For the latest stable version, please use Spring Boot 3.4.0!

Mappings (mappings)

The mappings endpoint provides information about the application’s request mappings.

Retrieving the Mappings

To retrieve the mappings, make a GET request to /actuator/mappings, as shown in the following curl-based example:

$ curl 'http://localhost:40683/actuator/mappings' -i -X GET \
    -H 'accept-encoding: gzip' \
    -H 'user-agent: ReactorNetty/1.1.24' \
    -H 'accept: */*'

The resulting response is similar to the following:

HTTP/1.1 200 OK
Content-Type: application/vnd.spring-boot.actuator.v3+json
Transfer-Encoding: chunked
Date: Thu, 21 Nov 2024 10:52:09 GMT
Content-Length: 5342

{
  "contexts" : {
    "application" : {
      "mappings" : {
        "dispatcherServlets" : {
          "dispatcherServlet" : [ {
            "handler" : "Actuator root web endpoint",
            "predicate" : "{GET [/actuator], produces [application/vnd.spring-boot.actuator.v3+json || application/vnd.spring-boot.actuator.v2+json || application/json]}",
            "details" : {
              "handlerMethod" : {
                "className" : "org.springframework.boot.actuate.endpoint.web.servlet.WebMvcEndpointHandlerMapping.WebMvcLinksHandler",
                "name" : "links",
                "descriptor" : "(Ljakarta/servlet/http/HttpServletRequest;Ljakarta/servlet/http/HttpServletResponse;)Ljava/util/Map;"
              },
              "requestMappingConditions" : {
                "consumes" : [ ],
                "headers" : [ ],
                "methods" : [ "GET" ],
                "params" : [ ],
                "patterns" : [ "/actuator" ],
                "produces" : [ {
                  "mediaType" : "application/vnd.spring-boot.actuator.v3+json",
                  "negated" : false
                }, {
                  "mediaType" : "application/vnd.spring-boot.actuator.v2+json",
                  "negated" : false
                }, {
                  "mediaType" : "application/json",
                  "negated" : false
                } ]
              }
            }
          }, {
            "handler" : "Actuator web endpoint 'mappings'",
            "predicate" : "{GET [/actuator/mappings], produces [application/vnd.spring-boot.actuator.v3+json || application/vnd.spring-boot.actuator.v2+json || application/json]}",
            "details" : {
              "handlerMethod" : {
                "className" : "org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping.OperationHandler",
                "name" : "handle",
                "descriptor" : "(Ljakarta/servlet/http/HttpServletRequest;Ljava/util/Map;)Ljava/lang/Object;"
              },
              "requestMappingConditions" : {
                "consumes" : [ ],
                "headers" : [ ],
                "methods" : [ "GET" ],
                "params" : [ ],
                "patterns" : [ "/actuator/mappings" ],
                "produces" : [ {
                  "mediaType" : "application/vnd.spring-boot.actuator.v3+json",
                  "negated" : false
                }, {
                  "mediaType" : "application/vnd.spring-boot.actuator.v2+json",
                  "negated" : false
                }, {
                  "mediaType" : "application/json",
                  "negated" : false
                } ]
              }
            }
          }, {
            "handler" : "org.springframework.boot.actuate.autoconfigure.endpoint.web.documentation.MappingsEndpointServletDocumentationTests$ExampleController#example()",
            "predicate" : "{POST [/], params [a!=alpha], headers [X-Custom=Foo], consumes [application/json || !application/xml], produces [text/plain]}",
            "details" : {
              "handlerMethod" : {
                "className" : "org.springframework.boot.actuate.autoconfigure.endpoint.web.documentation.MappingsEndpointServletDocumentationTests.ExampleController",
                "name" : "example",
                "descriptor" : "()Ljava/lang/String;"
              },
              "requestMappingConditions" : {
                "consumes" : [ {
                  "mediaType" : "application/json",
                  "negated" : false
                }, {
                  "mediaType" : "application/xml",
                  "negated" : true
                } ],
                "headers" : [ {
                  "name" : "X-Custom",
                  "value" : "Foo",
                  "negated" : false
                } ],
                "methods" : [ "POST" ],
                "params" : [ {
                  "name" : "a",
                  "value" : "alpha",
                  "negated" : true
                } ],
                "patterns" : [ "/" ],
                "produces" : [ {
                  "mediaType" : "text/plain",
                  "negated" : false
                } ]
              }
            }
          }, {
            "handler" : "ResourceHttpRequestHandler [classpath [META-INF/resources/webjars/]]",
            "predicate" : "/webjars/**"
          }, {
            "handler" : "ResourceHttpRequestHandler [classpath [META-INF/resources/], classpath [resources/], classpath [static/], classpath [public/], ServletContext [/]]",
            "predicate" : "/**"
          } ]
        },
        "servletFilters" : [ {
          "servletNameMappings" : [ ],
          "urlPatternMappings" : [ "/*" ],
          "name" : "requestContextFilter",
          "className" : "org.springframework.boot.web.servlet.filter.OrderedRequestContextFilter"
        }, {
          "servletNameMappings" : [ ],
          "urlPatternMappings" : [ "/*" ],
          "name" : "formContentFilter",
          "className" : "org.springframework.boot.web.servlet.filter.OrderedFormContentFilter"
        } ],
        "servlets" : [ {
          "mappings" : [ "/" ],
          "name" : "dispatcherServlet",
          "className" : "org.springframework.web.servlet.DispatcherServlet"
        } ]
      }
    }
  }
}

