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The encoding property of jsp files is read only but this means user would need to change it in their code; but assuming that properties are provided so they don't have to do that. I thought at one time this property was changable. Is there a reason that the property needs to be read only ?
No, this property was always read-only and it was designed that way. Changing it to read-write would be possible, but very complicated and challenging given the complexity of the JSP spec in this area. So I consider this to be an enhancement, not a bug. Also, we did not really see any user interest in having this property read-write, so I don't think this is high priority, changing to P3.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss