in src/main/java/org/apache/sling/commons/crypto/webconsole/internal/EncryptWebConsolePlugin.java [135:138]
private void handleParameterMissing(final HttpServletResponse response, final String parameter) throws IOException {
final String message = String.format("Parameter %s is missing", parameter);
response.sendError(HttpServletResponse.SC_BAD_REQUEST, message);
}