This problem occurs if you use a formatting locale `ivy.session.setFormattingLocale(...)` which use a *comma* as decimal separator (like Germany or Austria). The problem seems to be a contract violation between **Primefaces** and **JSF**: [https://github.com/primefaces/primefaces/issues/2147][1] As it looks now there is only a problem if you use `java.lang.Number` and Primefaces number components. This issue will be fixed with ivy 6.0.13 / 7.0.5 / 7.2. For other versions use the following workaround: &lt;p:inputNumber <p:inputNumber value="#{data.dataclass.myNumber}"> **&lt;f:convertNumber <f:convertNumber type="number" locale="en" />** /> &lt;/p:inputNumber></p:inputNumber> [1]: https://github.com/primefaces/primefaces/issues/2147

This problem occurs if you use a formatting locale `ivy.session.setFormattingLocale(...)` which use a *comma* as decimal separator (like Germany or Austria). The problem seems to be a contract violation between **Primefaces** and **JSF**: [https://github.com/primefaces/primefaces/issues/2147][1] As it looks now there is only a problem if you use `java.lang.Number` and Primefaces number components. This issue will be fixed with ivy 6.0.13 / 7.0.5 / 7.2. For other versions use the following workaround: &lt;p:inputNumber value="#{data.dataclass.myNumber}"> **&lt;f:convertNumber type="number" locale="en" />** &lt;/p:inputNumber> [1]: https://github.com/primefaces/primefaces/issues/2147