It shows:

Request Mapping can not be resolved to a type.

CodePudding user response：

In Eclipse IDE sometimes this error comes while using Java 1.8. To resolve this error you have to perform 2 actions:-

1. Modify Build Path:- The tools.jar file in the lib folder of Java1.8 needs be to added as additional JARs. See steps here. Go to Project => Properties => Java Build Path => Libraries => JRE System Libraries => Edit. Click Alternative JRE => Installed JREs => click on jre1.8 => Edit. In Edit JRE windows, add extranal JAR "tools.jar" from the JDK installation path => Apply and close.
2. Modify Project Facets:- Go to Project => Properties => Project Facets => Adjust the Java version => Click on Apply.

CodePudding user response：

You should define HTTP method type, Get, post, put etc. As below

@RequestMapping(value = "/hello", method = RequestMethod.GET)