Description of problem:

Dashboard is not displayed and Globally Uncaught Exception is thrown in RHQ UI:

***************************************
java.lang.IllegalArgumentException:Invalid column widths (more widths than columns) [58%, *]
--- STACK TRACE FOLLOWS ---
Invalid column widths (more widths than columns) [58%, *]
   at Unknown.Throwable_1(Unknown Source)
   at Unknown.Exception_1(Unknown Source)
   at Unknown.RuntimeException_1(Unknown Source)
   at Unknown.IllegalArgumentException_1(Unknown Source)
   at Unknown.PortalLayout_0(Unknown Source)
   at Unknown.$buildPortlets(Unknown Source)
   at Unknown.onInit_39(Unknown Source)
   at Unknown.doInit(Unknown Source)
   at Unknown.create_13(Unknown Source)
   at Unknown.$getOrCreateJsObj_0(Unknown Source)

***************************************

Version-Release number of selected component (if applicable):
RHQ 4.12

How reproducible:
Sometimes 

Steps to Reproduce:
I didn't manage to reproduce the error. But, our user created a new dashboard and dragged the internal dashboard window (portlet) when this error happened.

Actual results:
Globally Uncaught Exception is thrown and Dashboard page is not displayed at all (not even Default Dashboard).


Expected results:
No error is thrown and dashboard is properly displayed.


Additional info:

This was reported for "rhqadmin" user (it's ID in rhq_principal is 2). So, the following SQL has been executed:

SELECT dash.id as DASH_ID, dash.name, prop.id as PROP_ID, prop.name, prop.string_value, port.id as PORT_ID, port.name, port.portlet_key, port.col, port.col_index FROM rhq_dashboard dash
LEFT JOIN rhq_config_property prop ON prop.configuration_id = dash.configuration_id
LEFT JOIN rhq_dashboard_portlet port ON port.dashboard_id = dash.id
WHERE dash.subject_id = 2 AND dash.resource_id IS NULL AND (prop.name = 'widths' OR prop.name = 'columns');

and this resulted in:

*********************
DASH_ID  NAME        PROP_ID  NAME    STRING_VALUE    PORT_ID  NAME    PORTLET_KEY COL COL_INDEX
10001       Default        24151   widths  31%,*   10001   Recent Operations   Operations  1   2
10001       Default       24144   widths  31%,*   10001   Recent Operations   Operations  1   2
10001       Default       13408   columns 2   10001   Recent Operations   Operations  1   2
10001       Default       24151   widths  31%,*   10002   Alerted or Unavailable Resources    ProblemResources    1   1
10001       Default       24144   widths  31%,*   10002   Alerted or Unavailable Resources    ProblemResources    1   1
10001       Default       13408   columns 2   10002   Alerted or Unavailable Resources    ProblemResources    1   1
10001       Default       24151   widths  31%,*   10003   Recent Alerts   RecentAlerts    1   0
10001       Default       24144   widths  31%,*   10003   Recent Alerts   RecentAlerts    1   0
10001       Default       13408   columns 2   10003   Recent Alerts   RecentAlerts    1   0
10001       Default       24151   widths  31%,*   10004   Mashup  Mashup  0   1
10001       Default       24144   widths  31%,*   10004   Mashup  Mashup  0   1
10001       Default       13408   columns 2   10004   Mashup  Mashup  0   1
10001       Default      24151   widths  31%,*   10005   Inventory Summary   InventorySummary    0   0
10001       Default      24144   widths  31%,*   10005   Inventory Summary   InventorySummary    0   0
10001       Default      13408   columns 2   10005   Inventory Summary   InventorySummary    0   0
10004      EAP-Web  3710054 widths  58%,*   10021   Alerted or Unavailable Resources    ProblemResources    0   0
10004      EAP-Web  3816432 widths  *   10021   Alerted or Unavailable Resources    ProblemResources    0   0
10004      EAP-Web  3816431 columns 1   10021   Alerted or Unavailable Resources    ProblemResources    0   0
10004      EAP-Web  3710054 widths  58%,*   10022   Recent Alerts   RecentAlerts    0   1
10004      EAP-Web  3816432 widths  *   10022   Recent Alerts   RecentAlerts    0   1
10004      EAP-Web  3816431 columns 1   10022   Recent Alerts   RecentAlerts    0   1
10004      EAP-Web  3710054 widths  58%,*   10023   Timeline    ResourceTimeline    0   2
10004      EAP-Web  3816432 widths  *   10023   Timeline    ResourceTimeline    0   2
10004      EAP-Web  3816431 columns 1   10023   Timeline    ResourceTimeline    0   2
*********************

So, from above result, you can see that somehow we added two "widths" rows for each portlet (both EAP-Web and Default) and the one added for EAP-Web has incorrect width string_value.