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The following string is used for UI on properties window, org/netbeans/api/javafx/composer/model/control/Bundle.properties: ButtonModel.action.displayName=Action But it's also used in generated codes. When new action method is created, the following codes are inserted. "Action" will be localized when it's localized. function buttonAction (): Void { //TODO } When it's localized, the code will be function button<Translation of Action> (): Void { //TODO } We usually do not use multibytes in codes except string. Please separate the properties for UI and codes so that such localized strings will not be into the actual codes. It looks other strings are also inserted into the generated codes, e.g. ./org/netbeans/api/javafx/composer/model/control/experimental/Bundle.properties: MenuModel.onHiding.displayName=On Hiding PopupMenuModel.onHiding.displayName=On Hiding MenuModel.onShowing.displayName=On Showing MenuModel.onShown.displayName=On Shown It's not easy to understand which strings should be localized or not, so it's better to extract just UI strings into Bundle.properties file.
I am going to fix it ASAP. Meanwhile feel free to commit your I18N bundles.
Fixed in Composer repository as 100463976ca4 changeset. The change will be visible in next Composer continuous build.
The root cause of the issue is caused in properties.control.FieldPanel class and affects all properties. It took their display-name instead of field-name when generating code. Currently the identified in generated code is composed as: instanceNameOfTheComponent + fieldNameOfThePropertyOfTheComponent optionally it may have a suffix in the following format: "At" + selectedStateName E.g. buttonAction or buttonActionAtNewState1 Note that the selectedStateName is entered by an user and is I18N as well. Its initial value is taken from "LBL_new_state_name" key in: javafx.composer.design/org/netbeans/modules/javafx/composer/design/states/Bundle.properties file. Therefore there still may be a chance to have a multi-bytes character in the code. If this is a problem we can remove the key from bundle (i.e. un-I18N it). Or just do not localize this single key.