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How-to articles, tricks, and solutions about SPRING

How to POST form data with Spring RestTemplate?

To POST form data with the RestTemplate class in Spring, you can use the postForObject method and pass it a URL, an object containing the form data, and the response type.

java spring rest resttemplate

How to respond with an HTTP 400 error in a Spring MVC @ResponseBody method returning String

To respond with an HTTP 400 error in a Spring MVC controller method that returns a String, you can throw a ResponseStatusException with a status of BAD_REQUEST.

java spring spring-mvc http-error

How to solve the “failed to lazily initialize a collection of role” Hibernate exception

The "failed to lazily initialize a collection of role" exception in Hibernate is thrown when you try to access an uninitialized collection from a Hibernate entity when the entity is in a detached state.

java spring hibernate spring-mvc jsp

intellij incorrectly saying no beans of type found for autowired repository

If IntelliJ is saying "No beans of type 'X' found for autowiring" for a repository that you are trying to autowire, it means that the Spring application context does not contain a bean of the specified type.

java spring intellij-idea annotations autowired

Only using @JsonIgnore during serialization, but not deserialization

If you want to use the @JsonIgnore annotation to ignore a field during serialization but not during deserialization, you can use the @JsonIgnoreProperties annotation and set its writeOnly property to true.

json java spring jackson annotations

POST request via RestTemplate in JSON

To make a POST request with the RestTemplate in JSON, you can use the postForObject() method and pass it the URL of the request, the request body, the response type, and the HttpEntity object that represents the request headers and body.

json java spring rest resttemplate

Redirect to an external URL from controller action in Spring MVC

To redirect to an external URL from a controller action in Spring MVC, you can use the RedirectView class and return it from the controller action.

java spring spring-mvc jsp

Setting active profile and config location from command line in spring boot

To set the active profile and the configuration location from the command line in Spring Boot, you can use the spring.profiles.active and spring.config.name properties.

java spring spring-boot yaml

Spring Boot - Error creating bean with name 'dataSource' defined in class path resource

The error "Error creating bean with name 'dataSource' defined in class path resource" in Spring Boot typically indicates that there is a problem with the configuration of the dataSource bean.

java spring spring-boot database-connectivity

Spring Boot - How to log all requests and responses with exceptions in single place?

In a Spring Boot application, you can log all requests and responses, along with exceptions, in a single place by using a combination of Spring Boot's logging framework and request/response interceptors.

java spring logging spring-rest