Diagnostic messages does't show any valid values when an invalid value is given for a variable in server.env

[JoshwinThomasIBM]

When an invalid value is given for a property the following diagnostic message is shown

Here it does't mention any valid values

however on hover over the property it displays the valid values as below

it will be more helpful to show the valid values along with the diagnostic message if an invalid input is given by the user , he might not be aware about the hover message over the property.

Alternatively if quick fixes are available along with the diagnostic messages then it can also be a possible workaround

[JoshwinThomasIBM]

This behaviour is uniform across all the 3 IDE's

[cherylking]

If we address this, I would recommend providing a quick fix with each valid value for those variables that have predefined values.