Could not autowire field RestTemplate in Spring boot application

Question

I am getting below exception while running spring boot application during start up   org springframework beans factory BeanCreationException  Error creating bean with name  testController   Injection of autowired dependencies failed  nested exception is org springframework beans factory BeanCreationException  Could not autowire field  private org springframework web client RestTemplate com micro test controller TestController restTemplate  nested exception is org springframework beans factory NoSuchBeanDefinitionException  No qualifying bean of type  org springframework web client RestTemplate  found for dependency  expected at least 1 bean which qualifies as autowire candidate for this dependency  Dependency annotations    org springframework beans factory annotation Autowired required true     I am autowiring RestTemplate in my TestController  I am using Maven for dependency managagement   TestMicroServiceApplication java  package com micro test  import org springframework boot SpringApplication  import org springframework boot autoconfigure SpringBootApplication    SpringBootApplication public class TestMicroServiceApplication        public static void main String   args            SpringApplication run TestMicroServiceApplication class  args             TestController java      package com micro test controller   import org springframework beans factory annotation Autowired  import org springframework http MediaType  import org springframework web bind annotation PathVariable  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RequestMethod  import org springframework web bind annotation RestController  import org springframework web client RestTemplate    RestController public class TestController         Autowired     private RestTemplate restTemplate        RequestMapping value   micro order  id            method RequestMethod GET          produces MediaType ALL VALUE      public String placeOrder  PathVariable  id   int customerId            System out println  Hit     gt  PlaceOrder             Object   customerJson   restTemplate getForObject  http   localhost 8080 micro customers   Object   class            System out println customerJson toString              return  false              POM xml       lt  xml version  1 0  encoding  UTF-8   gt   lt project xmlns  http   maven apache org POM 4 0 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xsi schemaLocation  http   maven apache org POM 4 0 0 http   maven apache org xsd maven-4 0 0 xsd  gt       lt modelVersion gt 4 0 0 lt  modelVersion gt        lt groupId gt com micro test lt  groupId gt       lt artifactId gt Test-MicroService lt  artifactId gt       lt version gt 0 0 1-SNAPSHOT lt  version gt       lt packaging gt jar lt  packaging gt        lt name gt Test-MicroService lt  name gt       lt description gt Demo project for Spring Boot lt  description gt        lt parent gt           lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-starter-parent lt  artifactId gt           lt version gt 1 3 3 RELEASE lt  version gt           lt relativePath  gt   lt  -- lookup parent from repository -- gt       lt  parent gt        lt properties gt           lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt           lt java version gt 1 8 lt  java version gt       lt  properties gt        lt dependencies gt           lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-web lt  artifactId gt           lt  dependency gt            lt dependency gt               lt groupId gt org springframework boot lt  groupId gt               lt artifactId gt spring-boot-starter-test lt  artifactId gt               lt scope gt test lt  scope gt           lt  dependency gt       lt  dependencies gt        lt build gt           lt plugins gt               lt plugin gt                   lt groupId gt org springframework boot lt  groupId gt                   lt artifactId gt spring-boot-maven-plugin lt  artifactId gt               lt  plugin gt           lt  plugins gt       lt  build gt     lt  project gt

User · Answer

You must add   Bean  public RestTemplate restTemplate RestTemplateBuilder builder   return builder build

User · Answer

you are trying to inject the restTemplate but you need to create configuration class    then there you need to create bean that return you new RestTemplate see the below example   import org springframework context annotation Bean  import org springframework context annotation Configuration     Configuration public class YourConfigClass          Bean     public RestTemplate restTesmplate             return new RestTemplate

User · Answer

Since RestTemplate instances often need to be customized before being used  Spring Boot does not provide any single auto-configured RestTemplate bean    RestTemplateBuilder offers proper way to configure and instantiate the rest template bean  for example for basic auth or interceptors    Bean public RestTemplate restTemplate RestTemplateBuilder builder        return builder                  basicAuthorization  user    name      Optional Basic auth example                  interceptors new MyCustomInterceptor       Optional Custom interceptors  etc                    build

