[Java]Missing classes when generating code

Description

I am trying to generate Java client classes. I am using the following plugin config:

            <plugin>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-codegen-maven-plugin</artifactId>
                <version>2.3.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/src/main/resources/swagger-api-v1.json</inputSpec>
                            <language>spring</language>
                            <library>spring-cloud</library>
                            <output>${project.build.directory}/generated-sources</output>
                            <apiPackage>${default.package}.handler</apiPackage>
                            <modelPackage>${default.package}.model</modelPackage>
                            <invokerPackage>${default.package}.handler</invokerPackage>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

The specfile specifies OAuth2.

   "securityDefinitions": {
    "app-developer": {
      "type": "oauth2",
      "flow": "application",
      "tokenUrl": "https://api.myApp.com/oauth/v2/token",
      "scopes": {
        "crs": "App Services"
      }
    }
  },
  "security": [
    {
      "app-developer": [
        "crs"
      ]
    }
  ],

When i run mvn package i get:

[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[11,62] package org.springframework.cloud.security.oauth2.client.feign does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[12,50] package org.springframework.security.oauth2.client does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[13,59] package org.springframework.security.oauth2.client.resource does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[14,69] package org.springframework.security.oauth2.client.token.grant.client does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[15,67] package org.springframework.security.oauth2.client.token.grant.code does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[16,71] package org.springframework.security.oauth2.client.token.grant.implicit does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[17,71] package org.springframework.security.oauth2.client.token.grant.password does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[18,61] package org.springframework.security.oauth2.common.exceptions does not exist
[ERROR] /C:/work/djingo/repos/skill-recipe-java/target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java:[19,61] package org.springframework.security.oauth2.common.exceptions does not exist

I suppose I need to add some Spring OAuth2 dependencies but i couldn't find it documented anywhere.

Swagger-codegen version

2.3.1

Start by reproducing the Maven generation with the shown swagger-codegen 2.3.1 configuration and OAuth2 security definition. Inspect target/generated-sources/src/main/java/io/swagger/configuration/ClientConfiguration.java and the generated imports that fail compilation. Done means the generated Spring client either compiles with its required dependencies or the required dependency setup is documented.