Not able to build generated java implementation for Json spec file

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

openapi-generator version

4.3.0

OpenAPI declaration file content or url

below is the code spec of the json file
below file content is just content of model.

PublicKeyDto: {
description: "Public Key",
properties: {
value: {
allowEmptyValue: false,
type: "string",
description: "value"
},
issuer: {
allowEmptyValue: false,
type: "string",
description: "issuer"
},
alg: {
allowEmptyValue: false,
type: "string",
description: "alg"
},
keys: {
items: {
$ref: "#/definitions/MapOfstringAndobject"
},
allowEmptyValue: false,
type: "array",
description: "keys"
}
},
title: "PublicKeyDto",
type: "object"
}
{
title: "MapOfstringAndobject",
additionalProperties: {
type: "object"
},
type: "object"
}

Command line used for generation

openapi-generator generate -i swagger.json -g java -o csp-java-bindings --package-name com.org.csp.openapi_client

Steps to reproduce

after generation try to build the implementation using mvn clean package .
below is the error trace.
Compilation failure
[ERROR] /dbc/sc-dbc2115/ngp/csp-python-bindings/src/main/java/org/openapitools/client/model/PublicKeyDto.java:[130,18] error: incompatible types: ArrayList<Map> cannot be converted to List<Map<String,Object>>
in the implementation of PublicKeyDto.java following assignment is happening which is not correct according to java syntax.

public PublicKeyDto addKeysItem(Map<String, Object> keysItem) {
if (this.keys == null) {
this.keys = new ArrayList<Map>();//in this line error is coming.
}
this.keys.add(keysItem);
return this;
}
this.keys is declared as private List<Map<String, Object>> keys = null;

Related issues/PRs

Suggest a fix

Reproduce with swagger.json using the documented openapi-generator command, then inspect the generated csp-java-bindings/src/main/java/org/openapitools/client/model/PublicKeyDto.java and its addKeysItem method. Compare the declared keys type with the generated initializer and run mvn clean package; done means the generated Java implementation compiles successfully.