModified() causes obscure build failure"

Author: graemerocher

src/java/org/codehaus/groovy/grails/plugins/DefaultGrailsPlugin.java

@@ -511,6 +511,7 @@ private void initializeModifiedTimes() throws IOException {
             URLConnection c = r.getURL().openConnection();
             c.setDoInput(false);
             c.setDoOutput(false);
+            c.connect();
             modifiedTimes[i] = c.getLastModified();
         }
     }

src/java/org/codehaus/groovy/grails/web/pages/GroovyPagesTemplateEngine.java

@@ -492,6 +492,7 @@ private long establishLastModified(Resource resource) {
 
             urlc.setDoInput(false);
             urlc.setDoOutput(false);
+            urlc.connect();
 
             lastModified = urlc.getLastModified();
         } catch (FileNotFoundException fnfe) {