User · Answer

If a TestRestTemplate is a valid option in your unit test  this documentation might be relevant  http   docs spring io spring-boot docs 1 4 1 RELEASE reference htmlsingle  boot-features-rest-templates-test-utility  Short answer  if using   SpringBootTest webEnvironment WebEnvironment RANDOM PORT    then  Autowired will work  If using        SpringBootTest webEnvironment WebEnvironment MOCK    then create a TestRestTemplate like this  private TestRestTemplate template   new TestRestTemplate

User · Answer

Error points directly that RestTemplate bean is not defined in context and it cannot load the beans    Define a bean for RestTemplate and then use it Use a new instance of the RestTemplate   If you are sure that the bean is defined for the RestTemplate then use the following to print the beans that are available in the context loaded by spring boot application  ApplicationContext ctx   SpringApplication run Application class  args   String   beanNames   ctx getBeanDefinitionNames    Arrays sort beanNames   for  String beanName   beanNames        System out println beanName       If this contains the bean by the name type given  then all good  Or else define a new bean and then use it

User · Answer

The simplest way I was able to achieve a similar feat to use the code below  reference   but I would suggest not to make API calls in controllers SOLID principles   Also autowiring this way is better optimsed than the traditional way of doing it   import org springframework beans factory annotation Autowired  import org springframework boot web client RestTemplateBuilder  import org springframework http MediaType  import org springframework web bind annotation PathVariable  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RequestMethod  import org springframework web bind annotation RestController  import org springframework web client RestTemplate    RestController public class TestController        private final RestTemplate restTemplate         Autowired     public TestController RestTemplateBuilder builder            this restTemplate   builder build                RequestMapping value   micro order  id    method  RequestMethod GET  produces  MediaType ALL VALUE      public String placeOrder  PathVariable  id   int customerId            System out println  Hit     gt  PlaceOrder             Object   customerJson   restTemplate getForObject  http   localhost 8080 micro customers   Object   class            System out println customerJson toString              return  false

User · Answer

Depending on what technologies you re using and what versions will influence how you define a RestTemplate in your  Configuration class   Spring    4 without Spring Boot  Simply define an  Bean    Bean public RestTemplate restTemplate         return new RestTemplate        Spring Boot  lt   1 3  No need to define one  Spring Boot automatically defines one for you   Spring Boot    1 4  Spring Boot no longer automatically defines a RestTemplate but instead defines a RestTemplateBuilder allowing you more control over the RestTemplate that gets created  You can inject the RestTemplateBuilder as an argument in your  Bean method to create a RestTemplate    Bean public RestTemplate restTemplate RestTemplateBuilder builder          Do any additional configuration here    return builder build        Using it in your class   Autowired private RestTemplate restTemplate    Reference

User · Answer

Please make sure two things   1- Use  Bean annotation with the method     Bean public RestTemplate restTemplate RestTemplateBuilder builder       return builder build        2- Scope of this method should be public not private    Complete Example -    Service public class MakeHttpsCallImpl implements MakeHttpsCall     Autowired private RestTemplate restTemplate    Override public String makeHttpsCall         return restTemplate getForObject  https   localhost 8085 onewayssl v1 test  String class       Bean public RestTemplate restTemplate RestTemplateBuilder builder       return builder build

User · Answer

It s exactly what the error says  You didn t create any RestTemplate bean  so it can t autowire any  If you need a RestTemplate you ll have to provide one  For example  add the following to TestMicroServiceApplication java    Bean public RestTemplate restTemplate         return new RestTemplate        Note  in earlier versions of the Spring cloud starter for Eureka  a RestTemplate bean was created for you  but this is no longer true

[spring] Could not autowire field:RestTemplate in Spring boot application

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