The problem is that you load the JSON then turn it into a schema. And your schema does not have an absolute URI in "id". So, it cannot work.

您希望使用绝对URI来加载它们。由于您最初使用的是文件（注意，使用Java 7+，您确实希望使用java.nio.file），您可以使用以下方法获取绝对URI： / p>

You want to use an absolute URI to load them. Since you originally use a File (note, with Java 7+ you really want to use java.nio.file instead), you can obtain an absolute URI to it with:

final File jsonSchemaFile = new File("main.json");
final URI uri = jsonSchemaFile.toURI();

然后加载架构：

final JsonSchema schema = factory.getJsonSchema(uri.toString());