How to resolve this facelets warning message

What does this error message mean? What values should be provided to get rid of this warning?

15:10:58,024 WARNING [component] facelets.RECREATE_VALUE_EXPRESSION_ON_BUIL
D_BEFORE_RESTORE is set to 'true' but facelets.BUILD_BEFORE_RESTORE is set
to 'false' or unset. To use facel开发者_如何学运维ets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEF
ORE_RESTORE you must also set facelets.BUILD_BEFORE_RESTORE to 'true'!

In your web.xml file, it seems that you have this parameter defined:

<context-param>
    <param-name>facelets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEFORE_RESTORE</param-name>
    <param-value>true</param-value>
</context-param>

So as stated by the warning message, just add:

<context-param>
    <param-name>facelets.BUILD_BEFORE_RESTORE</param-name>
    <param-value>true</param-value>
</context-param>

Another solution is to remove the first parameter from web.xml...

It seems that this functionality is not really useful and could be dangerous (it broke the Ajax re-render in my case).

I suppress the warning by adding this in my web.xml :

<context-param>
    <param-name>facelets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEFORE_RESTORE</param-name>
    <param-value>false</param-value>
</context-param>