Response Structure

The response contains details of the application’s mappings. The items found in the response depend on the type of web application (reactive or Servlet-based). The following table describes the structure of the common elements of the response:

Path Type Description

contexts

Object

Application contexts keyed by id.

contexts.*.mappings

Object

Mappings in the context, keyed by mapping type.

contexts.*.mappings.dispatcherServlets

Object

Dispatcher servlet mappings, if any.

contexts.*.mappings.servletFilters

Array

Servlet filter mappings, if any.

contexts.*.mappings.servlets

Array

Servlet mappings, if any.

contexts.*.mappings.dispatcherHandlers

Object

Dispatcher handler mappings, if any.

contexts.*.parentId

String

Id of the parent application context, if any.

The entries that may be found in contexts.*.mappings are described in the following sections.

Dispatcher Servlets Response Structure

When using Spring MVC, the response contains details of any DispatcherServlet request mappings beneath contexts.*.mappings.dispatcherServlets. The following table describes the structure of this section of the response:

Path Type Description

*

Array

Dispatcher servlet mappings, if any, keyed by dispatcher servlet bean name.

*.[].details

Object

Additional implementation-specific details about the mapping. Optional.

*.[].handler

String

Handler for the mapping.

*.[].predicate

String

Predicate for the mapping.

*.[].details.handlerMethod

Object

Details of the method, if any, that will handle requests to this mapping.

*.[].details.handlerMethod.className

Varies

Fully qualified name of the class of the method.

*.[].details.handlerMethod.name

Varies

Name of the method.

*.[].details.handlerMethod.descriptor

Varies

Descriptor of the method as specified in the Java Language Specification.

*.[].details.requestMappingConditions

Object

Details of the request mapping conditions.

*.[].details.requestMappingConditions.consumes

Varies

Details of the consumes condition

*.[].details.requestMappingConditions.consumes.[].mediaType

Varies

Consumed media type.

*.[].details.requestMappingConditions.consumes.[].negated

Varies

Whether the media type is negated.

*.[].details.requestMappingConditions.headers

Varies

Details of the headers condition.

*.[].details.requestMappingConditions.headers.[].name

Varies

Name of the header.

*.[].details.requestMappingConditions.headers.[].value

Varies

Required value of the header, if any.

*.[].details.requestMappingConditions.headers.[].negated

Varies

Whether the value is negated.

*.[].details.requestMappingConditions.methods

Varies

HTTP methods that are handled.

