code: public void validate(String json, String schemaJson) {
      Schema schema = loadSchema(schemaJson);
      validate(json, schema);
    }
docs: Validates that a JSON string conforms to a JSON schema.
  
  @param json the JSON string to check
  @param schemaJson the JSON string for the schema
  @throws InvalidJsonSchemaException if the JSON schema cannot be loaded
  @throws JsonValidationException if the JSON string doesn't conform to the schema