【问题标题】：Spring Boot json schema validation with version draft 07 throws JsonSchemaException: Unknown MetaSchema: https://json-schema.org/draft-07/schemaSpring Boot json 模式验证与版本草案 07 抛出 JsonSchemaException：未知 MetaSchema：https://json-schema.org/draft-07/schema
【发布时间】：2020-10-01 08:39:18
【问题描述】：

问题

使用 json 模式验证器验证 json 会引发加载 json 模式文件的异常：



    at com.networknt.schema.JsonSchemaFactory.findMetaSchemaForSchema(JsonSchemaFactory.java:267)
    at com.networknt.schema.JsonSchemaFactory.createValidationContext(JsonSchemaFactory.java:258)
    at com.networknt.schema.JsonSchemaFactory.newJsonSchema(JsonSchemaFactory.java:252)
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:296)
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:304)
    at com.example.demojsonschemavalidation07.JsonSchemaValidator.validate(JsonSchemaValidator.java:28)
    at com.example.demojsonschemavalidation07.JsonSchemaValidatorTest.test_valid_message(JsonSchemaValidatorTest.java:19)
...

Json 架构版本草案 07：https://json-schema.org/learn/miscellaneous-examples.html
- lib 贡献者已经测试了我的输入，所以验证器 lib 按预期工作：https://github.com/networknt/json-schema-validator/commit/236967ad478802233ddf1f5e277bf0903af47e5a
Json 验证器：https://github.com/networknt/json-schema-validator
Spring Boot 项目：2.2.10

测试项目

https://github.com/nusmanov/spring-boot-json-schema-validation/

Json 架构

{
  "$id": "https://example.com/person.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Person",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string",
      "description": "The person's first name."
    },
    "lastName": {
      "type": "string",
      "description": "The person's last name."
    },
    "age": {
      "description": "Age in years which must be equal to or greater than zero.",
      "type": "integer",
      "minimum": 0
    }
  }
}

JSON 文本

{
  "firstName": "John",
  "lastName": "Doe",
  "age": 21
}

完全例外

com.networknt.schema.JsonSchemaException: Unknown MetaSchema: https://json-schema.org/draft-07/schema

    at com.networknt.schema.JsonSchemaFactory.findMetaSchemaForSchema(JsonSchemaFactory.java:267)
    at com.networknt.schema.JsonSchemaFactory.createValidationContext(JsonSchemaFactory.java:258)
    at com.networknt.schema.JsonSchemaFactory.newJsonSchema(JsonSchemaFactory.java:252)
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:296)
    at com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:304)
    at com.example.demojsonschemavalidation07.JsonSchemaValidator.validate(JsonSchemaValidator.java:28)
    at com.example.demojsonschemavalidation07.JsonSchemaValidatorTest.test_valid_message(JsonSchemaValidatorTest.java:19)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
    at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:212)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:208)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
    at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
    at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)



Process finished with exit code 255

【问题讨论】：

标签： json spring-boot jsonschema json-schema-validator

【解决方案1】：

发现错误

JsonSchemaFactory.getInstance() 使用的是默认版本 4。

修复

JsonSchemaFactory.getInstance(VersionFlag.V7).getSchema(schemaPath.getInputStream());

【讨论】：

对，您通常可以强制使用特定草稿（方言），但最好根据架构本身定义的方言自动检测。
好的！和我一样，但我必须添加 JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V201909)...

【解决方案2】：

从 https 中删除 draft-07 的 URI 中的 s。

draft-07 的 URI 是 http://...。

用于标识模式方言的 URI 不一定是网络可寻址的……换句话说，“它只是一个字符串”，应该完全匹配。

【讨论】：

看来您最好使用自动检测，支持：github.com/networknt/json-schema-validator/blob/master/doc/…
“看起来你应该最好使用自动检测，这是受支持的”100% 同意你的看法，谢谢。