message.Welcome to the Spring Boot learning workspace.
java/util/Mapput8(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;homePage/userLab/users.htmlaopLab /aop.html!eventLab#/events.html%learnApi'/learn)app +,-./+com/example/demo/controller/LearnControllerappNameLjava/lang/String;1EUse this endpoint family to compare common Spring MVC input patterns.3
learningGoals5java/lang/String7^Understand how query parameters, path variables, headers, cookies, and JSON bodies are mapped.91Compare normal responses with handled exceptions.;MConnect the browser, controller method signature, and serialized JSON output.= endpoints?#GET /learn/params?name=alex&age=18APOST /learn/bodyCGET /learn/path/{id}EGET /learn/headerGGET /learn/cookieIGET /learn/exceptionKPOST /api/auth/loginMGET /api/secure/meOpatternQ
@RequestParamSnameUageWtipYJQuery parameters are useful for filters, pagination, and optional toggles.[@RequestBody]received_PJSON request bodies fit create and update flows where the payload has structure.a
@PathVariablecideUPath variables usually identify a concrete resource such as a user, order, or lesson.g@RequestHeaderi userAgentkCHeaders often carry auth context, tracing ids, and client metadata.m@CookieValueo sessionIdqTCookies help explain browser session state and why a request may look authenticated.sjava/lang/RuntimeExceptionu0Intentional demo exception from /learn/exception
rwx(Ljava/lang/String;)Vz@ExceptionHandler|error
r~<00>
getMessage()Ljava/lang/String;<00>`Spring can convert thrown exceptions into structured API responses without leaking stack traces.RuntimeVisibleAnnotations4Lorg/springframework/beans/factory/annotation/Value;value${spring.application.name:demo}CodeLineNumberTableLocalVariableTablethis-Lcom/example/demo/controller/LearnController;root()Ljava/util/Map;infoLjava/util/Map;LocalVariableTypeTable5Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>; Signature7()Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;4Lorg/springframework/web/bind/annotation/GetMapping;/learn/rootparams6(Ljava/lang/String;Ljava/lang/Integer;)Ljava/util/Map;Ljava/lang/Integer;resultMethodParameters\(Ljava/lang/String;Ljava/lang/Integer;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;
/learn/params"RuntimeVisibleParameterAnnotations6Lorg/springframework/web/bind/annotation/RequestParam;requireddefaultValueguest0body (Ljava/util/Map;)Ljava/util/Map;datal(Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;5Lorg/springframework/web/bind/annotation/PostMapping;/learn/body5Lorg/springframework/web/bind/annotation/RequestBody;path#(Ljava/lang/String;)Ljava/util/Map;I(Ljava/lang/String;)Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;/learn/path/{id}6Lorg/springframework/web/bind/annotation/PathVariable;header
/learn/header7Lorg/springframework/web/bind/annotation/RequestHeader;
