Reading from property file containing utf 8 character

Use an InputStreamReader with Properties.load(Reader reader):

FileInputStream input = new FileInputStream(new File("uinsoaptest.properties"));
props.load(new InputStreamReader(input, Charset.forName("UTF-8")));

As a method, this may resemble the following:

  private Properties read( final Path file ) throws IOException {
    final var properties = new Properties();

    try( final var in = new InputStreamReader(
      new FileInputStream( file.toFile() ), StandardCharsets.UTF_8 ) ) {
      properties.load( in );
    }

    return properties;
  }

Don’t forget to close your streams. Java 7 introduced StandardCharsets.UTF_8.