yanghao605 opened a new issue, #4749:
URL: https://github.com/apache/servicecomb-java-chassis/issues/4749
### Steps to reproduce (if applicable)
所使用开源软件为org.json:json版本号为20240303
定义一个Controller接口，返回类型为
```
class A {
String data;
JSONObject detail;
}
```
生成契约时报错空指针异常
Caused by: java.lang.IllegalStateException: Generate swagger operation
failed, method=TestController:test, cause=Cannot invoke
"io.swagger.v3.oas.models.media.Schema.get$ref()" because "result" is null
at
org.apache.servicecomb.swagger.generator.core.AbstractSwaggerGenerator.scanMethods(AbstractSwaggerGenerator.java:240)
at
org.apache.servicecomb.swagger.generator.core.AbstractSwaggerGenerator.generate(AbstractSwaggerGenerator.java:122)
at
org.apache.servicecomb.swagger.generator.SwaggerGenerator.generate(SwaggerGenerator.java:33)
at
org.apache.servicecomb.swagger.engine.SwaggerEnvironment.createProducer(SwaggerEnvironment.java:120)
at
org.apache.servicecomb.core.provider.producer.ProducerProviderManager.registerSchema(ProducerProviderManager.java:98)
at
org.apache.servicecomb.core.provider.producer.ProducerProviderManager.registerProducerMetas(ProducerProviderManager.java:87)
at
org.apache.servicecomb.core.provider.producer.ProducerProviderManager.init(ProducerProviderManager.java:73)
at org.apache.servicecomb.core.SCBEngine.doRun(SCBEngine.java:359)
### What have you tried so far?
_No response_
### Additional context
_No response_
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