Map<String, String> as request parameter in spring boot application

Question

I am migrating my spring boot application from 1.5.x to 2.3.x. After updating the required dependencies, in a controller having below method, getting one error:

@RequestMapping(value= "/test", method = RequestMethod.POST)
public ResponseEntity<MyResult> getTestRes(
                                       @RequestParam("test1") final String test1,
                                       @RequestParam("test2") final String test2,
                                       @RequestParam("test3") final String test3,
                                       @RequestParam Map<String, String> reqParam,
                                       final HttpServeletRequest req) throws Exception {

        //method body.....
}

When i try to build the application, i get below error:

[ERROR] Cant use non-primitive type: java.util.Map<java.lang.String, java.lang.String> as request parameter.

I am using Spring boot 2.3.9.RELEASE version with Spring framework 5.2.13.RELEASE.

Please let me know how can i resolve this issue.

Thanks

I think the error is clear: you can't use Map as a request parameter. — m0skit0
– m0skit0, Commented Jun 28, 2021 at 14:12
But it was working with old version and i dont see any changes regarding this kind of change in release notes. Please tell me what could be a possible fix for this error. — Dams
– Dams, Commented Jun 28, 2021 at 14:16
Are you sure you are getting the error during the Maven/Gradle build? Created minimal viable app here to replicate the issue, but build passed and even getting the response. Used spring-boot-starter-parent 2.3.9.RELEASE only. — sas
– sas, Commented Jun 28, 2021 at 15:24
@sas...Yes, i am just trying mvn clean install. Thanks for your effort in replication. Actually same code was working with Spring boot 1.5.1.Release but i really have no idea why its not working with 2.3.9.Release. — Dams
– Dams, Commented Jun 28, 2021 at 17:36
You can have an object to gather all your request parameters but I'm not sure if mixing is allowed. — LMC
– LMC, Commented Jun 28, 2021 at 21:30

Juliyanage Silva · Accepted Answer · 2021-06-28 14:32:55Z

0

Since you are using POST, I suggest you to do something like:

@RequestMapping(value = "/deleteData",method = RequestMethod.POST,consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Result getTestRes(@RequestBody HashMap<String, Object> dataHashMap) {
Object1 object1=  (Object1) JsonConvertor.jsonToObject((String) dataHashMap.get("object1"), Object1.class);
    Object2 object2= (Object2) JsonConvertor.jsonToObject((String) dataHashMap.get("object2"), Object2.class);   
}

Somthing like above should work. BUT if not you can have a wrapper object and pass that hashmap as key value string from client and then parse in in Java to a hashmap.

answered Jun 28, 2021 at 14:32

Juliyanage Silva

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1 Comment

Dams Over a year ago

I guess this is the solution if nothing works. But i really wants to know the root cause. At least some change notes in the subsequent spring boot releases.

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