# <netui:bindingUpdateErrors> Tag

Renders the set of error messages found during the process of resolving data binding expressions ({pageFlow.firstname}, {request.firstname}, etc.).

## Syntax

<netui:bindingUpdateErrors
[alwaysReport="boolean_always_report"]
[expression="string_databinding_expression"]
[id="id"] />

## Description

Renders the set of error messages found during the process of resolving data binding expressions ({pageFlow.firstname}, {request.firstname}, etc.). By default, the error messages are only rendered when WebLogic Server is in Development mode; the messages are not displayed in Production mode. The tag is intended for development use, not for error reporting in deployed applications.

## Attributes

alwaysReport | Boolean. If `isAlwaysReport` is set to true, then the errors will be displayed in Production mode as well as in Development mode. Otherwise, the errors will be displayed only in Development mode.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
expression | String. The data binding expression to match for binding errors. If an data binding expression is specified, only binding errors for that expression will be displayed. Otherwise, all errors will be displayed.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
id |
Required | Supports runtime expression evaluation | Data bindable
No | No |

## Sample

In this first sample, because the <netui:bindingUpdateErrors/> tag is unqualified, messages will be displayed if any data binding errors occurred when a form was posted. The messages are displayed on the page and in the Server console.

    <netui:bindingUpdateErrors />

In this next sample, only binding errors for the expression `{actionForm.firstName}` will be displayed.

    <netui:bindingUpdateErrors expression="{actionForm.firstName}"/>

## Code Sample

[BEA_HOME]/weblogic81/samples/workshop/SamplesApp/WebApp/tagSamples/netui/bindingUpdateErrors/index.jsp

## Related Topics

<netui:bindingUpdateErrors> Tag Sample