<dateLibrary>java8</dateLibrary> is ignored

Description

using

java8

has no effect at all. the code generated always uses org.threeten.bp.OffsetDateTime.

Swagger-codegen version

2.4.13

Command line used for generation

`


reference-data

						<goals>
							<goal>generate</goal>
						</goals>
						 
						 
						 <!-- <configHelp>true</configHelp>
						 https://github.com/swagger-api/swagger-codegen/tree/master/modules/swagger-codegen-maven-plugin
						  -->
						<configuration>
							<inputSpec>${project.basedir}/src/main/resources/swagger/reference-data-api-2020-04-16.yaml</inputSpec>
							<language>java</language>
			                <configOptions>
			                    <dateLibrary>java8</dateLibrary>
			                </configOptions>
							<generateApis>false</generateApis>
							
													
							<generateModels>true</generateModels>
							<modelPackage>com.eurocontrol.safire.migrationtool.rest.model.referencedata3</modelPackage>
							<generateModelTests>false</generateModelTests>
							<generateModelDocumentation>false</generateModelDocumentation>
							<generateSupportingFiles>false</generateSupportingFiles>
							
							<configOptions>
								<sourceFolder>src/gen/java/main</sourceFolder>
							</configOptions>
						</configuration>
					</execution>

`

No matter what I use and how many options from true I set inside , it always uses org.threeten.bp.OffsetDateTime.

is this option really working?

Start by reproducing the Maven plugin execution and input spec path shown in the issue, then trace how configOptions reaches the Java generator's dateLibrary setting. Done means the java8 option changes generated model date types instead of producing org.threeten.bp.OffsetDateTime; check for an existing generator test covering this configuration.