[JavaSpring] Usage of Array-Type leads to syntax error in generated coding

Hi,

when generating based on yamls like this (simplified):

openapi: 3.0.1
info:
  title: Test for Array Issue
  description: Test for Array Issue
  version: 1.0.0
servers:
- url: /test/array/issue
paths:
  /array/issue:
    get:
      summary: Provoke Array Issue
      operationId: getProvokeArrayIssue
      responses:
        200:
          description: Ok
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorInformation'
components:
  schemas:
    MessageText:
      type: string
      description: Message Text
    Message:
      required:
        - text
      type: object
      properties:
        text:
          $ref: '#/components/schemas/MessageText'
      description: Message
    Messages:
      minItems: 1
      type: array
      description: Messages
      items:
        $ref: '#/components/schemas/Message'
    ErrorInformation:
      type: object
      required:
        - messages
      properties:
        messages:
          $ref: '#/components/schemas/Messages'
      description: Error Information

with maven plugin setting like

			<plugin>
				<groupId>io.swagger.codegen.v3</groupId>
				<artifactId>swagger-codegen-maven-plugin</artifactId>
				<version>3.0.30</version>
				<executions>
					<execution>
						<id>code-gen-swagger-test-array-isssue</id>
						<goals>
							<goal>generate</goal>
						</goals>
						<configuration>
							<addCompileSourceRoot>true</addCompileSourceRoot>
							<modelPackage>com.test.array.issue.model</modelPackage>
							<apiPackage>com.test.issue.api</apiPackage>
							<inputSpec>ArrayIssueTest.yaml</inputSpec>
							<generateApiTests>false</generateApiTests>
							<language>spring</language>
							<configOptions>
								<java8>true</java8>
								<fullJavaUtil>true</fullJavaUtil>
								<dateLibrary>java8</dateLibrary>
							</configOptions>
						</configuration>
					</execution>
				</executions>
			</plugin>

this leads to generated code like

...
public class Messages extends java.util.ArrayList<Message>  {
...

and

...
public class ErrorInformation   {
  @JsonProperty("messages")
  private Messages messages = new java.util.ArrayList<>();
...

where private Messages messages = new java.util.ArrayList<>(); is syntactically not correct.

Please have a look.

Thanks in advance,
Andreas

Reproduce the issue with the supplied OpenAPI YAML and swagger-codegen-maven-plugin configuration using the spring language. Start by tracing the generator templates or entry points responsible for array model declarations and properties. Done means the generated ErrorInformation and Messages Java classes are syntactically valid and compile.