本文解决方法转载自：
: .()
详细报错：
: .()
at .getConstructor0(Unknown Source) ~[na:1.8.0_66]
at (Unknown Source) ~[na:1.8.0_66]
at (:216) ~[spring-web-5.1.:5.1.]
at (:84) ~[spring-webmvc-5.1.:5.1.]
at (:139) ~[spring-web-5.1.:5.1.]
at (:124) ~[spring-web-5.1.:5.1.]
at (:165) ~[spring-web-5.1.:5.1.]
at (:138) ~[spring-web-5.1.:5.1.]
at (:102) ~[spring-webmvc-5.1.:5.1.]
at (:895) ~[spring-webmvc-5.1.:5.1.]
at (:800) ~[spring-webmvc-5.1.:5.1.]
at (:87) ~[spring-webmvc-5.1.:5.1.]
at (:1038) ~[spring-webmvc-5.1.:5.1.]
at (:942) ~[spring-webmvc-5.1.:5.1.]
at (:998) ~[spring-webmvc-5.1.:5.1.]
at (:901) ~[spring-webmvc-5.1.:5.1.]
at (:660) ~[tomcat-embed-core-9.0.:9.0.12]
at (:875) ~[spring-webmvc-5.1.:5.1.]
at (:741) ~[tomcat-embed-core-9.0.:9.0.12]
at (:231) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:53) ~[tomcat-embed-websocket-9.0.:9.0.12]
at (:193) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:99) ~[spring-web-5.1.:5.1.]
at (:107) ~[spring-web-5.1.:5.1.]
at (:193) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:92) ~[spring-web-5.1.:5.1.]
at (:107) ~[spring-web-5.1.:5.1.]
at (:193) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:93) ~[spring-web-5.1.:5.1.]
at (:107) ~[spring-web-5.1.:5.1.]
at (:193) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:200) ~[spring-web-5.1.:5.1.]
at (:107) ~[spring-web-5.1.:5.1.]
at (:193) ~[tomcat-embed-core-9.0.:9.0.12]
at (:166) ~[tomcat-embed-core-9.0.:9.0.12]
at (:199) ~[tomcat-embed-core-9.0.:9.0.12]
at (:96) [tomcat-embed-core-9.0.:9.0.12]
at (:490) [tomcat-embed-core-9.0.:9.0.12]
at (:139) [tomcat-embed-core-9.0.:9.0.12]
at (:92) [tomcat-embed-core-9.0.:9.0.12]
at (:74) [tomcat-embed-core-9.0.:9.0.12]
at (:343) [tomcat-embed-core-9.0.:9.0.12]
at .http11.(:408) [tomcat-embed-core-9.0.:9.0.12]
at (:66) [tomcat-embed-core-9.0.:9.0.12]
at (:770)[tomcat−embed−core−9.0.:9.0.12](:770)[tomcat−embed−core−9.0.:9.0.12](:1415) [tomcat-embed-core-9.0.:9.0.12]
at (:49) [tomcat-embed-core-9.0.:9.0.12]
at (Unknown Source) [na:1.8.0_66]
at (UnknownSource)[na:1.8.066](UnknownSource)[na:1.8.066](:61) [tomcat-embed-core-9.0.:9.0.12]
at (Unknown Source) [na:1.8.0_66]
错误代码：
public Object insertRoleModul(List mIds,@RequestParam(value=“rId”,required=false)Integer rId){
/* 代码块 /
}
解决办法(在参数前加注解：@RequestParam(“xxxxx”))：
List 类型未加@RequestParam(value=“mIds”,required=true) 注解
public Object insertRoleModul(@RequestParam(value=“mIds”,required=true)List mIds,@RequestParam(value=“rId”,required=false)Integer rId){
/ 代码块 */
}