jhipster/generator-jhipster

Hi,

This is my jhipster conifg (actuall kotlin hipster).

<details>
<summary>.yo-rc.json file</summary>
<pre>
{
  "generator-jhipster": {
    "promptValues": {
      "packageName": "com.test.test",
      "nativeLanguage": "en"
    },
    "jhipsterVersion": "6.10.4",
    "applicationType": "monolith",
    "baseName": "ProjectShoesBackend",
    "packageName": "com.test.test",
    "packageFolder": "com/test/test",
    "serverPort": "8080",
    "authenticationType": "jwt",
    "cacheProvider": "ehcache",
    "enableHibernateCache": true,
    "websocket": false,
    "databaseType": "sql",
    "devDatabaseType": "h2Disk",
    "prodDatabaseType": "postgresql",
    "searchEngine": false,
    "messageBroker": false,
    "serviceDiscoveryType": false,
    "buildTool": "gradle",
    "enableSwaggerCodegen": false,
    "jwtSecretKey": "YourJWTSecretKeyWasReplacedByThisMeaninglessTextByTheJHipsterInfoCommandForObviousSecurityReasons",
    "embeddableLaunchScript": false,
    "useSass": true,
    "clientPackageManager": "npm",
    "clientFramework": "angularX",
    "clientTheme": "minty",
    "clientThemeVariant": "dark",
    "creationTimestamp": 1606397893626,
    "testFrameworks": [],
    "jhiPrefix": "jhi",
    "entitySuffix": "",
    "dtoSuffix": "DTO",
    "otherModules": [
      {
        "name": "generator-jhipster-kotlin",
        "version": "1.10.0"
      }
    ],
    "enableTranslation": true,
    "nativeLanguage": "en",
    "languages": ["en"],
    "blueprints": [
      {
        "name": "generator-jhipster-kotlin",
        "version": "1.10.0"
      }
    ],
    "herokuAppName": "project-shoes-backend",
    "herokuDeployType": "git",
    "herokuJavaVersion": "1.8"
  }
}

</pre>
</details>


##### **JDL for the Entity configuration(s) `entityName.json` files generated in the `.jhipster` directory**

<details>
<summary>JDL entity definitions</summary>

<pre>
entity Brand {
  name String
}
entity Shoes {
  name String
}
entity Size {
  lengthInCm Long,
  sizeUS Long,
  sizeEU Long
}
relationship OneToMany {
  Brand{shoe} to Shoes{brand},
  Shoes{sizes} to Size{shoe}
}


</pre>
</details>


##### **Environment and Tools**

openjdk version "1.8.0_272"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_272-b10)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.272-b10, mixed mode)

git version 2.24.3 (Apple Git-128)

node: v14.9.0

npm: 6.14.7

Docker version 19.03.13, build 4484c46d9d

docker-compose version 1.27.4, build 40524192

identical .jhipster/Brand.json
identical .jhipster/Shoes.json
identical .jhipster/Size.json

I have a problem creating entities via the Angular frontend. When creating a Brand entity, it works. But when I try to create a Shoe Entity and link it with a Brand I always recieve a bad request error.

The log shows the following error message:

JSON parse error: Parameter specified as non-null is null: method com.test.test.domain.Brand.setShoes, parameter <set-?>; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Parameter specified as non-null is null: method com.test.test.domain.Brand.setShoes, parameter <set-?>
 at [Source: (PushbackInputStream); line: 1, column: 63] (through reference chain: com.test.test.domain.Shoes["brand"]->com.test.test.domain.Brand["shoes"])]

Can somebody help me figure out the problem?

Thanks in advance