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"Tools->Options->IDE Configuration->Server And External Tool Settings->HTTP Server" For example: I try to set value 'aaa' to the 'Port' field and I get an information dialog with message "Invalid value. The property Port could not be set. Reason: aaa." I suggest to change that message to "The property Port could not be set. Reason: invalid value (should be in range 1-65535)" or "The property Port could not be set. Reason: value 'aaa' is invalid". Other dialogs also can be corrected in this way. Linux RH 7.3, JDK 1.4.0_02 S1S 4 update 1 build 020905
It is generic message format used in property sheet when property setter throws IllegalArgumentException. That's why it is unlikely we can change it. Also see new Option UI proposal http://ui.netbeans.org/docs/hi/options/index.html that will change this significantly.
Verified. Messages are ok in dev build 030611.