[BUG] [Java] uppercase property leads to duplicate fields after serialization

[zhangyangyu]

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?
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Description

My model get a field called OS-EXT-SRV-ATTR which generate code like:

  @JsonProperty("OS-EXT-SRV-ATTR")
  private ExtServerAttr OS_EXT_SRV_ATTR; 
  /**
   * Get OS_EXT_SRV_ATTR
   * @return OS_EXT_SRV_ATTR
  */
  @ApiModelProperty(value = "")
  @Valid
  public ExtServerAttr getOSEXTSRVATTR() {
    return OS_EXT_SRV_ATTR;
  }

  public void setOSEXTSRVATTR(ExtServerAttr OS_EXT_SRV_ATTR) {
    this.OS_EXT_SRV_ATTR = OS_EXT_SRV_ATTR;
  }

After serialize with jackson we will get two fields in the result: OS_EXT_SRV_ATTR and osextsrvattr. This is a expected behaviour for jackson, see FasterXML/jackson-databind#1609 . But it's definitely not ideal for my app.

openapi-generator version

I use openapi-generator-maven-plugin 3.3.4, but I tried the latest 4.2.3, no help.

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix

I think the idea behaviour is to seriliaze the field as-is in the yaml model declaration.

[stefanfrings2]

I have the same issue using openapi-generator-maven-plugin 5.1.1.
My *.yaml file specifies a response format that contains properties for counters with names like VALID and INVALID. The ObjectMapper duplicates each of them in the resulting JSON document: { "valid":2, "invalid":3, "VALID":2, "INVALID":3}

[stefanfrings2]

Great, thank you!