Inspectopedia
 
2025.2
  1. All Inspections
  2. Java
  3. Properties files
  4. Unsupported character
UAST

Unsupported character

Warning
Last modified: Last modified: 18 September 2025

Reports characters in property files that are unsupported by the ISO-8859-1 charset when Java 1.8 or earlier is used. The inspection checks if a property file contains characters that cannot be mapped to ISO-8859-1 and suggests converting them to Unicode escape sequences for compatibility.

Configure the inspection:

Use the Convert to escape sequences quick-fix to ensure compatibility with ISO-8859-1 encoding:

Example:

After the quick-fix is applied:

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

UnsupportedCharacter
Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Properties files

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

note

Actual comment syntax will depend on the code language you are working with

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,