解决——》java.lang.IllegalArgumentException: Body parameter 0 was null

1、操作
2、现象（错误信息）
3、原因
错误代码：
4、解决
1）方案一：@RequestBody(required=false)
2）方案二：传参数时限制authSession不能为空
ody parameter 0 was null)
1、操作
调用controller时

2、现象（错误信息）
java.lang.IllegalArgumentException: Body parameter 0 was null

3、原因
SpringMVC方法中的@requestbody注解接收数据时，当参数为null时就报这个错""

错误代码:

@PostMapping(value = "/getCommunitiyFenceList")
public List<CommunityFenceRes> getCommunitiyFenceList(@RequestBody SearchCommunity search){
    //其它代码
}

4、解决
@RequestBody的required默认值是true，也就是说参数不能为null

1）方案一：@RequestBody(required=false)

@PostMapping(value = "/getCommunitiyFenceList")
public List<CommunityFenceRes> getCommunitiyFenceList(@RequestBody(required=false) SearchCommunity search){
    //其它代码
}

2）方案二：传参数时限制authSession不能为空
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原文链接：https://blog.csdn.net/weixin_43453386/article/details/88913809

Feign场景，则必须new一个值

java.lang.IllegalArgumentException: Body parameter 0 was null
    at feign.Util.checkArgument(Util.java:102) ~[feign-core-9.4.0.jar:na]
    at feign.ReflectiveFeign$BuildEncodedTemplateFromArgs.resolve(ReflectiveFeign.java:348) ~[feign-core-9.4.0.jar:na]
    at feign.ReflectiveFeign$BuildTemplateByResolvingArgs.create(ReflectiveFeign.java:213) ~[feign-core-9.4.0.jar:na]
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:72) ~[feign-core-9.4.0.jar:na]
    at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.4.0.jar:na]
    at com.sun.proxy.$Proxy77.umpDetails(Unknown Source) ~[na:na]
    at com.omsserver.external.OmsAndUmpExternalService.findOmsAndUmpInfo(OmsAndUmpExternalService.java:31) ~[classes/:na]
    at com.omsserver.controller.OmsController.selectUmpAndOmsInfo(OmsController.java:42) ~[classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) ~[tomcat-embed-core-8.5.11.jar:8.5.11]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.5.11.jar:8.5.11]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[tomcat-embed-core-8.5