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JHipster / OpenAPI-无法定义包含对象数组的架构类型

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我正在使用JHipster和OpenAPI生成Spring Boot项目。使用JHipster生成项目后，我将OpenAPI文件复制到src/main/resources/swagger/api.yml中，并使用mvnw generate-sources运行OpenAPI子生成器。它失败，并带有大量异常（请参见下文）。

版本信息：

  • JHipster 6.4.1
  • OpenAPI 3（3.0.1）

注意：还有很多与此相关的其他SO问题（How to define an array of another schema in OpenAPI 3?和Return an array of object in Swaggerhub），并且我的文件的结构也相同。这对我来说很有意义……但这是行不通的。

所以，这就是我所拥有的（文件底部的模式定义）：

# API-first development with OpenAPI
# This file will be used at compile time to generate Spring-MVC endpoint stubs using openapi-generator
openapi: '3.0.1'

info:
  title: 'testEchomicroservice'
  version: 0.0.1

servers:
  - url: http://localhost:9100
    description: Development server
  - url: https://localhost:9100
    description: Development server with TLS Profile

paths:
  /random:
    get:
      deprecated: true
      summary: Returns a random message
      description: Returns a random message
      responses:
        '200':
          description: Random response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Echo'
  /echo:
    post:
      summary: Echoes a specified message
      description: Echoes a specified message
      requestBody:
        description: Echo request
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Echo'
      responses:
        '200':
          description: Echo response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Echo'
  /history:
    get:
      summary: Get echo history
      description: Get echo history
      responses:
        '200':
          description:
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EchoList'

components:
  securitySchemes:
    jwt:
      type: http
      description: JWT Authentication
      scheme: bearer
      bearerFormat: JWT
  schemas:
    Echo:
      type: object
      properties:
        message:
          type: string
    EchoList:
      type: array
      items:
        $ref: '#/components/schemas/Echo'

security:
  - jwt: []

因此，EchoList只是Echo个对象的数组。

当我尝试运行jhipster openapi子生成器时，它引发以下错误（注意：由于它超出了SO限制，因此未包含相当多的堆栈跟踪。经过快速检查，它重复了下面看到的异常）：

> mvnw generate-sources
...
[WARNING] Rule 0: org.apache.maven.plugins.enforcer.DependencyConvergence failed with message:
Failed while enforcing releasability. See above detailed error message.
[INFO]
[INFO] --- jacoco-maven-plugin:0.8.4:prepare-agent (pre-unit-tests) @ echo-service ---
[INFO] argLine set to -javaagent:C:\\Users\\JO24447\\.m2\\repository\\org\\jacoco\\org.jacoco.agent\\0.8.4\\org.jacoco.agent-0.8.4-runtime.jar=destfile=C:\\Users\\JO24447\\workspace\\OpenAPI\\entity-test\\target\\jacoco\\test\\test.exec -Djava.security.egd=file:/dev/./urandom -Xmx256m
[INFO]
[INFO] --- properties-maven-plugin:1.0.0:read-project-properties (default) @ echo-service ---
[INFO]
[INFO] --- openapi-generator-maven-plugin:4.1.3:generate (default) @ echo-service ---
[WARNING] Exception while reading:
com.fasterxml.jackson.dataformat.yaml.snakeyaml.error.MarkedYAMLException: mapping values are not allowed here
 in 'reader',line 73,column 18:
          items: $ref: '#/components/schemas/Echo'
                     ^

 at [Source: (StringReader); line: 73,column: 18]
    at com.fasterxml.jackson.dataformat.yaml.snakeyaml.error.MarkedYAMLException.from (MarkedYAMLException.java:27)
    at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken (YAMLParser.java:359)
    at com.fasterxml.jackson.core.JsonParser.nextFieldName (JsonParser.java:825)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:247)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize (JsonNodeDeserializer.java:68)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize (JsonNodeDeserializer.java:15)
    at com.fasterxml.jackson.databind.ObjectMapper._readTreeAndClose (ObjectMapper.java:4056)
    at com.fasterxml.jackson.databind.ObjectMapper.readTree (ObjectMapper.java:2551)
    at io.swagger.v3.parser.OpenAPIV3Parser.readWithInfo (OpenAPIV3Parser.java:154)
    at io.swagger.v3.parser.OpenAPIV3Parser.readLocation (OpenAPIV3Parser.java:58)
    at io.swagger.parser.OpenAPIParser.readLocation (OpenAPIParser.java:16)
    at org.openapitools.codegen.config.Codegenconfigurator.toContext (Codegenconfigurator.java:410)
    at org.openapitools.codegen.config.Codegenconfigurator.toClientOptInput (Codegenconfigurator.java:458)
    at org.openapitools.codegen.plugin.CodeGenmojo.execute (CodeGenmojo.java:705)
    at org.apache.maven.plugin.DefaultBuildPluginmanager.executeMojo (DefaultBuildPluginmanager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:39)
    at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:122)
    at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:61)
Caused by: org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here
 in 'reader',column 18:
          items: $ref: '#/components/schemas/Echo'
                     ^

