private void validateGeneratorCanBeUsedToGenerateExceptions()

in src/main/java/feign/error/ExceptionGenerator.java [177:185]


    private void validateGeneratorCanBeUsedToGenerateExceptions(ExceptionGenerator generator) {
      try {
        generator.createException(TEST_RESPONSE);
      } catch (Exception e) {
        throw new IllegalStateException(
            "Cannot generate exception - check constructor parameter types (are headers Map<String,Collection<String>> or is something causing an exception on construction?)",
            e);
      }
    }