[BUG] [Spring] [Java] Invalid code generated for schemas with oneOf object attributes

Created by: wagnerrobsan

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

When generating a spring or java code with a spec that contains an attribute with oneOf, the code generator creates a code with a bug

Spec: https://gist.github.com/wagnerrobsan/88d81d113d4add401667e64ab814e3aa

Creates the following java code:

public Fruit putBodyItem(String key,  bodyItem) {
    if (this.body == null) {
      this.body = ;
    }
    this.body.put(key, bodyItem);
    return this;
  }

openapi-generator version

latest version, build from master

OpenAPI declaration file content or url

Providing minimal reproducing example (YAML):

Spec: https://gist.github.com/wagnerrobsan/88d81d113d4add401667e64ab814e3aa

Generation Details

see Steps to reproduce for more details

Steps to reproduce

git clone https://github.com/openapitools/openapi-generator cd openapi-generator mvn clean package java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \ -i https://gist.githubusercontent.com/wagnerrobsan/88d81d113d4add401667e64ab814e3aa/raw/ab969d651c60e76be6b44ba69950c77b9992c108/openapi-oneOfbug.yaml \ -g spring \ -o /outputFolder/oneOfBugApiClient

Related issues/PRs

Related to

Suggest a fix

The code generator should skip in the mustache file the putBodyItem method creation. see file JavaSpring/pojo.mustache