*.[].details.requestMappingConditions.params

Varies

Details of the params condition.

*.[].details.requestMappingConditions.params.[].name

Varies

Name of the parameter.

*.[].details.requestMappingConditions.params.[].value

Varies

Required value of the parameter, if any.

*.[].details.requestMappingConditions.params.[].negated

Varies

Whether the value is negated.

*.[].details.requestMappingConditions.patterns

Varies

Patterns identifying the paths handled by the mapping.

*.[].details.requestMappingConditions.produces

Varies

Details of the produces condition.

*.[].details.requestMappingConditions.produces.[].mediaType

Varies

Produced media type.

*.[].details.requestMappingConditions.produces.[].negated

Varies

Whether the media type is negated.

Servlets Response Structure

When using the Servlet stack, the response contains details of any Servlet mappings beneath contexts.*.mappings.servlets. The following table describes the structure of this section of the response:

Path Type Description

[].mappings

Array

Mappings of the servlet.

[].name

String

Name of the servlet.

[].className

String

Class name of the servlet

Servlet Filters Response Structure

When using the Servlet stack, the response contains details of any Filter mappings beneath contexts.*.mappings.servletFilters. The following table describes the structure of this section of the response:

Path Type Description

[].servletNameMappings

Array

Names of the servlets to which the filter is mapped.

[].urlPatternMappings

Array

URL pattern to which the filter is mapped.

[].name

String

Name of the filter.

[].className

String

Class name of the filter

Dispatcher Handlers Response Structure

When using Spring WebFlux, the response contains details of any DispatcherHandler request mappings beneath contexts.*.mappings.dispatcherHandlers. The following table describes the structure of this section of the response:

Path Type Description

*

Array

Dispatcher handler mappings, if any, keyed by dispatcher handler bean name.

*.[].details

Object

Additional implementation-specific details about the mapping. Optional.

*.[].handler

String

Handler for the mapping.

*.[].predicate

String

Predicate for the mapping.

*.[].details.requestMappingConditions

Object

Details of the request mapping conditions.

*.[].details.requestMappingConditions.consumes

Varies

Details of the consumes condition

*.[].details.requestMappingConditions.consumes.[].mediaType

Varies

Consumed media type.

*.[].details.requestMappingConditions.consumes.[].negated

Varies

Whether the media type is negated.

*.[].details.requestMappingConditions.headers

Varies

Details of the headers condition.

*.[].details.requestMappingConditions.headers.[].name

Varies

Name of the header.

*.[].details.requestMappingConditions.headers.[].value

Varies

Required value of the header, if any.

*.[].details.requestMappingConditions.headers.[].negated

Varies

Whether the value is negated.

*.[].details.requestMappingConditions.methods

Varies

HTTP methods that are handled.

*.[].details.requestMappingConditions.params

Varies

Details of the params condition.

*.[].details.requestMappingConditions.params.[].name

Varies

Name of the parameter.

*.[].details.requestMappingConditions.params.[].value

Varies

Required value of the parameter, if any.

*.[].details.requestMappingConditions.params.[].negated

Varies

Whether the value is negated.

*.[].details.requestMappingConditions.patterns

Varies

Patterns identifying the paths handled by the mapping.

*.[].details.requestMappingConditions.produces

Varies

Details of the produces condition.

*.[].details.requestMappingConditions.produces.[].mediaType

Varies

Produced media type.

*.[].details.requestMappingConditions.produces.[].negated

Varies

Whether the media type is negated.

*.[].details.handlerMethod

Object

Details of the method, if any, that will handle requests to this mapping.

*.[].details.handlerMethod.className

String

Fully qualified name of the class of the method.

*.[].details.handlerMethod.name

String

Name of the method.

*.[].details.handlerMethod.descriptor

String

Descriptor of the method as specified in the Java Language Specification.

*.[].details.handlerFunction

Object

Details of the function, if any, that will handle requests to this mapping.

*.[].details.handlerFunction.className

String

Fully qualified name of the class of the function.