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Have looked at other related posts but nothing seemed to work.

Basically I'm trying to figure out how to pass data to my restful spring-boot app.

Here is the curl command I'm using:

$ curl -iX POST -H 'Content-Type: application/json' -d @args.json http://localhost:8080/myapp/dummyApi

With args.json contains:

file: args.json:

{ "arg1": "hello", "arg2": 10, "arg3": { "a": "1", "b": "2" } }

The api is defined in MyController.java as such:

file: MyController.java

@RestController @RequestMapping("/myapp") public class MyController { //... static class DummyRet { private String foo; public DummyRet(String f) { foo = f; } public String getFoo() { return foo; } public void setFoo(String foo) { this.foo = foo; } } @RequestMapping(value="/dummyApi", method=RequestMethod.POST) public DummyRet dummyApi(@RequestParam(value = "arg1", required = false, defaultValue = "") String arg1, @RequestParam(value = "arg2", required = false, defaultValue = "") Long arg2, @RequestParam(value = "arg3", required = false) Map<String, String> arg3) { LOGGER.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); LOGGER.info("Arguments received:"); LOGGER.info("arg1: " + arg1); LOGGER.info("arg2: " + arg2); LOGGER.info("arg3: " + arg3); LOGGER.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); return new DummyRet("foo"); } //... }

The return of the curl command is 200 success (since non of the arguments is required) but the values of args are not reaching over to dummyApi method

$ curl -iX POST -H 'Content-Type: application/json' -d @args.json http://localhost:8080/myapp/dummyApi HTTP/1.1 200 Content-Type: application/json;charset=UTF-8 Transfer-Encoding: chunked Date: Sun, 04 Jun 2017 15:37:42 GMT {"foo":"foo"}

The server console looks like this:

2017-06-04 18:17:56.818 DEBUG 32258 --- [nio-8080-exec-7] o.s.web.servlet.DispatcherServlet : DispatcherServlet with name 'dispatcherServlet' processing POST request for [/myapp/dummyApi] 2017-06-04 18:17:56.818 DEBUG 32258 --- [nio-8080-exec-7] s.w.s.m.m.a.RequestMappingHandlerMapping : Looking up handler method for path /myapp/dummyApi 2017-06-04 18:17:56.818 DEBUG 32258 --- [nio-8080-exec-7] s.w.s.m.m.a.RequestMappingHandlerMapping : Returning handler method [public com.xx.controllers.MyController$DummyRet com.xx.controllers.MyController.dummyApi(java.lang.String,java.lang.Long,java.util.Map<java.lang.String, java.lang.String>)] 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : Arguments received: 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : arg1: 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : arg2: null 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : arg3: null 2017-06-04 18:17:56.819 INFO 32258 --- [nio-8080-exec-7] c.p.controllers.MyController : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 2017-06-04 18:17:56.819 DEBUG 32258 --- [nio-8080-exec-7] m.m.a.RequestResponseBodyMethodProcessor : Written [com.xx.controllers.MyController$DummyRet@c35d46f] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@301ec38b] 2017-06-04 18:17:56.819 DEBUG 32258 --- [nio-8080-exec-7] o.s.web.servlet.DispatcherServlet : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling 2017-06-04 18:17:56.819 DEBUG 32258 --- [nio-8080-exec-7] o.s.web.servlet.DispatcherServlet : Successfully completed request

I hope I haven't left out any of the important details, but please let me know if anything is missing.

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2 Answers 2

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2

This worked:

I had two issues in my spring-boot java method,

  1. I'm specifying @RrequestParam for the arguments, where I should be using @RequestBody instead
  2. I have multiple of such method params where in POST it should be a single (see footnote) @RequestBody

But since I need to pass multiple arguments over to the method the solution was to wrap these arguments in a backing object, as such:

public static class Args { // members private String arg1; private Long arg2; private Map<String, String> arg3; // accessors public String getArg1() {return arg1;} public void setArg1(String arg1) {this.arg1 = arg1;} public Long getArg2() {return arg2;} public void setArg2(Long arg2) {this.arg2 = arg2;} public Map<String, String> getArg3() {return arg3;} public void setArg3(Map<String, String> arg3) {this.arg3 = arg3;} }

The receiver method would then be:

@RequestMapping(value="/dummyApi", method=RequestMethod.POST) public DummyRet dummyApi(@RequestBody Args args) { LOGGER.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); LOGGER.info("Arguments received:"); LOGGER.info("arg1: " + args.getArg1().toString()); LOGGER.info("arg2: " + args.getArg2().toString()); LOGGER.info("arg3: " + args.getArg3().toString()); LOGGER.info(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); return new DummyRet("foo"); }

Footnote: In fact it is possible to pass multiple params through custom implementation as described in this SO response. Haven't tried it

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Refer below sample,

curl -H "Content-Type: application/json" --data @body.json http://localhost:8080/ui/webapp/conf
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5 Comments

thanks for the suggestion but I still get the same behaviour as before
Can you try with chrome postman extension? If you are able to get response using any post client such as postman then curl should also work as it is a client. PostMan : chrome.google.com/webstore/detail/postman/…
sorry for the delay, just tried chrome postman, still getting same behaviour, to make sure I'm not using anything funny in my spring boot app I cloned spring-boot-tutorial. Only added code related to dummyApi
unfortunately no :(
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