format the JSONException in a <PRE> tag

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15943 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/AbstractModelObject.java

@@ -57,6 +57,17 @@ public abstract class AbstractModelObject implements SearchableModelObject {
         rsp.forward(this,"error",req);
     }
 
+    /**
+     * @param pre
+     *      If true, the message is put in a PRE tag.
+     */
+    protected final void sendError(String message, StaplerRequest req, StaplerResponse rsp, boolean pre) throws ServletException, IOException {
+        req.setAttribute("message",message);
+        if(pre)
+            req.setAttribute("pre",true);
+        rsp.forward(this,"error",req);
+    }
+
     protected final void sendError(String message) throws ServletException, IOException {
         sendError(message,Stapler.getCurrentRequest(),Stapler.getCurrentResponse());
     }

core/src/main/java/hudson/model/Job.java

@@ -946,7 +946,7 @@ public abstract class Job<JobT extends Job<JobT, RunT>, RunT extends Run<JobT, R
             e.printStackTrace(pw);
 
             rsp.setStatus(SC_BAD_REQUEST);
-            sendError(sw.toString(), req, rsp);
+            sendError(sw.toString(), req, rsp, true);
         }
     }