    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue (ScannerImpl.java:870)
    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens (ScannerImpl.java:358)
    at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken (ScannerImpl.java:227)
    at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce (ParserImpl.java:558)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent (ParserImpl.java:158)
    at org.yaml.snakeyaml.parser.ParserImpl.getEvent (ParserImpl.java:168)
    at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken (YAMLParser.java:355)
    at com.fasterxml.jackson.core.JsonParser.nextFieldName (JsonParser.java:825)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:247)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject (JsonNodeDeserializer.java:255)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize (JsonNodeDeserializer.java:68)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize (JsonNodeDeserializer.java:15)
    at com.fasterxml.jackson.databind.ObjectMapper._readTreeAndClose (ObjectMapper.java:4056)
    at com.fasterxml.jackson.databind.ObjectMapper.readTree (ObjectMapper.java:2551)
    at io.swagger.v3.parser.OpenAPIV3Parser.readWithInfo (OpenAPIV3Parser.java:154)
    at io.swagger.v3.parser.OpenAPIV3Parser.readLocation (OpenAPIV3Parser.java:58)
    at io.swagger.parser.OpenAPIParser.readLocation (OpenAPIParser.java:16)
    at org.openapitools.codegen.config.Codegenconfigurator.toContext (Codegenconfigurator.java:410)
    at org.openapitools.codegen.config.Codegenconfigurator.toClientOptInput (Codegenconfigurator.java:458)
    at org.openapitools.codegen.plugin.CodeGenmojo.execute (CodeGenmojo.java:705)
    at org.apache.maven.plugin.DefaultBuildPluginmanager.executeMojo (DefaultBuildPluginmanager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:39)
    at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:122)
    at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:61)
[WARNING] Error snake-parsing yaml content
io.swagger.parser.util.DeserializationUtils$snakeException: Exception safe-checking yaml content  (maxDepth 2000)
    at io.swagger.parser.util.DeserializationUtils$CustomsnakeYamlConstructor.getSingleData (DeserializationUtils.java:300)
    at org.yaml.snakeyaml.Yaml.loadFromReader (Yaml.java:524)
    at org.yaml.snakeyaml.Yaml.load (Yaml.java:437)
    at io.swagger.parser.util.DeserializationUtils.readYamlTree (DeserializationUtils.java:137)
    at io.swagger.parser.Swagger20Parser.deserializeYaml (Swagger20Parser.java:83)
    at io.swagger.parser.Swagger20Parser.readWithInfo (Swagger20Parser.java:64)
    at io.swagger.parser.SwaggerParser.readWithInfo (SwaggerParser.java:32)
    at io.swagger.v3.parser.converter.SwaggerConverter.readLocation (SwaggerConverter.java:96)
    at io.swagger.parser.OpenAPIParser.readLocation (OpenAPIParser.java:16)
    at org.openapitools.codegen.config.Codegenconfigurator.toContext (Codegenconfigurator.java:410)
    at org.openapitools.codegen.config.Codegenconfigurator.toClientOptInput (Codegenconfigurator.java:458)
    at org.openapitools.codegen.plugin.CodeGenmojo.execute (CodeGenmojo.java:705)
    at org.apache.maven.plugin.DefaultBuildPluginmanager.executeMojo (DefaultBuildPluginmanager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
    at sun.reflect.NativeMethodaccessorImpl.invoke0 (Native Method)
    at sun.reflect.NativeMethodaccessorImpl.invoke (NativeMethodaccessorImpl.java:62)
    at sun.reflect.DelegatingMethodaccessorImpl.invoke (DelegatingMethodaccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:498)
    at org.apache.maven.wrapper.BootstrapMainStarter.start (BootstrapMainStarter.java:39)
    at org.apache.maven.wrapper.WrapperExecutor.execute (WrapperExecutor.java:122)
    at org.apache.maven.wrapper.MavenWrapperMain.main (MavenWrapperMain.java:61)
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  12.520 s
[INFO] Finished at: 2019-11-14T11:15:25-05:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.openapitools:openapi-generator-maven-plugin:4.1.3:generate (default) on project echo-service: Code generation failed. See above for the full exception. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors,re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions,please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
lyypf12 回答：JHipster / OpenAPI-无法定义包含对象数组的架构类型

奇怪的是我错过了。显然，我的文件结构必须如下：

components:
...
  schemas:
    Echo:
      type: object
      properties:
        message:
          type: string
    EchoList:
      type: array
      items: $ref: '#/components/schemas/Echo'

因为，将引用放在自己的行上（并缩进）后，现在一切正常。

components:
...
  schemas:
    Echo:
      type: object
      properties:
        message:
          type: string
    EchoList:
      type: array
      items:
        $ref: '#/components/schemas/Echo'

多么狡猾，微妙（且易于制造）的陷阱。

jhipsteropenapiopenapi-generator
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