Created by: kevchentw
fix #10848
Before the fix Hashmap is not imported causing error when set generateAliasAsModel=true After the fix, Hashmap will be imported.
not sure if this is the best way to fix it. But jesery client also uses the same method. https://github.com/openapitools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/Java/libraries/jersey2/model.mustache#L21-L22
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