【报错】java.lang.IllegalArgumentException: Name for argument type [java.lang.String] not availabl

2022-04-14T15:04:21.578+08:00 ERROR  [XNIO-2 task-11] [io.undertow.request:80]   - UT005023: Exception handling request to /hiscsc/open 
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Name for argument type [java.lang.String] not availabl
e, and parameter name information not found in class file either.
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

代码段

  @PostMapping(value = "/open")
  @ResponseBody
  public String open(String str) {
    //screenReceiver.sendMessage(str);
    return  screenService.handleScreenMessage(str);
  }

没加@RequestParam(value=“str”)

改为

  @PostMapping(value = "/open")
  @ResponseBody
  public String open(@RequestParam(value="str") String str) {
    //screenReceiver.sendMessage(str);
    return  screenService.handleScreenMessage(str);
  }

最后

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