What to do when Cannot apply expression operators to method binding

--Environment - CentOS Linux release 7.8.2003 (Core) - Eclipse IDE for Enterprise Java Developers Version: 2020-03 (4.15.0) - openjdk version 11.0.7

Event: JSF's "! (Negation)" is angry for some reason

hoge.xhtml


<h:commandButton styleClass="btn hidden_btn"
  value="#{controller.labelBean.selectBtnLabel}"
  rendered ="#{!controller.isDispSelectBtn(index)}"> <!--This is the error target-->

Error message


Cannot apply expression operators to method binding

Cause: Isn't it written properly?

There are many English sites and I don't know the cause. I want someone to explain ...

Action 1: Hide the message

This is a problem with an existing project, so this time

  1. Open the dialog with [Window]> [Preferences]
  2. [Web] > [JavaServer Faces Tool] > [Validation]
  3. Select "Ignore" in "Applying method operator to binding" in "General Problems"
  4. Close the dialog with the Apply and Colose button

Correspondence 2: Change the writing style

Change the writing style a little by referring to the following site.

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