public class Test {
    /**
     * I want array be ignored, only taking into account keys
     */
    private static String JSON = "{\"property\":{\"key1\": {}, \"key2\": {}, \"array\":[1, 2]}}";

    @JsonIgnoreProperties(ignoreUnknown = true)
    private static class MyBean {
        private Map<String, Map<String, String>> property;


        public Map<String, Map<String, String>> getProperty() {
            return property;
        }

        public void setProperty(Map<String, Map<String, String>> property) {
            this.property = property;
        }
    }

    public static void main(String[] args) throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        objectMapper.readValue(JSON, MyBean.class);
    }
}