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How to resolve this warning

What does this error message mean? What values ​​must 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 facelets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEF
ORE_RESTORE you must also set facelets.BUILD_BEFORE_RESTORE to 'true'!
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2 answers

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

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

So, as indicated 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...

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It seems that this functionality is not very useful and can be dangerous (it broke the re-rendering of Ajax in my case).

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

<context-param>
    <param-name>facelets.RECREATE_VALUE_EXPRESSION_ON_BUILD_BEFORE_RESTORE</param-name>
    <param-value>false</param-value>
</context-param>
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Source: https://habr.com/ru/post/1768590/

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