Prototype.js calls eval() on the response when the content type is set to...

Prototype.js calls eval() on the response when the content type is set to JavaScript, and eval() fails without the surrounding bracket.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@35344 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/util/ComboBoxModel.java

@@ -31,6 +31,7 @@ import org.kohsuke.stapler.export.Flavor;
 
 import javax.servlet.ServletException;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Collection;
 
@@ -59,6 +60,9 @@ public class ComboBoxModel extends ArrayList<String> implements HttpResponse {
 
     public void generateResponse(StaplerRequest req, StaplerResponse rsp, Object node) throws IOException, ServletException {
         rsp.setContentType(Flavor.JSON.contentType);
-        JSONArray.fromObject(this).write(rsp.getWriter());
+        PrintWriter w = rsp.getWriter();
+        w.print('(');
+        JSONArray.fromObject(this).write(w);
+        w.print(')');
     }
 }